From: Flemming Videbaek (videbaek@sgs1.hirg.bnl.gov)
Date: Fri May 23 2003 - 11:28:14 EDT
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/
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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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