[Tpe] Q2 vs epsilon Preliminary Statistics

[Larry Weinstein]

Dear Folks,

There is a known problem with the back angle TOFs that was discovered by 
Frost.  Last night we lowered the back angle TOF thresholds to 75 mV 
(the Frost value).  We will leave them at that value for the rest of the 
run.  This means that the December runs will be less valuable.

I will talk to Eugene about the TOF efficiency with these thresholds to 
see if there are any measurements.  Dan Carman showed me the 100 mV 
efficiency data and it is very bad for some paddles (less than 50%).

Fortunately, everything will cancel in the triple ratio!

- Larry

Will Brooks wrote:
> Dear Robert,
>
>    Is there any progress in looking at the back angle TOF's? If there is
> a big trigger bias in the case that the threshold is too high, we may
> not be able to use the data taken with that condition because we may not
> be able to model the trigger adequately.
>
> Thanks,
>
>    - Will
>
>
> On 1/5/11 3:00 PM, Robert Paul Bennett wrote:
>    
>> I have attached a spreadsheet of preliminary statistics for Q2 vs Epsilon
>> for two runs that were cooked.  These will be compared with Dasuni's
>> simulations (after the 1:30 MCC meeting):
>>
>> http://clasweb.jlab.org/cgi-bin/ENOTE/enote.pl?nb=tpe&action=view&page=373
>>
>> These were both positive polarity runs.  The farm is acting up at the
>> moment.  I will produce similar numbers for a negative polarity run when
>> it comes back up.  Comments, questions and corrections are welcome, as
>> always.
>>
>> Regards,
>> Robert
>>      
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-- 
				Sincerely,
				Larry

-----------------------------------------------------------
Lawrence Weinstein
University Professor
Physics Department
Old Dominion University
Norfolk, VA 23529
757 683 5803
757 683 3038 (fax)
weinstein at odu.edu
http://www.lions.odu.edu/~lweinste/