Tomi Ylinen

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GLAST beam test at CERN

• Tomi Ylinen
• Kungliga Tekniska HögskolanHögskolan i Kalmar

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Outline

• GLAST
• Beam test at CERN
• Beam test analysis
• Summary

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GLAST
GLASTBeam testAnalysisSummary

• International collaboration to construct a
  gamma-ray satellite, with members from USA,
  Italy, France, Japan, Sweden
• Swedish GLAST consortium
• KTH, Stockholm University, Kalmar University
• L. Bergström, S. Carius, P. Carlson, J. Conrad
  (coordinator), J. Edsjö, S. Larsson, A. Pohl, F.
  Ryde, A. Sellerholm, T. Ylinen
• Science topics GRBs, dark matter, beam test
  analysis

GLAST beam test at CERN Tomi Ylinen
Partikeldagarna in Uppsala 20.10.2006
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GLAST
GLASTBeam testAnalysisSummary
Gamma-ray Large Area Space Telescope
Large Area Telescope (LAT)
Gamma-ray Burst Monitor (GBM)

• Combined energy range 10 keV 300 GeV

GLAST beam test at CERN Tomi Ylinen
Partikeldagarna in Uppsala 20.10.2006
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GLAST
GLASTBeam testAnalysisSummary

EGRET Energetic Gamma-ray
Experiment Telescope
GLAST beam test at CERN Tomi Ylinen
Partikeldagarna in Uppsala 20.10.2006
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LAT status
GLASTBeam testAnalysisSummary

• Construction and assembly of the LAT instrument
  has been finished at SLAC
• Environmental testing (TVAC) has been performed
  at the Naval Research Laboratory (NRL)
• Integration with space craft is now in progress
  in Arizona
• Launch in fall 2007

GLAST beam test at CERN Tomi Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Simulations
GLASTBeam testAnalysisSummary

• Simulations well developed. Data Challenge 2, 55
  days of full sky simulations for LAT finished

GLAST beam test at CERN Tomi Ylinen
Partikeldagarna in Uppsala 20.10.2006
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GLAST beam test
GLASTBeam testAnalysisSummary

• Beam test at CERN approved by GLAST 2005
  Collaboration Meeting
• Build a fraction of the LAT using available
  flight spare modules (Calibration Unit - CU)
• Expose CU to variety of beams (?, e-, e, p, p)
  and measure performance
• Beam request submitted to CERN in October 2005
• Final CERN schedule (delivered 26/6/2006)
  allocates
• 4 weeks at PS/T9 area, 26/7-23/8
• 11 days at SPS/H4 area, 4-15/9
• Goal Validate full LAT Monte-Carlo simulation

GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Calibration Unit (CU)
GLASTBeam testAnalysisSummary

• Scaled down version of LAT, with 2 tracker
  towers and 3 calorimeters (flight spares)

ACD-tiles
TKR 8
TKR 16
dummy
CAL 119
CAL 109
CAL 101
rotation table
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Experimental areas
GLASTBeam testAnalysisSummary

• SPS H4 line
• Prevessin (FR)
• e, p, p 10-280GeV

• PS T9 line
• Meyrin (CH)
• ?, e, p, p 0.5-10GeV

GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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PS setup
GLASTBeam testAnalysisSummary
CU
magnet
beam
dump
direction, conversion
magnet
particleidentification
triggering
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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SPS setup
GLASTBeam testAnalysisSummary
beam
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Event display
GLASTBeam testAnalysisSummary
?
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Data analysis
GLASTBeam testAnalysisSummary
B. Lott
Monte CarloData
layer 1
layer 2

• 75 million events taken
• Layerwise full bremsstrahlung energy spectrum
  from the calorimeter
• Just a quick look.A more thorough analysis
  coming soon

layer 4
layer 3
Counts
layer 6
layer 5
layer 8
layer 7
500 MeV
Energy
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Swedish interests
GLASTBeam testAnalysisSummary

• Compare tracker and calorimeter reconstructions
  for direction and position
• In the TKR, clustering of neighbouring hits in
  strip sheets is used for reconstruction
• In the CAL, reconstruction uses moments analysis
  to construct an ellipsoid

Simplified and exaggerated!
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Summary
GLASTBeam testAnalysisSummary

• LAT is ready for integration with spacecraft
• Two beam tests were performed at CERN, at 0.5-10
  GeV and at 10-280 GeV, using beams of ?, e-, e,
  p and p
• About 75 M events taken in total
• Data analysis is ongoing. Much work remains but
  results are expected soon

GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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• Thank you!

GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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PS setup (spare)
GLASTBeam testAnalysisSummary
CU
magnet
beam
dump
direction, conversion
magnet
particleidentification
triggering
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006
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Reconstruction (spare)
GLASTBeam testAnalysisSummary
GLAST beam test at CERN T. Ylinen
Partikeldagarna in Uppsala 20.10.2006