[Hps] Data taking plans in the next three days

[Stepan JLAB]

Ken,

As can be seen from measured beam profiles we already have 10^-4 or more. Since we anticipate different machine in spring, I do not think there is need for more detail studies of tails.

Stepan

Sent from my iPhone

> On Dec 18, 2014, at 5:45 PM, Moffeit, Kenneth C. <moffeit at slac.stanford.edu> wrote:
> 
> 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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