The Electron Gun for the Stanford Two-Mile Accelerator

Miller, R.H.; Berk, Josh; McKinney, T.

doi:10.1109/tns.1967.4324531

Cited by 9 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…dependence of the cheraionic emission current density leads directly to the concept of perveance here defined as the constant K in the expression K V 3/2 « lo" 6(15) Since K depends only on geometric factors, the perveancc becooes an identifying characteristic of the device. Because of common usage, per veance for the program is exptessed with the Implied factor of 10 , 3/2 i.e., wicropcrveance having un_ts microamperes per voltTha central problem for the GENERAL cathode starting routine is to define the starting surface and to calculate the distance x for the thickness of the pill box.…”

mentioning

confidence: 99%

Electron Trajectory Program

Herrmannsfeldt

1973

View full text Add to dashboard Cite

The SLAC Electron Trajectory Prograci is described and Instructions and examples for users are given. The program is specifically written to compute trajectories of charged particles in electrostatic and magnetoutatic focusing systems including the effects of space charge and self-magnetic fields. Starting options include Child's Law conditions on cathodes of various shapesr Either rectangular or cylindrically Bymaetric geometry Day be used. Magnetic fields njy be specified using arbitrary configurations of coils, $r the output of a magnet program such as Polsson or by an externally calculated array of the axial fields. The program is available in IBM FORTRAN but can be easily converted for use on other brands

show abstract

mentioning

confidence: 99%

Electron Trajectory Program

Herrmannsfeldt

1973

View full text Add to dashboard Cite

show abstract

Microwave studies of a tunable free-electron laser in combined axial and wiggler magnetic fields

Fajans

Bekefi

Yin

et al. 1985

The Physics of Fluids

View full text Add to dashboard Cite

We report narrow band (Aw/w < 0.02) microwave emission from a tunable (7 < w/27r < 21GHz) Raman, free electron laser operating in a single TE 11 waveguide mode. Approximately 100kw of RF power has been observed at an electronic efficiency of 12%, and -1MW of RF power has been generated at a reduced efficiency of 8%. Frequency, gain and RF power measurements have been carried out for various values of the guide magnetic field, below, above and near to the resonance between the cyclotron frequency of the guide magnetic field and the frequency associated with the periodic wiggler magnetic field. The results are in very good agreement with the predictions of three-dimensional free electron laser theory.'Permanent address: Institute of Electronics, Academia Sinica, Beijing, People's Republic of China. I-IntroductionThe Raman (collective) free electron laser (FEL) produces coherent radiation by subjecting a cold, intense electron beam to a periodic "wiggler" magnetic field. The wiggler magnet causes the electron beam to oscillate transversely, and this periodic oscillation couples via the ponderomotive force 1 -3 to a longitudinal beam space charge (plasma) oscillation. The net induced oscillating current drives the coherent output radiation, with the energy for the radiation coming at the expense of the beam kinetic energy. The outstanding properties of the FEL include its inherent tunability, high radiation levels and moderately good efficiencies.Theory predicts radiation at two frequencies approximately given by w = fluck,1(1 t # 1 ), where -yII = (1 _ '3)-1/2 is the relativistic axial energy factor, Ai = vii/c is the normalized axial velocity of the electron beam, and k, = 27r/1, where I is the wiggler period. Consequently the FEL can be tuned by changing the accelerator voltage. Promise of wide tunability merely by changing the accelerator voltage gives the FEL one of its most distinguishing characteristics.A focusing guide magnetic field B 1 j is utilized to contain the unneutralized beam. This additional field results in an interesting "resonant" regime much explored by theorists 4 -7 which occurs in a parameter regime 011/:: k,'3 1 jc, where f2i = eB 1 /mo is the non-relativistic cyclotron frequency in the axial guide magnetic field and -y is the total relativistic energy factor y =1+ eV/moc 2 2 (1 --P1)-1/ with V as the accelerator voltage. Use of an electron gun with a thermionic cathode permits long pulse operation of the FEL and yields a low temperature beam (&yll/y 3 X 103).In this paper we describe a detailed experimental study of a free electron laser operating at mildly relativistic energies V ~ 175kv, -y ~ 1.35, sometimes referred to as the Ubitron regime. 8 We demonstrate continuous, narrow-band, single mode tuning from 7 to 21 GHz, and we believe that this is the first detailed study of the frequency versus voltage tuning of both the high and the low frequency branches of the FEL instability mentioned above under high current density, collective (Raman) operation.Our FEL is used both as a...

show abstract

Analysis of non-laminar electron beams for high-power microwave tubes

Hechtel¹

1974

1974 International Electron Devices Meeting (IEDM)

View full text Add to dashboard Cite

The Electron Gun for the Stanford Two-Mile Accelerator

Cited by 9 publications

References 2 publications

Electron Trajectory Program

Electron Trajectory Program

Microwave studies of a tunable free-electron laser in combined axial and wiggler magnetic fields

Analysis of non-laminar electron beams for high-power microwave tubes

Contact Info

Product

Resources

About