*********************** Odd info about PEP feedbacks: If you inject with the BIC, the feedback loops don't get their bucket numbers updated, so there is a chance that they are looking at a bucket with no beam. (When a DIAGLIST is executed, it updates a value in the BPMD that only the feedbacks care about.) You can check which bucket number the feedback BPM buffer ring is looking at by typing dbdump, then at the dbDump> prompt, typing: dump bpmd.vx00.24.prms (for LER single bunch*), or dump bpmd.vx00.14.prms (for HER single bunch*). The third number in the PRMS array is the bucket number that that BPMD is looking at. [* the HER/LER orbit loops look at the single bunch definitions, regardless of fill pattern] example: MCC::EOIC_DESK> dbdump dbDump>dump bpmd.vx00.24.prms BPMD:VX00,24 PRMS 10.00000 0.0000000E+00 123.00000 0.0000000E+00 0.0000000E+00 0.0000000E+00 dbDump> This tells you the LER single bunch BPMD is sampling bucket 123 for the feedback buffer rings. If there is no beam in the PRMS bucket, you can do one of two things to get it pointed to a good bucket number: (1) Execute a diaglist with a good bucket number in it (no need to actually inject beam, just execute the list. This will update PRMS and create new BPM buffers. You may need to wake the BIC up afterwards), or (2) editdbs bpmd.dbs (in the appropriate bpmd, force the prms value to be a good bucket) The mini-edit file will look something like: < :BPMD: VX00, 24; ! PEP2 BPM LER :PRMS: = 10.0, 0.0, 20.0, 0.0, 0.0, 0.0; ! ljh 20Jul98 need decreased avging; > then you need to Create BPM Bufferring and cold start the feedbacks. If the feedback MEAS still looks bad (but the numbers are no longer all zero) check the single bunch calibration (look for SAT and SUMLOW BPMS) and recalibrate if necessary.