Record of Parity Settings

From PREX Wiki
Revision as of 15:41, 2 September 2019 by Caryn Palatchi (Talk | contribs)

Jump to: navigation, search
  • Prior to July 10, solenoid angle was incorrect by 3 degrees https://logbooks.jlab.org/entry/3702542
  • July 10 evening - after Run 3143 - solenoid angle fixed by injector group (was 89deg, put at 91.2deg)
  • July 11 morning- after Run 3175- Table changed to also have solenoid =91.2 (for VWein 88deg) in addition to having solenoid =86deg (for VWein -89deg)
  • changed the AposU and AposV voltages july18th,attached picture is a history of what we had until this day in Figure 5
Figure 5 - Parity Controls window old.
















  • July24 start of swing: Spin dance performed and HWien angle setting changed from -15.5deg to -13deg.
  • July 31 documenting the settings before attempted 10nm move : up through slug23.
Table 1 - List of the correct settings for Insertable Half Wave Plate (IHWP) IN and OUT / Wien Flip RIGHT and LEFT.
Variable IHWPout IHWPout IHWPin IHWPin
Flip State FLIP-RIGHT FLIP-LEFT FLIP-RIGHT FLIP-LEFT
RHWP 1 1 1 1
VWien Angle +88° -89.9° +88° -89.9°
Solenoid Angle 91.19° 86.901° 91.19° 86.901°
HWien Angle -13° -13° -13° -13°
PC ON/OFF ON ON ON ON
V PITA 303 ± 1000 counts 303 ± 1000 counts -970 ± 1000 counts -970 ± 1000 counts
V L/4 12670 12670 12670 12670
V aposU 1447 1447 768 768
V aposV 163 163 -385 -385
V dposV 0 0 0 0
V dposU 0 0 0 0
HallA IA 42570 42570 26046 26046
HallB IA 37286 37286 29353 29353
HallC IA 23000 ± 2000 counts 23000 ± 2000 counts 38000 ± 2000 counts 38000 ± 2000 counts
  • Aug 1, slug 24 and 25. After 1 run in slug 24, changed AposV to try to cancel position differences. https://logbooks.jlab.org/entry/3713312. IHWPin: AposV=-385 --> want delta -20nm = +400counts --> new AposV =15. IHWPout: AposV=163 --> want delta +20nm = -400counts --> new AposV =-237
  • For slugs 26 -65 used above nominal AposU/V settings: IHWPin: AposU/V=768/-385,AposU/V=1147/163
  • Aug 25, starting with slug66-slug71, implemented the following change:
    • IHWPin: AposU/V=768/-385 ---> new AposU/V=685/-678 (change AposU by -83 counts, change AposV by -293counts)
    • IHWPout: AposU/V=1147/163 ---> new AposU/V=1176/465 (change AposU by +29 counts, change AposV by +302counts)
  • Aug27, starting with slug 72, implemented:
    • IHWPin: AposU/V=685/-678
    • IHWPout: AposU/V=1176/465---> new AposU/V=1205/767 (change AposU by +29 counts, change AposV by +302counts)
  • Aug29, starting with slug 74, implemented:
    • IHWPin: AposU/V=685/-678 ---> AposU/V=768/-385 (change AposU by +83 counts, change AposV by +293counts)
    • IHWPout: AposU/V=1205/767
  • attempt to change slug 78 failed
  • Sep2, starting with slug 79, implemented:
    • IHWPin: AposU/V=768/-385 ---> AposU/V= 528-1264 (change AposU by -3*83 counts, change AposV by -3*293counts)
    • IHWPout: AposU/V=1205/767 ---> AposU/V=1292/1673 (change AposU by +2*29 counts, change AposV by +2*302counts)