south arm fee performance
DESCRIPTION
South Arm FEE Performance. Prior to Au run, all FEMs installed and working. Currently, 157 of 168 FEMs read out useful data. = 93.5% operational FEM losses: station 1 = 4/40 = 10% station 2 = 4/64 = 6.25% station 3 = 3/64 = 4.7% - PowerPoint PPT PresentationTRANSCRIPT
South Arm FEE Performance
Prior to Au run, all FEMs installed and working.
Currently, 157 of 168 FEMs read out useful data. = 93.5% operational
FEM losses: station 1 = 4/40 = 10% station 2 = 4/64 = 6.25% station 3 = 3/64 = 4.7%
add them up, square them to get dimuon acceptance loss due to bad FEMs ~37.5%
Several additional FEMs have dead CPA or AMU chips. Some FEMs have isolated dead channels, no gain channels.
Suspect most dead FEMs due to CLINK cables.
South Arm FEE Performance
FEM pedestals: P
edes
tal (
AD
C c
oun
ts)
channel
Pedestalstability
South Arm FEE PerformanceFEM noise (goal was < 2 ADC counts rms)
We have grounding + radiative components
Station 2~1.5 - 4.5
Station 3~1.5 - 2.8
Station 1~1.5 - 1.8
RM
S n
oise
South Arm FEE PerformanceCalibratio
n
slope = gain
gain
response
residuals (straight line fit)
South Arm FEE Performance
Residuals (station 2)
Octant test (cosmic rays) Au data
South Arm FEE Performance
ARCNet:Ability to reprogram FPGA EEPROM via ARCNet
has been tested and proven on south arm.
FPGA coding:Need to address
- five event buffering (currently have 4 event buffering) - first sample offset problem - speed of execution
South Arm HV Performance
Chambers trained well after installation in winter.
Problems appeared just before run in summer, appear to be strongly correlated with humidity.
Dry air lines run to MMS around mid-September.
Estimate ~15% additional dimuon acceptance loss due to HV. (total dimuon acceptance loss due to FEE and HV ~50%)
MuTr HV Enabling History
200
225
250
275
300
325
7/28 8/4 8/11 8/18 8/25 9/1 9/8 9/15 9/22
Date
nu
mb
er e
nab
led
304end ofrun
South Arm HV Performance
South Arm Alignment System
54 of 56 light paths functional. 1 light path blocked 1 image out of view
~10 mm precision
azimuthal
radial
field off
field on
South Arm Performance
Station 2 peak cluster charge
South Arm Performance
South Arm Performance
Number of fitted clustersper cathode plane per event