PVDIS How To Page

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Note to expert: if you edit this file on your own PC, please make sure you copy the latest web version to start from. Other experts update this file frequently!.

Troubleshooting (note: link is working again)
In the production mode of this experiment, the PVDIS DAQ is a combination of the PVDIS electronics and the HAPPEX DAQ. The HAPPEX DAQ is used to readout data. Periodically, we also use the HRS data acquisition system for systematic studies.
HAPPEX/PVDIS Data Acquisition (Updated Nov 4, 2009)
HAPPEX Data Analysis (Updated 11/04/09)
- Starting Online Data Monitor
- Starting prompt analysis
Spectrometer
Target How to (updated 11/5/09)
- The generic (but not necessarily the latest) reference for all things target is
- Important Notice for PVDIS target
- Target Status for PVDIS
- Checking target temperature
- What to do if the target temperature drops fast?
- New procedure for target IOC reboot
- Alarms and Major Events
Spectrometer Data Acquisition
Spectrometer Data Analysis
- Online (Podd) analysis
Hall A Detectors (Updated [date])
Compton Polarimeter
- Compton Polarimeter Home page.
- Compton Data-Taking instructions.
- Compton Logbook (analysis results)
Helicity Controls
Miscellaneous
Other Problems
- If you can't solve a problem

HAPPEX/PVDIS Data Acquisition

HAPPEX DAQ cold start (up to date as of 10-28-09)

Note: This is for HAPPEX DAQ. If you want to cold start spectrometer DAQ see Spectrometer DAQ cold start.

Do the following at a shell prompt on adaql1 on the apar account. This does a kcoda, etc, for you:

> startcoda
The Runcontrol GUI will start up. Now click on the Connect button.
Wait 10 seconds, then click on Configure. A dialog box pops up and you must choose the configuration you want, which is presumably HAPPEX.

           List of Useful DAQ Configs 

 All these can be used for the experiment.  Ask the RC which is preferred at the moment.

   Pvdis -- Full config, all crates.
   PvdNoQweak -- Full config minus the Qweak crate (it's less important and may have crashed)

Wait for configuration to finish (see messages in text box at lower left), then click Download.
Wait for that to finish. Now you can click Start Run to start a run (see section on Running CODA).
In another workspace, open up xterms for monitoring the ROCs by starting the ROC IT GUI:

> roc_it
Click on OPEN ALL. An xterm should open for each IOC. If you are asked for a login name, use adaq as the user. The password is the same as in the counting house computers.

NOTE:

dithering

asymmetry charge feedback

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Turning Dithering on/off (up to date as of 9-23-09): dithering should be on throughout the PVDIS running.

Log in if necessary to adaql1 on the apar account
Bring up a greenmonster terminal by typing
> greenmonster
On the GreenMonster gui, click on BMW tab
To check the current dithering status, click on
> Check Status
If the dithering is turned on , then Beam Modulation is ON is displayed to the right of Check Status tab. The tab to the left of Check Status tab will appear as Set Kill Switch, with Kill Switch is OFF message displayed above it.
If the dithering is turned off , then Beam Modulation is OFF is displayed to the right of Check Status tab. Dithering can be turned back on by simply clicking
> Enable Modulation On
Ensure that the dithering is turned on by clicking
> Check Status
NOTE If reboot the parity daq crate (ROC 23, halladaq6, hatsv9 2004) you will need to restart dithering!

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Monitoring HAPPEX systems (up to date as of 9-23-09)

Log in if necessary to adaql1 on the apar account
To check status of feedback system and polarized source, type at shell prompt:

> runbird

Help is available using the Help button at the bottom. Settings and numbers to expect can be found in the White Bound Shift Worker Folder.
To set/check status of HAPPEX ADCs and timing boads, type at shell prompt:

> greenmonster

Click on tabs at top to examine ADCs in different crates or timing.

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Rebooting HAPPEX crates (up to date as of 11-09-09)

If a run is in progress, end it. If you can't end it, close the CODA GUI window.
There should be xterms open for each roc in the ROCS workspace. In the desired xterm, click ENTER a few times to check communication to the IOC. Then type:

> reboot
The IOC will then proceed through its booting sequence. It is ready when either of these messages appear (e.g. for ROC23/halladaq6):

"ROC23" state now "booted"
Done executing startup script /adaqfs/halla/apar/vxworks/halladaq6.boot
New ! (Nov 9, 2009) Power-Cycling the Injector Crates
- Necessary when ROC31 (aka g0inj) or ROC24 (aka happexinj) get hung up.
- Go to http://g0injreboot.acc.jlab.org and enter the user/password which are written on the "Passwords" sheet near the whiteboard.
- Click "Control Action" and select "Immediate Off", then click the "Apply" button.
- Wait a few seconds, then "Control Action" and "Immediate On" and "Apply".
In the runcontrol GUI,

click Abort
click Reset
click Download
Start a new run.

List of HAPPEX crates

HAPPEX crates
ROC	Description	Location	IP Address	Portserver
TS1	Trigger Supervisor	Counting Room	happex4	hatsv9 port 3
ROC23	CH Crate	Counting Room	halladaq6	hatsv9 port 4
ROC26	R-arm Detectors	R-HRS Det. Stack	happex7	hatsv10 port 5
ROC25	L-HRS Timing Board	L-HRS Det. Stack	hallavme14	hatsv40 port 5
ROC28	R-arm PVDIS	near R-HRS Fastbus	pvdis1	hatsv10 port 4
ROC29	L-arm PVDIS	near L-HRS Fastbus	pvdis2	hatsv4 port 5
ROC24	Happex Inj Crate	Injector Serv. Bldg.	halladaq19	hatsv18 port 4
ROC31	Qweak Injector Crate	Injector Serv. Bldg.	g0inj	hatsv18 port 5

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Running CODA for HAPPEX DAQ (up to date as of 9-23-09)

Note: This is for HAPPEX DAQ. If you want to run CODA for spectrometer DAQ see Running CODA for spectrometer DAQ.

Log in, if necessary, to adaql1 as user apar
The Runcontrol GUI may be already running. If not, see section HAPPEX DAQ cold start. To start and stop runs, click on the buttons Start Run and End Run. Start Run is the same as the sequence Prestart, Go.

Be sure to enable the online data monitor before starting the run, if you wish to use it during the run.
Start a new run EVERY hour, even with no beam. Runs without beam are important for Electronics Crosstalk Analysis.

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Switching CODA config between Pvdis and PvdNoQweak (up to date as of Nov 9, 09)

Pvdis

ROC 31

PvdNoQweak

ROC 31

Note: How to Power-Cycling the Injector Crates via http://g0injreboot.acc.jlab.org see Rebooting HAPPEX crates.
To switch the configuration (in case you cannot reboot ROC31 quickly):
In runControl, press Reset .
Click on Configuration tab, and select PvdNoQweak
Click on Download tab.
If later on, ROC 31 is rebooted, and we want to go back to Pvdis configuration, then follow the set of instructions outlined above replacing instances of PvdNoQweak with Pvdis .

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HAPPEX/PVDIS Data Analysis

Online Data Monitor (up to date as of 11-04-09). Click here for a one-page summary.

HAPPEX online data monitor (PANGUIN) normally starts up at start of run. To disable this "background process" enter at a shell prompt:

> panguin off

To re-enable it enter:

> panguin on

These commands have no immediate effect on analysis, but govern whether or not analysis will start at the start of the next run.
To monitor data online, log into adaql1 with the apar account and type at a shell prompt:

> gopan
> online -f pvdis
or

> gopan
> pan
> online("panguin/pvdis")

A fairly self-evident GUI will appear. Select various pages of plots using the buttons on the left.

NOTE: Please be warned that the GUI might crash for several reasons. Making it work again could simply be a matter of closing the window and restarting it. If at any point the GUI stops working and restarting does not work, then you you must do a HAPPEX/PVDIS DAQ cold start.

Compare histograms and strip charts of Online GUI with sample Prompt Analysis plots. Inform shift leader if there is any suspectible difference.
(to be updated) Here is a list of what shift workers should look at when monitoring online:
- There should be at least two BCMs in the 'BCMs 1-2 1D' tab with a healthy signal. A healthy signal can be characteized as being at or above 25,000 channels (except for BCM2, connected to an 18-bit ADC, which should be more than 150,000 channels).
- There should be at least four BCMs in the 'BCMs 1u,1d, L&R' tab with a healthy signal. A healthy signal can be characteized as being correlated with the beam current <- update this for PVDIS!
- In the 'BCM asymmetries' tab, the histograms shown should be centered at around zero and should agree with each other. Otherwise, Pockels Cell voltages might need to be adjusted so we can get them to zero.
- In the 'BCM asymmetry correlations' tab, the histograms shown should be a nice skinny diagonal distribution near zero in both axes. Otherwise, something is wrong with the BCM signals in the PVDIS crate. <- update this for PVDIS!
- The BPM12 wires tab shows 4 plots. The mean on all these plots will normally be about 85000 channels and should be less than 130,000 channels. If these signals saturate, it would be a disaster for the experiment! For detailed instructions of what to do when these signals saturate, click here.
  .

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Starting prompt analysis (up to date as of 11-04-09). Click here for a one-page summary.

The HAPPEX Prompt analysis is comparable to the Detector and Physics replay that is done with the Hall-A Analyzer.

Log into adaql5 or adaql6 with the apar account.
DO NOT PERFORM PROMPT ANALYSIS ON adaql1, adaql2 or adaql3!!!

Do NOT do prompt analysis for a run untile it has ENDED.
At the shell prompt, type:
> gopan
> prompt runnumber

Prompt Analysis will then proceed with decoding the raw CODA data into Helicity Correlated Asymmetries and Position Differences, done by the Parity ANalyzer (PAN). This is followed by the Regression and Dithering Analysis (REDANA), which corrects the raw asymmetries for detector sensitivities to beam parameters.

The Online GUI will open a window presenting histograms and stripcharts for the requested runnumber. Check these versus the sample Prompt Analysis plots (should be in a white bound folder). Any strange deviations from the sample plots should be brought to someone's attention (Shift Leader, Run Coordinator) and shown in the HALOG. The reference plots (need to be updated) are shown below:

changes to be made for PVDIS
Fig. 1 and 2 should have one of the
PVDIS bcm copies. Fig. 3 should have
(or another page should be added) for
the asymmetry of PVDIS bcm copies,
and their correlation with bcm1 or bcm2.
These 3 can stay the same
Fig. 7 and 8 should be replaced by PVDIS
signals. Suggest rate and asymmetries of:
e4n, e4w, e5n, e5w, pi4n, pi4w, pi5n, piw,
and the overall en, ew, pin, piw, for both
left and right arms.

If you start a prompt analysis before a run is finished, or for some reason you need to force the reanalysis of a run then use:
> gopan
> reprompt runnumber

Once in a while, print out the text output files and put them in the binder (taking advantage of the opportunity to look them over and compare them to previous runs, of course). The print command is (after doing $ gopan) e.g.
$ chaprint_text prompt_output/*_224*
to print outputs from runs 2240 to 2249.

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Spectrometer

Bringing up the Alarm Handler

In the HAC control window, press the "Alarm Handler" label in the tools launcher. When an alarm is triggered, the bottom "Alarm Handler" will flash, then you can press there to see where the problem is.

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Bringing up the HAC control window

The machine to run HAC is hacsbc2, the second machine from left. At the bottom of the screen is the Linux taskbar. The sixth symbol is tools launcher. Pressing the arrowhead opens a menu which has:

Alarm Handler, bogies_LEFT, bogies_RIGHT, bogies_SetSpec, JavaArchiverClient,

Menu_Accelerator, Menu_ESR, Menu_HallA, snapshot, StripTool

Pressing the "Menu_HallA" label launches a subscreen titled "Hall A Main Menu". One of the entries is labelled "Tools". Pressing on the "Tool" button opens the "Hall A General Tools" screen as follows, which is often referred to as the HAC window. The old version of HAC can be found at http://hallaweb.jlab.org/document/OPMAN/node179.html.

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Changing momentum setting of HRS <- should get updates from the techs on this for PVDIS

From the HAC control window, there is a P0 SET field for each spectrometer in which you can enter the desired momentum setting. To change to a lower momentum from a higher previous setting, you just need to enter the momentum value. To bring the momentum setting up, you need to recycle the magnets for Q2 and Q3 of either arm. That is increase the current of Q2/Q3 to 1600 A for the Left arm or 1400 for the Right arm, wait for 2 minutes after they reach max, then tune down the value to the desired setting. More detailed instructions are on the white board of the counting house. There's no need to recycle magnets for Q1 and Dipole.

Procedure to reset the dipole momenta (eg. after a reboot of the magnet controls IOC):

Look up (in the runsheets or the whiteboard) the desired SET current in the dipole magnet power supply.

Turn OFF the field regulator in the dipole nmr field control gui.

Set the desired momentum in the hall A tools screen (set the "P0").

Enter the desired SET current in the dipole magnet power supply.

Wait for the momentum setting of the dipole to reach within ~0.5% of the desired momentum.

Turn ON the field regulator.

Eventually, the regulator will automatically enter a new set current that will take the dipole directly to the desired momentum.
Note:

left dipole SET current ≁ (left dipole READ current)/(0.944)

right dipole SET current ≁ (right dipole READ current)/(1.005)

[This is a modified version of HAlog entry 129538].

Reset Q1 of Left or Right HRS <- should get updates from the techs on this for PVDIS

From the HAC control window

This is for Q1 recovery after it trips. Never use the following instruction if Q1 works fine.

Go to Hall A tools screen and press the blue button next to "I(A)" for left or right HRS (depending on which one is having problems). Click on "Q1 power supply", this will pop up the window for power supply control.

Usually after a trip, the Q1 current will drop to zero, some fault messages will show in red, and the power supply is off. Press the "Reset" button to clear the faults and wait, for an example see halog 152379. Note that "MAGNET MISMATCH" will remain on because the current readback does not match the set point.

Try to turn on the power supply by clicking on "POWER ON". If it does not turn itself on, try the following:

Go to the middle room, look for a "Reset switch box #1" in rack CH01B04, press the green button labeled "left Q1 local control reset" or "right Q1 local control reset";

Go back to the control window and click on "POWER ON" again. If it still does not turn itself on, a controlled access is needed. In this case, consult the run coordinator first, and then go down to the hall.

Go to Q1 power supply, put into local mode (a button).

Press "reset", then "power on", then press local mode button again to go into remote (its a 2-state button). This might suffice. Ask shift crew to turn on magnet... see if it works.

If this doesn't work, which happens all the time, then:

Go to the key panel on row of equipment behind Q1 PS (toward target), press yellow button under key switch.

And press tiny blue reset on back of this panel. There is a big sign pointing to this tiny button.

Repeat step 2.

Now the power supply should be on. If it is not, you didn't do the above procedure correctly. In the control window, enter set current. If a set current is already there, check if it is the same as previous runs (check the runsheets). Wait for the magnet to ramp up.

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Target How to

Target Important Notice:

For the safe operation of the cryotarget, whenever there is a major event (such as power outage, cryo (CHL/ESR) crash) which significantly affects the target operation, or there is an alarm you don't know how to deal with, or any situation you are not sure what to do, please call the target-on-call!

Target Status for PVDIS:

Loop 1 has LD2 target operating at 22K and 25 psi. Loop 2 and Loop 3 are not being used, filled with helium gas at the moment. PVDIS has the highest demand ever in beam power (over 100uA on 20-cm LD2 cell) and therefore the highest demand on cryogenical cooling power. Due to insufficient cooling power from the ESR 15K coolant, we are using 4K coolant directly from CHL. This significantly increases the chance of freezing the deuterium target which has a frozen point of 19K. Target operators should pay close attention to the temperature and high power heater status to prevent the target from freezing.

Checking target temperature (for PVDIS, loop 1, LD2 target should be at 22K)

The target temperature is displayed on the target charts running on poltarac as well as on the camera monitors on the shelves above the computers. Look at the camera monitor labeled "Control Rack", third top little monitor. It displays the temperatures for the three loops on three white temperature controllers, with loop 1 at the top and loop 3 on the bottom.
For PVDIS, the cryotarget is in loop 1, a 20-cm LD2 cell. It's temperature should be kept at 22K.

What to do if target temperature drops fast?

When you see the temperature drops significantly, it probably is an indication that we do not have enough heating power (either from beam or high power heater), which probably indicates that the PID control of high power heater is not working properly. In this case, you should use the local heater poper supply in the middle room (top one is for loop 1) to keep temperature from dropping too much.
If the local heat power supply also fails, you should reduce the coolant supply by closing down the J-T valve (at a rate of 2% per minute). Always be gentle when adjust J-T valve, too fast could cause cryo-crashing.
If you are not sure what to do, call the target-on-call.

Procedure on target IOC reboot

Before you start reboot ioc, you NEED to turn on and set the local auxiliary heater power in a rack in the middle room (top one is for loop 1). Set the voltage to be slightly lower than the value you are running the heater from PID control. THIS IS IMPORTANT to prevent target from freezing since when ioc comes back, the PID control will turn the remote heater power to zero.
Type "http://hareboot7" in a web browser and enter the username: hlauser and passwd (on the list posted on the wall next to the whiteboard)
Select "Immediate Reboot" under "Control Action" for outlet 5 and 6 (iocha13);
Click "Apply", wait for IOC to come back, and be patient. It takes a few minutes.
When ioc comes back. the remote heater power will start at zero, which is the time the local auxiliary heater kicks in to keep the target temperature from dropping too fast.
After the PID re-established the proper value for the remote heater power, it will take over automatically. You can turn off the local auxiliary heater power when the system becomes stable.
If the IOC stills behaves odd, call the target on-call.

Alarm and Major Events

Pay attention to alarms. Make sure you know what caused the alarms and take care of them. If you are not sure, please call the target-on-call.
For any major events (such as power outage, cryo (CHL/ESR) crash) which affects the target operation, please notify the targte-on-call immediately. Not notifying the target-on-call during these major events could result in target failure and major down time.

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Spectrometer Data Acquisition

Spectrometer DAQ cold start

Note: This is for spectrometer DAQ. If you want to cold start HAPPEX DAQ see HAPPEX DAQ cold start.

The spectrometer DAQs runs on the a-onl account. Right HRS runs on adaql2 and the Left HRS runs on adaql3.

Do the following at a shell prompt on adaql2 (adaql3) for the Right (Left) HRS DAQ on the a-onl account:

> startcoda

"startcoda" will run "kcoda", and will start all the components for you.

Run Type = LeftHRS or RightHRS.

Details about Hall A Spectrometer DAQ and trigger see Bob Michaels's guide.html and guide2.html.

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Mapping of ROCs to Portserver and IP for Spectr. DAQ

        HRS-DAQ CODA Configrations 

        LeftHRS        Left spectrometer DAQ       on adaql3
        RightHRS       Right spectrometer DAQ      on adaql2

HRS-DAQ crates
ROC	Description	IP Address	Portserver
ROC1	R-arm Lower Fastbus Crate	hallasfi1	hatsv3 port 2
ROC2	R-arm Upper Fastbus Crate	hallasfi2	hatsv3 port 8
TS0	R-arm VME/Scaler	hallavme2	hatsv3 port 3
ROC3	L-arm Lower Fastbus Crate	hallasfi3	hatsv4 port 3
ROC4	L-arm Upper Fastbus Crate	hallasfi4	hatsv40 port 6
TS1	L-arm VME/Scaler	hallavme4	hatsv4 port 7

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Triggers for PVDIS

We will run the spectrometer DAQ concurrently with HAPPEX DAQ, and with VDCs off, for monitoring the detectors and the quality of PID. Periodically we will run at lower current with VDCs on, or under other special conditions, for such things as optics or Q² measurement, background studies, etc.

Here are the triggers on each HRS

T1 = the normal S1.and.S2 scintillator trigger

T2 = the usual efficiency trigger (2 out of 3 from among S1,S2,C)

T3 = a group from preshower (presently group 4, it may change during run)

T4 = a group from shower (presently group 4, it may change during run)

T5 = sum preshower+shower for a group (presently group 4, it may change during run)

T6 = electron narrow (the ``or'' of all groups, i.e. over all focal plane.)
``narrow'' means a narrow signal path. We have ``wide'' and ``narrow'' as a way to estimate deadtime.

T7 = Gas cherenkov (the ``or'' of 10 PMTs)

T8 = the usual 1024 Hz pulser

Recall, T9 - T12 (if exist) cannot be prescaled

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Rebooting HRS crates

Short hint: Type "reboot" at vxWorks prompts of ROC logins.

For details about Hall A spectrometer DAQ including reboot procedure see Bob Michaels' guide.html and guide2.html.

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Running CODA on Spectrometer DAQ

Note: This is for spectrometer DAQ. If you want to run CODA for HAPPEX DAQ see Running CODA for HAPPEX DAQ.

Log in, if necessary, to adaql2 (adaql3) for Right (Left) HRS as user a-onl

The Runcontrol GUI may be already running. If not, see section Spectrometer DAQ cold start. To start and stop runs, click on the buttons Start Run and End Run. Start Run is the same as the sequence Prestart, Go.

For more details about Hall A DAQ and trigger see Bob Michaels's guide.html and guide2.html.

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Starting xscaler for HRS and for PVDIS.

There are scalers in the HRS DAQ, as usual, but also the PVDIS VME crates consist of 4 scalers. Both these systems can be monitored by xscaler.
Use hapc5 which is the PC on the top at the far right of counting room console. Normally xscaler will be running, but if not, log on as adaq, type "xscaler" and do what is commanded of you.

To start xscaler (though usually it is already running):

xscaler
(Everything is explained when you type xscaler, either on adaq or apar account, or if you accidentally type it on on the local account hapc5. Type 'xscaler' and see.)

For HRS you can find all trigger rates in Normalization page. For PVDIS, there are 4 scalers on each spectrometer with obvious tab names.

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Spectrometer Data Analysis

Analysis for Spectrometer DAQ data

We will run the HRS DAQ and analysis concurrently with HAPPEX DAQ and with VDCs off for the following purposes:

Monitor the status of the detectors, like for any HRS-based experiment
Monitor the quality of the PID decisions made by PVDIS electronics.
Measure the deadtime for PVDIS.
FADC checks of selected high-rate signals, e.g. Cherenkov.

Periodically there will be expert-driven runs with VDCs on for the following purposes:

Q² Distribution measurement at low current.

PVDIS deadtime study, including rate/current scan; tagger must be on for this kind of runs.

Background Analysis from Aluminum End Caps, same current as LD2.

Background analysis using field scan to simulate trajectories from inelastics and from pole-tip scattering.

Instructions for Podd analysis: click here for a one-page summary.

Similar to other Hall A experiments that use Podd (the Hall A ROOT/C++ Analyzer)
Run on adaq account on adaql4 - 7. NOT on adaql1,2,3.
Type ``gopvdis'' (or ``goonlana'' -- both work the same)
Type ``analyzer''
In analyzer type ``do_all([run number])''
Alternatively you can type for Left or Right arm:

replay_L([run number])
replay_R([run number])

When using "do_all", a fairly obvious GUI pops up with plots which you must check. Report all problems or strange results in the HALOG.
The ROOTfiles are stored in ./ROOTfiles.

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Hall A Detectors

List of Detectors (up to date as of 10-28-09)

Standard Detectors used for production running during PVDIS:
S1 and S2 scintillators;
Gas cherenkovs (with the extension box on both arms);
lead glass counters: pion rejection on the LHRS and preshower/shower on the RHRS;
HAPPEX Specific Detectors
A whole host of beamline instrumentation too numerous to mention here.

Standard Detectors used for systematic studies (such as optics or Q2 measurements).

VDCs (the HV must be turned off during high rate running)
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Detector High Voltages (up to date as of 9-23-09)

Left arm High Voltage screens are located within the Hall-A Main Menu screen, under Lecroy HV

Beamline(Compton):

Detector Mainframe ID/Slot # Card # Channel # HV (V)

Compton GSO 2 11 1 -1800

Compton Finger 2 11 7 -2000

Compton Finger 2 11 8 -1000

The screen should look like this:

Left Arm (HAPPEX det/S0): <- Update or remove this for PVDIS!

Detector Mainframe ID/Slot # Card # Channel # HV (V)

S0 - Front End 7 2 1 -1700

S0 - Back End 7 2 7 -1700

HAPPEX Det 7 2 9 -1590 (Integrate Mode)

HAPPEX Det 7 2 9 -1900 (Counting Mode)

The screen should look like this:

Right Arm Bottom:
Right Arm HV are no longer available through the Hall A Tools gui. The VNC hvgui must be used to access that HV crate. See below:

VNC HV server (R-HRS detectors)

Starting HVgui for Right HRS detector HV

login as adev@adaql5 (passwd on wall)

type "start_hvgui" If the command fails with message that a server is already running, this may be ok. It may only mean that the server has already been launched. Or it could mean that someone is running the vt100 interface. Try the next step.
If the gui interface does not open, type "hvgui"

Careful: in the listing below, the counting of channel numbers starts with "0"; however, in the VNC display of "Measured Voltage", the numbers at the left of the table start counting at "1", so there is an offset of 1.

The screen should look like this:

Right Arm (HAPPEX det/S0):<- Update or remove this for PVDIS!

Detector Mainframe ID/Slot # Card # Channel # HV (V)

S0 - Front End 14 1 -1700

S0 - Back End 14 3 -1700

HAPPEX Det 14 9 -1200 (Integrate Mode)

HAPPEX Det 14 9 -1600 (Counting Mode)

Right Arm (Lumi Det):

Detector Mainframe ID/Slot # Card # Channel # HV (V)

Lumi #2 15 1 -625

Lumi #3 15 2 -790

Lumi #5 15 4 -780

Lumi #6 15 5 -880

Lumi #7 15 6 -690

Lumi #8 15 7 -615

Lumi #4 15 10 -1040

Lumi #1 15 11 -505

NOTE: These Lumi voltages are nominally for 100 uA current.

VDC check and high voltage

VDC Status

VDC status can be checked on the HAC control window (see below). High Voltages and Gas Flows are constantly being monitored.

VDC HV (IMPORTANT: HV must be turned off during high rate running, i.e. HAPPEX production running.)

Bring up the HAC control window (see below)

In the "VDC HV" section, set HV to 0

In the "Miscellaneous" section, click on the Crate Resets button.

In the "Hall A Slow Controls" window, press the "Reset" button associated with the tripped HV crate.

Go back to set HV values to 4.0 kV

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Helicity Controls

Changing the Half Wave Plate (up to date as of 9-23-09)
To change the state of the insertable half-wave plate (IHWP):

Inform Hall B that we are about to change the half-wave plate. If they are in the middle of the run, then ask them to inform you when their run ends. Once we get the green light from Hall B, proceed into the following steps.

End the current HAPPEX run and the current Compton Run.

Call MCC and ask them to change the state of the Insertable Half-Wave Plate (IHWP) from In to Out or Out to In as appropriate.

When you see the state of the IHWP change in the HAPPEX feedback monitor, type in an xterm (logged in as apar, make sure to log in with the argument -Y):
     flipper

The new setpoints should now appear in the HAPPEX feedback monitor.. ingeneral the Rotatable Half-wave Plate (RHWP) takes a minute or two to change, but HAPPEX III uses the same RHWP position for both HWP states.
   DO NOT START A NEW RUN UNTIL YOU HAVE VERIFIED THE NEW SETPOINTS.

Start a new HAPPEX run and a new Compton Run.

Make a halog entry, saying you've changed the IHWP, and include a screen capture of the HAPPEX feedback monitor (the "runbird" GUI).

Write the new half-wave plate configuration on the white board.

Below is a sample of what the output looks like (from flipper).

[apar@adaql6 ~]$ flipper

****************************************

Only run this program when the IHWP change has
already been made. If not, please Ctrl-C out now!

Current slugnumber = 4
Increment slugnumber? (Y/N)
Y
New slugnumber = 5

Current IHWP = OTU
Desired Settings for IHWP = OUT
Hall-A IA = 4.79
Hall-C IA = 5.00
PC Pos = 8.100
PC Neg = 6.610
RHWP = 1200
Current settings (to be changed)
Hall-A IA = 4.79
Hall-C IA = 5.0
PC Pos = 8.575
PC Neg = 6.125
RHWP = 1200
Writing the current seetings to file /adaqfs/halla/apar/feedback/IHWP.IN for the next flip back.
Performing Flip to IHWP = OUT settings
Halfwave plate OUT, Slug 5

Done... Please verify the new setpoints in the HAPPEX Feedback Monitor.

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PITA Scan (up to date as of 9-23-09)
To measure the Polarization Induced Transport Asymmetry (PITA) slope:

End the current HAPPEX run and the current Compton Run.

Check the status of the IHWP (IN or OUT), and set it to the state desired.

Turn off the HAPPEX feedback monitor by typing
     feedback off
in an xterm (logged in as apar). You should check that the feedback status is indeed off on runbird.

Set the PC voltages appropriate for the IHWP setting. To set the voltages, open Hall Parity Controls from the Gun/Laser in the Accelerator Main Menu. We are using GUN2 currently. The voltages should be set for GUN2: PC (PITA) POS and GUN2: PC (PITA) NEG appropriately. Check the run-sheet from the previous runs to make sure the voltage you have is correct for the current IHWP setting.
If for some reason, you are not able to change the voltages on the Hall Parity Controls , call MCC and ask them to do so!

Start greenmonster from apar@adaql1 by typing greenmonster.

Go to the ScanUtil tab, and click on NOT CLEAN. Set the values on Set Point 1 and Set Point 2 to 0 . Click on Set Values, and check that the set points are indeed set to 0 by clicking on Check Status .

Start a new HAPPEX run.

After about 200 events click on CLEAN .

After about 10000 GOOD events (beam trip events are not GOOD events), click on NOT CLEAN .

Set the PC (PITA) POS to the previous value + 1 and PC (PITA) NEG to the previous value -1 . For instance, if the previous POS/NEG were 8.5/6.2 , the new values should be 9.5/5.2 .

Set the values on Set Point 1 to +60 . Click on Set Values, and check that it is set to +60 by clicking on Check Status .
Click on CLEAN .

Repeat steps 9-12 , but setting the voltages in the opposite direction. The new set points should be POS/NEG 7.5/7.2 , and Set Point 1 at -60 for the example above.

After about 10000 GOOD events , end the HAPPEX run, and run the prompt analysis in apar@adaql4 by doing gopan, prompt runnumber .

After the prompt replay is done, run hapPITA.C gui by typing gopan, pan, then
.x lmacro/hapPITA.C(runnumber)

Make a halog entry with the PITA slope, IHWP status, run # and the output plot of the gui with the PITA slope. Here is a typical PITA plot.

Write the half-wave plate configuration on the white board.

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HAPPEX Charge Asymmetry Feedback (up to date as of 9-23-09)
For a detailed description of the HAPPEX Charge Asymmetry Feedback, look at Bryan Moffit's entry from transvertisy.

The only thing that needs to be changed after each PITA/IA scan is the feedback slope, which is done in the file panFFB.db in ~/feedback/ in apar account.

To turn charge feedback on, type feedback on

To turn charge feedback off, type feedback off

The charge feedback status should be checked in rundirb , which can be brought up by typing rundird .

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Miscellaneous

Bringing up the Beamtime Counting Table

Log in to adaql1 as user adaq

Type "bta"

An attempt is made to automate the entries, but the shift leader should check it based on their own estimates of ABU, BANU, etc.

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Plotting time dependences of EPICS variables

In the HAC control window, press the "StripTool" label in tools launcher, which allows you to plot any EPICS variables versus time.

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Printing in the counting house

On hopefully all adaq computers the command print should work. Type print filename for a file named filename and it will print out on the cha2hp printer in the back room. If you want to print to another printer, type print filename otherprinter. If that doesn't work try the command line below.

rlpr -Pcha2hp -Hjlabprt file.ps

Printing from Mozilla:

Use

File->Print...

Choose to print to printer, not file

Click on Properties (or Configuration?) of printer

In the field for Print command, enter:

/apps/bin/rlpr -Pcha2hp -Hjlabprt
(you should only have to do this once for each account)

Click Print

Alternatively, you can have Mozilla print to a Postscript file, which you can then print from the command line.
Trying to print to cha2hp from a CUE machine (e.g. jlabl1) using pdq will also fail. This is not a problem specific to the counting house computers. Only lpr and rlpr will work with this printer.

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Starting HALOG (up to date as of 9-23-09)

As user adaq on any adaq.. machine, simply type

> halog

Entering text is easy and straightforward. After submitting the entry, the white text on blue background in the lower right corner of the window should read 'Entry complete', otherwise something is wrong.

Entering graphics: Click Grab Screen in the bottom button row of the halog window. The halog window will disappear, and the window the cursor is in will become the active window, its outline flashing. You can select any window by clicking in it on the left mouse button. You also can select an arbitrary part of the screen by holding down the left mouse button and dragging the cursor along. All the time a rectangle will flash that indicates the selected area. Releasing the mouse button will then cause this screen area to be included into the entry. It will show up as a thumbnail picture in the halog window, where you can discard it or accept it, or go for a second screen grab. The images are in GIF format.

For more details about HALOG see halog HOWTO and FAQ page.

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Starting spot++ and checking the raster

Log in to as adaq on adaql4 or any other adaq Linux computer.

Make sure CODA is running with beam on. Of course, that's the spectrometer DAQ, not the HAPPEX DAQ. You'll need some triggers (adjust prescale factors to get at least 50 Hz of something, if possible).

Type spot++ from any directory, after about 30 seconds, plots will pop up.

Hint: Type "spot help" to learn more options.

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Other Problems

If you can't solve a problem

Call Run Coordinator A.S.A.P.
Cell phone: 876-1787. Generic pager: 584-5411, but the RC might have his own pager, see white board.

Techs: See the white board. They normally want to be paged before phoned at home. Always contact the Tech-on-call first; never call any other Tech without permission from Tech-on-call.

Computers: Page Ole Hansen (7627) or Bob Michaels (7410).

HAPPEX DAQ: Page Bob Michaels (7410) or Luis Mercado (0042).

Spectrometer DAQ: Page Bob Michaels (7410) or Bodo Reitz (5064).

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HAPPEX Home

webmaster Last modified: 10/28/2009who

			changes to be made for PVDIS
			Fig. 1 and 2 should have one of the PVDIS bcm copies. Fig. 3 should have (or another page should be added) for the asymmetry of PVDIS bcm copies, and their correlation with bcm1 or bcm2.
			These 3 can stay the same
			Fig. 7 and 8 should be replaced by PVDIS signals. Suggest rate and asymmetries of: e4n, e4w, e5n, e5w, pi4n, pi4w, pi5n, piw, and the overall en, ew, pin, piw, for both left and right arms.

Detector	Mainframe ID/Slot #	Card #	Channel #	HV (V)
Compton GSO	2	11	1	-1800
Compton Finger	2	11	7	-2000
Compton Finger	2	11	8	-1000

PVDIS How To Page

Troubleshooting (note: link is working again)

HAPPEX/PVDIS Data Acquisition (Updated Nov 4, 2009)

HAPPEX Data Analysis (Updated 11/04/09)

Spectrometer

Target How to (updated 11/5/09)

Spectrometer Data Acquisition

Spectrometer Data Analysis

Hall A Detectors (Updated [date])

Compton Polarimeter

Helicity Controls

Miscellaneous

Other Problems

HAPPEX/PVDIS Data Acquisition

HAPPEX/PVDIS Data Analysis

Online Data Monitor (up to date as of 11-04-09). Click here for a one-page summary.

Starting prompt analysis (up to date as of 11-04-09). Click here for a one-page summary.

Spectrometer

Target How to

Target Important Notice:

Target Status for PVDIS:

What to do if target temperature drops fast?

Spectrometer Data Acquisition

Spectrometer Data Analysis

Hall A Detectors

Helicity Controls

Changing the Half Wave Plate (up to date as of 9-23-09)

PITA Scan (up to date as of 9-23-09)

HAPPEX Charge Asymmetry Feedback (up to date as of 9-23-09)

Miscellaneous

Other Problems