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    User name xqian

    Log entry time 05:55:29 on January13,2009

    Entry number 255746

    keyword=HV Crate Problem!!!

    HV crate problem.

    We try to run the current to 13uA with N2 reference cell.

    The luminosity is similar to the 3He cell.

    The ROC9 is not rebooting itself as we saw before.

    This means the splitting of the cables are helpful.

    However, the HV crate start to lost connection with the HVGUI. This happened a couple times this morning and it can only recover when the beam current is lower. This becomes our limiting factor, The bbps1:2001 which contain all the shower blocks is the crate first lost connection to the HVGUI at high current. We need to investigate this? Anybody have ideas?