15 citations · 61 across the 12 of their papers we have counts for
12 papers
Topology optimization of permanent magnets for stellarators
Caoxiang Zhu, Kenneth Hammond, Thomas Brown +5
We introduce a topology optimization method to design permanent magnets for advanced stellarators. Recent researches show that permanent magnets have great potentials to simplify s…
Heat and particle flux detachment with stable plasma conditions in the Wendelstein 7-X stellarator fusion experiment
Marcin Jakubowski, Ralf König, Oliver Schmitz +30
Reduction of particle and heat fluxes to plasma facing components is critical to achieve stable conditions for both the plasma and the plasma material interface in magnetic confine…
Global scaling of the heat transport in fusion plasmas
Sara Moradi, Johan Anderson, Michele Romanelli +2
A global heat flux model based on a fractional derivative of plasma pressure is proposed for the heat transport in fusion plasmas. The degree of the fractional derivative of the he…
Large vacuum flux surfaces generated by tilted planar coils
Jessica L. Li, Jacob Austin, Ben Y. Israeli +2
Helical equilibria can be generated by arrangements of planar coils similar to tokamaks, but without a central solenoid and with the toroidal field (TF) coils tilted with respect t…
Overdense microwave plasma heating in the CNT stellarator
K. C. Hammond, R. R. Diaz-Pacheco, A. Koehn +2
Overdense plasmas have been attained with 2.45 GHz microwave heating in the low-field, low-aspect-ratio CNT stellarator. Densities higher than four times the ordinary (O) mode cuto…
High- equilibrium and ballooning stability of the low aspect ratio CNT stellarator
K. C. Hammond, S. A. Lazerson, F. A. Volpe
The existence and ballooning-stability of low aspect ratio stellarator equilibria is predicted for CNT with the aid of 3D numerical tools. In addition to having a low aspect ratio,…
Onion-peeling inversion of stellarator images
K. C. Hammond, R. Diaz-Pacheco, Y. Kornbluth +2
An onion-peeling technique is developed for inferring the emissivity profile of a stellarator plasma from a two-dimensional image acquired through a CCD or CMOS camera. Each pixel…
Experimental and numerical study of error fields in the CNT stellarator
K. C. Hammond, A. Anichowski, P. W. Brenner +4
Sources of error fields were indirectly inferred in a stellarator by reconciling computed and numerical flux surfaces. Sources considered so far include the displacements and tilts…
Metamaterial lens of specifiable frequency-dependent focus and adjustable aperture for electron cyclotron emission in the DIII-D tokamak
K. C. Hammond, W. J. Capecchi, S. D. Massidda +1
Electron Cyclotron Emission (ECE) of different frequencies originates at different locations in non-uniformly magnetized plasmas. For simultaneous observation of multiple ECE frequ…
Proto-CIRCUS Tilted-Coil Tokamak-Torsatron Hybrid: Design and Construction
A. W. Clark, M. Doumet, K. C. Hammond +4
We present the field-line modeling, design and construction of a prototype circular-coil tokamak-torsatron hybrid called Proto-CIRCUS. The device has a major radius R = 16 cm and m…
Simulation and Analysis of TE Wave Propagation as a Probe for Electron Clouds in Particle Accelerators
Kiran G. Sonnad, Kenneth Hammond, Robert Schwartz +1
The use of transverse electric (TE) waves has proved to be a powerful, noninvasive method for estimating the densities of electron clouds formed in particle accelerators. Results f…
Electron Cloud Density Measurements in Accelerator Beam-pipe Using Resonant Microwave Excitation
John P. Sikora, Benjamin T. Carlson, Danielle O. Duggins +3
An accelerator beam can generate low energy electrons in the beam-pipe, generally called electron cloud, that can produce instabilities in a positively charged beam. One method of…