NDLI: Intense, high brightness H/sup -/ beams from surface plasma sources

Content Provider	IEEE Xplore Digital Library
Author	Guharay, S.K. Reiser, M.
Copyright Year	1997
Description	Author affiliation: Inst. for Plasma Res., Maryland Univ., College Park, MD, USA (Guharay, S.K.)
Abstract	High-current H/sup -/ beams from a reliable surface plasma source are of great interests for spallation neutron sources and hadron colliders. At Maryland, H/sup -/ beams have been studied using a magnetron and a Penning-type surface plasma source. Stable operating conditions with negligible beam noise have been achieved in both cases. The beam characteristics are much improved in the Penning geometry; the beam brightness is about an order of magnitude higher. An emission current density of /spl sim/1 A/cm/sup 2/ with normalized beam brightness of /spl gsim/10/sup 12/ A/(m-rad)/sup 2/ has been achieved. The minimum energy spread /spl Delta/E (FWHM) is measured /spl lsim/2.5 eV. The actual /spl Delta/E is possibly much smaller since this value is close to the resolution of the energy analyzer. The results are sensitive to the beam noise, and the gas pulse is the key control parameter here. Long, stable operations with very limited source maintenance have been noted. So far, an emission aperture of diameter=0.6 mm is used when the H/sup -/ beam current is /spl gsim/2 mA at 10 kV. The beam current can be scaled to /spl gsim/30 mA for an emission aperture of diameter /spl sim/2.4 mm. The critical issues for noiseless, high-brightness H/sup -/ beams, the source performance, and the scaling of beam parameters are discussed.
Starting Page	2681
Ending Page	2683
File Size	292524
Page Count	3
File Format	PDF
ISBN	078034376X
DOI	10.1109/PAC.1997.752730
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-05-16
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Brightness Particle beams Plasma sources Apertures Colliding beam devices Neutrons Geometry Current density Energy measurement Energy resolution
Content Type	Text
Resource Type	Article

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