Summary of Tracker video conference

                                                          October 17, 2005

09:00 set-up and verification of the link
09:10 TTCS status  J. van Es, Alvino/Gargiulo, He Zhenhui, M. Menichelli 40'
(10' each)
09:50 TTCS Evaporator status: Bart Verlaat/Eric Perrin (10')
10:00 Mechanics, Ladder Phase II @Ge/Pg:  Eric Perrin, Felipe da Silva,
Maria Ionica (10' each)
10:30 Electronics report: Daniel Haas,  Philipp Azzarello, Lucio Accardo
(10' each)
11:00 Planning of future tests (Taiwan/Terni) Giovanni Ambrosi (10')
11:10 Star Tracker P. Trampus, C. Gargiulo (10'each)
11:30 TRD On board code: Claude Zurbach (10'), Discussion 20'
12:00 Analysis :  Nacho (15'), Sonia (10'), Paolo (10') , Bill (10')
12:45 "Small" GSI test: Philipp (10'), Bill (10')
13:00 Tracker paper: Bill (15')
13:10 TIM preparation
13:30 Closing up

Mechanics, TTCS and Star Tracker: 				Eric, Bart and Corrado
 
  - Bolt analysis shows weak points. Some screws strengthened. Some cannot be easily modified at feet junction.
     NASA inspects. Fail safe study ongoing.
  - Fastener list and back-off prevention almost finished. Fasteners for outer plane ladders modified according to NASA
    requirements.
  - Material list submitted. Under inspection.
  - Frankenstein machine in Geneva clean area, modifications can start. Tracker dry assembly partly done.
  - Concerning possible change of launching vehicle: TIM must tell us if tracker should be assembled or not.
  - Evaporator loop is making progress, 2 inner rings produced in collaboration between Geneva and NIKHEF. Outer ring
    under production. Clamps have been produced and used in dry assembly. Hydraulic connectors implemented in
    design.
  - Piping route and box design in progress with Corrado. Valves may be suppressed also from primary box. Accumulator
    in horizontal position. Complete component position proposed, under thermal and mechanical stress analysis.
  - Star tracker: thermal tests ok, vibration test end of October. TVT in Terni to be planned. Flight model making progress.
    MLI being designed and produced.

Production:								Filipe, Maria

  - Phase II and repairs in Geneva approaching completion. 
  - Layers 2, 4, 5, 6, 7 completed and tested OK. Layer 3 in clean room now, L12 missing, recently produced.
    Thermal connection between plane and thermal bars to be installed. Finished end of November.
  - Layer 8: all ladders in Geneva, storage problem for shielded outer plane ladders. Finished end of January
  - Layer 1: 28 out of 30 ladders, in all phases. 2 last ones produced by G&A. Finished middle of March.
  - In Perugia: 4 good ladders plus all rejects. Must replace 15 long ladder, but lack of material. New sensors purchased.
    Upilex to be recovered from Cicorel (or repair marginal one). Should be finished in December. 

Electronics:								Daniel, Lucio, Philippe, and Claude

  - Go-ahead for TDR production at next TIM?
  - EMI conclusion still unclear, repeat test in Terni in November. Shielded or unshielded cables?
  - TVT in Taiwan scheduled for December 12 or in January 2006.
  - Actel reprogramming finished, additional protection implemented. Is hardware protection by diodes also needed? 
    To be decided after EMI test, damage assessment from return current and consumption estimate.
  - JINF test system in Pg. Very fast subsequent triggers (< 110 us): strange behaviour, also observed with DSP 
    calibrations. Independent of power supply. Timeout occurs before calibrations are finished, change command class.
  - Common noise subtraction and cluster finding inspected in detail, event-by-event. Potential bug in double counting
    large clusters detected. Wish list from Philippe.
  - Use JINF test system in mixed mode to read out GSI modules in beam test November 7-8: real life test.
  - TDR on board code V4: modular code, bug fix for sqrt. Two new tables with low and high thresholds, entered as 
     external parameters. Non-gaussian channel recognition prepared but not tested. Data reduction code optimized, at     
     limit of allowed CPU time. CN calculation with out attempt to cut out potential signals. Proposals: exclude very high 
     signals from CN (new table); bad chanels or VA's to be excluded in bad channel table, loaded from outside; dump full
     VA in case of very high deposited charge. To be discussed during next TIM. 

Test beam analysis:							Nacho alias Juan, Sonia, Paolo, Bill

  - CAMAC pile up rejection correctly flags double events, but also single events. Use total energy to reject pile-up.
  - Hit resolution in agreement with MC for central Gaussian. Momentum resolution agrees with simulation after clean-up 
    cuts. Additional bad runs identified, not signalled in the log-book. Small shift in energy, additional material?
  - Angular resolution OK in bending plane, broader than MC in non-bending plane. Substituted K hits? Stray field?
  - Cluster recovery works, efficiency increased to O(90-95)% without loss of resolution. Energy and angular resolution     
    under study.

TIM presentation:

  - Introduction:					Roberto (including electronics highlights) 
  - Mechanics and integration:		Eric or Divic
  - TTCS:						Johannes or He
  - Tracker performance analysis: 	Paolo
  - Gamma test beam analysis:		Nacho

Next meeting: Tracker meeting