high energy focusing telescope (heft)
DESCRIPTION
High Energy Focusing Telescope (HEFT). Caltech Space Radiation Laboratory Aleksey Bolotrikov, Hubert Chen, Walter R. Cook, Fiona Harrison, Peter Mao, Steve Schindler. Columbia Astrophysics Laboratory Jim Chonko, Mario Jimenez-Gerate * , Chuck Hailey, Jason Koglin , David Windt, Haitao Yu. - PowerPoint PPT PresentationTRANSCRIPT
Jason Koglin, APS/HEAD, April 2002
High Energy Focusing High Energy Focusing Telescope (HEFT)Telescope (HEFT)Caltech Space Radiation LaboratoryAleksey Bolotrikov, Hubert Chen, Walter R. Cook, Fiona Harrison, Peter Mao, Steve Schindler
*Currently at MIT
Columbia Astrophysics LaboratoryJim Chonko, Mario Jimenez-Gerate*, Chuck Hailey, Jason Koglin, David Windt, Haitao Yu
Danish Space Research InstituteFinn Christensen, Carsten Jensen
Lawrence Livermore National LaboratoryBill Craig, Kurt Gunderson, Klaus Ziock
Jason Koglin, APS/HEAD, April 2002
HEFT Science Imaging and spectroscopy of 44Ti emissions and non-thermal continuum in young Supernova remnants
Sensitive hard X-ray observations of obscured Active Galactic Nuclei (AGN)
Spectroscopic observations of accreting high-magnetic field pulsars
Galactic Center: observe compact objects in outburst/quiescence
Jason Koglin, APS/HEAD, April 2002
Supernova 44Ti with 68 and 78 keV nuclear transitions.
Synthesized near the mass cut (the boundary between the innermost ejecta and the material that falls back to form the collapsed remnant). Production and ejection sensitive to explosion mechanism and ejecta dynamics.
Map Density and velocity distribution.
Jason Koglin, APS/HEAD, April 2002
Instrument Overview Conic-approximation Wolter-I optics: 6 m focal length
Thermally Formed Glass Substrate: 300 um thick Depth-graded W/Si Multilayers: 20 – 70 keV
CdZnTe pixel detector resolution: 1 keV Effective Area: 250 cm2 @ 40 keV Over-constrained optics: 1’ HPD
Field of view: 17’ @ 20 keV Pointing stability: 20”
Jason Koglin, APS/HEAD, April 2002
HEFT Flight Assembly
Jason Koglin, APS/HEAD, April 2002
Multilayer Coated Glass OpticsThermally Formed Glass Reasonable cost Thin and light weight Low surface roughness Mass producible
8 ovens at Columbia 1.5 technicians >1 optics layer/day
Q u ar tz M an d re l G lass M icro sh ee t
(1 )
(3 ) (4 )
(2 )
W/Si Multilayer Coatings Enhanced reflectivity with broad energy acceptance High throughput at DSRI coating facility
~2 optics layers/day
Jason Koglin, APS/HEAD, April 2002
Telescope Assembly Method Each spacer layer (upper & lower) is individually machined to the precise radius and angle:
Assembly errors do not stack up < 8” assembly error contribution
Multilayer optic shells are constrained to spacers with epoxy:
Only near net shaped shells are necessary to obtain 1’ HPD performance
Fast and robust assembly process: Requires 1 tech for 1 layer/day
0 2 4 6 8 1 0A x ia l L en g th [cm ]
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a) Lay down andmachine graphite spacers
c) Lay down andmachine graphite spacers
b) Lay down glass
d) Lay down glass
Jason Koglin, APS/HEAD, April 2002
Metrology Comparison
Jason Koglin, APS/HEAD, April 2002
0 5 1 0 1 5 2 0 2 5 3 0
024681 0-4 0-2 0
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O p tic A x is [ cm ]0 5 1 0 1 5 2 0 2 5 3 0
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A z im u th [d eg re e ]
O p tic A x is [c m ]
Laser Scanner vs. LVDTa) Laser Raw
c) Laser Phase Error Removed d) LVDT Phase Error Removed
b) LVDT Raw
Jason Koglin, APS/HEAD, April 2002
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Optics Development
HPD = 31”
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51” Prototype with200 m thick glass
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39” Prototype with200 cm segments
HPD = 30”
Example: Example:
Jason Koglin, APS/HEAD, April 2002
Achievements Utilized surrogate mounts at Columbia for R&D Demonstrated < 8” assembly machine error Demonstrated consistency of X-ray, UV & LVDT metrology methods Correlated free-standing (Laser) and mounted glass (LVDT) 1.0’ HEFT prototype optic using 300 m thick glass substrates 51” optic using 200 m thick glass – meets Con-X HXT requirement 39” optic using short glass segments
In-depth data analysis and FEA of glass mounting (with LLNL) Improve thermal glass slumping process and characterization New and improved multilayer coatings up to 170 keV (D. Windt) Collaborate with GSFC on mounting Epoxy Replicated Thermally Formed Glass (W. Zhang) Next generation substrates: mandrel-less forming, graphite thermo-vacuum forming, VELCRO, Si wafer Improve assembly machine to ~3” with true Wolter-I parabolic/ hyperbolic geometry
Research Directions