Construction, testing of the 1 MW, 130-260 GHz Fusion-FEM

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:238775

Urbanus, W H; Bongers, G; Dijk, C A.J. van ^[1]

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1. FOM Instituut voor Plasmafysica Association, Nieuwegein (Netherlands); and others

During the previous 9 months the major part of the Fusion-FEM has been constructed. The 2 MV Insulated Core Transformer, the electron gun, the accelerator, the focusing lenses and the undulator have been tested on-site. In the present - temporary - set-up, the electron beam line consists of a 12 A, 80 keV thermionic electron gun, a 2 MeV dc accelerator, beam transport optics, the undulator and a collector. The gun is mounted in the high voltage terminal, which is now at -2 MV, and the undulator and mm-wave system am at ground potential outside the SF{sub 6}-filled pressure tank. This so-called inverse set-up allows easy access to the larger part of the beam line, the undulator and the mm-wave system, which is important in the conditioning phase. The decelerator and depressed collector am not yet installed. The design of the electron beam line has been optimised using the GPS particle-tracking code and the TOSCA code. The TOSCA code is used for accurate field calculations of the magnetic lenses. The results are used in the GPS code. The combination of these two codes allows optimization of the tens designs with respect to aberations, such as to avoid emittance growth. The mm-wave beam line has been designed, including a Boron-Nitride, Brewster angle, high power, broadband window. The window is designed for transmitting 1 MW of mm-wave power in the frequency range 130 - 260 GHz. Loss power is of the order of a percent. The first major goal is the transport of the electron beam through the undulator with only a small loss current. We report the final design of the electron beam line, the design of the mm-wave beam line, and the status of construction and testing of the Fusion-FEM.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• OSTI ID: 238775
• Report Number(s): BNL--61982-Absts.; CONF-9508156--Absts.; ON: DE96002729
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
43 PARTICLE ACCELERATORS
ACCELERATORS
DESIGN
ELECTRON GUNS
FREE ELECTRON LASERS
MASERS
TESTING
WIGGLER MAGNETS