For 22 Gev run, I am not sure it is possible to get multiplicity results because ZDC is only about 10 % efficient with this energy. This means we (or I ) are not sure what fraction of the total cross section is measured for those energy. (I do not know what PHOBOS is thinking. Also, I need more statistics than what PHOBOS needs because our detector cover smaller solid angle than they do.) Any ideas are welcome, but otherwise I think it is a waist of shifters' time. hiro On Sat, 17 Nov 2001, [iso-8859-1] Jens Jørgen Gaardhøje wrote: > Hello friends > As concerns the run. > -Ian and I discussed the 12 deg statistics yesterday based on a fisrt analyis of a run at the present setting. > It is still to early to really evaluate the present run, but it seems likely that we will not have time to do 2 polarities at this > angle and high field setting. We will need to make a final decision by monady or tuesday. > -I would think that we should run at 22 GeV. If nothing else we should be able to get the multiplicity distributions. > regards > JJ > > ________________________________ > Jens Jørgen Gaardhøje > Assoc. prof. Dr. Scient. > Chair Ph.D: school of Physics NBI.f.AFG. > (secretariat. 35 32 04 41) > Chair science committee. UNESCO Natl. Commission. > (secretariat. 33 92 52 16) > Office: Niels Bohr Institute, Blegdamsvej 17, > 2100, Copenhagen, Denmark. > Tlf: (+45) 35 32 53 09 > Fax: (+45) 35 32 50 16 > ________________________________ > ----- Original Message ----- > From: Flemming Videbaek > To: brahms-l@bnl.gov > Sent: Saturday, November 17, 2001 5:10 PM > Subject: run status > > > > The AuAu running is going into the last 8 days of running. The machine has run fairly well in recent eve+nights and this is expected > to continue over the weekend. The yellow beam still has lifetime problems, and and 12 hour beam development period is scheduled from > Monday morning 6.00 am. > > - Please turn magnets to 0 field, and standby at that time. > > - The running at 12 deg 2/3 fields has started (.66 M) collected > aim up to 810M at 2/3 field (and at least 4M) > - 40 deg 1.5 M for HBT is complete. > - The high statistics program at 90 deg has started - there is an issue if the retracted position (i.e. reduced solid angle by 25%) is > an issue. > > In the previous e-mail I requested, and will like to repeat a call for un-finished business. e.g angles, fields in the exsisting program > that needs repeating, or special runs that enhanches our understanding of present data or in preparation for upcoming runs. > > So far there are a couple of items > > - Michael M. requested a short run ~100K minbias data with reduced ZDC HV to understand tube saturation. > - I will like to take a several hours to develop the H1/H2 trigger setup, probably middle of the week (though not Thursday) > - Michael suggested we study the 22GeV beam, not so much to take physics data, but to gain insight how to deal > with lower energy beams in preparation for the future. E.g. ZDC threshold/settings/response triggering. He is planning to come to BNL > for the weekend for this purpose. > > > >
This archive was generated by hypermail 2b30 : Sat Nov 17 2001 - 15:31:56 EST