20200415-PREX2-Analysis

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Agenda

1. Siyu: Update on CRex HRS Optics[1]
   • SJ: how should I relate the pecentage error to HRS resolution
   • KK: is Delta P defined as momentum differences? SY: Yes
   • KP: the 0.64 percent means 0.64% times 10 MeV
   • KK: you can subtract it from background and estimate the statistical error.
   • BQ: Bin size may matter as well
   • KK: A full error propagation will be helpful
2. Tao : update on pattern polarity [haplog 4074]
   • Separation and order between blue and red dots are very consistent.
     • KK: it could be pickup different between the first 4 and second 4 octets.
     • PK: It can be a 30 Hz noise as well and phase is stable to helicity window.
     • KK: we need to quantify the amplitude of pikcup
     • KP: the plot needs a proper scale and clean up junk points.
   • KP: some BCM noise is instrument dependent and partially from pedestal pickup
   • KP: polarity dependent charge asymmety may be real and is captured by BCM and corrected to detectors
   • KP: And BPM readout may be false and introduce polarity pickup to regressed detectors. This is just a model to explain.
   • TY: The error bar in the beam correction plots is defined beam jitter RMS
   • in unrotated position, only 4eX shows pickup. In the rotated frame, only 4eY shows pickup
     • KP: it is unclear why pickup does not show in both X and Y in rotated frame.
   • TY: the complement BPM 4eY/X doesn't show clear pickup
     • KP: we might need to predict one BPM position from the others and compare them.

Analysis projects

1. BCM double difference study
2. BPM resolution
3. Pedestal / Normalization BCM history
4. Events/ Patterns Counter
5. Dithering sensitivity/Quality re-check
6. Grand statistics re-check
7. Linearity check

Present

Kent P, Adam Z, Brian Q, Cameron C, Caryn P, Chandan G, Devi A, Dmitrii N, Dustin M, Ezekiel W, Guido U, Hanjie L, Jim N, Paul S, Robert R, Ryan R, Silviu C, Siyu J, Tao Y, Victoria O, Weibin Z, Ye T, Yufan C, Krishna K, Iris H, Sanghwa P, Ciprian G, Paul K