1. FMS Readiness for Run 11
Stephen Trentalange

2. General Plan May: Hardware Investigation
June: Operation with Cosmic Rays/LEDs
Exercise entire system thru DAQ
July-August: Analysis of LED Data
September: Fabrication of PMT Bases at PSU
October: Repair of Bases/Dead Channels
Fix of DAQ Runaway Problem
Hardware Review of FPDs
November: Changes to FMS Triggering
Mechanical Procedures: Closing FMS

3. Hardware Operations
Learned operation of HV, PMTs, QTs/DSMs, LED systems
Access and operation of FMS Software: masks/offsets for QTs/DSMs
DAQ/Trigger Operations: Cosmic Rays and LED data
Verified HV, LED, DAQ and Trigger Maps
System works: several people trained for operations:
Steve Heppelmann, Jinguo Ma, Len Eun + 7 PSU undergrads
Identification of dead channels
Large Cells: ~21 Dead /788 = 2.7%
~23 Gain Problems 23/788 = 2.9%
Total 44/788 = 5.6%
Small Cells: ~23 Problems 23/476 = 4.8%
After repairs est. 14/476 = 2.9%

4. FMS Event Display: Cosmic Rays
Cosmos

5. LED Data: Identify Gain Shifts/Dead Channels/HV Gain Curves (Zero Field)

6. FMS Problem Channels

7. Constant ET gains Large cell gains in the range 0.0450 GeV/chan to
can be configured for constant
ET = GeV/chan
Small cell gains in the range
GeV/chan to
GeV/chan
can be configured for constant
ET = GeV/chan
Full-scale ET = 27 GeV/c for large cells and 13.5 GeV/c for small cells
Same channel gains provide constant ET independent of zvertex
Actual ET/channel is higher(lower) for positive(negative) zvertex
FMS Trigger Update III

8. Proposed scheme
Eight overlapping jet patches (JP), each covering ~900 in azimuth
Large enough patches with sufficient overlap to “catch everything”
Maximize the efficiency for the rare, highest energy events
Board sum (BSum) triggers
Approximate capabilities of the current cluster trigger
Provide efficiency for “inclusive … meson” measurements at lower energies where the JP trigger rates would be too high
High tower triggers
For calibration and diagnostics
Possible di-jet and J/ψ trigger (two non-adjacent JP0 patches)
FMS Jet Patch Trigger

9. Anticipated rates for constant ET calibration
For scale, ET = 4.3 GeV/c corresponds to an energy of
91 GeV at η = 3.75
39 GeV at η = 2.9
FMS Trigger Update III

10. A possible strategy for the transverse period
600 Hz, essentially all fast-detector events, is a very reasonable FMS bandwidth allocation for the transverse period
Allocate
200 Hz to JP triggers
200 Hz to small cell BSum triggers
100 Hz to large cell BSum triggers
Set take-all thresholds to saturate the bandwidth at ~3.5 MHz pp collisions (expected max lumi at end of transverse period)
Set prescale thresholds fill bandwidth while accepting 1/10 at ~1.7 MHz pp collisions (expected ave lumi for weeks 2-4)
Allocate 100 Hz for remaining triggers (HT, FPDE, di-jet, etc.)
What was the FPD gain/channel during Run 9?
FMS Gains and Trigger

11. Run 11 Projections: 20 pb-1

12. Problems Ahead Cannot produce real gain curves now:
Requires DX/STAR magnets on.
Requires beam time.
Must calibrate at beginning of pp run.
Transverse run is before longitudinal
Must solve “runaway” DAQ problem
Operate FPD in October (Jingguo and Stephen)
Mechanical movement of FMS/FPD
Fix FMS small cell PMTs
Recable/Reprogram FMS trigger