The ETA-II Induction Linac as a High-Average-Power FEL Driver
| Autor: | Y.-J. Chen, D.P. Atkinson, Stephen Sampayan, A.L. Throop, M.A. Newton, W.E. Nexsen, H. C. Kirbie, A.C. Paul, J.C. Clark, W.C. Turner, L. V. Griffith, D.M. Barrett |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Pulse repetition frequency
Physics Nuclear and High Energy Physics Brightness Tokamak Electromagnet business.industry Wiggler Particle accelerator Linear particle accelerator law.invention Optics Nuclear magnetic resonance law business Instrumentation Microwave Pulse-width modulation Beam (structure) |
| Zdroj: | Proceedings of the Eleventh International Free Electron Laser Conference. |
| Popis: | The Experimental Test Accelerator II (ETA-II) is the first induction linac designed specifically to FEL requirements. It is primarily intended to demonstrate induction accelerator technology for high-average-power, high-brightness electron beams, and will be used to drive a 140 and 250 GHz microwave FEL for plasma heating experiments in the Microwave Tokamak Experiment (MTX) at LLNL. Its features include high-vacuum design which allows the use of an intrinsically bright dispenser cathode, induction cells designed to minimize BBU growth rate, and careful attention to magnetic alignment to minimize radial sweep due to beam corkscrew. The use of magnetic switches allows high-average-power operation. At present ETA-II is being used to drive 140 GHz plasma heating experiments. These experiments require nominal beam parameters of 6 MeV energy, 2 kA current, 20 ns pulse width and a brightness of 1x10/sup 8/ A/(m rad)/sup 2/ at the wiggler with a pulse repetition frequency (prf) of 0.5 Hz. Future 250 GHz experiments require beam parameters of 10 MeV energy, 3 kA current, 50 ns pulse width and a brightness of 1x10/sup 8/ A/(m rad)/sup 2/ with a 5 kHz prf for 0.5 s. In this paper we discuss the present status of ETA-II parameters and the phased development program necessary to satisfy these future requirements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|