Difference between revisions of "Thursday, Apr. 7: SWING Shift"

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(New page: Return to List of Daily Run Plans)
 
 
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Return to [[Daily_Run_Plans|List of Daily Run Plans]]
 
Return to [[Daily_Run_Plans|List of Daily Run Plans]]
 +
 +
====Shift Status Notice====
 +
MCC is hopeful that CW beam could be delivered by DAY shift.
 +
* '''All''' shift crew should report to the counting house at the start of the SWING shift.
 +
 +
====Shift Duties When No Beam====
 +
* Monitor target (keep in HOME position)
 +
* Respond to calls and alert RC as needed.
 +
* Fill out shift checklist during this shift.
 +
* If beam is close to returning, '''notify''' the RC.
 +
 +
====If Beam Returns====
 +
* Perform Beam After Extended Downtime procedure from below
 +
<!-- * Perform extended ~20 minute Carbon Hole run (only '''once''') -->
 +
* Proceed with Production data taking.
 +
 +
====Beam After Extended Downtime====
 +
This procedure is to be
 +
* Harp Scans
 +
** Move target to HOME position (if not already there) (mask target motion!)
 +
** Turn VDC HV '''OFF''' for both arms.
 +
** Turn DVCS Calo HV '''OFF'''
 +
** Ask MCC for Raster '''OFF''' (check that it turns off in the scope)
 +
** Ask MCC to perform Harp Scans (on IHA1H04A and IHA1H04B)
 +
*** Must have three peaks on each with a resolution of ~200-500 &mu;m
 +
*** Have seen a "shoulder" on the last peak before.  May be acceptable if other 2 peaks are fine.
 +
** Ask MCC to make an ELOG with the results of the Harp Scans
 +
* Beam Centering on Carbon Hole Target
 +
** Move target to the Carbon Hole position (mask target motion!)
 +
** Ensure Left-HRS momentum is ~1 GeV/c
 +
** Set Left-HRS DAQ configuration to [https://hallaweb.jlab.org/wiki/index.php/How_to_HRS_/_DVCS#Changing_from_the_.22DVCS.22_run_type_to_the_.22LHRSnew.22_run_type LeftHRSnew]
 +
*** Set prescales as ps_i = 1 for i = 1-6, and ps=0 for all others
 +
** Turn VDC HC '''OFF''' for both arms.
 +
** Turn DVCS Calo HV '''OFF'''
 +
** Ask MCC for Raster '''ON''' at 2x2
 +
*** Check that it turns '''on''' in the scope, and check Raster GUI to confirm 2x2 setting
 +
** Ask MCC for 5 &mu;A beam
 +
*** Run spot_L as explained in the [http://hallaweb.jlab.org/equipment/daq/spot.html detailed instructions]
 +
*** If not centered ask MCC to move beam accordingly (check board for coordinates)
 +
*** Repeat test with different beam position until target is centered.
 +
* Raster Target
 +
** Start the same settings as carbon hole centering
 +
** Move to Raster Target (mask target motion!)
 +
** Ask MCC for 5uA beam with Raster ON (2x2)
 +
** Check rates and confirm they are consistent with rates seen during HOME position
 +
*** If the rates are low and consistent, then move on to next step
 +
*** If the rates are high, it may indicate the beam has an angle that causes the beam to scrape on an edge of the target
 +
**** Notify the RC
 +
**** Ask MCC to readjust bpm positions until this angle is removed
 +
**** When done, perform another Carbon Hole run just to be sure.
 +
 +
<!--
 +
====Extended Carbon Hole Run====
 +
This is to be performed only '''once''' and may be skipped if already performed in previous shift.
 +
* Move target to Carbon Hole position (mask target motion!)
 +
** Ensure Left-HRS momentum is ~1 GeV/c
 +
** Set Left-HRS DAQ configuration to [https://hallaweb.jlab.org/wiki/index.php/How_to_HRS_/_DVCS#Changing_from_the_.22DVCS.22_run_type_to_the_.22LHRSnew.22_run_type LeftHRSnew]
 +
*** Set prescales as ps_i = 1 for i = 1-6, and ps=0 for all others
 +
** Turn the Right-HRS VDC HV '''OFF'''
 +
** Turn the Left-HRS VDC HV '''ON'''
 +
** Turn DVCS Calo HC '''OFF'''
 +
** Ensure Raster '''ON''' at 2x2
 +
*** Check that it turns '''on''' in the scope, and check Raster GUI to confirm 2x2 setting
 +
** Ask MCC for 5 &mu;A beam
 +
** Take ~20 minute run with this setting.
 +
 +
-->
 +
 +
====Production Running====
 +
For the remainder of the shift take 1 hour runs in the production configuration '''DVCS: Kin_48_2'''
 +
{|
 +
|Beam current
 +
|15 &mu;A
 +
|-
 +
|Target
 +
|LH2
 +
|-
 +
|Raster
 +
|ON (2x2mm<sup>2</sup>)
 +
|-
 +
|VDC HV (both arms)
 +
|ON
 +
|-
 +
|DVCS Calo HV
 +
|ON
 +
|-
 +
|DVCS Calo Angle;
 +
|15.185&deg;
 +
|-
 +
|DVCS Calo Distance
 +
| 2.0 m
 +
|-
 +
|LHRS Polarity
 +
|Negative
 +
|-
 +
|LHRS Momentum
 +
|3.996 GeV/c
 +
|-
 +
|LHRS Angle
 +
|20.243&deg;
 +
|-
 +
|LHRS Q1 Current
 +
|1916.640 (regulator '''OFF''')
 +
|-
 +
|LHRS DAQ Config
 +
|DVCS
 +
|-
 +
|prescaleL
 +
| PS9=1 (all others zero)
 +
|-
 +
|RHRS Polarity
 +
|Negative
 +
|-
 +
|RHRS Momentum
 +
|2.101 GeV/c
 +
|-
 +
|RHRS Angle
 +
|48.892&deg;
 +
|-
 +
|RHRS DAQ Config
 +
|RHRSadaq2
 +
|-
 +
|prescaleR
 +
| PS1=PS2=PS3=1, && PS8=200 (all others zero)
 +
|-
 +
|}
 +
 +
<!--
 +
 +
- Calo_theta= 10.1(deg), Distance = 2.5m (from target)<br/>
 +
- LHRS=3.996 GeV/c (negative pol), angle=20.243(deg), Q1=1916.640 (readout:1900)/1600/1600 (Q1 regul.OFF)<br>
 +
- RHRS=2.101 GeV/c (negative pol), angle=48.892(deg)<br>
 +
- PreScaleR : PS1=PS2=PS3=1, && PS8=200<br>
 +
- PreScaleL : PS9 =1, + DVCS config.<br><br>
 +
- Raster : 2x2mm^2
 +
 +
-->

Latest revision as of 11:08, 7 April 2016

Return to List of Daily Run Plans

Shift Status Notice

MCC is hopeful that CW beam could be delivered by DAY shift.

  • All shift crew should report to the counting house at the start of the SWING shift.

Shift Duties When No Beam

  • Monitor target (keep in HOME position)
  • Respond to calls and alert RC as needed.
  • Fill out shift checklist during this shift.
  • If beam is close to returning, notify the RC.

If Beam Returns

  • Perform Beam After Extended Downtime procedure from below
  • Proceed with Production data taking.

Beam After Extended Downtime

This procedure is to be

  • Harp Scans
    • Move target to HOME position (if not already there) (mask target motion!)
    • Turn VDC HV OFF for both arms.
    • Turn DVCS Calo HV OFF
    • Ask MCC for Raster OFF (check that it turns off in the scope)
    • Ask MCC to perform Harp Scans (on IHA1H04A and IHA1H04B)
      • Must have three peaks on each with a resolution of ~200-500 μm
      • Have seen a "shoulder" on the last peak before. May be acceptable if other 2 peaks are fine.
    • Ask MCC to make an ELOG with the results of the Harp Scans
  • Beam Centering on Carbon Hole Target
    • Move target to the Carbon Hole position (mask target motion!)
    • Ensure Left-HRS momentum is ~1 GeV/c
    • Set Left-HRS DAQ configuration to LeftHRSnew
      • Set prescales as ps_i = 1 for i = 1-6, and ps=0 for all others
    • Turn VDC HC OFF for both arms.
    • Turn DVCS Calo HV OFF
    • Ask MCC for Raster ON at 2x2
      • Check that it turns on in the scope, and check Raster GUI to confirm 2x2 setting
    • Ask MCC for 5 μA beam
      • Run spot_L as explained in the detailed instructions
      • If not centered ask MCC to move beam accordingly (check board for coordinates)
      • Repeat test with different beam position until target is centered.
  • Raster Target
    • Start the same settings as carbon hole centering
    • Move to Raster Target (mask target motion!)
    • Ask MCC for 5uA beam with Raster ON (2x2)
    • Check rates and confirm they are consistent with rates seen during HOME position
      • If the rates are low and consistent, then move on to next step
      • If the rates are high, it may indicate the beam has an angle that causes the beam to scrape on an edge of the target
        • Notify the RC
        • Ask MCC to readjust bpm positions until this angle is removed
        • When done, perform another Carbon Hole run just to be sure.


Production Running

For the remainder of the shift take 1 hour runs in the production configuration DVCS: Kin_48_2

Beam current 15 μA
Target LH2
Raster ON (2x2mm2)
VDC HV (both arms) ON
DVCS Calo HV ON
DVCS Calo Angle; 15.185°
DVCS Calo Distance 2.0 m
LHRS Polarity Negative
LHRS Momentum 3.996 GeV/c
LHRS Angle 20.243°
LHRS Q1 Current 1916.640 (regulator OFF)
LHRS DAQ Config DVCS
prescaleL PS9=1 (all others zero)
RHRS Polarity Negative
RHRS Momentum 2.101 GeV/c
RHRS Angle 48.892°
RHRS DAQ Config RHRSadaq2
prescaleR PS1=PS2=PS3=1, && PS8=200 (all others zero)


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