Laboratory Astrophysics using an Engineering Model XRS Microcalorimeter Array NASA/GSFCLLNL. F. Scott PorterPeter Beiersdorfer Keith GendreauGreg Brown.

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Presentation transcript:

Laboratory Astrophysics using an Engineering Model XRS Microcalorimeter Array NASA/GSFCLLNL. F. Scott PorterPeter Beiersdorfer Keith GendreauGreg Brown Kevin Boyce Andy SzymkowiakColumbia. Richard KelleySteve Kahn Caroline Stahle John Gygax Regis Brekosky SPIE, San Diego, CA, August 4, 2000

XRS Engineering Model: Detector Characteristics: 32 instrumented pixels, 0.64 x 0.64 mm/each  13.1 mm 2 total Implanted Si thermistors/FET read out HgTe absorbers, >95% Q.E. at 6 keV Spectral resolution: 8-9 eV at 3.3 keV and 9-11 eV at 5.9 keV Operating temperature = 60 mK using an adiabatic demagnetization refrigerator Bandpass: 0.2 to > 12 keV

The XRS on Astro-E

Laboratory Calorimeter Instrument Monochrometer Calibration Beam Line EBIT

The EBIT machine Monoenergetic electron beam produces nearly pure charge states Fast energy sweeping gives an excellent approximation to a Maxwellian electron temperature. Can inject most elements using a gas injector and a metal vapor vacuum arc (MeVVA). Our experiments are simultaneous measurements using the microcalorimeter and usually 3 or 4 x-ray crystal spectrometers. MeVVA (metal vapor vacuum arc) Electron Gun Drift Tubes Helmholtz coils Trap Ions e-e- Micro Calorimeter x-ray

Calibration: the MOST important component XRS calorimeters are extremely uniform: RTS fluorescence source: Response function: Spectral redistribution Energy scale Filter transmission

TruFocus x-ray tube, Au target measure O and Al edges in-situ: Filter Calibration: One of four aluminum on polymide infrared blocking filters (manufactured by Luxel Corporation)

Measured filter transmission function

Preliminary XRS/EBIT results: K shell emission from He-like Fe XXV:

Microcalorimeter Grating L shell emission from Fe XXIII and XXIV:

Phase resolved spectroscopy: The EBIT cycles from ion injection through ion trapping to ion dump every few seconds For Fe, the plasma is charging up for the first 0.5 seconds Using a GPS time sync system we phase fold the x-ray events. Phase folding is required to do equilibrium AND non- equilibrium plasma studies.

Thermal equilibrium: Maxwellian electron distributions Maxwellian approximation with a monoenergetic electron beam Microcalorimeter spectrum of a Maxwellian plasma, = 2.2 keV. Note Fe XVII-XXIV L shell emission.

Conclusions: We have successfully constructed a portable laboratory instrument using XRS engineering model components. We have successfully attached the XRS/EBIT instrument to the EBIT machine at LLNL and been running 24/7 for more than two weeks. Many, many experiments on L and K shell Fe with both monoenergetic and Maxwellian electron distributions. Phase resolved spectroscopy of non-equilibrium plasmas. We continue to run over the next few weeks to months in this observation cycle.

Single Bilinear pixel