Eugene,
My attachments came through name "filenam13" and "filenam14" so
maybe that is some of the confusion on which plots are with field.
d) That spike in L1, L2 and R1 (no field) looks to be in about the
right spot for the pedestal. If you plot those ADC channels without the
cut on the corresponding TDC, is the pedestal spike in the same
location? But cutting on the TDC should show you which box actually had a
signal larger than the discriminator threshold. Try cutting on atl<4095
(full-scale on the TDC) as well as atl>0, or at least plot the TDC, or TDC
vs ADC, to see what is going on.
a) To figure out R0 and R2 with no field, someone needs to look with a
scope at the signal going to the ADC, be sure there is no DC offset ( you
won't do that from Arizona, of course). I don't know why the offset would
go away with the field on, though. Probably worth plotting the TDCs for
these, also.
b) As for the Left side practically disappearing when the field is
turned on -- the trigger hardware has been changed to OR the Cerenkovs
before the MLU. I installed the cable for the left on Monday (11/10),
which I believe is AFTER your no-field run, BEFORE the field run. So I
will go and check the cable again.
c) Maybe R1 signal doesn't attenuate as much as R0, R2 with the field
on, so more events pass the discriminator.
Karen
At 01:45 AM 11/13/2003 -0700, Eugene J. Geis wrote:
>Hello,
>
> >
> > You need to explain what these plots are. I, for one, cannot read the
> > sub-microscopic print in the title box. And while ROOT allows you to
> > expand that box, gv does so only at the expense of not being able to
> > see
> > the rest of the plot.
>
>I apologize for my inability to be specific,
>
>When I sent the postscripts, I wrote:
>"I have crunched the two cosmic runs and plotted the adc's in the Cherenkovs."
>These two cosmic runs are 3288 (no field) and 3310 (full field)
>
>repeating verbatim:
>I have 'plotted the ADC's in the Cherenkovs.' Cosmic.ps is full field, and
>Cosmic_no_Field.ps is self-explanatory. I, for one, do not know how to open
>postscripts in ROOT... I only use gv and the zoom works fine for me. To
>be more
>specific about the layout:
>
>----------------------------------------------------
>| | |
>| ADC of Cher | ADC of Cher |
>| L-0 | R-0 |
>| | |
>|---------------------------------------------------
>| | |
>| ADC of Cher | ADC of Cher |
>| L-1 | R-1 |
>| | |
>|---------------------------------------------------
>| | |
>| ADC of Cher | ADC of Cher |
>| L-2 | R-2 |
>| | |
>|---------------------------------------------------
>
>This is the layout of the plots. Note that all of the events in the upper and
>lower right-hand spectra are pedestals and NONE of the events were recorded
>where the "real" spectra 'should' be. When field is off, the "real" spectra
>would actually fall through ~channel 4000. This can be seen in the left-hand
>side, otherwise known as CC L0, CC L1, and CC L2. It is also apparent in
>CC R1
>which is the right-hand middle plot. Notice in the second file, otherwise
>known
>as Cosmic.ps (with full field on), that all signature of the typical ADC
>spectra
>disappears and now we find that CC R0 and CC R2 (the upper and lower
>right-hand
>plots) have reappeared in all their fine splendor. The only conclusion
>that can
>confidently be drawn is the comparison of CC R1_No_Field with CC R1_Full_Field
>where we notice that there is a severe change in width when the field is
>on. We
>also notice when calculating efficiencies from previous H2 runs with no field
>that the respective Cherenkov efficiency for R1 falls by ~35% when field
>is on.
> We have nearly 100% efficiency with field off. Cosmics will give a greater
>proof of this change in the ADC spectra once it is consistently measured twice
>with field on and then field off... That means, to be more specific, all
>ADCs of
>all Cherenkovs firing consistently. Until then, I still have these questions
>about these Cosmic runs and ONLY these Cosmic runs...
>
>a. I have no idea why R0 and R2 look the way they do with No field... There
>should be "real" spectra, not just pedestals...
>
>b. Why did the left side barely fire at all with field on?? Is it
>something with
>the trigger???
>
>c. Why does R1 have such an asymmetric number of hits when compared to R0 and
>R2, namely, 310k events as compared to 57k and 70k, never mind the petite
>hundreds of events in the left CC's?
>
>d. What is that strange peak in the ADC of L1, L2, and R1 in the no
>field postscript? We do not understand what this peak may be.
>
>Thanks for the love,
>eugene
>
>
>
>--------------------------------------------------------------------------
>Eugene Geis
>PhD Student, Physics Department, ASU
>Research Affiliate, MIT-Bates Laboratory of Nuclear Science
>eugene.geis@asu.edu
>--------------------------------------------------------------------------
>-------------------------------water is good------------------------------
>--------------------------------------------------------------------------
>** Check Out the Phatty Acidz @ www.phattyacidz.com **
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:30 EST