[Olympus] remaining program

[Brinker, Frank]

Dear all,
Beside the program you discuss here I want to ask whether another energy
calibration is wanted.
We have a calibration for e+ and e- from mid of November  and for e+
from Dec 22nd.
A try for e- in December was not successful.

I can offer to try another calibration in the night from Dec 31st to Jan
1st.

Best regards
Frank Brinker

>-----Original Message-----
>From: olympus-bounces at mit.edu [mailto:olympus-bounces at mit.edu] On
>Behalf Of Michael Kohl
>Sent: Thursday, December 20, 2012 2:14 PM
>To: olympus at mit.edu
>Subject: [Olympus] remaining program
>
>Dear all,
>
>we have collected 3.2 fb^-1 so far, almost close to the design
>luminosity.
>
>For the 12-day addendum we should make a plan for a set of additional
>measurements that could be helpful for the analysis.
>
>Here is my proposal for low-luminosity running:
>-run all four configs (e+-,B+-) without shielding but with the
intensity
>reduced to optimze the noise, each for a day.
>E.g. reduce lumi by x10, expect ~3Hz elastics = 250k elastic events per
>day -> 20 mA current / 0.2 sccm flow;
>vary the magnetic field (100%, 75%, 50%, 25%) every six hours.
>Open up the trigger by reducing the prescale on the 3-of-4 trigger type
>to max out the DAQ (<30-40% deadtime).
>
>This would cost us four days of running.
>A data set with minimized noise can help us train and optimize the
>reconstruction software, rather than using "noisy" high-luminosity
data.
>
>A dataset with minimized moise in all four configs will show how the
>cancelations in the ratio occur and will help us validate the MC.
Varying
>the magnetic field in addition will serve the same purpose. The
statistics
>will be good enough for the validation at forward angles, where also
the
>systematic effects on the single-polarity ratio were the largest.
>In the end we will need to be able to trust the MC for B+ at low
epsilon.
>
>At low luminosity, a trigger which is more more open also allows to
verify
>TOF and trigger efficiencies, and to break any inefficiencies further
down
>as a function of channels, coordinates etc.
>
>We should start producing that set of measurements beginning on
Saturday,
>so that it could be finished by Wednesday. If it takes longer we still
>have a few days left. Any final remaining days would be used to further
>improve the statistics.
>Frank Brinker also would like to do another Touchek energy measurement,
>probably on Dec 31 / Jan 1.
>
>If you have further ideas or wishes, please bring them up.
>
>Best regards
>   Michael
>
>
>
>+---------------------------------------------------------------------
>| Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
>| Physics Department, Hampton University, Hampton, VA 23668
>| Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
>| Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
>| Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
>| Email: kohlm at jlab.org
>| Cell:  +1-757-256-5122 (USA)
>|
>| Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
>| Phone: +49-40-8998-6406, Cell: +49-171-101-1967
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