15-19 April 2018
Paradise Point Resort & Spa
America/Los_Angeles timezone

8.19 Design of tangential multi-energy soft x-ray pin-hole cameras for tokamak plasmas

17 Apr 2018, 16:00
1d 2h
Paradise Point Resort & Spa

Paradise Point Resort & Spa

1404 Vacation Rd, San Diego, CA 92109

Speakers

Hibiki Yamazaki (The University of Tokyo) Luis F. Delgado-Aparicio (Princeton Plasma Physics Laboratory) Rich Groebner (General Atomics) Kenneth Hill (Princeton Plasma Physics Laboratory) Novimir Pablant (Princeton Plasma Physics Laboratory) Brentley Stratton (Princeton Plasma Physics Laboratory) Philip Efthimion (Princeton Plasma Physics Laboratory) Yuichi Takase (The University of Tokyo) Akira Ejiri (The University of Tokyo) Masayuki Ono (Princeton Plasma Physics Laboratory)

Description

A new tool has been developed to calculate the spectral, spatial and temporal response of multi-energy soft x-ray (ME-SXR) pinhole cameras for arbitrary plasma densities (ne,D), temperature (Te) and impurity densities (nZ). ME-SXR imaging provides a unique opportunity for obtaining important plasma properties (e.g. Te, nZ and Zeff) by measuring both continuum- and line emission in multiple energy ranges. This technique employs a pixelated x-ray detector in which the lower energy threshold for photon detection can be adjusted independently. The simulations performed assumes a tangential geometry and DIII-D like plasmas (e.g. ne,0~1.0x10^20 m^-3 and Te,0~5 keV) for various impurity (e.g. C, O, SiC, Ar, Ca, Mo and W) density profiles. The computed brightnesses range from few 10^2 to 10^3 counts/ms/pixel depending on the cutoff-energy thresholds, for a maximum count rate of 10 MHz per pixel. These estimates were obtained using FLYCHK x-ray emissivities for arbitrary plasma densities, temperatures between 0.2 and 10 keV, and photon energies between 1 and 50 keV. The XOP code was used to evaluate the x-ray attenuation in various materials (e.g. Be, Al, Si). The typical spatial resolution in the mid-plane is ~1 cm with a photon-energy resolution of 500 eV at a 500 Hz frame rate.

Primary author

Hibiki Yamazaki (The University of Tokyo)

Co-authors

Luis F. Delgado-Aparicio (Princeton Plasma Physics Laboratory) Rich Groebner (General Atomics) Kenneth Hill (Princeton Plasma Physics Laboratory) Novimir Pablant (Princeton Plasma Physics Laboratory) Brentley Stratton (Princeton Plasma Physics Laboratory) Philip Efthimion (Princeton Plasma Physics Laboratory) Yuichi Takase (The University of Tokyo) Akira Ejiri (The University of Tokyo) Masayuki Ono (Princeton Plasma Physics Laboratory)

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