Re: many, many TOFr trips

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From: Frank Geurts (geurts_at_rice.edu)
Date: Fri Mar 21 2003 - 15:13:23 EST

W.J. Llope wrote:
>
> attached are two PDFs from the rich scalers. TOFr seems to
> be tripping "for no reason".... (hence frank's reboot/reramp)....
>
> red is pVPD .and. rate (Hz)
> green if TOFr singles (Hz)
>
> picture 5 shows full range (these are perfectly normal
> spills and single rates)
> picture 7 is the same but w/ an expanded Y-axis
>
> i.e. these trips happen both w/ and w/out beam in the ring.
> also the currents are at perfectly normal values ~1 minute
> before each trip....
>
> it's always HVA- that's going here...

actually, it's HVA+ that always craps out.

Since the reboot we have seen another 7 trips. However, Vernier scans
are and lots of beam tuning is done and we can see rather "high"
currents on the HVA busses (high meaning only 50nA instead of <10nA).

On the other hand, we have had Vernier scans before without these
massive trips. Typically, i have never seen the supply trip while in the
last stage of the ramp, but now i do see it happen a rather frequently.

-f.

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