Difference between revisions of "L-HRS for SBS"
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Revision as of 16:54, 7 June 2021
The Left HRS will be used during the SBS era for calibrating HCAL and possibly for a hypernuclear experiment. Here's a talk about it: http://userweb.jlab.org/~rom/LHRS_BobM_17May21.pdf
Contents
Running the Left-HRS DAQ
Commissioning Plan for Left HRS
Detectors on Left HRS
Analysis Software for Left HRS
Commissioning Plan for Left HRS
Before we use the Left HRS to commission HCAL, we need to spend some time checking the HRS itself. Most checks of detector and the DAQ can be done with cosmics or with pulsers, but the two topics where we need beam are: 1) Check the HV on the Cherenkov detectors (particles need to go in the right direction, and 2) Check the magnetic optics (we can start with an optics database from the Tritium era.
Initially we'll have the HRS at about 90 degrees. We can run with beam and check detectors and look at reconstructed angles at the target. We can do this parasitically or late at night when nobody is in the hall. (We need the beam on target.). For the reconstructed angles, all is well if the acceptance looks about right (a familiar rectangle) and we can compare to Monte Carlo. Later, when we remove Bigbite, we can put in the sieve slits and check more carefully the optics. If the optics are really bad (blurry hole pattern) we can do an optics calibration run plan. However, I doubt that this is necessary.
Rate calculations for e-P elastic scattering. Assuming 15 cm LH2 target. 1 uA of beam. Here I used some of the kinematics given in the HCAL run plan. 4.4 GeV is not very practical. Note, the sieve slit will cut the rate by a factor of 200. E' is the momentum setting of the L-HRS for elastic. E theta_HRS E' Rate (GeV) (degrees) (GeV) (Hz for 1 uA beam) 4.4 30.9 2.64 2.9 Hz/uA 4.4 34.1 2.44 1.3 Hz/uA 4.4 61.1 1.29 0.018 Hz/uA 4.4 64.3 1.20 0.014 Hz/uA 4.4 67.5 1.13 0.010 Hz/uA 4.4 70.7 1.06 0.008 Hz/uA 2.2 30.9 1.65 216 Hz/uA ..... angle available when Bigbite removed (can run with sieve) 2.2 34.1 1.57 100 Hz/uA 2.2 40 1.42 29 Hz/uA 2.2 45 1.30 11.7 Hz/uA 2.2 80 0.75 0.27 Hz/uA .... run here at 40 uA (without sieve) 2.2 90 0.66 0.15 Hz/uA
