Hello. I am not against taking data at all. Just don't ask me to make dn/deta for 0-5% for 22 Gev runs in 3 weeks from now. (I still need to graduate before my visa expires.) Also, if only global detectors are on, I see no reasons for shifters to be there. (Maybe, this violates the BNL safety rules???) Hiro On Sun, 18 Nov 2001, Fouad Rami wrote: > > > Hi, > > Hiro, don't be pesimistic! > > There is at least one issue where we can reasonably hope to get some > physics out of the 22GeV run; That's the limiting fragmentation (one > of our specific physics corners). This does'nt require a fully efficient > trigger. We know that LF is centrality independent and we can even check > it at 22GeV (use just relative cuts in centrality). > It would be really very nice to get the complete picture from > 22GeV -> 200GeV under the same conditions (collider configuration, > same detector, same people, etc..) and for the same reaction. > This will be also important for LHC (as Jens Joergen has mentioned > in one of his recent mails). > One could even hope to publish a dedicated short paper on limiting > fragmentation with the whole data (including hopefully also p+p data > at 200GeV ?). > The only problem that I see is statistics, whether it should be > sufficient (24hours)? not clear to me. > Anyway let's be optimistic and take data... > > Regards, Fouad > > > On Sat, 17 Nov 2001, Hironori Ito wrote: > > > 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 : Sun Nov 18 2001 - 13:22:17 EST