Electron cyclotron emission diagnostic for ITER

Rowan, W.; Austin, M.; Beno, J.; Ellis, R.; Feder, R.; Ouroua, A.; Patel, A.; Phillips, P.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D935
Academic Journal
Electron temperature measurements and electron thermal transport inferences will be critical to the nonactive and deuterium phases of ITER operation and will take on added importance during the alpha heating phase. The diagnostic must meet stringent criteria on spatial coverage and spatial resolution during full field operation. During the early phases of operation, it must operate equally well at half field. The key to the diagnostic is the front end design. It consists of a quasioptical antenna and a pair of calibration sources. The radial resolution of the diagnostic is less than 0.06 m. The spatial coverage extends at least from the core to the separatrix with first harmonic O-mode being used for the core and second harmonic X-mode being used for the pedestal. The instrumentation used for the core measurement at full field can be used for detection at half field by changing the detected polarization. Intermediate fields are accessible. The electron cyclotron emission systems require in situ calibration, which is provided by a novel hot calibration source. The critical component for the hot calibration source, the emissive surface, has been successfully tested. A prototype hot calibration source has been designed, making use of extensive thermal and mechanical modeling.


Related Articles

  • Electron Temperature Gradient Mode Transport. Horton, W.; Kim, J.-H.; Hoang, G. T.; Park, H.; Kaye, S. M.; LeBlanc, B. P. // AIP Conference Proceedings;5/14/2008, Vol. 1013 Issue 1, p299 

    Anomalous electron thermal losses plays a central role in the history of the controlled fusion program being the first and most persistent form of anomalous transport across all toroidal magnetic confinement devices. In the past decade the fusion program has made analysis and simulations of...

  • Commissioning of electron cyclotron emission imaging instrument on the DIII-D tokamak and first data. Tobias, B.; Domier, C. W.; Liang, T.; Kong, X.; Yu, L.; Yun, G. S.; Park, H. K.; Classen, I. G. J; Boom, J. E.; Donné, A. J. H.; Munsat, T.; Nazikian, R.; Van Zeeland, M.; Boivin, R. L.; Luhmann, N. C. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D928 

    A new electron cyclotron emission imaging diagnostic has been commissioned on the DIII-D tokamak. Dual detector arrays provide simultaneous two-dimensional images of Te fluctuations over radially distinct and reconfigurable regions, each with both vertical and radial zoom capability. A total of...

  • 2D electron cyclotron emission imaging at ASDEX Upgrade (invited). Classen, I. G. J.; Boom, J. E.; Suttrop, W.; Schmid, E.; Tobias, B.; Domier, C. W.; Luhmann, N. C.; Donné, A. J. H.; Jaspers, R. J. E.; de Vries, P. C.; Park, H. K.; Munsat, T.; García-Muñoz, M.; Schneider, P. A. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D929 

    The newly installed electron cyclotron emission imaging diagnostic on ASDEX Upgrade provides measurements of the 2D electron temperature dynamics with high spatial and temporal resolution. An overview of the technical and experimental properties of the system is presented. These properties are...

  • Emissive probe measurement of electron temperature in high-pressure plasmas (≥1 mTorr). Shindo, Haruo; Konishi, Masayoshi; Tamaru, Takeshi // Review of Scientific Instruments;Sep88, Vol. 59 Issue 9, p2002 

    A new method was investigated to determine the electron temperature with the emissive probe. The basis of the method is the use of a functional relationship between the floating potential and the heating voltage of the emissive probe. A new expression for the change of the floating potential was...

  • Blob birth and transport in the tokamak edge plasma: Analysis of imaging data. Myra, J. R.; D’Ippolito, D. A.; Stotler, D. P.; Zweben, S. J.; LeBlanc, B. P.; Menard, J. E.; Maqueda, R. J.; Boedo, J. // Physics of Plasmas;Sep2006, Vol. 13 Issue 9, p092509 

    High-speed high-spatial-resolution data obtained by the gas puff imaging (GPI) diagnostic on the National Spherical Torus Experiment [M. Ono, M.G. Bell, R.E. Bell et al. Plasma Phys. Control. Fusion 45, A335 (2003).] is analyzed and interpreted in light of recent theoretical models for...

  • Interplay between transport barriers and density gradient. Sarazin, Y.; Grandgirard, V.; Dif-Pradalier, G.; Garbet, X.; Ghendrih, Ph. // Physics of Plasmas;Sep2006, Vol. 13 Issue 9, p092307 

    The present paper addresses two critical issues of zonal flows: the evidence of control parameters of their driving term, namely the Reynolds stress, and how they back-react on turbulence and transport. Kinetic nonlinear simulations are performed with the GYSELA code [V. Grandgirard et al., J....

  • Frequency and angular distribution of electron cyclotron emission at high temperatures (100–500 keV). Bornatici, M.; Ruffina, U.; Spada, M. // Physics of Fluids B: Plasma Physics;May90, Vol. 2 Issue 5, p874 

    The distribution of the electron cyclotron emission with respect to both the frequency and the viewing angle is analyzed for a loss-cone as well as an anti-loss-cone electron distribution function at temperatures between 100 and 500 keV. The accuracy of two approximate formulas for the...

  • A possibility of plasma current density measurements using suprathermal electron Bremsstrahlung emission. Kantor, M. Yu. // Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p1162 

    Soft x-ray Bremsstrahlung emission of suprathermal electrons is commonly used for electron temperature measurements in plasma experiments. A difference between suprathermal and bulk electron distributions results in a discrepancy between the measured and real electron temperatures. This is...

  • Directed fast electron beams in ultraintense picosecond laser irradiated solid targets. Ge, X. L.; Lin, X. X.; Yuan, X. H.; Carroll, D. C.; Gray, R. J.; Yu, T. P.; Tresca, O.; Chen, M.; Liu, F.; Zhuo, H. B.; Zielbauer, B.; Zhao, L.; Neely, D.; Sheng, Z. M.; Li, Y. T.; McKenna, P. // Applied Physics Letters;8/31/2015, Vol. 107 Issue 9, p1 

    We report on fast electron transport and emission patterns from solid targets irradiated by s-polarized, relativistically intense, picosecond laser pulses. A beam of multi-MeV electrons is found to be transported along the target surface in the laser polarization direction. The spatialintensity...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics