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    Log entry time 07:41:58 on February 1,2011

    Entry number 346013

    keyword=HAND summery 29-31-Jan-2011

    Bad PMT:

    1)

    A bad PMT was reported (by 3 people) on the left side of bar number 22 on the veto (i.e. V22L).

    On monday it was tested again and apears to be working fine.


    2)
    2 more PMTs were found to be loose on layers 5.
    These ware checked at the hall before HAND moved into the basket and was mounted on the stand.
    The tape is holding them fine and we get normal signals from them.

    it have been decided that NO REPAIR ACTIONS WILL BE TAKEN.



    Nu-Metals:

    The new plated have been cut, rolled, and are now mounted on BB.
    Moshe is reinforcing them and making sure we get the best coverage possible.


    Gain Maching Runs:

    Layer 4:
    Runs 60139(Base volttage) - 60143(Base voltage+175V) using bars 1,3,5,7,9,11 as trigger
    Runs 60144(Base voltage+175V), 60148(Base voltage+150V) - 60151(Base Voltage) using bars 2,4,6,8,10,12 as trigger

    Notes:
    1) HV files are keps under igor/hv_calib
    2) Runs 60143 & 60144 have been rejected (voltage too high for proper analysis).
    3) use only the first 90,000 events of run 60151.
    4) The voltage jumps from the (arbitrary chosen) base voltage are: +50, +100, +150, +175.



    Common stop polarity:

    The polarity of the common stop signal was reversed - making us stop on the trailing edge and not the leading edge.
    This is now fixed.



    Double TDC peak when runing high voltage:

    When runing in high HV (see run number 60143, layer 4 right) there are secondary peaks in the TDC spectrum.

    There are some possible explenations for this (reflactions etc) - we will updae after we check it.