Temkin named IEEE Plasma Science and Applications Award winner

http://mit.edu/newsoffice/2013/temkin-named-ieee-plasma-science-and-applications-award-recipient.html
Dr. Richard J. Temkin, a senior scientist in the Department of Physics and associate director of the Plasma Science and Fusion Center (PSFC), has been named as the recipient of the 2013 IEEE Plasma Science and Application Award. Temkin, who heads the Waves and Beams Division at the PSFC, was cited "for fundamental contributions to the field of high power gyrotrons and their application."

The IEEE Plasma Science and Applications Award is given annually “to recognize outstanding contributions to the field of Plasma Science in research or new applications.” The prize consists of a plaque, $3,000 cash award and an invitation to present a talk in the award year's International Conference on Plasma Science. The text of that talk will be published as an invited paper in the journal IEEE Transactions on Plasma Science.

Temkin is a pioneer in research and development of high-power and high-frequency gyrotrons. Gyrotrons are a form of electron cyclotron maser in which powerful beams of electrons propagating in vacuum in a high magnetic field radiate coherently at their cyclotron frequency. Very high-frequency output is achieved by using high-field superconducting magnets.

Gyrotrons are the most powerful source of radiation in the millimeter and terahertz frequency range, a range of frequencies that lies between the microwave region and the optical region. Gyrotrons are used for heating plasmas in the program of research on nuclear fusion energy; enhanced nuclear magnetic resonance (NMR) spectroscopy of biomolecules; studies of gas and air breakdown by intense millimeter wave radiation; materials heating and processing; nuclear material detection; cancer detection and cancer therapy; terahertz imaging; high power radars for weather and defense; and food processing and purification.

Temkin will be presented with the award at this year’s IEEE Pulsed Power & Plasma Science Conference, to be held in San Francisco from June 16-21.

Vacuum Electronics Serve As Terahertz Power Source

http://www.mwrf.com/Article/ArticleID/23810/23810.html
Capabilities have greatly advanced for vacuum-electronic-device (VED) sources of terahertz and near-terahertz coherent radiation—both continuous wave (CW) and pulsed sources. Quantum-theory models of some terahertz VEDs have been developed and used with some success. Yet all terahertz VEDs can be explained with purely classical models, which is the approach taken by the following group of researchers: John H. Booske from the University of Wisconsin; Richard J. Dobbs from CPI Canada; Colin D. Joye from the US Naval Research Laboratory; Carol L. Kory from Teraphysics, Inc.; George R. Neil with the Thomas Jefferson National Accelerator Facility; Gun-Sik Park with Seoul National University; Jaehun Park from Korea’s Pohang University of Science and Technology; and Richard J. Temkin from the Massachusetts Institute of Technology.
For high-power devices needing to generate high-power electron currents in particular, the vacuum is an ideal propagation medium. VEDs do have tradeoffs, though. These include the need for a three-dimensional (3D), vacuum-tight enclosure.
The researchers note that terahertz devices based on VED technology cover a total bandwidth exceeding 10.0 THz. Terahertz-device choices can be roughly broken down into three classes. Compact sources with high mobility include backwards-wave oscillators (BWOs). They range from 0.1 to 1.0 THz with 10T-3 through 103 W (CW and pulsed) output power. Another option is compact gyrotons with moderate mobility, which cover 0.1 to 1.0 THz with 10-3 through 106 W (CW and pulsed) output power. Stationary accelerator-based sources, including free electron lasers (FELs), range from 0.2 to 10.0 THz and beyond with 10 through 109 W (average and pulsed) output power. See “Vacuum Electronic High Power Terahertz Sources,” IEEE Transactions On Terahertz Science And Technology, Sept. 2011, p. 54.