Axis-encircling electron beam generation using a smooth magnetic cusp for gyrodevices

He, W.; Whyte, C. G.; Rafferty, E. G.; Cross, A. W.; Phelps, A. D. R.; Ronald, K.; Young, A. R.; Robertson, C. W.; Speirs, D. C.; Rowlands, D. H.
September 2008
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p121501
Academic Journal
The generation of an annular-shaped axis-encircling electron beam using a smooth magnetic cusp was studied through numerical simulations and experiments for harmonic operation of a gyrodevice. Two magnetic coils were used to form a magnetic cusp located just downstream from the velvet cathode of an accelerator diode. An electron beam of current 34 A and voltage 130 kV with an adjustable velocity ratio α up to 1.2 was fully transported to the downstream uniform magnetic field region and used to drive a gyrotron traveling wave amplifier into saturation.


Related Articles

  • Reflections in gyrotrons with radial output: Consequences for the ITER coaxial gyrotron. Dumbrajs, O.; Nusinovich, G. S.; Piosczyk, B. // Physics of Plasmas;Dec2004, Vol. 11 Issue 12, p5423 

    A theory describing the influence of reflections on operation of gyrotrons with radial output is presented. The theory is used for evaluating the effect of reflections on the operation of the 170 GHz ITER coaxial cavity gyrotron, which is under development in cooperation between EUROATOM...

  • Production of net positive space charge in a rarefied neutral gas for strong focusing of electron beams. Kuperman, V. Yu.; Friedman, G. // Journal of Applied Physics;11/1/1992, Vol. 72 Issue 9, p3867 

    Presents a study that examined a stationary process of secondary particle production due to impact ionization of neutral gas by an electron beam and their escape in the presence of an axial focusing magnetic field. Dynamic processes leading to the over-compensation of the beam; Steady state of...

  • Experimental study of the depth dose distributions produced by an electron beam. Belousov, A. V.; Kurakin, A. A.; Chernyaev, A. P. // Instruments & Experimental Techniques;Jul2006, Vol. 49 Issue 4, p559 

    Changes in the amplitude and position of the maximum of the depth dose distribution produced by the electron beams with energies of 25 and 50 MeV in the presence of a transverse magnetic field with an induction of 05-1.2 T are confirmed experimentally. A model for the analytical calculation of...

  • Perspectives of LEPTA. Kobets, A. G.; Korotaev, Yu. V.; Meshkov, I. N.; Pivin, R. V.; Seleznev, I. A.; Sidorin, A. O.; Smirnov, A. V.; Trubnikov, G. V.; Yakovenko, S. L. // AIP Conference Proceedings;2005, Vol. 796 Issue 1, p399 

    The Low Particle Toroidal Accumulator (LEPTA) project is under development at JINR. The ring assembling is completed. The test experiments with circulating electron beam are in progress and the results are presented. Assembling and test of the positron injector is started. The program of...

  • Demonstration of Steady State Operation with 1 MW of 170 GHz gyrotron for ITER. Kasugai, Atsushi; Takahashi, Koji; Kajiwara, Ken; Kobayashi, Noriyuki; Sakamoto, Keishi // AIP Conference Proceedings;9/15/2007, Vol. 933 Issue 1, p405 

    A quasi-steady-state operation of 1 MW/800 s with the efficiency of 55%, which exceeded 1 MW/500 s/50% of the performance required in ITER, was demonstrated in a 170 GHz gyrotron. The oscillation characteristics in the long pulse operation was clarified, and the operation scenario to the hard...

  • Nonlinear saturation of collisionless trapped electron mode turbulence: Zonal flows and zonal density. Jianying Lang; Parker, Scott E.; Yang Chen // Physics of Plasmas;May2008, Vol. 15 Issue 5, p055907 

    Gyrokinetic δf particle simulation is used to investigate the nonlinear saturation mechanisms in collisionless trapped electron mode (CTEM) turbulence. It is found that the importance of zonal flow is parameter-sensitive and is well characterized by the shearing rate formula. The effect of...

  • Stabilization of the potential multi-steady-state absolute instabilities in a gyrotron traveling-wave amplifier. Chao-Hai Du; Pu-Kun Liu // Physics of Plasmas;Oct2009, Vol. 16 Issue 10, p103107 

    The problem of spurious oscillations induced by absolute instabilities is the most challenging one that hinders the development of the millimeter-wave gyrotron traveling-wave amplifiers (gyro-TWTs). A spurious oscillation exists as a high order axial mode (HOAM) in the interaction circuit. This...

  • Nonparaxial magnetron injection gun for a high-power pulsed submillimeter-wave gyrotron. Glyavin, M. Yu.; Luchinin, A. G.; Manuilov, V. N. // Radiophysics & Quantum Electronics;Feb2009, Vol. 52 Issue 2, p150 

    We determine distinctive features of the systems forming helical electron beams (HEBs) for high-power pulsed gyrotrons operated in the submillimeter-wave range. It is shown that they are characterized by a nonparaxial magnetic field in the emitter region, short distances between the cathode and...

  • Magnetic-field source for bichambered electron-beam devices. Leupold, H. A.; Potenziani II, E.; Basarab, D. J.; Tilak, A. // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p4650 

    Presents a study that described a gyrotron magnet designed to produce an axial magnetic field in tandem cylindrical chambers of different diameter. Discussion of the sophistication of high-energy electron beam radiation sources; Information on the permanent magnet solenoids.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics