Title :
Characterizing the photon spectrum generated in the DARHT AXIS-I diode
Author :
Coleman, J.E. ; Moir, D.C. ; Ekdahl, C.A. ; Johnson, J.B. ; McCuistian, B.T. ; Crawford, M.T.
Author_Institution :
Los Alamos Nat. Lab., Los Alamos, NM, USA
Abstract :
Summary form only given. An array of photon diagnostics have been deployed on a high power relativistic electron beam diode. Surface flashover of a carbon fiber velvet cathode generates a discharge from which electrons are accelerated through a 17.8 cm diode. This discharge is assumed to be a hydrocarbon mixture. A small portion of the off energy electrons accelerated during the rise and fall of the 80 ns FWHM pulse impact the beam pipe and generate a flux of 0.1-4 MeV photons. The principal objective of these experiments is to quantify the dynamics of the hard X-ray and gamma-ray flux generated in the diode region, in addition to quantifying dynamics of the visible photons generated, and the ion species of the surface discharge on the velvet cathode. A qualitative comparison of different diagnostic results are presented, which include time resolved measurements with X-ray PIN diodes, a PMT, and CCD images. In addition initial visible spectroscopy measurements will also be presented.
Keywords :
electron beam applications; flashover; p-i-n diodes; CCD images; DARHT AXIS-I diode; FWHM pulse; PMT; X-ray PIN diodes; carbon fiber velvet cathode; electron volt energy 0.1 MeV to 4 MeV; energy electrons; gamma-ray flux; hard X-ray; hydrocarbon mixture; photon diagnostics array; photon spectrum; power relativistic electron beam diode; size 17.8 cm; surface flashover; time 80 ns; Acceleration; Arrays; Cathodes; Discharges (electric); Laboratories; Photonics; Surface discharges;
Conference_Titel :
Plasma Sciences (ICOPS) held with 2014 IEEE International Conference on High-Power Particle Beams (BEAMS), 2014 IEEE 41st International Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4799-2711-1
DOI :
10.1109/PLASMA.2014.7012463
