Dear Flemming,
would it be possible to take a
short run with ZDC voltage dropped by 100V on
all channels. This would just be to confirm that
we have no saturation problems.
Yours Michael
Quoting Flemming Videbaek <videbaek@sgs1.hirg.bnl.gov>:
> The AuAu running is going into the last 10 days of running. With the
> very succesfull running in the last 24 hours (~940k trigger six in two
> shifts) the survey program is essential complete and we have stated
> taken data at 12 deg.
>
> Based on discussion within the collaboration the recomendation (from
> today's meeting here at BNL), and I trust in agreement with the
> majority
> of posted collaboration ideas.
> (all units in terms of trigger 6)
>
> a) Continue high statistics running at 12 deg until end of run
> - 1M A,B with 1/2 field (.9M A done)
> - short 0-field run
> - 4-8M at 2/3 field
>
> b) complete some MRS 90 deg low field
> - collect ~1.5M at 40 deg for possible HBT (and understanding of
> this)
> - collect at 90 deg with 6B for remainder of run ~3-7 M. (with give
> upto 20-30 protons per 200 MeV/c at 3-4 GeV/c)
>
> The plan as well as accomplishments since ~10/15 can be found on the web
> summary
> http://pii3.brahms.bnl.gov/~operator/shifts/RunStatistics2001.htm
>
> A few works on feasibility and expectations.
>
> - based on a rapid analysis of run 5812 (only) with ffs tracking (good
> status, good swin, tight Ty) we get about 1 count/100K trigger 6 per
> 200MeV/c ptbin at 3 GeV/c (at 15 GeV/c just above the P.ref.) an
> extrapolation to 4 GeV/c being outside the favourable acceptance might
> give 0.02-.03 in the same pt-width.
>
> Thus the expected rate may be in order 10 per 1M at 3 Gev/c and .3 at 4
> GeV/c with a maximum of 100, and 3 in the remainder of the run.
> This the needs effeciency factors for Back FFS (a good fraction of the
> tracks in the optimum p range will go through the full spec though
> not all . To optimize acceptance for pt~ 2-4 give the recommended value
> of 2/3 in field setting. As you can see to get any reasonable
> statistics
> one has to stick with essentially one setting.
>
>
> This is also a last call for 'missing' settings i.e. short <=200K of
> previously taken one,
> that for one or another reason has problems.
>
> regards
> Flemming
>
>
>
> ------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
>
> tlf: 631-344-4106
> fax 631-344-1334
> e-mail: videbaek@bnl.gov
> ------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
>
> tlf: 631-344-4106
> fax 631-344-1334
> e-mail: videbaek@bnl.gov
>
Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
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