Difference between revisions of "SRC/CT Run Plan"

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==Tentative Schedule==
+
==Plan for 8 Nov-6 Dec==
 +
Note that shifts here correspond to accelerator shifts.
 +
 
 +
See visually [https://docs.google.com/spreadsheets/d/1mJQTz5b4_HL_RNFRoc7gC2DBMOICDmvOxjHiTIT3ZWw/edit?usp=sharing here]
 +
 
 +
'''The standard configuration of the GlueX detector will be used during the SRC run'''
  
 
{| class="wikitable"  
 
{| class="wikitable"  
 
|- style="font-weight:bold;"
 
|- style="font-weight:bold;"
 
! Activity
 
! Activity
−
! Time
+
! Time (shifts)
−
! Beam Conditions<br />
+
! Beam current (nA)
 +
! Radiator (R.L.)
 +
! Comment <br />
 
|-
 
|-
−
| Target change C ladder<br /><br />
+
| columnspan="5" | <span style="color:red"> Liquid He target </span>  
−
| 3 shifts
+
−
| no beam
+
 
|-
 
|-
−
| Detector and DAQ checkout
+
| Tune beam to tagger hall
−
| 2 shifts
+
| 3
−
| 140 nA
+
|
 +
|
 +
|
 
|-
 
|-
−
| Luminosity Scan
+
| Ion chamber calibration <br /> Radiation monitor check 
−
| 1 shift
+
| 0.6
−
| Varies
+
|
 +
|
 +
|
 
|-
 
|-
−
| Run with C target<br />
+
| Harp scan for electron beam
−
| 20 days (12 days proposal)
+
| 0.2
−
| 140 nA
+
|
 +
|
 +
| Establish photon beam
 
|-
 
|-
−
| Compton running for density checks
+
| Calib active collimator
−
| 1 shift
+
| 0.5
−
|  
+
|
 +
|
 +
|
 
|-
 
|-
−
| Target change to 4He
+
| Align JD70 - 105 radiator
−
| 5 shifts
+
|1.5  
−
|  
+
|
−
|-
+
| 4x10<sup>-4</sup>
−
| Compton running for density checks
+
|
−
| 1-2 shift
+
−
|  
+
 
|-
 
|-
−
| Run with 4He
+
| Detector checkout, Trigger / DAQ tuning
−
| 10 days (10 days proposal)
+
| 3
−
| 140 nA
+
| 10 - 150
 +
| same
 +
|
 
|-
 
|-
−
| Empty Cell Run
+
| Collect data in raw mode
−
| 1 shift
+
| 0.1  
−
| 140 nA
+
| 10 - 150
 +
|
 +
|
 
|-
 
|-
−
| Target change to D
+
| Total
−
| 3 shifts
+
| 2.5 days
 +
|
 +
|
 
|  
 
|  
 
|-
 
|-
−
| Run D
+
| <span style="color:blue"> Production with 4He target </span> <br />
−
| 8 days (5 days proposal)
+
| 48 ( 12 days )   <br />  1 <br /> 1
−
| 140 nA
+
| 150  <br /> 150  <br /> 50 
 +
| 4x10<sup>-4</sup>  <br /> 4.5x10<sup>-4</sup> (AMO) <br /> 4x10<sup>-4</sup>
 +
| <br /> <br /> Insert CCAL, HV on for low-energy TAGH
 
|-
 
|-
−
| Target change to Cu
+
| <span style="color:blue"> Empty (He) target run </span>
−
| 5 shifts
+
| 2
 +
|
 +
|
 
|  
 
|  
 
|-
 
|-
−
| Run with Cu
+
| <span style="color:red"> Target change to D </span>
−
| 10 days
+
| 2.0
−
| 140 nA
+
|
−
|-
+
|
−
| Total
+
−
| 54 days
+
 
|  
 
|  
−
|}
 
−
 
−
Proposed plan for 8 Nov-6 Dec:
 
−
 
−
{| class="wikitable"
 
−
|- style="font-weight:bold;"
 
−
! Activity
 
−
! Time
 
−
! Beam Conditions<br />
 
 
|-
 
|-
−
| Target change C ladder<br /><br />
+
| <span style="color:blue"> Production with D target </span>
−
| 3 shifts
+
| 8 (2 days) 
−
| no beam
+
| 140
 +
|
 +
| <br /> Insert CCAL, HV on for low-energy TAGH
 
|-
 
|-
−
| Detector and DAQ checkout
+
| TAC run (use CCAL as TAC)
 
| 2 shifts
 
| 2 shifts
−
| 140 nA
+
| < 5
 +
| 2x10<sup>-5</sup>
 +
| Empty liquid target
 
|-
 
|-
−
| Luminosity Scan
+
| <span style="color:red"> Target change to C </span> <br /> Ramp the solenoid magnet down <br /> Install and align target <br /> Ramp the magnet up
−
| 1 shift
+
| <br /> 1.25  <br /> 1.5                <br /> 1.25
−
| Varies
+
| <br />  -  <br />  -                  <br />  -
 +
| <br />  -  <br />  -                  <br />  -
 +
|  
 
|-
 
|-
−
| Run with C/Cu target<br />  
+
| <span style="color:blue"> Production with C target </span>  
−
| 14 days
+
| 68  ( 17 days )  <br /> 2 
−
| 140 nA
+
| 150  <br /> 50
 +
|  4x10<sup>-4</sup>
 +
| <br /> Insert CCAL, HV on for low-energy TAGH
 
|-
 
|-
−
| Target change to 4He
+
| <span style="color:red"> Target change to D </span> <br /> Ramp the solenoid magnet down <br /> Install and align target <br /> Ramp the magnet up
−
| 5 shifts
+
| <br /> 1.25  <br /> 1.5     <br /> 1.25
 +
| <br />  -  <br />  -    <br />  -
 +
| <br />  -  <br />  -    <br />  -
 
|  
 
|  
 
|-
 
|-
−
| Compton running for density checks
+
| <span style="color:blue"> Production with D target </span>
−
| 1-2 shift
+
| 24 (6 days) 
 +
| 140
 +
|
 
|  
 
|  
−
|-
+
|
−
| Run with 4He
+
−
| 4 days (10 days proposal)
+
−
| 140 nA
+
−
|-
+
−
| Empty Cell Run
+
−
| 1 shift
+
−
| 140 nA
+
−
|-
+
−
| Target change to D
+
−
| 3 shifts
+
−
|
+
−
|-
+
−
| Run D
+
−
| 6 days (5 days proposal)
+
−
| 140 nA
+
 
|-
 
|-
 
| Total
 
| Total
−
| 28 days
+
| 42 days
 +
|
 +
|
 
|  
 
|  
 
|}
 
|}
 +
 +
===Possible detailed plan for C->D change (not finalized)===
 +
Monday (13th):<br>
 +
1900: Begin to ramp down solenoid
 +
 +
Tuesday (14th):<br>
 +
0300: Solenoid is ramped down, take straight track running, may need to optimize trigger for this<br>
 +
0700/0800: RadCon sweep, Hall in Controlled?<br>
 +
0800-1200: Survey and alignment of carbon foil target<br>
 +
1200-1700: Techs and Chris swap C target with D<br>
 +
1700-0100: Ramp solenoid, pump target<br>
 +
0100: Production D data
  
 
==General Conditions==
 
==General Conditions==
  
−
The following numbers were taken from the [https://halldweb.jlab.org/hdops/wiki/index.php/Standard_Production_Running_Conditionsstandard production running conditions].
 
−
 
−
Numbers need to be updated for our run.
 
  
 
{| border
 
{| border
 
|-
 
|-
 
! Item !! Polarized Beam  
 
! Item !! Polarized Beam  
 +
|-
 +
| Beam Energy || 10.9 GeV
 
|-
 
|-
 
| Beam Current || 140 nA  
 
| Beam Current || 140 nA  
 
|-
 
|-
−
| Active Collimator (Inner) optimal coordinates || x = 1.0 mm, y = &minus;0.2 mm  
+
| Active Collimator (Inner) optimal coordinates || x = 0 mm, y = &minus;0.2 mm (Will be updated)
 
|-
 
|-
 
| BPM (IPM5C11B) optimal coordinates || x = &minus;0.5 mm, y = +1.0 mm  
 
| BPM (IPM5C11B) optimal coordinates || x = &minus;0.5 mm, y = +1.0 mm  
Line 135: Line 155:
 
| Tagger Quadrupole (MQPAD00) Current || &minus;4.2 A  
 
| Tagger Quadrupole (MQPAD00) Current || &minus;4.2 A  
 
|-
 
|-
−
| Tagger Magnet Current || 208.4 A
+
| Radiator || JD70-105, 47 &mu;m 4·10<sup>-4 </sup> R.L., 4.5·10 <sup>-4</sup> R.L. AL radiator (30 µm Al), 2·10<sup>-5</sup> R.L. AL 
 
|-
 
|-
−
| Radiator || JD70-105, 47 &mu;m
+
| Coherent Peak Position || 8.6 GeV
−
|-
+
−
| Coherent Peak Position || 8600 &plusmn; 10 MeV
+
 
|-
 
|-
 
| Beam Profiler || retracted  
 
| Beam Profiler || retracted  
Line 145: Line 163:
 
| Collimator || 5.0 mm  
 
| Collimator || 5.0 mm  
 
|-
 
|-
−
| TPol target || Be 75 &mu;m  
+
| Pair Converter || Be 75 &mu;m
 
|-
 
|-
−
| Pair Spect. Convertor || retracted
+
| Pair Spect. Magnet Current (set point) || 850 A  
−
|-
+
−
| Pair Spect. Magnet Current (set point) || 910 A  
+
 
|-
 
|-
 
| GlueX Solenoid || 1350 A  
 
| GlueX Solenoid || 1350 A  
Line 156: Line 172:
 
|}
 
|}
  
−
==Trigger Types==
 
  
−
The experiment will have physics and monitoring triggers in the data stream.
+
=== Corrections to the photon flux due to the smaller beam energy ===
−
Previous trigger configuration [https://halldweb.jlab.org/hdops/wiki/index.php/Level-1_Trigger_Shift here]
+
*  Run conditions approved by PAC and ERR
 +
** Electron beam energy: 12 GeV
 +
** Energy range of interest: 8 - 9 GeV,
 +
** Photon flux:  2·10<sup>7</sup> phot / sec
 +
* Reduction of the beam energy from 12 GeV to 10.8 GeV
 +
** R = N<sub>phot</sub> <sup> 12 GeV </sup> / N<sub>phot</sub> <sup> 10.8 GeV </sup>
 +
** R (0 - 8 GeV) = 1.17
 +
** R (0 - endpoint) = 1.2
 +
** R (8 - 9 GeV) = 2
 +
** R (8 - endpoint) = 1.93
 +
** For C and LHe4 runs the beam current was increased to 150 nA (by about 7%),  max approved by RadCon
 +
** Correction to the photon flux in the energy range of interest due to the beam energy change:  1.6 - 1.7
  
−
* Physics trigger
+
== Setting up photon beam ==
  
−
{|border
+
* [https://halldweb.jlab.org/wiki/index.php/Run_Coordination_Meetings:Fall2021 Verify electron beam quality and establish photon beam]
−
|-
+
−
!
+
−
! scope="column" | Trigger Type
+
−
! scope="column" | Trigger Bit (starting from 1)
+
−
|-
+
−
! Main Production trigger
+
−
! 0.7 FCAL + BCAL > 180 MeV  & SC
+
−
! 1
+
−
|-
+
−
!
+
−
! BCAL > 1.1 GeV
+
−
! 3
+
−
|-
+
−
! Luminosity
+
−
! PS
+
−
! 4
+
−
|}
+
  
−
* Monitoring triggers
 
  
−
{|border
+
== SRC production ==
−
|-
+
−
! scope="column" | Trigger Type
+
−
! scope="column" | Trigger Bit
+
−
|-
+
−
! FCAL LED
+
−
!
+
−
|-
+
−
! BCAL LED
+
−
!
+
−
|-
+
−
|-
+
−
! DIRC LED
+
−
! 
+
−
|-
+
−
! Random
+
−
! 
+
−
|}
+
  
−
==Detailed Activities==
+
* Standard configuration: Production on JD70-105 radiator. 2h runs <b>and no more, as it may be hard to correct for calibration drifts</b>. Cycle over 4 sets of runs: 0<sup>o</sup>, then 90<sup>o</sup>, then 45<sup>o</sup>, then 135<sup>o</sup>.
  
−
* Beam established following Hall D procuedures [https://halldweb.jlab.org/hdops/wiki/index.php/Primer_for_shift_takers]
 
  
−
=== Prior to beam activities ===
+
==Trigger Types==
−
 
+
−
Estimated time (3-4  Shifts: 1 Day)
+
−
 
+
−
*  With Radcon support, Hall D techs uncable and remove start counter from cryostat
+
−
*  With Radcon support, Target Group secures target gas, inerts the target piping, and bleeds vacuum chamber to atmospheric pressure
+
−
*  With Radcon support, Target Group removes foam portion of cryostat
+
−
*  With Radcon support, Target Group removes foam portion of cryostat
+
−
*  With Radcon support, Target Group removes superinsulation around target cell
+
−
*  With Radcon support, Target Group removes target cell
+
−
*  With Radcon support, Target Group mounts Carbon ladder in place of the gas cell
+
−
*  With Radcon support, Target Group, Foam portion of cryostat is put back in place, vacuum pumps on
+
−
*  With Radcon support, Hall D techs Start counter put back in place, cables attached
+
−
*  With Radcon support, Hall D techs Target inserted into solenoid
+
−
*  Survey adjusts position in solenoid
+
−
*  Hall D techs Beamline assembled and pump
+
−
*  Hall D techs Ramp up the magnet
+
−
 
+
−
=== Calibration before production runs ===
+
−
 
+
−
Estimated time (1 Shift)
+
−
 
+
−
* Establish typical tagged photon beam
+
−
* Harp scans for the electron Beam (and PS)
+
−
* Initial detector check out
+
−
* Equalize CCAL gains (calibrate CCAL)
+
−
* TAC run ??
+
−
 
+
−
=== DAQ checkout===
+
−
Lower DAQ thresholds for MIPs. Starting numbers from previous studies:
+
−
* E(BCAL)>180 MeV
+
−
* E(FCAL)>250 MeV
+
−
* 1 hit in start counter
+
−
* 78 kHz, 90% livetime, 1 GB/s
+
−
 
+
−
=== Luminosity Scan ===
+
−
 
+
−
* 1M(?) events runs with the following currents 30, 60, 90, 120, 150 nA
+
−
* Ideal Rate 80 kHz (91% livetime)
+
−
 
+
−
=== Production runs with Carbon ===
+
−
 
+
−
Run at nominal conditions for 20 days.
+
−
 
+
−
=== Production runs with 4He ===
+
−
 
+
−
# Loading the target
+
−
#*  With Radcon support, Hall D techs uncable and remove start counter from cryostat
+
−
#*  With Radcon support, Target Group secures target and bleeds vacuum chamber to atmospheric pressure
+
−
#*  With Radcon support, Target Group removes foam portion of cryostat
+
−
#*  With Radcon support, Target Group removes foam portion of cryostat
+
−
#*  With Radcon support, Target Group removes superinsulation around target cell
+
−
#*  With Radcon support, Target Group removes target cell
+
−
#*  With Radcon support, Target Group mounts LHe4 ladder in place of the carbon ladder
+
−
#*  With Radcon support, Target Group, Foam portion of cryostat is put back in place, vacuum pumps on
+
−
#*  With Radcon support, Hall D techs Start counter put back in place, cables attached
+
−
#*  With Radcon support, Hall D techs Target inserted into solenoid
+
−
#*  Survey adjusts position in solenoid
+
−
#*  Hall D techs Beamline assembled and pump
+
−
#*  Hall D techs Ramp up the magnet
+
−
# Detector and DAQ checkout
+
−
# Production run with 4He for 10 days
+
−
 
+
−
=== Empty Cell Runs ===
+
−
 
+
−
Estimated time (2 Shifts)
+
−
 
+
−
#*  Target group pumps out the LHe from the target cell.
+
−
#*  Target group bring up to room temperature.
+
−
#*  Target group pump out of the cell.
+
−
#  Runs with Empty Cell target (1 shift).
+
−
 
+
−
=== Production runs with D ===
+
−
 
+
−
#  Target group cool down the cell filled with liquid D (Estimated time 1-2 shifts)
+
−
#  Detector and DAQ checkout
+
−
# Production run with D for 8 days
+
−
 
+
−
=== Target swap to Cu ladder ===
+
−
 
+
−
Estimated time (3-4  Shifts: 1 Day)
+
−
 
+
−
*  With Radcon support, Hall D techs uncable and remove start counter from cryostat
+
−
*  With Radcon support, Target Group secures target gas, inerts the target piping, and bleeds vacuum chamber to atmospheric pressure
+
−
*  With Radcon support, Target Group removes foam portion of cryostat
+
−
*  With Radcon support, Target Group removes foam portion of cryostat
+
−
*  With Radcon support, Target Group removes superinsulation around target cell
+
−
*  With Radcon support, Target Group removes target cell
+
−
*  With Radcon support, Target Group mounts Carbon ladder in place of the gas cell
+
−
*  With Radcon support, Target Group, Foam portion of cryostat is put back in place, vacuum pumps on
+
−
*  With Radcon support, Hall D techs Start counter put back in place, cables attached
+
−
*  With Radcon support, Hall D techs Target inserted into solenoid
+
−
*  Survey adjusts position in solenoid
+
−
*  Hall D techs Beamline assembled and pump
+
−
*  Hall D techs Ramp up the magnet
+
−
 
+
−
=== Production runs with Cu ===
+
  
−
Run at nominal conditions for 10 days.
+
[https://halldweb.jlab.org/hdops/wiki/index.php/Level-1_Trigger_Shift_PrimEx List of triggers used in the SRC (page will be updated)]

Latest revision as of 08:56, 8 December 2021

Plan for 8 Nov-6 Dec

Note that shifts here correspond to accelerator shifts.

See visually here

The standard configuration of the GlueX detector will be used during the SRC run

Activity Time (shifts) Beam current (nA) Radiator (R.L.) Comment
Liquid He target
Tune beam to tagger hall 3
Ion chamber calibration
Radiation monitor check 		0.6
Harp scan for electron beam 0.2 Establish photon beam
Calib active collimator 0.5
Align JD70 - 105 radiator 1.5 4x10-4
Detector checkout, Trigger / DAQ tuning 3 10 - 150 same
Collect data in raw mode 0.1 10 - 150
Total 2.5 days
Production with 4He target
48 ( 12 days )
1
1 		150
150
50 		4x10-4
4.5x10-4 (AMO)
4x10-4

Insert CCAL, HV on for low-energy TAGH
Empty (He) target run 2
Target change to D 2.0
Production with D target 8 (2 days) 140
Insert CCAL, HV on for low-energy TAGH
TAC run (use CCAL as TAC) 2 shifts < 5 2x10-5 Empty liquid target
Target change to C
Ramp the solenoid magnet down
Install and align target
Ramp the magnet up
1.25
1.5
1.25
-
-
-
-
-
-
Production with C target 68 ( 17 days )
2 		150
50 		4x10-4
Insert CCAL, HV on for low-energy TAGH
Target change to D
Ramp the solenoid magnet down
Install and align target
Ramp the magnet up
1.25
1.5
1.25
-
-
-
-
-
-
Production with D target 24 (6 days) 140
Total 42 days

Possible detailed plan for C->D change (not finalized)

Monday (13th):
1900: Begin to ramp down solenoid

Tuesday (14th):
0300: Solenoid is ramped down, take straight track running, may need to optimize trigger for this
0700/0800: RadCon sweep, Hall in Controlled?
0800-1200: Survey and alignment of carbon foil target
1200-1700: Techs and Chris swap C target with D
1700-0100: Ramp solenoid, pump target
0100: Production D data

General Conditions

Item Polarized Beam
Beam Energy 10.9 GeV
Beam Current 140 nA
Active Collimator (Inner) optimal coordinates x = 0 mm, y = −0.2 mm (Will be updated)
BPM (IPM5C11B) optimal coordinates x = −0.5 mm, y = +1.0 mm
Tagger Quadrupole (MQPAD00) Current −4.2 A
Radiator JD70-105, 47 μm 4·10-4 R.L., 4.5·10 -4 R.L. AL radiator (30 µm Al), 2·10-5 R.L. AL
Coherent Peak Position 8.6 GeV
Beam Profiler retracted
Collimator 5.0 mm
Pair Converter Be 75 μm
Pair Spect. Magnet Current (set point) 850 A
GlueX Solenoid 1350 A
TAC retracted


Corrections to the photon flux due to the smaller beam energy

  • Run conditions approved by PAC and ERR
    • Electron beam energy: 12 GeV
    • Energy range of interest: 8 - 9 GeV,
    • Photon flux: 2·107 phot / sec
  • Reduction of the beam energy from 12 GeV to 10.8 GeV
    • R = Nphot 12 GeV / Nphot 10.8 GeV
    • R (0 - 8 GeV) = 1.17
    • R (0 - endpoint) = 1.2
    • R (8 - 9 GeV) = 2
    • R (8 - endpoint) = 1.93
    • For C and LHe4 runs the beam current was increased to 150 nA (by about 7%), max approved by RadCon
    • Correction to the photon flux in the energy range of interest due to the beam energy change: 1.6 - 1.7

Setting up photon beam


SRC production

  • Standard configuration: Production on JD70-105 radiator. 2h runs and no more, as it may be hard to correct for calibration drifts. Cycle over 4 sets of runs: 0o, then 90o, then 45o, then 135o.


Trigger Types

List of triggers used in the SRC (page will be updated)

Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=SRC/CT_Run_Plan&oldid=109505"