Difference between revisions of "Commissioning Run Plan"

Revision as of 16:42, 6 October 2014

For the Fall of 2014 assume:

• max 20 uA but for short times it can go higher for boiling studies and BCM calibration.
• 7.3 GeV @ 4 pass, 5.5GeV @ 3 Pass and 3.7 GeV @ 2 pass. No five pass beam in the Fall of 2014.

Pre-beam Checklist

Trigger Checkout (Experts)

* Checkout trigger timing
* Checkout of EDTM (Barak Schmookler)
* Think about adding 60, 100, 150, and 200 ns wide electronic deadtime scalers.
  This has been found to be a robust method for determining electronic deadtime in Hall C and we should think about adding something similar for GMP.

HRS Detector Checkout (Detector Experts)

* Take a long cosmics run with all detectors on.
* Look for dead and hot wires in the wire chambers against an earlier plot to look for any possible inconsistencies in wiring.  Check these against 
  those listed in the current analysis parameters. (Yang Wang)
* Look at ADC distributions for the hodoscopes Gas Cherenkovs and lead glass calorimeters.  Are they all firing? (Barak Schmookler, Longwu Ou)
* Look at TDC distributions for hodoscopes and Gas Cherenkovs.  Is the timing reasonable, any multiple peaks, within timing range, etc? 
  (Barak Schmookler, Longwu Ou)

Commissioning and Calibrations

Beamline

Spectrometer Optics

• Time estimate: 1-2 hours

* A Hall A Tech may be required to install the sieve-slit collimator onto the front face of the HRS.
* Take a sieve slit run with the multi-foil carbon target at least 100k events for the inelastic kinematics in the table.
* If the spectrometer momentum setting is increasing, make sure you cycle Q2 and Q3 as per the cycling procedure.
* Repeat the above with vertical shift by half a row.

 \begin{center}
   \begin{tabular}{|c |c |c |c |c |c|c|}
     \hline
     \multicolumn{3}{|c|}{HRS} & target & fast raster & $I_0$ \\
     collimator & $\theta_e$ & $P_0$ &   & X x Y (half width)&       \\
     \hline
     sieve & 30.0$^{\rm o}$ & 2.0 GeV/c & C/quintar & 1 mm x 1 mm & 20 uA \\
     \hline
   \end{tabular}
 \end{center}

Elastic electron-proton measurement. Assuming a 15 cm LH2 target, a spectrometer acceptance of 6 msr and dipole form factor to compute the central cross-section. (Table from DVCS3 wiki page)