Difference between revisions of "D2n kinematics"

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('High-level' sketch)
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= '''VERY''' rough sketch of updated d2n kinematics =
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= Run Plan (updated when needed) =
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* [https://docs.google.com/spreadsheets/d/1NCFehy_w7i-dfH9_Mgn403ec1e-D3Kqb1D2_muhI8FM/edit?usp=sharing Draft d2n Run Plan]
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 +
 
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= Rough / High-level sketch of d2n kinematic settings =
  
 
Reduced kinematics list to accommodate limited beam time (dropped 1/4 of kinematics)
 
Reduced kinematics list to accommodate limited beam time (dropped 1/4 of kinematics)
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   A    4.2  13.5    0.207    2.414  3.178
 
   A    4.2  13.5    0.207    2.414  3.178
 
   B    4.2  16.4    0.305    3.554  2.993
 
   B    4.2  16.4    0.305    3.554  2.993
   C    4.0  20.0    0.418    5.018  2.806
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   C    4.0  20.0    0.418    5.018  2.806   --  Only setting compatible with SOLID Cherenkov small-angle test.
  
 
           --------- SHMS ----------
 
           --------- SHMS ----------
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* '''Not shown is the 1-pass running''' (2'ish days)
 
* '''Not shown is the 1-pass running''' (2'ish days)
  
== 'High-level' sketch ==
+
== Schedule Overview ==
 
* We should expect to have '''6 weeks of beam'''
 
* We should expect to have '''6 weeks of beam'''
 
** Hall C will have priority over Hall A (if there are beam loading, machine stability issues)
 
** Hall C will have priority over Hall A (if there are beam loading, machine stability issues)
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# Then move to kin A and Z (high-Q2 SHMS, small angle HMS)
 
# Then move to kin A and Z (high-Q2 SHMS, small angle HMS)
 
# Scheduling of Kin B, Y and 1-pass running would depend on how the Accel/target/virus behaves
 
# Scheduling of Kin B, Y and 1-pass running would depend on how the Accel/target/virus behaves
 
== More detailed run plan (draft) ==
 
* [https://docs.google.com/spreadsheets/d/1NCFehy_w7i-dfH9_Mgn403ec1e-D3Kqb1D2_muhI8FM/edit?usp=sharing Draft d2n Run Plan]
 
  
 
== Non-production runs ==
 
== Non-production runs ==

Revision as of 14:28, 21 May 2020

Run Plan (updated when needed)


Rough / High-level sketch of d2n kinematic settings

Reduced kinematics list to accommodate limited beam time (dropped 1/4 of kinematics)

      ---------  Beam Params ----------
            E_beam = 10.4 GeV/c
            I_beam = 30 uA
            P_targ = 0.50
            P_beam = 0.80
          ---------  HMS ----------
       E'    theta    x        Q2       W
 A     4.2   13.5     0.207    2.414   3.178
 B     4.2   16.4     0.305    3.554   2.993
 C     4.0   20.0     0.418    5.018   2.806    --  Only setting compatible with SOLID Cherenkov small-angle test.
          --------- SHMS ----------
       E'    theta    x       Q2      W
 X     7.5   11.0     0.527   2.866   1.859
 Y     6.4   14.5     0.565   4.240   2.036
 Z     5.6   18.0     0.633   5.701   2.046


  • Not shown is the 1-pass running (2'ish days)

Schedule Overview

  • We should expect to have 6 weeks of beam
    • Hall C will have priority over Hall A (if there are beam loading, machine stability issues)
  • Rough priorities:
  1. We plan to start at 5-pass with kinematics A and X (small angle)
    We will start at 5-pass with kinematics C and X (small angle on SHMS, large angle on HMS)
    • This will allow the SOLID Cerenkov prototype folks to setup before beam and run their small-angle test on the HMS side.
  2. Then move to kin A and Z (high-Q2 SHMS, small angle HMS)
  3. Scheduling of Kin B, Y and 1-pass running would depend on how the Accel/target/virus behaves

Non-production runs

  • Confirm we have all the optics we need!
    • Analyze and get the new matrices in the analyzer
    • Make sure we have empty target runs for all kinematics and all optics configurations to help disentangle beamline window contributions
  • Nail down estimates for ref cell running (N2, H2, 3He, empty)
  • Minimal/no positron running?
      • Perhaps measure the positron background in HMS at 20 degree and compare with model?