Difference between revisions of "The Proton Recoil Detector"
From Hall A Wiki
m (→Timing Resolution Requirements (by Zhihong Ye, 04/14/2016)) |
m (→Results) |
||
| Line 21: | Line 21: | ||
===Results=== | ===Results=== | ||
| − | * Here are the time difference of pions, kaons and protons w.r.t electrons at three different detectors | + | * Here are the time difference of pions, kaons and protons w.r.t electrons at three different detectors, w/o the smearing of time-resolution. |
[[Image: time_diff.png|600px]] | [[Image: time_diff.png|600px]] | ||
Latest revision as of 17:59, 14 April 2016
Contents
Timing Resolution Requirements (by Zhihong Ye, 04/14/2016)
Introduction
I am quickly looking at how well the timing resolution should be if we want to use the TOF as PID to identify protons from other particles. We have three timing detector, the LASPD and FASPD at the large-angle and forward-angle detector regions in SoLID, and also the new proton recoil detector (PRD).
- Here are the detector locations:
L_Target = -350.0 #cm, +/- 20cm long target cell L_FA = 410.0 - L_Target #cm, MRPC's location L_LA = -67.15 - L_Target #cm, LASPD's location
- Proton recoil detector, 80cn from target center, 200cm long, tilted at -45 degree, angles from 24degrees to 65 degrees
L_PRD = 80.0 #cm,
I made a scratch of the possible PRD may being like:
- I randomly generated events with momentum from 0.1GeV/c up to 10.2 GeV/c, and fix the angle of particles reach the detectors at 8.0degrees for FASPD, 16.0degrees for LASPD and 45degrees for PRD.
- I looked at the time resolution to be 0ps, 10ps, 50ps, 100ps, 150ps and 200ps.
Results
- Here are the time difference of pions, kaons and protons w.r.t electrons at three different detectors, w/o the smearing of time-resolution.
- At FASPD:, the plots of (Beta_pi - Beta_e) vs. P, for pions (and also for kaons and protons), and the second plot here is for the 1D beta distribution.
- At LASPD:, the plots of (Beta_pi - Beta_e) vs. P, for pions (and also for kaons and protons), and the second plot here is for the 1D beta distribution.
- At PRD:, the plots of (Beta_pi - Beta_e) vs. P, for pions (and also for kaons and protons), and the second plot here is for the 1D beta distribution.
Conclusions
- Here is my conclusion of the timing requirements to identify particles with momentum below 1.2GeV, based on these study:
1, for FASPD, proton can be easily separated from others with reasonable resolution <=150ps
2, for LASPD, proton may started to be contaminated by kaons around ~100ps, but kaons rare and pions are still far.
3, for PRD, due to the distance between PRD and the target is only ~ 80cm, protons will be mixed with kaons and pions but should be easily separated from electrons.
