Difference between revisions of "Photon Beam Commissioning Discussion Aug 20, 2014"

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(→‎Minutes)
 
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== Action Items ==
 
== Action Items ==
  
−
* Send Todd a geometry of tagger area, including the mapped tagger magnet field, for GEANT simulations (Richard). Richard is working to update the defined geometry based on [http://zeus.phys.uconn.edu/halld/tagger/tagger_vault.pdf a drawing received from Tim], Richard will add field map from Dan Sober
+
* <strike> Send Todd a geometry of tagger area, including the mapped tagger magnet field, for GEANT simulations (Richard). Richard is working to update the defined geometry based on [http://zeus.phys.uconn.edu/halld/tagger/tagger_vault.pdf a drawing received from Tim], Richard will add field map from Dan Sober </strike>
 
* Estimate rates and ranges of parameters needed for the photon beam tuning (Todd for accelerator; Elton, Hovanes, Eugene, Alexandre for Hall D)
 
* Estimate rates and ranges of parameters needed for the photon beam tuning (Todd for accelerator; Elton, Hovanes, Eugene, Alexandre for Hall D)
 
** Need rates for profiler, start counter, ps
 
** Need rates for profiler, start counter, ps
 +
* Richard will provide a "sacrificial" board with 30 SiPMs to register neutron damage during initial electron beam tune.
 +
* Hovanes is preparing photomultipliers that can be used to measure beam loss along the beamline.
 +
* <strike> Alexandre will meet with RadCon next week to coordinate details of accessing monitor information </strike>
  
 
== Agenda ==
 
== Agenda ==
 
# Announcements
 
# Announcements
 
# Recommendations from [http://www.jlab.org/Hall-D/halld_secure/reviews/ERR_HallD_Jul2014/Final_Report_HallD_Experiment_Readiness_Review.pdf ERR Report]
 
# Recommendations from [http://www.jlab.org/Hall-D/halld_secure/reviews/ERR_HallD_Jul2014/Final_Report_HallD_Experiment_Readiness_Review.pdf ERR Report]
−
#* Notes beyond ongoing efforts:
+
# Aug 8 Photon Beam Commissioning Review [http://www.jlab.org/Hall-D/halld_secure/reviews/PhotonBeamCommissioning_Internal_Aug2014/Final_Report/ReportonPhotonBeamCommissioning.pdf Final Report]
−
#* p2 5b) "...strong suggestion by the committee to install several beam loss monitors inside Hall D proper"
+
# ARR presentations
−
#* p5 third paragraph proposes "The installation of a few sacrificial SiPMs in the Tagger hodoscope during the remaining beam transport commissioning activities, at the start of the next beam operations period..."
+
# Accelerator and Hall D Interface Document - needs to be finalized.
−
#* p7 first bullet: "Setup and tuning of photon beam into the experimental area along with monitoring of background and radiation levels. The latter has to be continuously available and cannot rely on the start of the DAQ system."
+
−
#* p8 under slow controls: "...concerned about... the motor control commissioning... Specific recommendation: Implement limit switches and/or hardware to avoid movable collimator completely out."
+
−
# Debrief Aug 8 Review:
+
−
#* [http://www.jlab.org/Hall-D/halld_secure/reviews/PhotonBeamCommissioning_Internal_Aug2014/ Photon Beam Commissioning Review Page]
+
−
#* [http://www.jlab.org/Hall-D/halld_secure/reviews/PhotonBeamCommissioning_Internal_Aug2014/Final_Report/ReportonPhotonBeamCommissioning.pdf Final Report]
+
−
#* [[Media:Moteabbed thesis p55-p56.pdf]] Description of TPE photon profile monitor
+
−
#* Comments / to-do-list for ARR
+
−
#* ARR presentations
+
−
# [https://halldweb1.jlab.org/wiki/index.php/Specification_for_12_GeV_electron_beam_and_associated_instrumentation Electron Beam Specifications]
+
−
#* Need signed document?
+
−
#* Accelerator and Hall D Interface Document - needs to be finalized.
+
−
# Update on Electron Commissioning (Todd/Mike)
+
−
#*Monitoring of photon beam dump?
+
−
#*Populating Operational Restrictions [http://opsweb.acc.jlab.org/internal/ops/ops_webpage/restrictions/ops_restrictions.html]
+
 
# Update on Photon Commissioning (Alexandre)
 
# Update on Photon Commissioning (Alexandre)
−
#* Version for the ARR
+
# [[Beam Simulations]]
−
# Update Radiation monitors and controls (George/Pavel)
+
# RadCon update
 
# Other business
 
# Other business
  
 
== Minutes ==
 
== Minutes ==
  
−
''Attending:
+
''Attending: Elton, Eugene, Tim, Hovanes, Alexandre (Hall D); George, Pavel (RadCon); Michael (Ops); Todd (CASA); Curtis (CMU); Richard (Uconn).
 +
 
 +
# Announcements
 +
## Accelerator Meeting
 +
##* Eugene, Alexandre, Todd attended a meeting to discuss the upcoming running
 +
##* This fall running at 500 MHz: 5.5 passes Hall D; 4 passes Hall A; 1 pass Hall B.
 +
##* Accepted extension of first beam delivery by four days to accommodate initial photon beam commissioning before 6 day of shutdown.
 +
##* Resume running after shutdown with delivery to other halls. Hall D retains priority for the next 3 weeks of operation
 +
##* Beyond the 3 weeks, accelerator has a varied program but could deliver beam to Hall D on evenings and weekends.
 +
##* Break at Thanksgiving, followed by other Accelerator programs with beam availability on evenings and weekends till Dec 22. Hall D would retain priority but if not running Hall A could receive 5 pass beam.
 +
##* Beam delivery to Hall B for HPS will be during evenings and weekends to allow for CLAS12 installation during the day.
 +
##* Briefly discussed spring running. No changes to nominal plan for 8 weeks of running.
 +
# ARR presentations
 +
# Tagger Hall Geometry
 +
#* Richard, Elton and Chuck had a phone conference on Friday to review input to the simulation.
 +
#* Most of the geometry was specified, but there remain some uncertainties especially related to shielding that has not yet been installed.
 +
#* Chuck should update the layout in the tagger hall when he returns next week.
 +
#* Discussion of "virtual" volumes to record particle fluxes.
 +
#* Pavel: Suggest setup large planes along the wall and at the focal plane below the beamline.
 +
#* Alexandre: Add detectors at the positions of the radiation detectors for comparison with measurements. See [http://www.jlab.org/Hall-D/halld_secure/reviews/PhotonBeamCommissioning_Internal_Aug2014/Pre-Brief_Materials/rad_mon_fall14.pdf rad_mon_fall14.pdf]
 +
#* Richard has setup a page that describes the setup of the simulation at [[Beam Simulations]]
 +
#* Output is in the form of PAW ntuples.
 +
#* Final geometry will await precise determination of shielding to be installed in the hall. However, the present configuration should be valuable as a first step in determining radiation levels.
 +
# Recommendations from [http://www.jlab.org/Hall-D/halld_secure/reviews/ERR_HallD_Jul2014/Final_Report_HallD_Experiment_Readiness_Review.pdf ERR Report]
 +
# Aug 8 Photon Beam Commissioning Review [http://www.jlab.org/Hall-D/halld_secure/reviews/PhotonBeamCommissioning_Internal_Aug2014/Final_Report/ReportonPhotonBeamCommissioning.pdf Final Report]
 +
# Accelerator and Hall D Interface Document
 +
#* Elton circulated an updated draft (v10) based on v9 from accelerator.
 +
#* Feedback received from Michael, Tim and Hovanes. A new version (v11) will be based on Michaels edits, since they are the largest number.
 +
#* Elton will circulate the updated version for additional comments.
 +
# Update on Photon Commissioning (Alexandre and Eugene)
 +
#* The plan is being flushed out and discussed in broad strokes.
 +
#* Some feedback was given on the organization.
 +
# RadCon update
 +
#* RSAD is almost finalized. There was some discussion regarding the limit to 200 nA of cw beam. It was decided that this if fine for the fall running.
 +
#* Tasks are being entered into the ATlist for parasitic measurements of radiation doses for different Hall D beam configurations.
 +
# Other business
 +
#* Next meeting in 2 weeks: Sep 3, 4 pm.

Latest revision as of 09:14, 21 August 2014

Organization

  • Time: 4 pm EST
  • Connecting: detailed instructions are here
  • Conference id: 536076821

References

Action Items

  • Send Todd a geometry of tagger area, including the mapped tagger magnet field, for GEANT simulations (Richard). Richard is working to update the defined geometry based on a drawing received from Tim, Richard will add field map from Dan Sober
  • Estimate rates and ranges of parameters needed for the photon beam tuning (Todd for accelerator; Elton, Hovanes, Eugene, Alexandre for Hall D)
    • Need rates for profiler, start counter, ps
  • Richard will provide a "sacrificial" board with 30 SiPMs to register neutron damage during initial electron beam tune.
  • Hovanes is preparing photomultipliers that can be used to measure beam loss along the beamline.
  • Alexandre will meet with RadCon next week to coordinate details of accessing monitor information

Agenda

  1. Announcements
  2. Recommendations from ERR Report
  3. Aug 8 Photon Beam Commissioning Review Final Report
  4. ARR presentations
  5. Accelerator and Hall D Interface Document - needs to be finalized.
  6. Update on Photon Commissioning (Alexandre)
  7. Beam Simulations
  8. RadCon update
  9. Other business

Minutes

Attending: Elton, Eugene, Tim, Hovanes, Alexandre (Hall D); George, Pavel (RadCon); Michael (Ops); Todd (CASA); Curtis (CMU); Richard (Uconn).

  1. Announcements
    1. Accelerator Meeting
      • Eugene, Alexandre, Todd attended a meeting to discuss the upcoming running
      • This fall running at 500 MHz: 5.5 passes Hall D; 4 passes Hall A; 1 pass Hall B.
      • Accepted extension of first beam delivery by four days to accommodate initial photon beam commissioning before 6 day of shutdown.
      • Resume running after shutdown with delivery to other halls. Hall D retains priority for the next 3 weeks of operation
      • Beyond the 3 weeks, accelerator has a varied program but could deliver beam to Hall D on evenings and weekends.
      • Break at Thanksgiving, followed by other Accelerator programs with beam availability on evenings and weekends till Dec 22. Hall D would retain priority but if not running Hall A could receive 5 pass beam.
      • Beam delivery to Hall B for HPS will be during evenings and weekends to allow for CLAS12 installation during the day.
      • Briefly discussed spring running. No changes to nominal plan for 8 weeks of running.
  2. ARR presentations
  3. Tagger Hall Geometry
    • Richard, Elton and Chuck had a phone conference on Friday to review input to the simulation.
    • Most of the geometry was specified, but there remain some uncertainties especially related to shielding that has not yet been installed.
    • Chuck should update the layout in the tagger hall when he returns next week.
    • Discussion of "virtual" volumes to record particle fluxes.
    • Pavel: Suggest setup large planes along the wall and at the focal plane below the beamline.
    • Alexandre: Add detectors at the positions of the radiation detectors for comparison with measurements. See rad_mon_fall14.pdf
    • Richard has setup a page that describes the setup of the simulation at Beam Simulations
    • Output is in the form of PAW ntuples.
    • Final geometry will await precise determination of shielding to be installed in the hall. However, the present configuration should be valuable as a first step in determining radiation levels.
  4. Recommendations from ERR Report
  5. Aug 8 Photon Beam Commissioning Review Final Report
  6. Accelerator and Hall D Interface Document
    • Elton circulated an updated draft (v10) based on v9 from accelerator.
    • Feedback received from Michael, Tim and Hovanes. A new version (v11) will be based on Michaels edits, since they are the largest number.
    • Elton will circulate the updated version for additional comments.
  7. Update on Photon Commissioning (Alexandre and Eugene)
    • The plan is being flushed out and discussed in broad strokes.
    • Some feedback was given on the organization.
  8. RadCon update
    • RSAD is almost finalized. There was some discussion regarding the limit to 200 nA of cw beam. It was decided that this if fine for the fall running.
    • Tasks are being entered into the ATlist for parasitic measurements of radiation doses for different Hall D beam configurations.
  9. Other business
    • Next meeting in 2 weeks: Sep 3, 4 pm.
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