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Documentation
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Daily RC Meetings/Run Plan

Welcome to the SBS Shifters Wiki!

The purpose of this Wiki is to organize information relevant to the running experiment and is intended to be the "one stop shop" for all things shift-related. This includes things like run plans, shift sign up, safety, How Tos, important links, concise documentation of equipment (single page of key information for a subsystem encouraged) as well as trouble-shooting and data quality information. Information not directly relevant to shifters should be stored elsewhere such as the SuperBigBite Wiki. For more information, see the GEn-RP webpage or the SBS website.

SBS Shift Information

If you are on shift and the DAQ is not working, go to Fixing the SBS DAQ

Daily Run Plans

Daily run plans are linked to the calendar for the Daily RC Meetings Page 

 Time: Daily at 3:30pm
 Location:   Counting house conference room
 Zoom information to join remotely

GEp kinematic table

SBS GEP Kinematics Table (including parameters relevant for simulation)
Name GEP-1 GEP-2 GEP-2a GEP-3 GEP-3mod
(aka GEP-0)
Beam Energy (GeV) 6.476 8.588 4.359 10.688 10.688
SBS angle (deg) 25.7 22.1 28.5 16.9 18.6
Central/nominal Q^2 (GeV^2) 5.732 8.127 3.860 12.039 11.109
ECAL angle (deg) 29.46 27.27 35.0 29.75 27.0
ECAL distance (m) 8.0 6.0 5.0 4.7 6.0
SBS distance (m) 1.6 1.6 1.6 1.6 1.6
HCAL distance (m) 10.0 10.0 10.0 10.0 10.0
Central proton momentum (GeV) 3.881 5.185 2.845 7.294 6.794
Central electron energy (GeV) 3.422 4.257 2.302 4.273 4.768
SBS magnetic field (% of maximum) 53 71 39 100 93.1
SBS BdL (T*m, central ray) 1.28 1.71 0.94 2.41 2.243
SBS current setting (A, (% of maximum)) 851.3 (40.53%) 1158.4 (55.16%) 624.3 (29.73%) 2100 (100%) 1762.2 (83.9%)
Central precession angle (deg, rough) 43.7 57.7 32.8 80.5 74.4
epsilon 0.733 0.720 0.691 0.616 0.676
P_T -0.068 -0.044 -0.114 -0.029 0.001
P_L 0.674 0.692 0.707 0.787 0.737

Notes on the kinematics table (April 16, 2025)

  • Nominal magnetic field settings are for nominal production data taking (optimizing acceptance/event rate). Some fraction of the data may be taken at other field settings to study systematics of SBS optics and spin precession. In particular, some fraction of the GEP-2a and/or GEP-1 data may be taken at the higher field settings relevant for GEP-2/GEP-3
  • Central precession angle is calculated from central proton momentum and central field integral.
  • HCAL distance of 10 meters is assumed for all settings. It may be desirable to put HCAL slightly closer for the low-Q^2 settings, but coverage of the useful acceptance seems good even for those settings.
  • Central kinematics (Q^2, proton momentum, scattered electron energy, etc) are calculated using the beam energy and the central SBS angle. The central ECAL angle may differ slightly for GEP-2a from the angle implied by the central proton kinematics and the beam energy. Need to check acceptance matching and vacuum snout aperture on ECAL side.
  • For the modified highest-Q^2 point, I may have used a slightly different form factor ratio parametrization that happens to cross zero earlier to calculate the values of PT and PL

Archived Information (for GMn and GEn and GEn-RP/KLL)

SBS Software/Analysis information

SBS Software/GMN analysis meeting agendas and minutes

Student Analysis

How to investigate helicity analysis issues

GEP software meeting agendas/minutes

Useful links

If you need it, here is a link to the old wiki

Here is the SBS DAQ Meeting page in the old wiki.

GeN safety documentation: [1]

Conference Talks

If a student would like to give a talk at a conference, email the relevant spokespeople before submitting an abstract.

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