Spatially Resolved High Resolution X-Ray Crystal Spectrometry and Radiation Tolerant 2D X-Ray...

Spatially Resolved High Resolution X-Ray Crystal Spectrometry and Radiation Tolerant 2D X-Ray Imaging Schemes for ICF Plasmas including NIF Ignition Experiments

• Continuously spatially resolved high resolution x-ray spectra

• Simple – 1 spherically bent crystal and 1 2D detector

• Has revolutionized physics of self-generated flows and thermal transport in tokamaks

• Mature diagnostic – deployed on 7 spectrometers in 4 countries

• Primary diagnostic for ion temperature and rotation profiles on ITER

• We are doing the ITER conceptual design

• Will work for HED plasmas

• Would allow extensive shielding against neutrons for NIF ignition experiments

• Two dimensional x-ray imaging

• Matched pair of spherical crystals

• 10,000 times larger solid angle than pinhole imager

• Magnification possible

• Will allow extensive shielding of line-of-sight neutrons and detector for NIF ignition

• High efficiency of x-ray detection – no conversion losses

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Spherically bent crystal wavelength-disperses x rays horizontally and images them vertically

Bragg relation =2d sin)

Spherically bent crystal

Rotational axis of symmetry

Sagittal focalline

C-Mod spectral image

Verticalfocus

fm=R sin

Astigmatism can be eliminated by using a matched pair of spherically bent crystals

objectimage

Concave crystal

convexcrystal convex-concave pair

provides magnification

Schemes tested in visible light.

To be tested with x rays.

1D imaging x-ray spectrometer and 2D x-ray imager with spherical crystals can be well shielded against NIF neutrons

K. W. Hill OLUG 4/2012 4