From: Dana Beavis (Beavis@sgs1.hirg.bnl.gov)
Date: Fri May 23 2003 - 15:13:55 EDT
Ed has turned the flammable gas off. I will have him turn the isobutane and alcohol system back. Someone will need to contact Ed on Tuesday to turn it off we we are not aloed to run. dana ----- Original Message ----- From: "Brendan Fox" <fox@drax.Colorado.EDU> To: <brahms-l@bnl.gov> Sent: Friday, May 23, 2003 2:00 PM Subject: Re: end of brahms+phobos pp run > > Hi Dana and Ed, > > Can we keep the isobutane flowing until Monday? I would like to see the > machine prove that there is a significant improvement in luminosity before we > shut down BRAHMS. Let me know ... thanks ... > > ... brendan > > From: Flemming Videbaek <fvidebaek@optonline.net> > Subject: Re: end of brahms+phobos pp run > Reply-to: Flemming Videbaek <videbaek@bnl.gov> > > Hi Brendan, > > you can talk to Dana/Ed baker about the flowing of the isobutane. That is is > only real thing that would take time to bring back up anything else is fast - > I do not like the way it was handled too, but thinks this is one (I think > Gerry also found it was the preoper way to proceed) . I am at home with > people working on the house (kitchen floor) > > Flemming > ------------------------------------------------------ > Flemming Videbaek > Physics Department > Brookhaven National Laboratory > > tlf: 631-344-4106 > fax 631-344-1334 > e-mail: videbaek@bnl.gov > > ----- Original Message ----- > From: "Brendan Fox" <fox@drax..Colorado.EDU> > To: <brahms-l@bnl.gov> > Sent: Friday, May 23, 2003 12:55 PM > Subject: Re: end of brahms+phobos pp run > > > | > | 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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