Deflection of carbon dioxide laser and helium-neon laser beams in a long-pulse relativistic electron beam diode

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Review of Scientific Instruments; (USA)

DOI:https://doi.org/10.1063/1.1142421· OSTI ID:5804944

Bosch, R A; Ching, H; Gilgenbach, R M; Ventzek, P L.G.; Menge, P R; Choi, J J; Spencer, T A ^[1]

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1. Intense Energy Beam Interaction Laboratory, Nuclear Engineering Department, The University of Michigan, Ann Arbor, Michigan 48109-2104 (US)

Deflection of carbon dioxide and helium-neon laser beams has been used to measure plasma and neutral density gradients during the operating mode and after the shorting time of a long-pulse field-emission electron beam diode. Plasma density gradients of (10{sup 14}--10{sup 15}) cm{sup {minus}4} were observed throughout the diode during the final microsecond of the 2--3 {mu}s electron beam pulse. The neutral density gradient was less than 1{times}10{sup 18} cm{sup {minus}4} during the electron beam pulse. Upon diode shorting, neutral density gradients increased to (10{sup 18}--10{sup 19}) cm{sup {minus}4} over {similar to}1 {mu}s, and decayed over many microseconds. Plasma density gradients of {similar to}10{sup 15} cm{sup {minus}4} were also observed after shorting. These experiments demonstrate the value of carbon-dioxide laser and helium-neon laser deflection for diagnosing plasma and neutral particles in long-pulse electron beam diodes.

• OSTI ID: 5804944
• Journal Information: Review of Scientific Instruments; (USA), Journal Name: Review of Scientific Instruments; (USA) Vol. 62:7; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102 -- Fusion Energy-- Plasma Research-- Diagnostics
BEAMS
CARBON DIOXIDE LASERS
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
EMISSION
ENERGY RANGE
FIELD EMISSION
GAS LASERS
HELIUM-NEON LASERS
LASER RADIATION
LASERS
LEPTON BEAMS
MEV RANGE
PARTICLE BEAMS
PLASMA DIAGNOSTICS
RADIATIONS