Design Parameters and Objectives of a High-Resolution X-ray Imaging Crystal Spectrometer for the Large Helical Device (LHD)
Authors: M. Bitter, K. Hill, D. Gates, H. Neilson, A. Reiman, A.L. Roquemore, S. Morita, M. Goto, H. Yamada and J. Rice
Abstract:
A high-resolution X-ray imaging crystal spectrometer, whose instrumental concept was thoroughly tested on NSTX and Alcator C-Mod, is presently being designed for LHD. The instrument will record spatially resolved spectra of helium-like Ar16+ and provide ion temperature profiles with spatial and temporal resolutions of 1 cm and > 10 ms which are obtained by a tomographic inversion of the spectral data, using the stellarator equilibrium reconstruction codes, STELLOPT and PIES. Since the spectrometer will be equipped with radiation hardened, high count rate, PILATUS detectors,, it is expected to be operational for all experimental conditions on LHD, which include plasmas of high density and plasmas with auxiliary RF and neutral beam heating. The special design features required by the magnetic field structure at LHD will be described.
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Submitted to: Review of Scientific Instruments (May 2010)
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Download PPPL-4514 (pdf 216 KB 17 pp)
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