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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