Current status 2014.04.03 Minjung Kim

contents SMD gain fit Beam position scan Local polarimetry

SMD ADC distribution: 2 exponential fit [0]*exp{ -(ADC-ped)*[1] } + [2]*exp{ -(ADC-ped)*[3] }

Fit parameters [0]*exp{ -(ADC-ped)*[1] } + [2]*exp{ -(ADC-ped)*[3] } If [1] propotianal to [3], gain can be set propotianal to [1] ([3]). -> [1], [3] correlate

[1], [3] correlation: correlate p1=[1], p3=[3] set gain for each channel: Relative gain of each channel= ( [3] + [1]*3.111 )/0.2 Gain= ( [3] + [1]*3.111 )/0.2 /average or Relative gain -> make gain average=1

Comparison with DB

XY distribution: left-DB gain, right-New gain run386408 south

run386408 north

run south

run north

Phi asymmetry for center

Asymmetry vs energy

Beam position scan Assume center for 81 positions (-2.0~2.0, 0.5 cm interval. x,y 9x9 ), then calculate raw asymmetry Position with largest asymmetry will be center Plots for all fills : https://www.phenix.bnl.gov/WWW/p/draft/minjung/LPOL/bpos plot/

Beam position scan for transverse fill

Beam position scan for longitudinal fill Several fill’s example. Should check asymmetry for several position because it is hard to see center/moves

Longitudinal component for run13 Ignore fitting.

plan Organize results. Check code’s bug. Finish analysis note (~ middle of May )

Back up

Red points: I fit with [0] Red points: I fit with [0]*cos(x-[1]), so [0] can be (-) depend on what value it get [1]. If see only absolute value, this result makes sense.