Runaway electron studies in the ATF torsatron
| Autor: | A.C. England, G.H. Neilson, M. Murakami, G. L. Bell, John B Wilgen, J. H. Harris, James A. Rome, J.C. Glowienka, M.J. Saltmarsh, R.H. Fowler, Dongkyu Lee, David A Rasmussen |
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| Rok vydání: | 1991 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Toroid Field (physics) Astrophysics::High Energy Astrophysical Phenomena Computational Mechanics General Physics and Astronomy Plasma Electron Condensed Matter Physics Electromagnetic radiation Magnetic flux law.invention Mechanics of Materials law Physics::Accelerator Physics Plasma diagnostics Astrophysics::Earth and Planetary Astrophysics Atomic physics Stellarator |
| Zdroj: | Physics of Fluids B: Plasma Physics. 3:1671-1686 |
| ISSN: | 0899-8221 |
| Popis: | Runaway electron formation and confinement occur readily in pulsed torsatrons and heliotrons because of the high loop voltages during initiation and termination of the helical and vertical fields (‘‘field ramping’’) and the inherently good containment of the electrons on the flux surfaces in the vacuum fields. This has been confirmed for the Advanced Toroidal Facility (AFT) [Fusion Technol. 10, 179 (1986)] and other stellarators by orbit calculations. Since runaway electrons can cause an unacceptable level of hard x rays near the machine, a runaway electron suppression system was incorporated in ATF. The main component of the system is a movable paddle, which is normally left in the center of the plasma chamber during the field ramps. This device, in conjunction with programmed vertical field ramping, which reduces the volume of good flux surfaces, has proved to be very effective in reducing the runaway electron population. Measurements of hard x rays from ATF have shown that the runaway electrons are pro... |
| Databáze: | OpenAIRE |
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