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
+
| 0.2
−
| 140 nA
+
|
 +
|
 +
| Establish photon beam
 
|-
 
|-
−
| Compton running for density checks
+
| Calib active collimator
−
| 1 shift
+
| 0.5
 +
|
 +
|
 +
|
 +
|-
 +
| Align JD70 - 105 radiator
 +
|1.5
 +
|
 +
| 4x10<sup>-4</sup>
 +
|
 +
|-
 +
| Detector checkout, Trigger / DAQ tuning
 +
| 3
 +
| 10 - 150
 +
| same
 +
|
 +
|-
 +
| Collect data in raw mode
 +
| 0.1
 +
| 10 - 150
 +
|
 +
|
 +
|-
 +
| Total
 +
| 2.5 days
 +
|
 +
|
 
|  
 
|  
 
|-
 
|-
−
| Target change to 4He
+
| <span style="color:blue"> Production with 4He target </span> <br />
−
| 5 shifts
+
| 48 ( 12 days )  <br />  1 <br /> 1
 +
| 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
 +
|-
 +
| <span style="color:blue"> Empty (He) target run </span>
 +
| 2
 +
|
 +
|
 
|  
 
|  
 
|-
 
|-
−
| Compton running for density checks
+
| <span style="color:red"> Target change to D </span>
−
| 1-2 shift
+
| 2.0
 +
|
 +
|
 
|  
 
|  
 
|-
 
|-
−
| Run with 4He
+
| <span style="color:blue"> Production with D target </span>
−
| 10 days
+
| 8 (2 days) 
−
| 140 nA
+
| 140  
 +
|
 +
| <br /> Insert CCAL, HV on for low-energy TAGH
 
|-
 
|-
−
| Empty Cell Run
+
| TAC run (use CCAL as TAC)
−
| 1 shift
+
| 2 shifts
−
| 140 nA
+
| < 5
 +
| 2x10<sup>-5</sup>
 +
| Empty liquid target
 
|-
 
|-
−
| Target change to D
+
| <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
−
| 3 shifts
+
| <br /> 1.25  <br /> 1.5                <br /> 1.25
 +
| <br />  -  <br />  -                  <br />  -
 +
| <br />  -  <br />  -                  <br />  -
 
|  
 
|  
 
|-
 
|-
−
| Run D
+
| <span style="color:blue"> Production with C target </span>
−
| 8 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 Cu
+
| <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 />  -
 
|  
 
|  
 
|-
 
|-
−
| Run with Cu
+
| <span style="color:blue"> Production with D target </span>
−
| 10 days
+
| 24 (6 days) 
−
| 140 nA
+
| 140  
 +
|
 +
|
 +
|
 +
|-
 +
| Total
 +
| 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 78: 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 88: 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 99: 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 ===
 +
*  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 ==
  
 +
* [https://halldweb.jlab.org/wiki/index.php/Run_Coordination_Meetings:Fall2021 Verify electron beam quality and establish photon beam]
  
−
{|border="1" cellpadding="5" cellspacing="0" align="center"
 
−
|-
 
−
!
 
−
! scope="column" | Trigger Type
 
−
! scope="column" | Trigger Bit (starting from 1)
 
−
|-
 
−
! Main Production trigger
 
−
! FCAL + 0.5 BCAL > 0.5 GeV  & ST
 
−
! 1
 
−
|-
 
−
!
 
−
! BCAL > 1.1 GeV
 
−
! 3
 
−
|-
 
−
! Luminosity
 
−
! PS
 
−
! 4
 
−
|}
 
  
 +
== SRC production ==
  
−
==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>.
  
−
=== 1. Prior to beam activities ===
 
  
−
Estimated time (3 -4  Shifts: 1 Day)
+
==Trigger Types==
−
 
+
−
*  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
+
−
 
+
−
=== 2. Calibration before production runs  ===
+
−
 
+
−
* Establish typical tagged photon beam
+
−
* Harp scans for the electron Beam (and PS)
+
−
* Initial detector check out
+
−
* Equalize CCAL gains (calibrate CCAL)
+
−
* TAC run
+
−
 
+
−
===Loading Liquid Targets===
+
−
 
+
−
{| class="wikitable"
+
−
|- style="font-weight:bold;"
+
−
!
+
−
! Contact
+
−
! Details
+
−
|-
+
−
| Disassemble beam pipe<br />Retract target<br />Remove ST<br />Remove Gluex Cell
+
−
|
+
−
|
+
−
|-
+
−
| Mount target cell <br /> Mount heat shield
+
−
|
+
−
|
+
−
|-
+
−
| Survey
+
−
|
+
−
|
+
−
|-
+
−
| Attach vacuum snout<br />Attach ST<br />Target in place<br />Assemble beam pipe<br />Pump vacuum in the target ladder<br />
+
−
|
+
−
|
+
−
|-
+
−
| Ramp Magnet up <br />
+
−
|
+
−
|
+
−
|}
+
−
 
+
−
===Loading Solid Targets===
+
−
 
+
−
{| class="wikitable"
+
−
|- style="font-weight:bold;"
+
−
!
+
−
! Contact
+
−
! Details
+
−
|-
+
−
| Disassemble beam pipe<br />Retract target<br />Remove ST<br />Remove Gluex Cell
+
−
|
+
−
|
+
−
|-
+
−
| Mount C foil ladder
+
−
|
+
−
|
+
−
|-
+
−
| Survey
+
−
|
+
−
|
+
−
|-
+
−
| Attach vacuum snout<br />Attach ST<br />Target in place<br />Assemble beam pipe<br />Pump vacuum in the target ladder<br />
+
−
|
+
−
|
+
−
|-
+
−
| Ramp Magnet up <br />
+
−
|
+
−
|
+
−
|}
+
−
 
+
−
=== DAQ checkout===
+
−
 
+
−
=== Beamline calibrations and checkout===
+
−
 
+
−
=== Detectors checkout ===
+
−
 
+
−
=== Luminosity Scan===
+
  
−
=== Empty Cell Runs===
+
[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"