Privacy and Security Notice

Privacy and Security Notice

Privacy and Security Notice

Jlab Experiment E01-006: Resonances Spin Structure (RSS)

The experiment was run at Thomas Jefferson National Accelerator Facility




  Conferences and talks

 Mailing List Archives    (Nicer version of Mailing archive on UVa Spin computer)

(to join mailing list send email to and write  subscribe e01006_analysis in body of message)

Minutes of the RSS meetings.

Reports and Run Lists 
Safety and Procedural Information 
Analysis Software 
Shift Schedule 

for your convenience:
Hall C Online Logbook

 If you are off-site, you'll need the password! Call (757) 269-6666 if you don't know it.

         List of upcoming conferences

 Reports and Run Lists

Target documents
 Target and other stuff in beam composition tables Target Information   Cryogenic Control of the Gen01 Polarized Target
Collaboration documents
  Presentations at the Nov. 16, 2001 RSS collaboration meeting 
Hardware documents
  Scaler Channel Map (postscript), July 26 version
Run plans
  Rolf's HMS commissioning run plan  Run plan for RSS Details of Run plan for RSS

 Shift Schedule

Send email to entire collaboration
  Main Schedule Page     if you can't wait to swap, click here...     Check YOUR schedule!  



Collaboration List

Important Contacts in the Accelerator Division


Oscar Rondon (University of Virginia)
Mark Jones (Jefferson Lab)
12/c126   x7733 (pager 584-7733)

 Safety and Procedural Information for RSS (E01-006)

Jlab: Procedures for Experiments, Nuclear Physics Program

Online Documentation for Running Hall-C
Duties of RSS Shift Personnel

Cryogenic Control of the RSS Polarized Target
Duties of RSS Run Coordinator

 RSS Analysis Software

  1. After pass2a looked at the drift distance plots and realized that they were bad. The parameter files for the drift time-to-distance maps had changed from pass1.  Changes to drift maps.
  2. Put new hdriftmap.param_rss and hdc.param_rss in the /group/e01006/rss_replay/PARAM.
  3. Mark as junk the following runs 43409-10 ( dipole set wrong), 43342 ( Q3 tripped at end of run), 43307 ( part of calorimeter HV off).
  4. Modifed /group/e01006/rss_replay/Tests/trackeff.test to remove the cerenkov from the fideff tests. A cut on the calorimeter is included in the fideff test.
  5. In pass2a found that the elastic events peaked at W =938 MeV. MC showed that the elastic events peak at W=942 ( shift from 938 due to radiative tail). Sensitivity of W position to scattering angle is -7 MeV/mr, to scattered electron energy is -1.1 and to vertical beam position -.08%/mm . A change of -0.03 degrees to central angle will shift W peak 4 MeV, or change central momentum by -.08% or change vertical positions by 1mm.  Since change in angle is the smallest, decide to change hstheta from 13.15 to 13.12 in /group/e01006/rss_replay/DBASE/rss.kinematics .
  6. After introducing a phi dependence to the target field for the perpendicular orientation, to correct the W vs X' ( vertical angle) correlation, it was necessary to have a shift in the electron momentum by 0.42% to have the elastic W peak at 938 MeV. This offset is arbitrary, becuase it depends are how we introduce the correction to the W vs X' correlation. This shift was done in the ENGINE by setting central momentum , hpcentral_offset, to zero for perp target field. For parallel target field,  hpcentral_offset = -0.42% which has been determined by other experiment in Hall C. For the next pass decide to set shift by offsetting delta and leaving the hpcentral_offset = -0.42% for perp target field. To implement change: Commented out the parameter hdelta_offset in PARAM/gconstants.param.01 and moved hdelta_offset to DBASE/rss.database . For perp target field runs set hdelta_offset = +0.42%.
  7. Updated SRC_other/trg_track.f to use B_scale = 5.003/(5.003+abs(B_corr))  instead of B_scale = 5.003/(5.003+B_corr).
  8. Update INC/hms_data_structures.cmn and SRC_hms/h_ntuple_init.f , h_ntuple_keep.f  and h_physics.f to calculate kinematics variables needed for calculation of A1 and A2. See note.
  9.  SRC_hms/h_physics.f changed to use "targloss" for the energy loss of scattered electron and use "hseloss" for Ebeam -Escat. Before there was a bug and hseloss was used for both.

(jones) Sept-17-2002