Hi Peter,
Just to use the same convention as others!
WE DON'T HAVE "RTOF16TOP" ANYMORE!
WE START COUNTING FROM ZERO!
If you say RTOF16TOP and others say RTOF15TOP....
-----------------------
Octavian F Filoti
Nuclear Physics Group
Univ. of New Hampshire
9 Library Way
Durham, NH 03824
phone: (603)862-1691
FAX: (603)862-2998
email: ofiloti@unh.edu
On Fri, 18 Oct 2002, Peter Karpius wrote:
>
> Shift started with troubleshooting ADC problems which were resolved and
> seemed to have a cable problem as a root cause.
>
> Checked ADC gate versus analog signal - there seemed to be no timing
> problems
>
> Run 2203 - good ADC cosmics run
>
> Noticed RTOF16TOP lost signal when Blast Field turned ON
> we turned this tube off for remainder of shift.
>
> Beam on just after 2115 began slit/rate studies
>
> No Gas, Slits Out
> saw approx 1:1 ratio for phys trigger:beam current
>
> Gas @ 1SCCM, Slits Out
> saw 2.5:1 ratio for phys trigger:beam current
>
> Slit opimization by CCR began until slits were just at the border of
> affecting lifetime
>
> Optimal Slit position: L =-4, R = 15, T = 5, B = -11
>
> No Gas, Slits optimized
> saw ~1:6 ratio for phys trigger:beam current
>
> Gas @ 1 SCCM, Slits optimized
> saw ~1:1 ratio for phys trigger:beam current
> (since slits were optimized per runplan we proceeded with ep studies)
>
> RUN 2205 anycoincs.settings 20K not analyzed yet
>
> RUN 2206 (still in progress)
> changed trigger to new_elastic_tof_12-15.settings and set up XMLU output
> bits so that we had separate readouts for left electron ep and right
> electron ep. Scaler rates showed a slight asymmetry in that there were
> approx ~1.5X more events for electron right However, recall we turned off
> RTOF16TOP because of the field killing the tube signal. This removed this
> TOF from the trigger (lowering the chances for an electron left ep)
>
>
> ----------------------------------------------
> Pete Karpius
> Graduate Research Assistant
> Nuclear Physics Group
> University of New Hampshire
> phone: (603)862-1220
> FAX: (603)862-2998
> email: karpiusp@einstein.unh.edu
> http://pubpages.unh.edu/~pkarpius/homepage.htm
> ----------------------------------------------
>
>
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