Free electron laser with small period wiggler and sheet electron beam: A study of the feasibility of operation at 300 GHz with 1 MW CW output power
The use of a small period wiggler (/ell//sub ..omega../ < 1 cm) together with a sheet electron beam has been proposed as a low cost source of power for electron cyclotron resonance heating (ECRH) in magnetic fusion plasmas. Other potential applications include space-based radar systems. We have experimentally demonstrated stable propagation of a sheet beam (18 A. 1 mm /times/ 20 mm) through a ten-period wiggler electromagnet with peak field of 1.2 kG. Calculation of microwave wall heating and pressurized water cooling have also been carried out, and indicate the feasibility of operating a near-millimeter, sheet beam FEL with an output power of 1 MW CW (corresponding to power density into the walls of 2 kW/cm/sup 2/). Based on these encouraging results, a proof-of-principle experiment is being assembled, and is aimed at demonstrating FEL operating at 120 GHz with 300 kW output power in 1 ..mu..s pulses: electron energy would be 410 keV. Preliminary design of a 300 GHz 1 MW FEL with an untapered wiggler is also presented. 10 refs., 5 figs., 3 tabs.
- Research Organization:
- Maryland Univ., College Park (USA). Lab. for Plasma Research
- DOE Contract Number:
- FG05-87ER52147
- OSTI ID:
- 5916052
- Report Number(s):
- CONF-8808146-17; ON: DE89014759
- Resource Relation:
- Conference: 10. international free-electron laser conference, Jerusalem, Israel, 29 Aug 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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47 OTHER INSTRUMENTATION
FREE ELECTRON LASERS
DESIGN
BEAM CURRENTS
ECR HEATING
ELECTRON BEAMS
THERMAL ANALYSIS
WIGGLER MAGNETS
BEAMS
CURRENTS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
LASERS
LEPTON BEAMS
MAGNETS
PARTICLE BEAMS
PLASMA HEATING
420300* - Engineering- Lasers- (-1989)
440300 - Miscellaneous Instruments- (-1989)