GLAST LAT Project I&T Integration Kickoff Meeting 03/09/04 4.1.9.7 - Particle Test 1 GLAST Large Area Telescope: Particle Test “Roadmap to Integration”

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Presentation transcript:

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 1 GLAST Large Area Telescope: Particle Test “Roadmap to Integration” March 9th, 2004 Gary Godfrey SU-SLAC Sub-sub-system Manager Gamma-ray Large Area Space Telescope

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 2 The Equipment Van de Graff –100% uptime during EM test –Typically 1 x 10 3  /sec into 4  ster BGO Monitor –100% uptime during EM test Cosmic Ray Scintillator Telescope (24” x 24”) –100% uptime during EM test

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 3 Van de Graff EM Results BGO spectra –VG off (blue) – see cosmics –VG on (red) – see  ’s + cosmics EM sees photons –Tracks point back at target –EM effic for  is as expected –EM psf is as expected # of  s   Energy [Mev] Where Tracks Pass Through Target Plane ~0° Effic =  per steradian seen in EM  per steradian seen in BGO = 1200/(.02 x 2  ster) 1152 sec x Hz /(.15 ster) =.093 ±.01 (due to ±5% BGO dist error)  68 Measured = acos(.88) = 28° (at 0°)  95 Measured = acos(.46) = 63° (at 0°)  target ~ (.75”/2.0”) x (180/  ) = 21°  68 EM PSF ~ sqrt(  68 Measured 2 -  target 2 ) = 21°  95 EM PSF ~ sqrt(  95 Measured 2 -  target 2 ) = 59°

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 4 Van de Graff Rates VG1 Typically achieved For BGO and EM2 [Hz] VG2 (Oil Free) Calculated maximum (not yet demonstrated) [Hz]  rate into Ω=4  sr BGO rate Effic x Ω =.15 sr 1212 x 10 3 EM2 Tkr Trig rate Effic x Ω =.31 sr 2525 x 10 3 LAT Tkr Trig rate Effic x Ω = 3.1 sr x 10 3 Van de Graff has been upgraded to VG2 which has oil free Turbo and Scroll pumps. The interior has also been cleaned of all residual oil. VG2 should be able to saturate EM2 and LAT trigger rates.

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 5 Summary of Data to Be Taken SourceTriggerTotal Triggers WhyRate [Hz] Run Time [Hours] Each TowerCosmics3-in-row5 x 10 5 Compare Towers 208 CosmicsScintillator Telescope 5 x 10 5 Efficiency624 Full LATCosmicsVarious Trigs (FilterOFF) 10 7 TKR survey ACD Effic CosmicsOrbit Trig (Filter ON) 10 7 Filter Effic20016 Van de GraffOrbit Trig (Filter OFF) Mev calib MC 200 VG1 16 Van de GraffOrbit Trig (Filter ON) 10 8 Performance at orbit rates 10,000 VG2 8 “End Too End Test Committee” report will cause this table to be modified.

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 6 Procedures to be Written Completion Date Procedure to setup 3-in-row trigger and tower to acquire cosmic data 6/15/2004 Procedure to setup scintillator telescope and tower to aquire cosmic ray data 7/1/2004 Procedure to run Van de Graff7/1/2004 Procedure to setup Van de Graff and LAT and take data 8/15/2004

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 7 Spare Parts Ordering Spare PartsOrder by Belt (Van de Graff)4/15/2004 Capacitor (ceramic variable tuning)Have(1) Choke (RF HV) Stancor C H 1500 V 85W 200 mA DC4/15/2004 Diode (Focus HV)Have(2) Gas (SF 6 cylinder)4/15/2004 HV supply (belt charging)Have(1) Motor (Control rod)Have(2) Pump (scroll)4/15/2004 Pump (turbo)4/15/2004 Relay (Delay) Amperite 5N030T 9 pin4/15/2004 Resistor (Column) 625 M  Have(4) Resistor (Probe tip) 100K 25WHave(3) Resistor (Focus) 2 M  15% 4/15/2004 Rheostat (Control Rod)4/15/2004 Screen (charging)4/15/2004 Spare source bottle repair4/15/2004 Springs (column)Have(5) Transformer (Probe tip) P-1079 TT-5479 (70,100,115) ->1700 v 5 mA4/15/2004 Transformer (Focus HV) P TT /400 Hz (95,110,125,135)->15 kV 10mA4/15/2004 Transformer (RF HV) P-9321 TT-5494 (95,115,135)-> V 400 mA, 6.3 V 5 A4/15/2004 Tube (5T4)4/15/2004 Tube (6146)Have(3)

GLAST LAT Project I&T Integration Kickoff Meeting 03/09/ Particle Test 8 Verification of Equipment Readiness Completion Date Verify VG2 high rate capability3/19/2004 Verify operation of VG by recording BGO spectrumBi-weekly Verify operation of scintillator telescope by recording cosmic rate Bi-weekly