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