• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name Moffit

    Log entry time 02:33:22 on July24,2003

    Entry number 106425

    keyword=HAPPEX Lumi HV setup

    Took some runs to increase the HV on the PMT for the HAPPEX Lumi1. This lumi is roughly a half meter from the beam pipe between the two HRS.

    Conclusion: Can run the HV for this lumi at -1500 (Chan. 10, Beamline (e,p) & ARC)... for I <= 1uA. Return it to -1300 when running at higher current.

    Summary of runs:


    L1 is the Lumi1 signal in ADC channels over pedestal.

    3586:
    Raster OFF 130-150nA. Multi-foil Target
    0->12000 HV1 = -1300 L1 = 780
    13000->End HV1 = -1500 L1 = 3000

    3587:
    Raster OFF 150nA. Single-foil Target
    0->End HV1 = -1500 L1 = 2500

    3588:
    Raster OFF 1 µA. Multi-foil Target
    0->10000 HV1 = -1300 L1 = 5600
    11000->End HV1 = -1500 L1 = 22410

    3589:
    Raster OFF 1 µA. Single-foil Target
    0->10000 HV1 = -1300 L1 = 4710
    11000->End HV1 = -1500 L1 = 18380

    3590:
    Raster ON 1 µA. Multi-foil Target
    0->End HV1 = -1500 L1 = 23430