Indeed the beam left FASTBUS power supply was missing the 5V.
Connected up the spare supply. Now the ROC boots. Waiting for beam to
make sure we haven't got other problems with the TDCs or ADCs.
WARNING -- the replacement crate is on the floor behind the rack. Open
the door from the South Hall to the D Tunnel carefully, so you don't hit
the supply.
Karen
Douglas Hasell wrote:
>
> Early part of shift just taking data with half wavelength plate alternately
> in or out, running with ABS, toroid at 3000 A, and Compton polarimeter on.
>
> 19:00 - Compton Polarimeter DAQ repeatedly dies and decided not to struggle
> with it any more after consulting with Tancredi.
>
> 21:00 - problems with CODA not talking to ROCF2. Cycle power but doesn't
> help, called Karen and was able to reboot via serial port, and ROC back and
> able to restart CODA.
>
> 21:30 - wire chambers noisy in recent runs so decided to try optimising
> slits and bump. Run immediately after optimising shows wire chambers much
> improved; quiet and clean tracks. However, later runs have noise again. Is
> it space charge, bad beam tune, or low toroid field. No chance to
> investigate as other problems develop.
>
> 22:30 - can't communicate with ROCF2 again. Can't connect via serial port.
> Power cycling does not help. Notice that 5 V power is not present. Call
> Karen again and she will come in to look at it and possibly swap power
> supplies. Call CCR and ask for the hall to be opened (need elevator and D
> tunnel open). Toroid and ABS magnets being powered down as well.
>
> Cheers,
> Douglas
>
> 26-415 M.I.T. Tel: +1 617 258 7199
> 77 Massachusetts Avenue Fax: +1 617 258 5440
> Cambridge, MA 02139, USA E-mail: hasell@mit.edu
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