Parity Checks

In the process of editing and updating this page. Please contact Juliette Mammei crowder@jlab.org with questions or suggestions.

PREX Main<< Information for Shift Takers << Shift Checklist

In general, you can try to search for things in JMenu (next to the magnifying glass, where compton is written in Figure 1) to see if they will come up. The instructions below tell you one way to navigate through the menus to get to the desired screen (there may be other ways to get there).

Variable	IHWPin	IHWPout
VWein
Solenoid
HWein

Figure 1 - Main JMenu window.

Figure 2 - PGUN Main window in JMenu.

Figure 3 - Spin Controls window.

Figure 4 - RTP cell window.

Figure 5 - Parity Controls window.

• Insertable half-wave plate (IHWP) Setting (IN or OUT)
  • In JMenu, mouse over "Injector" (see Figure 1)
  • In the dropdown menu, choose "GUN/Laser"
  • From there, choose "PGUN Main"
  • The setting is indicated by the depressed button (see Figure 2, very bottom left corner, it is OUT in this figure)
• Rotatable half-wave plate (RHWP) setting (value like 1532)
  • Right next to the IHWP box in the PGUN window is the set value of the RHWP (1532 in Figure 1)

• Wien settings (FLIP RIGHT or LEFT, or LONG)
  • From JMenu, mouse over "Injector"
  • In the dropdown menu, choose "Spin", then "Spin Controls"
  • The FLIP LEFT or RIGHT or Longitudinal (see Figure 3, very top - middle region, it is "Longitudinal" in this figure)
• Vertical Wien Angle (degrees)
  • The variable is VWienAngle
  • Find it at the bottom of the left box of the spin controls window
  • The value is -0.00 in Figure 3
• Solenoid angle (degrees)
  • The variable is Phi_FG
  • Find it at the bottom of the middle box of the spin controls window
  • The value is 86.901 in Figure 3
• Horizontal Wien Angle (degrees)
  • The variable is HWienAngle
  • Find it at the bottom of the right box of the spin controls window
  • The value is -0.00 in Figure 3

• RTP settings
  • From JMenu, in search frame, type ""RTP""
  • In the dropdown menu, choose ""RTP cell""
  • The ON/OFF button is in the pink region on the top right
• Main RTP Cell ON/OFF
  • This should always be ON
  • The voltage values are in the light purple region on the right
• VL/4 (counts)
  • The variable is ""Quarter-Wave-Voltage""
  • The value is always 12670
  • It should always be the case that VL/4=VL/41=VL/42
• VPITA (counts)
  • The variable is ""PITA Voltage""
  • The value should be fluctuating by a few hundred counts but should be -2000 < PITA Voltage < 2000
  • It should always be the case that VPITA=VPITA,1=VPITA,2
• VaPos,U(counts)
  • The variable is ""Alpha-Pos-U""
  • The value should be fixed and for IHWPout it should be 1509. For IHWPin it should be 889.
• VaPos,V(counts)
  • The variable is ""Alpha-Pos-V""
  • The value should be fixed and for IHWPout it should be 337. For IHWPin it should be -552.
• VdPos,U(counts)
  • The variable is ""Delta-Pos-U"" and should always be 0
• VdPos,V(counts)
  • The variable is ""Delta-Pos-V"" and should always be 0

• IA settings
  • From JMenu, in the search frame, type ""Parity""
  • In the dropdown menu, choose ""Parity Controls""
  • The IA settings for the 3 halls are in the bottom half of the screen in the tan, grey, and light purple sections
• HALL A:IA
  • The Variable is ""HallA IA voltage"
  • It is located in the bottom left tan region in the blue boxes next to "COUNTS READ" under DAC03
  • DAC03, DAC04,DAC05,DAC06 should all read identical values
  • For IHWPout, HallAIA should be 42570. For IHWPin, HallAIA should be 26046
  • The Variable is ""HallB IA voltage"
  • It is located in the bottom center grey region in the blue boxes next to "COUNTS READ" under DAC07
  • DAC07, DAC08,DAC09,DAC10 should all read identical values
  • For IHWPout, HallBIA should be 37286. For IHWPin, HallBIA should be 29353
  • The Variable is ""HallC IA voltage"
  • It is located in the bottom right light purple region in the blue boxes next to "COUNTS READ" under DAC11
  • DAC11, DAC12,DAC13,DAC14 should all read identical values
  • For IHWPout, HallCIA should be fluctuating (+-100 to 1000counts) around 25881. For IHWPin, HallCIA should be fluctuating around 42264.

• Table
  • IHWP out / IHWP in
  • ON/OFF

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