Generation and Application of MM and Sub-MM Radiation
Modern Studies on Generation and Application of MM and Sub-MM Radiation
Andrey Arzhannikov and Manfred Thumm
Laboratory of Prospective Research on Millimeter and Terahertz Radiation
Novosibirsk State University, 630090 Novosibirsk, RF
This paper describes results of modern experimental and theoretical studies on generation of mm and sub-mm waves and their various applications. Achievements in scientific research and engineering design in the frequency range from 0.1 up to 1 THz are reviewed.
Gyrotrons are the most suitable devices to generate high-power radiation in the frequency region 0.03 – 0.3 THz. Free electron lasers (FEL) are appropriate for the frequency range higher than 1 THz. Nevertheless, to generate very high power pulses in the frequency interval 0.1 -0.5 THz one can use a free electron maser (FEM) with a strongly elongated electron (E)-beam cross section and two-dimensional distributed feedback. To achieve high power radiation in the frequency interval 0.3-1THz, we proposed in 2010 to use the electromagnetic (EM) wave emission from a plasma column due to the process of strong interaction of a relativistic E-beam with the dense plasma.
Studies on mm-wave generation by the FEM with an elongated E-beam cross section and on the EM wave emission from dense plasmas due to plasma interaction were conducted in the Laboratory of Prospective Research on Millimeter and Terahertz Radiation at Novosibirsk State University (LPIMTR NSU) in collaboration with the Budker Institute of Nuclear Physics. Experimental research in this Laboratory at the GOL-3 and GOL-PET devices demonstrated a good prospect of the E-beam-plasma interaction method to generate sub-mm waves with tens MW power.
Millimeter and sub-mm waves have a very wide area of applications in science, industry and usual people life. The activity on investigation of applications of such waves includes the study on plasma heating, current drive and diagnostics in controlled thermonuclear fusion reactors and on the influence of EM-radiation on biological objects, physics methods in medical treatment, industrial production of nano-ceramics, searching of hidden objects by protection systems (e.g. in airports) and mm-wave beams for high resolution radars, wireless power transmission and so on. Such different application areas are also analysed in the paper.
The research work in LPIMTR NSU was conducted under the Government Decree #220: Contract number № 11.G34. 31.0033. Currently, the work is financially supported by RSCF Project #14-12-00610 (EM-wave emission by beam-plasma system) and by the Ministry of Education and Science of RF under the State Assignment Contract #3002 (development of the radiometric system).