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    User name M.Shabestari

    Log entry time 08:09:02 on April26,2008

    Entry number 234726

    keyword=Owl Shift Summary

    Owl shift summary April 26, 2008

    SL : Mitra Shabestari
    TO : Mitra Shabestari
    3rd : Khem Chirapatpimol


    Summary
    ========

    pi0 Production : Kinematics K Part(III)

    BigBite = 43.6 degrees, BigBite current = 390.0 A (setpoint); 388.1 A (readback)
    LHRS = 14.5 degrees, LHRS momentum = 0.9770 GeV/c
    RHRS = 105.0 degrees, RHRS momentum = 0.4596 GeV/c

    Target: 6 cm LH2 in loop1


    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    00:00 Shift started. Run# 3916 has already started.
    Beam tripped at the beginning of the shift and following the beam trip all HVs tripped. Stopped the run. We got all HVs back on, and strated taking production data.

    00:01 ----> Run# 20766 ; started Right HRS..... events = 256 K

    00:08 ----> Run# 3917 ; events = 1 M

    00:17 ----> Run# 3918 ; events = 911 K.....HV trip

    00:25 ----> Run# 3919 ; events = 6 K.....HV lost connection to the client, and when it came back there was no HV setting.
    We had to load the file "BB_apr_08_2008_12:22.set". The ramp up and ramp down speed on wire chambers was 500 V/s by default. Set it back to 10 V/s before turnning the HV on.

    00:36 ----> Run# 3920 ; events = 1 M

    00:44 ----> Run# 3921 ; events = 1 M

    00:53 ----> Run# 3922 ; events = 1 M

    01:03 ----> Run# 3923 ; events = 1 M

    01:11 ----> Run# 3924 ; events = 1 M

    01:19 ----> Run# 3925 ; events = 1 M

    01:28 ----> Run# 3926 ; events = 1 M

    01:36 ----> Run# 3927 ; events = 1 M

    01:44 ----> Run# 3928 ; events = 1 M

    01:53 ----> Run# 3929 ; events = 1 M

    02:01 ----> Run# 3930 ; events = 1 M

    02:10 ----> Run# 3931 ; events = 1 M

    02:18 ----> Run# 3932 ; events = 1 M

    02:27 ----> Run# 3933 ; events = 153 K.....HV lost connection to the client again.

    02:33 ----> Run# 3934 ; events = 1 M

    02:43 ----> Run# 3935 ; events = 1 M

    02:43 ----> Run# 20767 ; started Right HRS..... events = 245 K

    02:50 ----> Run# 3936 ; events = 1 M

    02:58 ----> Run# 3937 ; events = 1 M

    03:07 ----> Run# 3938 ; events = 1 M

    03:15 ----> Run# 3939 ; events = 1 M

    03:24 ----> Run# 3940 ; events = 1 M

    03:33 ----> Run# 3941 ; events = 1 M

    03:41 ----> Run# 3942 ; events = 1 M

    03:50 ----> Run# 3943 ; events = 1 M

    03:59 ----> Run# 3944 ; events = 1 M

    04:07 ----> Run# 3945 ; events = 1 M

    04:16 ----> Run# 3946 ; events = 1 M

    04:25 ----> Run# 3947 ; events = 1 M

    04:34 ----> Run# 3948 ; events = 1 M

    04:42 ----> Run# 3949 ; events = 1 M

    04:51 ----> Run# 3950 ; events = 1 M

    04:59 ----> Run# 3951 ; events = 1 M

    05:07 ----> Run# 3952 ; events = 1 M

    05:16 ----> Run# 3953 ; events = 1 M

    05:18 ----> Run# 20768 ; started Right HRS..... events = 157 K

    05:26 ----> Run# 3954 ; events = 1 M

    05:35 ----> Run# 3955 ; events = 1 M.....Asked MCC for current reduction from 4 uA to 3.5 uA.
    Deadtime decreased from 23% to 16%

    05:45 ----> Run# 3956 ; events = 1 M

    05:53 ----> Run# 3957 ; events = 1 M

    06:03 ----> Run# 3958 ; events = 1 M

    06:18 ----> Run# 3959 ; events = 1 M

    06:28 ----> Run# 3960 ; events = 1 M

    06:38 ----> Run# 3961 ; events = 1 M

    06:48 ----> Run# 3962 ; events = 1 M

    06:57 ----> Run# 3963 ; events = 1 M

    07:04 ----> Run# 20769 ; started Right HRS..... The "Start_Run_20769" is missing from HALOG!
    It seems that it's combined with the previous run's end, i.e., "End_of_Run_20768".

    07:06 ----> Run# 3964 ; events = 1 M

    07:20 ----> Run# 3965 ; events = 1 M

    07:30 ----> Run# 3966 ; events = 1 M

    07:40 ----> Run# 3967 ; events = 1 M

    07:49 ----> Run# 3968 ; events = 1 M

    07:58 ----> Run# 3969 ; events = 1 M




    Beam enery was 1192.38 MeV.
    For the current kinematics ( K ) at the end of the owl shift: Total Charge = 0.231 C