hi doug,
the three runs, 3329-31 lasted from 3:36-6:36 am. each plot was only
one sector. my naive interpretation is that the chambers were working
well at the beginning, and there is a peak at around 18 hits, and
another at 0 hits. then the peaks rise due to noise (space charge effect?).
--chris
Douglas Hasell wrote:
> Hi Chris,
>
> I suppose I am a bit confused by your plots. I see what I
> assume to be about 6 fills. The fills are characterised by a lot of
> events with only a few hits in the wire chambers which then as the
> fill progresses increases to reach stable values around 18 and 36 hits
> which correspond to one or two track events. To interpret this one
> could think that the chambers were collecting data as they were turned
> on. ie triggers were coming in while the WC HV was being ramped so we
> are inefficient at the beginning but this should only take 10-20
> seconds. What is the time scale for your plot? The other conclusion
> could be that the initial part of the fill is noisy and after a while
> the halo or X-rays from a high current in the gas target are reduced
> and the chamber behaves as it should.
>
> --On Monday, February 10, 2003 5:04 PM -0500 Chris Crawford
> <chris2@lns.mit.edu> wrote:
>
>> hi,
>> these graphs may be usefull in determining cuts on "nwl,nwr". they
>> are
>> the number of hits on left/right as a function of time (entry #) over
>> three runs 3329,30,31. these were hydrogen runs taken in the last
>> day or
>> so, right inbetween deuterium runs. doug, does this look consistent
>> with what you would expect? --chris
>
>
>
>
> 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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