GOL-PET experiments on THZ-emission from dense plasma at relativistic electron beam relaxation

Summary form only given. Electromagnetic emission from plasma in the vicinity of the fundamental plasma frequency and at its double value during a relativistic electron beam (REB) relaxation is studied at the GOL-3 facility [1]. In our paper we will present results of experiments carried out on the specialized GOL-PET device for the emission of terahertz radiation from plasma at its density ~ 10
¹⁵
cm
^-3
and the magnetic field strength 2-4 T. The plasma column created by a high-voltage discharge in the GOL-PET device has its diameter 6 cm and the length about of 250 cm. The injected electron beam has the following parameters: ~0.8 MeV, ~20 kA, ~10 μs. The beam current density in the plasma is up to 3kA/cm
²
. The radiation in the frequency interval from 0.1 up to 0.8 THz is analyzed by fast eight-channel polychromator and polarimeter based on frequency selection quasioptical elements.Results of the experimental measurements will be discussed in accordance to theoretical description with taking into account the influence of the magnetic field and high level turbulent in the plasma [2].