Design of a tomographic hard X-ray spectrometer as long as suprathermal electron studies with ECRH Tomographic reconstruction in addition to diagnostic validation Conclusions Overview of experimental results Proposed hard X-ray spectrometric system

Design of a tomographic hard X-ray spectrometer as long as suprathermal electron studies with ECRH Tomographic reconstruction in addition to diagnostic validation Conclusions Overview of experimental results Proposed hard X-ray spectrometric system www.phwiki.com

Design of a tomographic hard X-ray spectrometer as long as suprathermal electron studies with ECRH Tomographic reconstruction in addition to diagnostic validation Conclusions Overview of experimental results Proposed hard X-ray spectrometric system

Zinko, Carolyne, Features Writer has reference to this Academic Journal, PHwiki organized this Journal Design of a tomographic hard X-ray spectrometer as long as suprathermal electron studies with ECRH Tomographic reconstruction in addition to diagnostic validation Conclusions Overview of experimental results Proposed hard X-ray spectrometric system The ECCD in addition to ECRH system in TCV Introduction in addition to motivations Electron cyclotron resonance heating (ECRH) in addition to current drive (ECCD)[1], disruptive instability events in addition to sawtooth activity have been demonstrated to produce suprathermal electrons in fusion devices[2]. The importance of these phenomena as long as fusion reactors renders suprathermal electron generation in addition to dynamics a key topic in the physics of burning plasmas[3]. Here some significant results from the TCV tokamak[4] are briefly reviewed in addition to a preliminary design of a novel tomographic hard X-ray spectrometer proposed as long as TCV is discussed. The design is aided by simulations of tomographic reconstruction. Spectrometer: main parameters Detectors[10]: CdTe (or CZT) Dimensions: 1mm X 1mm area X 2mm thickness Detector per camera: ~ 35-40 Number of cameras: from 2 to 9 (trade-off between benefits as long as tomographic reconstruction in addition to costs) Collimator design: Divergent Soller collimator[11] with radial detector array Tungsten metal foil enables good photon stopping power with compact size. The design of the collimator aperture can be adjusted as long as each single detector in order to control the étendue in addition to its relative line spread in the plasma region. The spatial resolution of the system is related to the typical chord separation in the plasma region that is ~2cm. The extreme compactness in addition to flexibility of this design enable it to be adapted to other fusion devices. Fast electron broadening from transport observed in many ECRH discharges (resulting in ECCD profile broadening) [6] The HXR camera on loan from TORE SUPRA [8] Now definitively reclaimed Clearly evidenced the LFS-HFS asymmetry of the poloidal bremsstrahlung distribution (possibly related to trapped particles) Other diagnostics used: high-field-side electron cyclotron emission (ECE) radiometer [9] oblique ECE diamagnetic loop coil New diagnostics being installed: Tangential HXR camera Vertical ECE Tomographic reconstruction enables to visualize in addition to determine quantitatively the detailed evolution of the 2D shape of the emitting structure in the plasma as a result of diffusion phenomena, instabilities or other perturbations as well as of ECRH in addition to ECCD deposition. Spatial resolution: 2 cm Time resolution: down to 1 ms Energy resolution: ~ 5keV at 60keV of photon energy Energy range: 20-200 keV Compact in addition to flexible camera design, wide coverage as long as plasmas at different vertical locations The power emitted by the plasma along the chord L(,) is: The chord brightness: is independent of the particulars of detector area, aperture size, etc. in addition to is there as long as e a convenient quantity to express chord-integrated data in. 3D Geometric integration 2) Thin chord approximation 5) Tomographic inversion in addition to reconstruction Several tomographic reconstructions have been per as long as med in order to validate the camera per as long as mance in recovering the shape in addition to the intensity of simulated 2D plasma emission patterns. The simulations indicate as expected an increasing in the quality of the tomographic reconstruction when cameras viewing the plasma from different directions are added. The tomographic algorithm that generates the reconstructed plasma emissivity uses the pixel grid method in addition to the minimum Fisher in as long as mation in order to condition the solution [12] Suprathermal density propagation in space after short ECCD pulses measured by HFS ECE [7] Suprathermal electron dynamics is a crucial element of ECRH physics in addition to MHD phenomena important as long as fusion A high-resolution, spectroscopic, tomographic hard X-ray camera system is being designed as long as the TCV tokamak Simulations of tomographic reconstruction from varying postulated emissivity patterns underway to determine the best detector distribution in addition to to optimize the reconstruction algorithm [1].N. J. Fisch, Rev. Mod. Phys. 59, 175 (1987). [2].P. V. Savrukin et al, Plasma Phys. Control. Fusion 48, B201 (2006). [3].R. J. La Haye et al, Nucl. Fusion 46, 451 (2006). [4].F. Hofmann et al, Plasma Phys. Conrol. Fusion 36, B277 (1994). [5].S. Coda et al, 28th EPS conference on Control. Fusion in addition to Plasma Phys. Funchal, 18-22 June 2001. ECA Vol.25A, 301 (2001). [6].S. Coda et al, Nucl. Fusion 43, 1361 (2003). [7].S. Coda et al, Plasma Phys. Conrol. Fusion 48, B359 (2006). [8].Y. Peysson, S. Coda, F. Imbeaux, Nucl. Inst. Meth. A 458, 269 (2001). [9]. I. Klimanov et al, Plasma Phys. Control. Fusion 49, L1 (2007). [10].T. Takahashi in addition to S. Watanabe, IEEE Trans. Nucl. Sci. 48, 950 (2001). [11].W. Soller, Phys. Rev. 24, 158 (1924). [12].M. Anton et al, Plasma Phys. Control. Fusion. 38, 1849 (1996). References:

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