Dear Collaborator,
As a follow-up and reminder I enclose/attach what I send out to each of the BRAHMS institutions on October 10.
I have also argued at RHIC long term planning meetings that our prioritie, tentative pending discussion in the collaboration, are
a) AuAu at 100 + 100 (soft survey)
b) AuAU at 65+65 to complete this years measurement
c) AuAu high ststistics running (high pt, HBT,...)
d) possible another species at 100+100.
best regards
Flemming
Dear Collaborator / Institutional representative
As mentioned in an earlier e-mail the time has come to prepare a Beam Use proposal for the coming running year. So far I have heard from S.Sanders and M.Murray that they would like to help in this process. I invite further participation. To get the discussion started in ernest I have enclosed and attached a word file with a strawman model for an RBUP. I will like you and your group to discuss this and as a first step report back to me what your rperceives as the most important goals for the next years run.
best regards
Flemming
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Dr. Flemming Videbaek
Physics Department
Brookhaven National Laboratory
Spokesperson Brahms experiment
tlf: 631-474-4106
e-mail: videbaek@bnl.gov
enc/ same test as in attached document
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Strawman model for RBUP
Due to the pending budget some of assumptions for next years run-plan are not completely settled in US congress.
It is expected that the startup will be March 1 and the running time 24-26 weeks, including the 4 week cool- down (February 1 ?) . Thus one possible scenario will be a running period of 22 weeks i.e. 5 month ending the run around September 1.
On the luminosity the overall plan is to up the luminosity from the 10% achieved at the end of the run
to 50-100% of nominal value. In addition the RF storage cavities will be installed reducing the 'diamond' size to 22 cm.
This should be taken into account in rate estimates. Our original estimates were to run for about ½ year to complete a given collision system. Since though other experiments (and I have had some informal discussion with them) have an interest in running other energies I took a good look at such possibility, but with overall aim of getting the highest Au-Au data. The list below is a working start of what could become the Beam Use Proposal.
1.. The highest priority is to collect data at sqrt(s) of 200 GeV. It should encompass not only the soft physics at several rapidity settings, but should also aim to get to very high pt from some selected rapidities. to get this could be done in two periods. A) low-pt immediately after startup, and B) followed by a longer high-luminosity run towards the end to collect high pt- and data (particular for the Forward Spectrometer).
2.. The second priority is to complete the 130 GeV measurements adding more forward angles in particular.
3.. There is likely to be a period of pp running at Sqrt(s)==200. Are we ready to make use of this. What will the requirements be? (4-6 weeks)
4.. Will the initial energy (just above machine transition be of interest i.e. 56 GeV. This should be weighed against having running at 100.
Physics justification for run plan should be outlined. Some of these will could include
1.. Angle, field settings to get protons/anti-protons to highest rapidities.
2.. Needs i.e. statistics to compare high pt at several rapidities.
3.. HBT in FS.
To evaluate this more realistically, we need a set of proper reference model calculations, say HIJING to evaluate rates for different settings; base on the rates we can then estimate quality, and luminosity required, and attempt to convert this to weeks. This clearly depends on how far out in pt we want to go, and how many angle/rapidity settings.
As in the previous year the RBUP should also include the man-power available for data-taking, analysis etc. This requires estimates from all group how many effective man-month will be available for this tasks during the March-August period.
This archive was generated by hypermail 2b29 : Tue Oct 31 2000 - 09:05:43 EST