[Halld] Proposed intensity scan for Fall 2018

[Justin Stevens]

Dear Collaborators,

Following the discussion at this morning’s RC meeting for an intensity scan this Fall, here is what I would propose: https://docs.google.com/spreadsheets/d/1UT3o4yJ-avlIQzmZKJo2nRrgVPzYKJvGPJ0oqAn81Oo/edit?usp=sharing <https://docs.google.com/spreadsheets/d/1UT3o4yJ-avlIQzmZKJo2nRrgVPzYKJvGPJ0oqAn81Oo/edit?usp=sharing>.  There are two sheets at this link: RunPeriod-2018-08 (the proposal for this week) and RunPeriod-2018-01 (the data we've collected previously).  As a reminder, in Spring 2018 we did not have any high-statistics intensity scan with the final Tungsten foil installed in the beamline.

The proposal covers the same range of intensity (Beam current x RL) as we had in Spring 2018, with 100M events at each setting (aside from the very low intensity, where the rate is too low).  As Sergey requested, this also includes a raw mode run at each setting of 1M events, assumed to run at ~3 kHz.  The goal is to have a complete set of intensity scan data for efficiency studies with this Fall 2018 data.

The estimated beam time required for this proposal is ~28 hours at 100% efficiency, so it would likely take at least 2 days of calendar time to complete. 

Comments/suggestions welcome,
Justin
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