Hi Flemming I like your 'first 3 deg (1/3) ' proposal , to be followed up by 4 deg (1/3 and 1/2). regards JJ ----- Original Message ----- From: "Flemming Videbaek" <videbaek@sgs1.hirg.bnl.gov> To: <brahms-l@bnl.gov> Sent: Friday, September 21, 2001 7:27 PM Subject: Run plan considerations. > First attached is a second e-mail from JJG that did not make it to > everybody.I do not think there is any big disagreements here - let me though > propose a modified plan to > > Overall Run Plan for the coming period. This likely will take 1-2 weeks > with the present > Machine performance. > > > > Consideration > a.. The FS can go to 3 deg without moving C1 > b.. 2.3 deg requires a longer access to do due to above mention note. For > the lower field runs we should at some point swing the Backend of FFS to the > larger settings, both for 2.3 deg running but also larger angles and lower > momenta. > c.. The effective number of events may be higher with the re-bunching > (~2->2.5). It is crucial to get feedback for 'analyst' reconstructed tracks > per trigger1/per trigger . > d.. We need a certain number of dedicated runs > > > There is certainly a consensus to move to more forwards angle, as well as > getting more statistics for the 4 deg 1/3 field setting. Let me propose > rather than the ½ or .6 setting at 4 deg to go to 3 deg at 1/3 field. This > gives a <y> of 2.7 and <pt>=0.5, has some PID with H2, and it seems to me > about 40-60% more statistics for protons. There is an overlap with the 4 > deg - this may actually be to our advantage to understand better how to > merge, as well as cross checks. > > > > > > > > Physics Running > Extend proton coverage for <pt> values by > a.. 3 degree 1/3 Field running ( 2.5M B, 5M A) > b.. 4 degree 1/3 Field running ( 2M B, 4M A) > c.. 4 degree 1/2 field running ( 2.5 B, 5M A) > d.. 12 degree 1/5 Field running (4M B, 8M A) > Get better quality data for higher P at y~0 > a.. Good statistics 4A,4B for 90 degree MRS. (4M) > Extend pt range for 40 deg (y~0.7) > > a.. 35/45 degree 3A/3B and 6A/6B running (4M each) > Return to data analyzed to improve statistics/clarify problems > > Run preparedness and improvements. > > a.. Study background rates vs. angles 2.5-10 deg FS (H1,H2) DC currents as > indicators. > b.. Develop the vertex trigger and implement. > c.. Develop and study H1/H2 trigger for FS. > d.. Calibration runs (0 field) to understand overall geometry , MRS and FS > (d3=0) other on. > > > > > My summary taken from the data runs since Aug16. It may be that some are not > useful due to lack of detector components (as of yesterday) > > > > Angle > Field > Trig 1 > Eff trig 1 > Hours > > 8 > 676A > 3.8 > 5.4 > 44 > > 8 > 676B > 2.4 > 3.5 > 27 > > 4 > 676A > 5.0 > 5,8 > 56 > > 4 > 676B > 4.2 > 5.9 > 58 > > 5 > 1126A > 1.7 > 2.1 > 20 > > 6 > 1126B > 1.0 > 1.0 > 18 > > 90 > 350A > 12 > 13 > 138 > > 90 > 350B > 9.5 > 11 > 119 > > 90 > 700B > 1.1 > 1.1 > 13 > > 40 > 500A > 4.3 > 5.2 > 45 > > 40 > 500B > 4.2 > 7.3 > 40 > > > > > > > > > > > > > ------------------------------------------------------ > Flemming Videbaek > Physics Department > Brookhaven National Laboratory > > tlf: 631-344-4106 > fax 631-344-1334 > e-mail: videbaek@bnl.gov > > > Dear Friends > > Following up on the previous email about run plan and FS settings: > > The FS analysts have decided to recommend that: > > 1) we move the FS back to 4 deg before this weekend > 2) we set the field to 1/2 or 60% and collect about 5 M A and 2.5 M B > and then supplement with 1/3 field. > > The physics motivation is to get a consistent set of data covering a > reasonable pt range > and a reasonably well defined rapidty interval ( at high rapidities).. > > Regards > JJ > > -- > ____________________________________________________ > JENS JORGEN GAARDHOJE > Assoc. Prof. of Physics, Dr. Scient. > > Niels Bohr Institute, > University of Copenhagen > Blegdamsvej 17, 2100 Copenhagen > Denmark. > > Tlf: (+45) 35 32 53 09 (dir) > (+45) 35 32 52 09 (secr) > Fax: (+45) 35 32 50 16 > Email: gardhoje @ nbi.dk > Home page: http://alf.nbi.dk/~gardhoje > > -Chair Ph. D. School of Physics at NBI.F.AFG. > (secr. Frank Kristensen 35 32 04 41, Ørsted Lab.) > -Member Danish National Commission for UNESCO > (secr. Ulla Holm 35 32 52 72, NBI) > ___________________________________________________ > > > >
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