DocumentCode :
3219853
Title :
A high density hydrogen-based capillary plasma source and its potential applications for the plasma wakefield accelerators
Author :
Chen, H. ; Kallos, E. ; Muggli, P. ; Katsouleas, T.C. ; Gundersen, M.A.
Author_Institution :
Electr. Eng.-Electrophys., Univ. of Southern California, Los Angeles, CA, USA
fYear :
2009
fDate :
1-5 June 2009
Firstpage :
1
Lastpage :
1
Abstract :
Summary form only given. Capillary plasmas are typically generated in insulated tubes with the internal diameter ranging from tens of micrometers to several millimeters. It is convenient to produce a pulsed discharge either by ionizing a gas that fills the capillary or by ablation of the capillary wall and electrodes. We report the generation of variable plasma densities up to 1019 cm-3 in hydrogen-filled capillary discharges, and consider their applications as a practical plasma source for particle-beam- driven plasma wakefield accelerators. The capillary consists of a transparent, cylindrical borosilicate glass tube with inner diameter less than 1 mm. Stark broadening of the H?? line and the ratio of the light emitted under two Balmer lines are used to characterize the plasma density and plasma temperature respectively. The time resolved plasma density is found to decay exponentially with a typical time constant of several hundreds of nanoseconds. The time delay between the discharge and the drive electron beam can therefore be tuned to reach the density appropriate for the maximum acceleration gradient. The dependence of the plasma density on the capillary geometry and gas pressure and implications of the results for beam-driven plasma accelerators are discussed.
Keywords :
Stark effect; discharges (electric); plasma accelerators; plasma density; plasma sources; plasma temperature; spectral line broadening; time resolved spectra; Balmer lines; Stark broadening; cylindrical borosilicate glass tube; electron beam; gas pressure; high-density hydrogen-based capillary plasma source; hydrogen-filled capillary discharges; particle-beam-driven plasma wakefield accelerators; plasma density; plasma temperature; plasma wakefield accelerator applications; pulsed discharge; time-resolved spectra; Acceleration; Electrodes; Fault location; Insulation; Ion accelerators; Particle accelerators; Plasma accelerators; Plasma applications; Plasma density; Plasma sources;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science - Abstracts, 2009. ICOPS 2009. IEEE International Conference on
Conference_Location :
San Diego, CA
ISSN :
0730-9244
Print_ISBN :
978-1-4244-2617-1
Type :
conf
DOI :
10.1109/PLASMA.2009.5227705
Filename :
5227705
Link To Document :
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