From: Brendan Fox (fox@drax.Colorado.EDU)
Date: Fri May 23 2003 - 12:55:20 EDT
Hi Flemming, Can we wait a day or so before we put the experiment in stand-by mode? I think that this decision sucks (especially the manner in which it was made) and would like to see if, over the next day or so, the machine can deliver the luminosity before we consider this decision to be final. What do you think? - brendan On Fri, 23 May 2003, Flemming Videbaek wrote: > Dear collaborator, > > unfortunately I have to bring you one more change in schedule, this not being a good one for Brahms and Phobos. Last night we were summoned to a meeting this morning at 9.30 (see encl. e-mail); I managed to get a message to the institutional reps on the issue. > > At the meeting T.Roser summarized the evidence for possible higher lum with ferwer collisions points, for most stores there is a 20-50% difference for bunches colliding ferwer times, albeit > not for all. T.Kirk commented that the aim as well as justification for the last extension was the possibility to do a delta-G measurement in Star and Phenix and he as Associated Lab director for RHIC has the goal the maximize the good outcome for this physics.In addition the expected fiscal funding for next year as well as needed upgrades to AGS for polarization will make it most likely there will only beam one beam species (au) next year with no pp running > > Based on the input from the machine people (and probably also from Star+Phenix) would like to go to a two collisions interection only mode as soon as possible. > > First I and then Wit Busza preseneted arguments for the the phyics that would not be done, and I as well > for the utterly chaotic way planning had been done. > Since of course his mind was made up ahead of time I am quite sure the final decision was to collide at STAR and Phenix only following the next store. > I requested that T.kirk send a letter/ e-mail to all collaboration on the decision and what physics would not be completed > > This thus is the end of the run-3 at RHIC; shifts are cancelled from ~noon time, and the experiment will be secured (stop isobutane, turn down HV etc). > > regards > Flemming. > > ------------------------------------------------------ > Flemming Videbaek > Physics Department > Brookhaven National Laboratory > > tlf: 631-344-4106 > fax 631-344-1334 > e-mail: videbaek@bnl.gov > > > enc 1/ > > -------------- > > Flemming and Wit, > > As you know there seems to be strong evidence that reducing the number of > collision points in RHIC will lead to a substantial increase in the > luminosity for the remaining experiments. Tom Kirk has asked me to organize > a meeting for 9:30 tomorrow morning in Derek's office to discuss the impact > of an early termination for BRAHMS and/or PHOBOS. > > The termination could come as early as tomorrow. > > sorry for the short notice. Please send a representative if you cannot be > there or be available for a discussion at 9:30 by telephone. > > best regards, > Phil- >
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