[Olympus] remaining program

[Michael Kohl]

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



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| 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)
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| 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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