Difference between revisions of "Sampling Calorimeter"

Revision as of 22:20, 26 February 2013

Links

• pages from HERA-B Technical Design Report
• HERA-B Calorimeter NIM article by G. Avoni et al .Nucl.Instrum.Meth. A580 (2007) 1209-1226. DESY server version
• Conference contribution describing the calorimeter electronics.
• NIM article on the PHENIX EmCal. Phenix Thesis which has sections on the EMCal.
• NIM article on IHEP prototype EmCal for PANDA.
• Test facilities
  • ESTB at SLAC (2.5-15GeV electron)
    • news
    • user meeting 2012
    • workshop 2011
  • Fermilab (32 - 1 GeV: Pions, electrons, kaons, or broadband muons)
  • Idaho (<48MeV electron)
• Directory of calorimeter papers collected by Zhiwen Zhao.
• SBS Meeting 06/02/2013 presentation of Carlos Ayerbe

Test setup

Nomenclature of the modules (could be changed)

In order to identify the different modules, the following structure is used:

X-YY-Z

with:

• X = O (outer) or M (middle)
• YY= 01, 02, 03, 04 ...
• Z (only Middle modules) = A, B, C, D

HV control

• Running HV control
  • In one terminal:
    • Login in as gep5.
    • type: "su".
    • cd to slowc/LecroyHV_Shimdir .
    • type: ./LecroyHV_Shim_LocalPerl
    • SHould connect to Lecroy crate and give the following message.
  • After LecroyHV_Shim_LocalPerl is running. In another terminal :
    • login as gep5 .
    • cd to slowc .
    • type : ./hvs BOB_TEST
    • Gui window shuold pop up.
  • Presently scintillator Top 1R, Bot 1 and Bot 2 in HV module 13 and chan 0,1,2
  • Calo blocks 1-12 in module 15 for 0-11 and blocks 13-21 in module 14 chan 0-8.

• HV modules were tested by running -2000V across a 5 Megaohm resistor. we measured the voltage out and current out. The histogram below is the percent error in expected current values. The PDF is the charts holding the data taken during the test. Once the HV mosules are back in the TEDF another (more accurate) test may or may not be performed.

File:HV TEST2.pdf

Histogram

HV to Match Gain on Calorimeters

Light Leaks sealing

The modules were sealed from light leaks with the use of black tape. To check the sealing, the output of the PMT was measured with an micro-amperimeter, before and after the cover with tape. In top of the pipe, where the PMT is allocated, a gum stopper with slits for the cables, are placed. After many checks it was found that:

• the main light leak come for the joint of the module with the PMT allocation pipe. (Covering it, reduce the current drain from PMT aproximatly in 1-2 orders of magnitude)
• covering the cap of the pipe, doesn't show significant improve.
• covering with tape the side corners of the module, the joint of the top and bottom plastic caps and the union of the pipe with the module reduce the current drain from PMT in 4-5 orders of magnitude.

Outer Modules

For the outer modules, the same PMT was used, with a voltage of 1000 V (max 1900 V) to avoid damage to the PMT.

Middle Modules

For the middle modules, the same PMT was used, with a voltage of 1000 V (max 1900 V) to avoid damage to the PMT.

Trigger

This is the flow chart for the current trigger logic. We are using 3 scintillators; 1 double sided (2PMTs) on top, and 2 separate scintillators on bottom. The difference between threshold voltages is to match gains, this was not done by adjusting HV since presently using HV units with dual outputs for one HV setting.

Trigger Logic Chart

Scheme of cables

Scheme of the HERA-B modules. The orientation is as follows: top view with the rack modules at its left. Each module is indicated by its nomenclature (explained above), the DAQ and HV cable number (in red) and the signal cable (sgn).

Red: the number of the channel (for DAQ and HV label). Sgn: cable signal label.

Cosmic Test

• Initial cosmic test could not have the entire calorimeter with HV since Jack has borrowed the Lecroy HV Crate. Got HV crate back on Feb 12 and started with run 45.
• CODA
  • If computer is rebooted needed to login in as coda and open an terminal and type: msqld
  • As coda start another terminal and type : ./startcoda.
  • This opens Xterm windows for the rcplatform, coda_eb_rc3, coda_er_rc3, rcgui, ssh (connection to the ROC and start ) and the main GUI Run Control.
  • Run Control GUI should be in configuration=V792 and Session=TEDFSBS and EXPID=TEDFSBS.
  • From the Platform menu select "Connect".
    • click on the "Configure" button. Once EB,ER and ROC configured
    • click on the "Download" button. Once EB,ER and ROC downloaded
    • Click on the start run button.
  • If problems first try clicking on the "Reset" button and startover with the "Configure", "Download" sequence.

• Replay data
  • login as gep5
    • type: source setanalyzer.sh
    • cd Desktop/eel122
  • to create root tree:
    • analyzer
    • at analyzer prompt type: decodeEel(Run number)
    • Create root tree in file eeltestrun#.root
    • then quit analyzer with: .q
• Analyzer root tree
  • type: root eeltestrun#.root
• Calo HV on O-01,O-02,O-03,O-04 in ADC channels 0,1,2,3 (CHANGE!!! O-02-> ADC channel 24 after run 51)
• Scint HV on Top left, Top right, Bot 1, Bot 2 in ADC channels 24,21,23,22 for run 33 . After run 33 adc channels 8,5,7,6
• Trigger shown above.

• Voltages till run 54

Modules Channels #-#

Modules Channels #-#

Scintillators

Run sheet

Run Number	Start time	End time	Events	Calo HV	Scint HV	Comments	ADC Spectra
33	Fri 2-8 16:27:39	Mon 2-11 11:07:40	10593	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	No signal in ADC 22 ( Fix be replacing bad 36ns delay cable) Calo HV adc chan 0,1,2,3 (did not see 1 & 3, seems to be problem with the ADC cable move to cable with the scintillator signals and put this cable in the slot for 0-15)
34	Mon 2-11 12:04:07	crashed	9102	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	Run crashed. Found that the trigger cable has been moved ( Put it back for run 35). Calo O-01,O-02,O-03,O-04 in ADC channels 0,1,2,3 . Top 1L, Top 1R , Bot 1,Bot 2 channels 6,5,7,8. Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 30,50,30,30 mV. Something is strange with data. Looking at Top 1L (adc[8]) see that most events are pedestal. Found that gate had been removed.
35	Tues 2-12 10:25	Tues 2-12 10:29	?	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	Test run to see if DAQ was working
36	Tues 2-12 11:21	Tues 2-12 11:31	17431	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	Test run to check timing between ADC signal and ADC gate. Set trigger to be just Top scintillator. Put the L1A into a gate generator to get a gate width of 300ns. The gate arrived about 30ns before the ADC signal.
37	Tues 2-12	Tues 2-12 11:59	??	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	Placed small bottom scint on the top. Made trigger the AND between "bot 1" and "Top 1L AND 1R". ADC cable was upsidedown
38	Tues 2-12 12:00	Tues 2-12 12:14	1709	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	Placed small bottom scint on the top. Made trigger the AND between "bot 1" and "Top 1L AND 1R". ADC cable is corrected. Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 30,50,30,30 mV.
39	Tues 2-12 12:17	Tues 2-12 12:20	??	1500, 1500, 1500, 1500	1500, 1500, 1500, 1500	Placed small bottom scint on the top. Made trigger the AND between "bot 1" and "Top 1L AND 1R". Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 50,50,50,50 mV.
40	Tues 2-12 12:21	Tues 2-12 12:30	??	1500, 1500, 1500, 1500	1600, 1600, 1600, 1600	Placed small bottom scint on the top. Made trigger the AND between "bot 1" and "Top 1L AND 1R". Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 50,50,50,50 mV. Top 1R peak is about 1000, top 1L has no peak. Bot 1 (adc 7) has slight overflow above 4096
41	Tues 2-12 12:33	Tues 2-12 13:49	16969	1500, 1500, 1500, 1500	1600, 1600, 1600, 1600	Placed small bottom scint back on the bottom. Made trigger the AND between "Bot 1" and "Bot 2". Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 50,50,50,50 mV.
42	Tues 2-12 13:57	Tues 2-12 14:02	1189	1500, 1500, 1500, 1500	1600, 1600, 1600, 1600	Placed small bottom scint back on the bottom. Made trigger the AND between "Bot 1" and "Bot 2". Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 50,50,100,100 mV.
43	Tues 2-12 14:05	Tues 2-12 14:08	603	1500, 1500, 1500, 1500	1600, 1600, 1600, 1600	Placed small bottom scint back on the bottom. Made trigger the AND between "Bot 1" and "Bot 2". Thresholds for Top 1L, Top 1R , Bot 1,Bot 2 are 50,50,100,150 mV. Crashed when ending run.
44	Tues 2-12 14:23	CRASHED	00	1500, 1500, 1500, 1500	1600, 1600, 1600, 1600	Run crashed immeadiately upon beginning
45	Tues 2-12 17:09	Tues 2-12 17:11	27718	all 1600	1600, 1600, 1600, 1600	Full Lecroy HV crate. Test DAQ with trigger an OR of scintillators.
46	Tues 2-12 18:40	Wed 2-13 15:10	3474	all 1600	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of scintillators.
47	Wed 2-13 15:16	Thru 2-14 9:44	3043	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of scintillators.
48	Thur 2-14 9:47	Thur 2-14 12:00	1084	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2.
49	Thur 2-14 12:05	Thur 2-14 12:11	-	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2. Top Scintillator position corrected. False test!!
50	Thur 2-14 12:22	Thur 2-14 13:54	715	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2. Top Scintillator position corrected. Module 1 (O-01) swap with module 2 (O-05)
51	Thur 2-14 14:06	Tues 10:25	53,704	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2. Top Scintillator position corrected. Module 1 swap with module 2. Cable signal form module 2 (adc 1) changed to adc 24 Scint Bot1 was not connected
52	Tues 2-19 10:37	Tues 10:50	82	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2. Top Scintillator position corrected. Module 2 (O-05) swap with module 3 (O-02). Scint Bot1 still not connected (need a 54 ns delay cable)
53	Tues 2-19 11:07	Tues 2-19 11:24	137	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2. Top Scintillator position corrected. Module 2 swap with module 3. Scint Bot1 connected. BAD CONNECTION CABLE OF Scint Bot1
54	Tues 2-19 11:40	Thur 2-21 11:16	20664	need table	1600, 1600, 1600, 1600	Full Lecroy HV crate. DAQ with trigger an AND of Top 1R and Bot 2. Top Scintillator position corrected. Module 2 swap with module 3. Scint Bot1 connected (adc 30)
55	Thur 2-21 16:08	Mon 2-25 16:02	42290	need table	1600, 1600, 1600, 1600	module 4 (O-04) placed in center (swap with module 3 (O-02)), HV for pmts have been rate matched
56	Mon 2-25 16:32	Tues 2-26 12:08	8502	need table	1600, 1600, 1600, 1600	module 4 (O-04) placed in center, HV for pmts have been rate matched. PMT from module O-01 changed with PMT from module O-04
57	Tues 2-26 12:18			need table	1600, 1600, 1600, 1600	HV on Module O-04 (containing pmt 0-01) set to 1600. HV on module O-01 (containing pmt o-04) set to 1715, HV on M-02C set to 1750