Free electron lasers with small period wigglers: Progress report, September 15, 1988--September 14, 1989
Progress of research on a short period wiggler (SPW) free electron laser (FEL) with a sheet electron beam is reviewed. Most of the recent work has concentrated on addressing thermal engineering issued in the device. This particular emphasis was particularly stimulated by an evaluation by Panel XXI for the Magnetic Fusion Advisory Committee which stated: ''There are serious thermal management engineering uncertainties in the electron gun, the microwave cavity, and the wiggler that will need to be addressed for CW operation. In the panel's judgment, these thermal problems are likely to be insurmountable for fusion applications... .'' In fact, recent experimental and theoretical results challenge this judgment. For example, our most recent conceptual designs involve small-to-negligible rf losses in the cavity walls. In addition, we have convincingly established that for electron beams of quality achievable with thermionic Pierce guns, body currents should be negligible to nonexistent, thus ensuring a thermally stable cavity. These discoveries, as well as other research progress, are reviewed in detail in the following report. Plans are described for a pulsed (100 ns) proof-of-principle ''lasing'' experiment to be conducted during the remainder of this fiscal year. In addition, we present a revised statement of work and budget for the follow-on year of the current grant. These proposed tasks will address the remaining risk issues for an ERCH source based on the SPW sheet-beam FEL. Upon the completion of those tasks, sufficient information will exist to confidently assess the feasibility of the proposed concept. 43 refs., 21 figs., 2 tabs.
- Research Organization:
- Univ. of Maryland, College Park, MD (United States)
- DOE Contract Number:
- FG05-87ER52147
- OSTI ID:
- 6106243
- Report Number(s):
- DOE/ER/52147-2; ON: DE89014715
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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FREE ELECTRON LASERS
DESIGN
BEAM CURRENTS
BEAM TRANSPORT
BETATRON OSCILLATIONS
CAVITY RESONATORS
ELECTRON GUNS
POWER SUPPLIES
PROGRESS REPORT
WIGGLER MAGNETS
BEAM DYNAMICS
CURRENTS
DOCUMENT TYPES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ELECTRONIC EQUIPMENT
EQUIPMENT
LASERS
MAGNETS
OSCILLATIONS
RESONATORS
420300* - Engineering- Lasers- (-1989)