From: W.J. Llope (llope_at_physics.rice.edu)
Date: Sat May 03 2003 - 20:48:59 EDT
pvpd singles scalers firing.
local trigger is firing, non-strobe evts seen...
so we're o.k. now i think. huzzah
but this is wierd. (frank let's chat about this monday if
you're around?)...
have a good wknd...
On Sat, 3 May 2003, Frank Geurts wrote:
>
> Bill, I think that these two problems (pvpd and dma) are very likely to
> be related:
> if the pvpd is not functioning then it is very likely that there won't
> be any signals on its ADCs (which are part of the TOFp group). We have
> seen before that we get DMA errors in such case because of the way the
> Q-scan mode deals with those channels. The fact that you only see strobe
> events and no single scalers at all makes all this point to the pvpd ...
> so i powercycled both CAMAC crates and the pVPD LV supply, restarted
> tofpdaq. Geary is pretty sure that the pVPD HV was switched on this
> morning ... let's see what the next rhic fill brings us ...
>
>
>
>
> W.J. Llope wrote:
> > (localmon_to4123046.dat)
> >
> > Found 0 beam events out of 31356 >>--> ratio = 0
> >
> > -> all strobe events.
> >
> > pVPD singles scalers all zero too.
> >
> > either:
> > we lost the pVPD LV supply,
> > or
> > we lost both pVPD FEE boards
> > or
> > the shift crew neglected to power up
> > the pVPD HV during the STAR power-up...
> >
> > geary could you check w/ the shift crew on this?
> >
> >
> > clearly there's no way i can answer frank's question
> > (re: the DMA errors) w/ only these strobe events...
> > anyway, the pedestals look o.k....
> >
> >
> >
>
>
--
_________________________________________________________
W.J. Llope, Ph.D. Res. Assoc. Professor
http://wjllope.rice.edu/default.html
llope_at_physics.rice.edu
T.W. Bonner Nuclear Lab.
Rice University, MS-315
6100 S. Main phone: 713-348-4741
Houston, TX 77005-1892 fax: 713-348-5215
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