Difference between revisions of "Main Page"

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|<big><span style="color:red">Security Guards: 757-269-5822</span></big>
 
|<big><span style="color:red">Security Guards: 757-269-5822</span></big>
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| [[Contact_Information | SBS Contact Information]]
 
 
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| [[Subsystem_Expert_Contacts | Subsystem Expert Contact Info]]
 
| [[Subsystem_Expert_Contacts | Subsystem Expert Contact Info]]
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| [[Contact_Information | SBS Contact Information]]
 
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| [[Hall A Phone Book | Hall A Phone Book]]
 
| [[Hall A Phone Book | Hall A Phone Book]]
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|[[SBS_Shifters_Wiki_Info |  SBS Shifters Wiki Info]]
 
|[[SBS_Shifters_Wiki_Info |  SBS Shifters Wiki Info]]
 
|-
 
|-
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|[https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=SBS-GEn-2022 Shift Schedule]
+
|[https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=GEp-V Shift Schedule]
 
|-
 
|-
 
|[[Documentation]]
 
|[[Documentation]]
 
|-
 
|-
 
| [[HOW TOs | HOW TOs for shift crew]]
 
| [[HOW TOs | HOW TOs for shift crew]]
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|-
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<!--|-
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| [[Expert Tools]]
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| [[Expert Tools]] -->
 
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|[[Daily_Meetings#RC_Meetings | Daily RC Meetings/Run Plan]]
 
|[[Daily_Meetings#RC_Meetings | Daily RC Meetings/Run Plan]]
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Welcome to the <big>SBS Shifters Wiki</big>!
 
Welcome to the <big>SBS Shifters Wiki</big>!
  
−
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 [https://hallaweb.jlab.org/wiki/index.php/SuperBigBite SuperBigBite Wiki]. For more information, see the [https://hallaweb.jlab.org/experiment/SBS/GEn/GEn_Website.html GEn] webpage or the [https://hallaweb.jlab.org/12GeV/SuperBigBite SBS] website.
+
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 [https://hallaweb.jlab.org/wiki/index.php/SuperBigBite SuperBigBite Wiki]. For more information, see the [https://hallaweb.jlab.org/experiment/SBS/GEn-RP/GEn-RP_Website.html GEn-RP] webpage or the [https://hallaweb.jlab.org/12GeV/SuperBigBite SBS] website.
  
 
==SBS Shift Information==
 
==SBS Shift Information==
 
<p style="font-size:30px"> If you are on shift and the DAQ is not working, go to [[Fixing the SBS DAQ]] </p>
 
<p style="font-size:30px"> If you are on shift and the DAQ is not working, go to [[Fixing the SBS DAQ]] </p>
−
* [https://sbs.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=269 GEn Safety documents (ERG, ESAD, COO, SAF110)]
+
*[https://hallaweb.jlab.org/experiment/SBS/GEp-V/GEp_Website.html#genrpsafety Safety documents]
−
* [https://sbs.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=270 GEn RSAD]
+
 
* [[Shift Takers]]
 
* [[Shift Takers]]
 
* [https://sbs.jlab.org/wiki/index.php/HOW_TOs Shift How-to]
 
* [https://sbs.jlab.org/wiki/index.php/HOW_TOs Shift How-to]
 
* [[Run Coordinators]]
 
* [[Run Coordinators]]
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* [[https://redmine.jlab.org/projects/gmn-running/wiki/Google_drive_run_list Runlist (restricted)]]
 
−
* [https://docs.google.com/spreadsheets/d/16gUMKGlzJhLkvmEe0IESWGNvLk61f5oSgCEm9EWqKMk/edit?usp=sharing GEn runs spreadsheet]
 
 
* [https://hallcweb.jlab.org/live_status/ All Halls Status and Phone numbers]
 
* [https://hallcweb.jlab.org/live_status/ All Halls Status and Phone numbers]
−
* [https://docs.google.com/spreadsheets/d/1yrLxeiYP6-mdEcAh5gL-xMAp31fRchQDqJ8EcD3E7YY/edit?usp=sharing GMn runs spreadsheet] (old)
+
 
 
<!--
 
<!--
 
<big><span style="color:red"><u>Short term run plan (11/23 - 11/24)</u></span></big> <br>
 
<big><span style="color:red"><u>Short term run plan (11/23 - 11/24)</u></span></big> <br>
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-->
 
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* [https://sbs.jlab.org/wiki/index.php/Subsystem_Expert_Contacts Sub-system Experts (On Call)]
 
* [https://sbs.jlab.org/wiki/index.php/Subsystem_Expert_Contacts Sub-system Experts (On Call)]
 +
* [https://hallaweb.jlab.org/experiment/SBS/GEp-V/GEp_Website.html GEp-V experiment (Web)]
 +
** [https://sbs.jlab.org/wiki/index.php/Daily_Meetings GEp-V RC Daily meetings]
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** [https://sbs.jlab.org/wiki/index.php/GEP-V_run_plans GEp-V Run Plans]
 +
** [https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=GEp-V GEp-V Shift Schedule]
 +
** [https://docs.google.com/spreadsheets/d/1G49e26ZHH8fNhpvK2XlgGtei94XF0viT3iykOviHT98/edit?gid=43955465#gid=43955465 GEp runs spreadsheet]
  
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==GEn Physics==
+
==Daily Run Plans==
−
The GEn experiment is determining the electric form factor of the neutron to high Q<sup>2</sup> by measuring the ratio of the electric form factor of the neutron to proton via recoil polarimetry. The planned kinematic points have changed slightly from the original proposal; however, the impact of these measurements remains intact. The new kinematics are shown Figure 1 along with the expected uncertainty compared to the originally proposed kinematics. These error bars include current estimate of target and datector performance.
+
  
−
[[File:GEnProjection.png|600px|Right|Figure 1. Expected results of GEn at the planned kinematics along with projected uncertainties.]]
+
Daily run plans are linked to the calendar for the [[Daily_Meetings |<b>Daily RC Meetings Page</b>]]
 +
  Time: Mon/Wed at 1:00pm, Tue/Thur/Fri at 1:30pm
 +
  Location:  Counting house conference room
 +
  [https://sbs.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=431 Zoom information to join remotely]
  
−
==Large Scope Run Plans==
+
==GEp kinematic table==
−
[[:File:GEN runplan Sept15.pdf|GEn Detailed Run Plan (PDF)]]
+
  
−
[[:File:GEnKinematicsSpreadsheet.xlsx|GEn Kinematics Spreadsheet (Excel)]]
+
{| class="wikitable"
−
 
+
|+ SBS GEP Kinematics Table (including parameters relevant for simulation)
−
The proposed kinematic points for GEn are given here in Figures 2-4.
+
|-
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{|table
+
! Name !! GEP-1 !! GEP-2 !! GEP-2a !! GEP-3 !! GEP-3mod
−
|[[File:GEn2.9.png|250px|thumb|Figure 2. Details for Q<sup>2</sup>=2.9 GeV<sup>2</sup>]]
+
|-
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|[[File:GEn6.6.png|252px|thumb|Figure 3. Details for Q<sup>2</sup>=6.6 GeV<sup>2</sup>]]
+
! !! !! !! (aka GEP-0) !!  !!
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|[[File:GEn9.7.png|266px|thumb|Figure 4. Details for Q<sup>2</sup>=9.7 GeV<sup>2</sup>]]
+
|-
 +
| 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
 
|}
 
|}
−
* [[CommissioningPlan | Commissioning Plan]]
 
  
−
* [[Run_Plan_for_2-pass_Setup]]
+
===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
  
−
* [[Run_Plan_for_3-pass_Setup]]
+
==Archived Information (for GMn and GEn and GEn-RP/K<sub>LL</sub>)==
  
−
* [[Run_Plan_for_4-pass_Setup]]
+
* [https://hallaweb.jlab.org/experiment/SBS/GEn-RP/GEn-RP_Website.html GEn-RP-K<sub>LL</sub> experiment (Web)]
 +
* [https://sbs.jlab.org/wiki/index.php/Daily_Meetings GEn-RP-K<sub>LL</sub> RC Daily meetings]
 +
* [https://sbs.jlab.org/wiki/index.php/GEN-RP_KLL_run_plans GEn-RP-K<sub>LL</sub> Run Plans]
 +
* [https://sbs.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=269 GEn Safety documents (ERG, ESAD, COO, SAF110)]
 +
* [https://sbs.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=270 GEn RSAD]
 +
* [[https://redmine.jlab.org/projects/gmn-running/wiki/Google_drive_run_list Runlist (restricted)]]
 +
* [https://docs.google.com/spreadsheets/d/16gUMKGlzJhLkvmEe0IESWGNvLk61f5oSgCEm9EWqKMk/edit?usp=sharing GEn runs spreadsheet]
 +
* [https://docs.google.com/spreadsheets/d/1yrLxeiYP6-mdEcAh5gL-xMAp31fRchQDqJ8EcD3E7YY/edit?usp=sharing GMn runs spreadsheet] (old)
 +
* [[GEn Run Plans | GEn Run Plans]](old)
 +
* [[GMn Run Plans | GMn Run Plans]](old)
 +
* [[GMn_Daily_Run_Plans | GMn Daily RC Meetings and Run Plans]](old)
  
−
[[GMn Run Plans | GMn Run Plans]](old)
+
==SBS Software/Analysis information==
−
 
+
−
==Daily Run Plans==
+
−
 
+
−
Daily run plans are linked to the calendar for the [[Daily_Meetings |<b>Daily RC Meetings Page</b>]]
+
−
  Time: Daily at 3:30pm
+
−
  Location:  Counting house conference room
+
−
  [https://sbs.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=431 Zoom information to join remotely]
+
  
−
[[GMn_Daily_Run_Plans | GMn Daily RC Meetings and Run Plans]](old)
+
[[SBS Software/GMN analysis meeting agendas and minutes]]
  
−
==SBS Software/Analysis information==
+
[https://redmine.jlab.org/projects/sbs-analysis/wiki Student Analysis]
  
−
[[SBS Software/GMN analysis meeting agendas and minutes]]
+
[[How to investigate helicity analysis issues]]
  
−
[[Student Analysis]]
+
[[GEP software meeting agendas/minutes]]
  
 
==Useful links==
 
==Useful links==

Latest revision as of 17:34, 4 May 2025

RC phone: 757-876-1787
Security Guards: 757-269-5822
Subsystem Expert Contact Info
SBS Contact Information
Hall A Phone Book
SBS Shifters Wiki Info
Shift Schedule
Documentation
HOW TOs for shift crew
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: Mon/Wed at 1:00pm, Tue/Thur/Fri at 1:30pm
 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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