South Arm FEE Performance

1. 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.

2. Pedestal (ADC counts) channel South Arm FEE Performance FEM pedestals: Pedestal stability

3. Station 1 ~1.5 - 1.8 RMS noise Station 3 ~1.5 - 2.8 South Arm FEE Performance FEM noise(goal was < 2 ADC counts rms) We have grounding + radiative components Station 2 ~1.5 - 4.5

4. South Arm FEE Performance Calibration response slope = gain residuals (straight line fit) gain

5. South Arm FEE Performance Residuals (station 2) Octant test (cosmic rays) Au data

6. 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

7. 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%)

8. 304 end of run South Arm HV Performance

9. South Arm Alignment System azimuthal 54 of 56 light paths functional. 1 light path blocked 1 image out of view ~10 mm precision field on field off radial

10. South Arm Performance Station 2 peak cluster charge

11. South Arm Performance

12. South Arm Performance Number of fitted clusters per cathode plane per event