Difference between revisions of "Spring 2019 Primex"
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(Created page with "=Draft Run Plan for the PrimEx-D Run for first few weeks= (Updated: 01/10/2019) ==Overview== The goal of the experiment: extract the η rad. decay width with as high accura...") |
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#With empty target: | #With empty target: | ||
− | # | + | ## Remove the LH2target cell <strike>(if ST needs to come out then remove it also)</strike>. day shift, 7am - ~4pm |
− | # | + | ## Checkout and calibration of CCAL 2 shifts ~4pm – 7am |
− | + | ||
#With Be target: | #With Be target: | ||
− | # | + | ## Install Be target, ST <strike>possibly</strike> in w/o cabling and survey. Day shift, 7am – ~4 pm |
− | # | + | ## If Be-target is ready, run Compton ~5 shifts ~4pm – 7am |
− | + | ||
#With <sup>4</sup>He target: | #With <sup>4</sup>He target: | ||
− | # | + | ## Work on target, remove Be <strike>(if needed remove ST)</strike> day shift, 7am – ~4 pm |
− | # | + | ## If <sup>4</sup>He target is not ready, run “Be empty” target <strike>(ST is back)</strike> 2 shifts, ~4pm – 7 am |
− | # | + | ## Work on target install <sup>4</sup>He, ST cabling day shift, 7am - ~4pm |
− | # | + | ## Setup checkout with beam 2 shifts, ~4pm – 7am |
− | # | + | ## Continue work on <sup>4</sup>He, survey day shift, 7am - ~4pm |
− | # | + | ## If LHe4 still empty, run “<sup>4</sup>He empty” 2 shifts, ~4pm – 7am |
− | # | + | ## If “empty” is finished, fill <sup>4</sup>He target and run LHe4 Compton |
− | # | + | ## Prepare the setup and run for η-Primakokf ~4pm – April |
− | # | + | ## Keep analyzing data |
Revision as of 08:45, 18 January 2019
Draft Run Plan for the PrimEx-D Run for first few weeks
(Updated: 01/10/2019)
Overview
The goal of the experiment: extract the η rad. decay width with as high accuracy as possible.
How: from the measured absolute diff. cross sections.
The method:
- measure the Compton diff. cross section on 5% Be target;
- compare with the known theoretical cross section and extract the so-called “setup normalization constant-Be” (ideally it should be “1”, this number will be sensitive to photon flux and efficiencies of CCAL and FCAL);
- measure the same Compton diff. cross section on 4He target;
- compare with theory prediction obtained with estimated 4He target density and with the “setup normalization constant-Be”. This new number will be used to normalize our dN(η)/dθ to get the cross sections in μb/Sr.
Run Plan
- With empty target:
- Remove the LH2target cell
(if ST needs to come out then remove it also). day shift, 7am - ~4pm - Checkout and calibration of CCAL 2 shifts ~4pm – 7am
- Remove the LH2target cell
- With Be target:
- Install Be target, ST
possiblyin w/o cabling and survey. Day shift, 7am – ~4 pm - If Be-target is ready, run Compton ~5 shifts ~4pm – 7am
- Install Be target, ST
- With 4He target:
- Work on target, remove Be
(if needed remove ST)day shift, 7am – ~4 pm - If 4He target is not ready, run “Be empty” target
(ST is back)2 shifts, ~4pm – 7 am - Work on target install 4He, ST cabling day shift, 7am - ~4pm
- Setup checkout with beam 2 shifts, ~4pm – 7am
- Continue work on 4He, survey day shift, 7am - ~4pm
- If LHe4 still empty, run “4He empty” 2 shifts, ~4pm – 7am
- If “empty” is finished, fill 4He target and run LHe4 Compton
- Prepare the setup and run for η-Primakokf ~4pm – April
- Keep analyzing data
- Work on target, remove Be