[Olympus] PRC70 - report

[Brinker, Frank]

Dear Richard, dear colleagues,
It's good to hear that the PRC is supporting us and the points you
mentioned are reasonable and need our attention.
I can say, that it's planned for the 4th of november in the next service
week to try to test electron operation of the LINAC, the accumulator
ring and maybe the DESY synchrotron. Accelerating electrons with the
LINAC should be easy, but it'll take some time to establish procedures
for switching back and forth  effectively and reproducible.
The first runs with electrons in DORIS will be possible in February next
year. It would be great, if the test experiment would be ready to take
data - even if it's not fully equiped at that time.

I have also some questions to you concerning the needed repeatablity of
the beam parameters - during the runs, from run to run and especially
from e- to e+. 
To calculate the error bars of the final e+/e- ratio "R" we need to know
the dependencies of R on the beam parameters - or other way round to
determine the needed precision to reach our goal.

Therefore the question is: What is the dependence of R on
- beam energy
- beam position
- beam angle
- horizontal and vertical emittance
- bunch length
- background ( scattered particles from dust )
- differences of ion/electron densities within the target due to
different electric field of the beam

We'll try to determine the accuracy of the parameters for the next
Olympus meeting. If someone could give numbers for the dependencies we
would see where we are standing and whether we need to improve things.

With best regards
Frank Brinker



>-----Original Message-----
>From: olympus-bounces at MIT.EDU [mailto:olympus-bounces at MIT.EDU] 
>On Behalf Of Richard G Milner
>Sent: Friday, October 15, 2010 7:07 AM
>To: olympus at MIT.EDU
>Subject: [Olympus] PRC70 - report
>
>
>Dear OLYMPUS colleagues,
>This is a short note to report on the presentation and 
>discussion in open and closed session to the DESY PRC which 
>took place here at Zeuthen yesterday.  It went well.  The PRC 
>was `very impressed with the considerable progress on the 
>OLYMPUS experiment and congratulated the collaboration.?  In 
>closed session, discussion focused on the following points:
>
>-	Keeping the OLYMPUS target installation to the tight schedule
>-	Choosing soon the optimal 12 deg. lumi monitor GEM configuration
>-	Making it a priority for DESY to provide electron beam 
>in DORIS to the OLYMPUS
>test experiment
>-	Development of the analysis software in a timely way
>-	Preparing a detailed plan (inc. milestones and 
>manpower) for the test
>experiment
>
>The discussion was reasonable and supportive.  I thank all who 
>have worked hard to put our experiment in such a favorable 
>position. Of course, there is an intensive period ahead but 
>DESY will support us in every way it can to guarantee success. 
> Finally, thank you to all who sent me slides.  My 
>presentation in open session is attached.
>
>With best regards,
>Richard
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