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    User name M.Olson

    Log entry time 01:48:34 on July 8,2007

    Entry number 207983

    keyword=Q2=25 Kinematic point set, notes on setting Left Q3

    We have set conditions for the Q2=25 point:

    E' = 0.5605
    Angle = 97.70

    P_r = 0.4641
    Angle 34.67

    New trigger values entered (E' = 560.5, P_r = 928.2)
    HV's for Right VDC's set to 3.5 kV
    HV's of S1 R_HRS set to 70% of max. value and verified

    *** Notes:

    Right Q1 would not find set momentum on its own. I adjusted the current by hand to obtain the desired value of 0.4641 GeV/c

    Left Q3 was set using Javier's procedure (halog 207711)

    Reference momentum taken from Q2=40: P_40 = 0.5279 GeV/c
    Reference field taken from Q2=40: B_40 = -.10453 T
    Reference current taken from Q2=40: I_40 = 715.27 A

    New momentum for Q2=25: P_25 = 0.5605 GeV/c

    New field for Q2=25: B_new = (P_25/P_40) * B_40 = -0.11099 T (Target)

    New current (initial): I_new = (P_25/P_40) * I_40 = 759.44 A

    This was entered into DAC and a field of -0.11118 T was generated.

    Corrected current: I_corr = (-.11099/-.11118) * 759.44 A = 758.14 A

    Corrected current entered into DAC and the field generated was equal to B_new = -0.11099 T, which was the target field for Q2=25