Production Run Plan R-HRS

From Hall A Wiki
Revision as of 16:26, 12 April 2016 by Vasulk (Talk | contribs) (→‎Proton Elastic Kinematics)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Proton Elastic Kinematics

* If you need to increase the spectrometer momentum setting, make sure you cycle Q2 and Q3 as per the cycling procedure.
* Elastic electron rates assume 20 μA on 15 cm LH2 target, 5 mSr acceptance.
* Use the following prescale factors: ps1=1, ps2=1, ps3=1, ps8=100. All other triggers should have zero prescale factor.
* For the optics pointing run, decrease the spectrometer momentum to 0.85 GeV/c.  The right dipole will need about 1.5 hours to settle.
* Take one hour on the optics target.
* After the optics run is completed, then increase the spectrometer momentum back to the elastic setting.  
 
  Make sure to cycle the right Q2 and Q3 when increasing the momentum.
* The 15 cm dummy runs need to be taken at the elastic setting.  So keep the momentum as is for this run. 
* A GMp expert will check the data quality.


  • 5th Pass (Ebeam = 11.0 GeV) Time estimate: 39 days @ 20 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 20 μA PAC days at 20 μA
15 cm LH2 2 x 2 mm2 11.021 2.204 48.74 16.54 0.003 38 (for 10k events)
Optics Off 11.021 0.85 48.74 6.38 4.4 1 hour (for 16k events)
15 cm Dummy 2 x 2 mm2 11.021 2.204 48.74 16.54 ---- 1 hour


  • 4th Pass (Ebeam = 8.8 GeV) Time estimate: 22 days @ 20 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 20 μA PAC days at 20 μA
15 cm LH2 2 x 2 mm2 8.841 2.101 48.74 12.65 0.018 21 (for 32k events)
Optics Off 8.841 0.85 48.74 5.12 4.9 1 hour (for 17k events)
15 cm Dummy 2 x 2 mm2 8.841 2.101 48.74 12.65 ---- 1 hour


  • 2nd Pass (Ebeam = 4.5 GeV) Time estimate: 7 hours @ 20 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 20 μA PAC hours at 20 μA
15 cm LH2 2 x 2 mm2 4.481 1.706 48.75 5.21 2.4 4 (for 35k events)
15 cm Dummy 2 x 2 mm2 4.481 1.706 48.75 5.21 0.4 2.5 (for 3.6k events)


  • 2nd Pass (Ebeam = 4.5 GeV) Time estimate: 12 hours @ 20 μA
Target Raster Ebeam [GeV] P0 [GeV/c] θe [deg] Q2 [GeV2] Electron Rate [Hz] at 20 μA PAC hours at 20 μA
15 cm LH2 2 x 2 mm2 4.481 1.547 52.91 5.5 1.4 7 (for 35k events)
Optics Off 4.481 1.547 52.91 5.5 0.23 0.5 (for 400 events)
Optics% Off 4.481 0.85 52.91 3.0 4.2 at 10 μA 0.5 (for 7.5k events)
at 10 μA
15 cm Dummy# 2 x 2 mm2 4.481 1.547 52.91 5.5 0.26 4 (for 3.7k events) 
% Alternative kinematics for pointing run.
# Take Al dummy data only if time permits.


Retrieved from "https://hallaweb.jlab.org/wiki/index.php?title=Production_Run_Plan_R-HRS&oldid=28809"