ACS FM Scientific Measurements Results

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ACS FM Scientific MeasurementsResults

• SPI Team Meeting, Garching, 29.6.2000
• MPE Andreas von Kienlin

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UCR mercury-source
UCR-left 06090748 Hg _at_ UCR-2-5 279 keV Hv
nom Rate3
UCR-left 06090742 Hg _at_ UCR-2-2 279 keV Hv
nom Rate3
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UCR
UCR-left 06081921 Cs_at_ UCR-2-2 662 keV Hv nom Rat10
UCR-left 06081914 Cs _at_ UCR-2-5 662 keV Hv
nom Rate10
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LVS
LVS-right 06260944 Hg top 279 keV Hv nom Rate10
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LVS

• LVS-right
• 06260907
• Cs top
• 662 keV
• Hv nom
• Rate15

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LVS
LVS-right 06260944 Hg - bottom 279 keV Hv
nom Rate10
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LVS
LVS-right 06260907 Cs bottom 662 keV Hv
nom Rate15
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ACS FM Measurement Plan

• Intention of ACS FM measurements
• opportunity for MPE to check if ACS works as
  specified
• important parameters for the later adjustment and
  operation of the ACS will be measured
• Important scientific parameters of the ACS
• energy-threshold calibration
• figure of merit of BGO crystals (light yield)
• determination of the threshold function
• processing time and jitter
• Measurement plan described in SPI-MPE-PL-12-32

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Procedure for ACS FM Measurements on chain
level (BGO, PMT, FEE, VCU)

• Connecting left PMT of BGO unit to assigned FEE
  (right PMT disconnected)
• Acquisition of energy spectra with left chain
• Measurement of processing time and jitter with
  left chain

• Functional tests with left chain (overrange veto,
  oscillation suppression, ..)
• same measurements with right PMT

energy-threshold calibration, figure of merit
(BGO), processing time and jitter for all half
chains
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Procedure for ACS FM Measurements on
subassembly level (UCR, LCR, SSA, LVS)

• BGO unit with both PMTs connected
• energy spectra
• processing time and jitter
• Complete subring
• adjustment of the delays of all BGO chains
• measurement with all units connected together in
  one subring
• Complete subassembly (UCR, ...)
• adjustment of the delays of the 3 subrings to a
  common UCR delay
• measurement of energy spectra, processing time
  and jitter of the complete subassembly
• functional test of burst mode

• UCR Test with each UCR subring
• 6 detection units connected together

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MPE preparations for ACS FM Measurements

• Tagged ?-ray sources for timing measurements ?
  suitable for thermal vacuum (TV) - tests
• PMT
• NE 110 plastic scintillator cylinder
• surrounded with ? - active foil (241Am or 60Co)
• temperatures from -10?C to 60?C
• HV (10-6 Torr)