[d2n-analysis-talk] Fwd: LHRS Scintillator Calibration Study

[David Flay]

On Fri, Mar 5, 2010 at 11:04 AM, Brad Sawatzky <brads at jlab.org> wrote:

> Vince pointed out the answer.  Your cuts are working correctly -- the
> second band are cosmics going through the stack 'backwards'.  Note that
> for good electrons (bulk of the data) t_2m-t_s1=6ns, but for the second
> band: t_2m-t_s1=-6ns.  At high p0 we have so few electrons that cosmics
> actually compete.  Interesting.
>

Hmm, that is interesting.. So, I would need a cut on beta > 0 to make this
plot look normal again?  I'll try it out..

regarding the S1 timewalk -- I plot left TDC vs. 1/sqrt(left ADC) and I get
a straight line (using my corrected values -- to check them.) (based on
Chiranjib's approach in the transversity ELOG)

This is good. -- if I <do not> have a cut beta > 0, I see a similar double
band structure (separated by about the same time as seen in the avg. time
plot) in this plot.

These plots have beta > 0.  L = left PMT, R = right PMT; run 20675 => p =
0.60 GeV, 4-pass.  run 20207 => p = 1.70 GeV, 5-pass.

I'll check on S2m as well.



-----------------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
           flay at temple.edu

website: http://www.jlab.org/~flay
             http://quarks.temple.edu
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