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    User name brads

    Log entry time 19:58:29 on May 20, 2008

    Entry number 238977

    keyword=Brief Controlled Access to look at BB Cerenkov gas system

    Since we were waiting for beam while MCC tuned up Hall C Jack and I went down to look at the Cerenkov gas system. Turns out that the float valve that regulates the pressure is disabled by the BB fringe field.

    BB was ramped down briefly while we worked then I ramped it back up to 700A.

    We moved the valve and associated gear just under the 3-step stairs on the RHRS. It's out of the way and cable-tied pretty securely, but watch the gas lines (for the Cerenkov and the MWDC), etc when you move BB.