[Olympus] Season greetings - Re: remaining program

[Roberto Perrino]

Dear All,

I have enjoyed very much participating into shifts for this beautiful experiment,
and learned a lot by talking to the colleagues I met, who kindly helped me to get a flavour of their profound
knowledge of the apparatus and its physics.
Since I could not do it before leaving Hamburg, let me send you now
my best wishes for a Merry Christmas and a Happy New Year
and a successful completion of the data taking.

With my best regards,

Roberto

---

On Dec 20, 2012, at 2:14 PM, Michael Kohl wrote:

> 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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