一、Pedestal run monitor

1 check pedestal in one chip

2 Check pedestal in all ladders

3 check rms in all ladders

 二： Compare Intrinsic rms with New Pedestal rms(internal busy @15000 rhic clock)

P-side	N-side

RED ： rms (from pedestal run)
Black:Intrinsic rms

Comments ：

1. the rms (from pedestal run@internal busy 15000) is very close to the intrinsic noise. -- GREAT !!

三、Bad channel masking

dataset : 27 good pedestal runs
path: /star/institutions/lbl_scratch/jhthomas/SSDPedestals_2016/goodPed2016/
Work dir : /star/u/zhoulong/data02/DEV14/SST/offline_r16/BadChannelMasking/Tables_Tonko/

1、Mask bad channel method:

assumption： the rms in each channel should be very close in on chip

Calculate CMN method

2、Summary :

strips status can be found in here :
==========================
   BAD CHANNEL SUMMARY   
#Ped Runs: 27, CutRatio :0.75, Cuts = 20.25   
1.Include all ladders.    
  Bad in P-Side : 27910, Ratio = 11.3566%
  Bad in N-Side : 26562, Ratio = 10.8081%
2.Good ladder Only.    
  Bad in P-Side : 3334, Ratio = 1.50734%
  Bad in N-Side : 1986, Ratio = 0.897895%
==========================

四、Crosscheck With Jim

1 Jim's method : https://drupal.star.bnl.gov/STAR/system/files/SSD%20Pedestal%20Notes.pdf
2 My method :

Name	Jim	Long
Cuts	rms>15 rms<1 (n_bad<64)?n_bad:128	rms>15 rms<1 (n_bad<64)?n_bad:128

Reference
bad channel study and crosscheck with Jim

五、Check bad channels with Cosmic ray data

if we don't do any bad channel masking.

BLUE:after CMN suppression. with Threshold 4*sigma

RED: rms distribution in each channels

here, we could see some patterns:

The mose of hits are located at small rms channel. but not all small rms channels will creat a lot of noise.

五:check ped and rms in pedestal run

ped in all ladder	ped without bad ladder

ped vs rms

rmc<0	rmc<0.8	rms<1.0	rmc<2.0	rmc<3.0