Diagnostic options for radiative divertor feedback control on NSTX-U

"Snowflake" divertor configuration in NSTX

Divertor interferometer diagnostic for ITER

In the harsh environment of the divertor region in ITER, plasmas spanning a huge density range from 1019 to 1022 m−3 are anticipated making measurement of the electron density particularly challenging. For any reasonable wavelength choice, the total phase measured by a conventional two-color interferometer system is always 2 and therefore subject to fringe counting errors. This problem can be r...

Electron Bernstein Wave Research on CDX-U and NSTX

Mode-converted electron Bernstein waves (EBWs) potentially allow the measurement of local electron temperature (Te) and the implementation of local heating and current drive in spherical torus (ST) devices, which are not directly accessible to low harmonic electron cyclotron waves. This paper reports on the measurement of X-mode radiation mode-converted from EBWs observed normal to the magnetic...

Integrated models to study the impact of ELMs and disruptions on lithium in the NSTX divertor

Lithium as a potential plasma-facing material has many attractive features including a reduction in recycling of hydrogenic species and ability to withstand high heat and neutron fluxes in fusion reactors. Recent analysis of the National Spherical Torus eXperiment (NSTX) device has shown significant and recurring benefits of lithium coatings on plasma-facing components performance. To self-cons...

Radiative U(1S) decays

J. Alexander, M. Artuso, C. Bebek, J. Byrd, K. Berkelman, E. Blucher, D. G. Cassel, E. Chen, D. M. CoS'man, T. Copie, G. Crawford, J. W. DeWire, P. S. Drell, R. Ehrlich, R. S. Galik, B.Gittelman, S. W. Gray, A. M. Hailing, D. L. Hartill, B. K. Heltsley, J. Kandaswarny, R. Kowalewski, D. L. Kreinick, Y. Kubota, J. D. Lewis, N. B. Mistry, J. Mueller, R. Namjoshi, S. Nandi, E. Nordberg, C. O' Grad...