[Hps] Data taking plans in the next three days

[Moffeit, Kenneth C.]

Hi,
What dynamic range for the harp scan can we expect with a simple scan the way thing are now: tails at the level of 10**-4 or can we do better? Even knowing the tails are less than 10**-4 of the beam core would be useful information.

Ken

On Dec 18, 2014, at 11:02 AM, Stepan JLAB <stepanya at jlab.org> wrote:

> Takasi, 
> 
> Procedures are not clearly defined for large dynamic range harp scan. It is not useful to do it now.
> 
> Stepan
> 
> Sent from my iPhone
> 
>> On Dec 18, 2014, at 8:se22 AM, Maruyama, Takashi <tvm at slac.stanford.edu> wrote:
>> 
>> In addition to these data taking, the following works are planned,
>> 
>> 5) Arne/Mike to work on rotating the beam  spot by 45 degrees. This work may not be invasive, but we have to do harp scan when requested.
>> 
>> 6) 60 Hz data
>>    Hovanes and Rafayel have taken data, but the CPU was too slow. They are going to replace the CPU and try this again.
>> 
>> 7) SVT Collimator and beam stability study.
>>    We can try large dynamic range harp scan if it works.
>> 
>> 8) Measure neutron flux using bubble detectors
>>    When the beam is stable, we take a short control access to install the detector, run the beam for 1 hour and then take another control access to count bubbles.
>> 
>> Takashi 
>> ________________________________________
>> From: hps-bounces at jlab.org <hps-bounces at jlab.org> on behalf of Maruyama, Takashi <tvm at slac.stanford.edu>
>> Sent: Wednesday, December 17, 2014 5:39 PM
>> To: hps at jlab.org
>> Subject: [Hps]   Data taking plans in the next three days
>> 
>> Assuming we have a good stable beam, the following data will be taken in the next three days,
>> 
>> 1) Loose two cluster trigger with pair trigger tag.
>>     This is our auto-pilot DAQ mode and data will be taken during late swing and owl shift when expert does not have to be present.
>> 
>> 2) Raw fADC data to study pile-up
>>       Data will be taken during day shift.
>> 
>> 3) Single cluster trigger with high energy threshold
>>     This is for beam energy calibration. Since pre-scaling is not quite ready, masking is used to increase statistics in the outer region.
>> 
>> 4) Beam-gas scattering sample
>>      No target. Chicane magnet setting will be varied from -25% to -20%, -15%, -10%, etc.
>> 
>> If you have any other proposal, please speak up.
>> 
>> Takashi
>> RC
>> 
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