Experimental observations of wall plasma during a 1-microsecond long relativistic electron beam pulse

Eusebio P. Garate; Xiaoling Zhai

doi:10.1117/12.147448

8 July 1993 Experimental observations of wall plasma during a 1-microsecond long relativistic electron beam pulse

Eusebio P. Garate, Xiaoling Zhai

Proceedings Volume 1872, Intense Microwave Pulses; (1993) https://doi.org/10.1117/12.147448
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Experimental observation of wall plasma produced by a relativistic electron beam propagating through a 2.2 cm diameter stainless steel or copper plated stainless steel drift tube has been made at background pressures as low as 3 X 10^-6 Torr. An annular electron beam of thickness approximately 1 mm and outer diameter of approximately 1.8 cm was generated using a carbon fiber or graphite cathode and guided down the drift tube by a 15 kG magnetic field. The electron beam energy varied between 500 to 630 kV with total beam currents between 1 to 2 kA and pulse duration of approximately 750 ns. Two viewing ports and lens systems placed approximately 35 cm apart were used to collect light from plasma produced in the drift tube. The light was transmitted to two SPEX 1702/04 monochrometers using quartz optical fibers. Detection was done with photomultiplier tubes sensitive from 300 to 700 nm and lines from hydrogen, oxygen, iron and copper were observed. At the lowest background pressures no light emission was observed until approximately 1.5 microsecond(s) after the beam pulse for the unheated stainless steel drift tube. After baking and pumping the tube for two days light emission was observed approximately 1.8 microsecond(s) after the start of the beam pulse.

Citation Download Citation

Eusebio P. Garate and Xiaoling Zhai "Experimental observations of wall plasma during a 1-microsecond long relativistic electron beam pulse", Proc. SPIE 1872, Intense Microwave Pulses, (8 July 1993); https://doi.org/10.1117/12.147448

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