Projects per year
Abstract
We present initial predictions from the investigation of a novel, short-pulse (~200ns), space-charge-limited-emission electron accelerating diode, or electron-gun, that operates purely under the influence of its own self-fields – i.e. without the requirement for externally applied magnetic insulation of the propagating electron beam. The optimised model, developed using CST Studio Suite, predicted a ~500keV, ~1.86kA electron beam, with a mean envelope-radius of 16.8mm propagating into a 18mm radius drift-tube. The beam was very slightly convergent at the entry to the drift-region with a convergence angle of 1.50 (0.026rad).
A key consideration, in developing the electron gun, was the potential for vacuum-arcing, due to excessive electric field stresses. The pulsed nature of the gun aids in mitigating some of that risk, however to reduce it further, the maximum field-stress considered “safe” was taken to be ~40MV/m (double the typical Kilpatrick DC limit of 20MV/m). In the optimized model the peak stress was ~35MV/m, falling acceptably within the bounds set.
The electron gun is currently being manufactured for experimental testing, where it will then be used as the particle accelerator driving a novel, self-insulating, high-power microwave source.
A key consideration, in developing the electron gun, was the potential for vacuum-arcing, due to excessive electric field stresses. The pulsed nature of the gun aids in mitigating some of that risk, however to reduce it further, the maximum field-stress considered “safe” was taken to be ~40MV/m (double the typical Kilpatrick DC limit of 20MV/m). In the optimized model the peak stress was ~35MV/m, falling acceptably within the bounds set.
The electron gun is currently being manufactured for experimental testing, where it will then be used as the particle accelerator driving a novel, self-insulating, high-power microwave source.
Original language | English |
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Number of pages | 1 |
Publication status | Published - 6 Dec 2020 |
Event | 47th IEEE International Conference on Plasma Science - Virtual Duration: 6 Dec 2020 → 10 Dec 2020 https://www.icops2020.org/public.asp?page=home.html |
Conference
Conference | 47th IEEE International Conference on Plasma Science |
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Abbreviated title | ICOPS 2020 |
Period | 6/12/20 → 10/12/20 |
Internet address |
Keywords
- energetic electrons
- accelerating diodes
- particle acceleration
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Dive into the research topics of 'Dynamics of highly energetic electrons in novel accelerating diodes'. Together they form a unique fingerprint.Projects
- 2 Finished
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EPSRC Vacation Internship, Ben Crampsey
MacInnes, P., Crampsey, B. & Cooke, S.
1/06/20 → 7/08/20
Project: Research Studentship - Internally Allocated
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Compact high-power microwave oscillators (NICOP)
Phelps, A., Ronald, K. & MacInnes, P.
15/06/18 → 14/06/22
Project: Research