Injection of an intense electron beam into a cyclic accelerator with solenoidal field focusing

This paper describes the injection and trapping of a high-current space-charge-dominated electron beam into a closed cyclic accelerator. A method has been developed to transport externally generated beams into a strong-focusing betatron using a pulsed E×B drift. The method requires modest electric f...

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Bibliographic Details
Published in:Journal of applied physics 1991-02, Vol.69 (4), p.1822-1834
Main Authors: Humphries, Stanley, Terry, R. L., Frauenglass, A.
Format: Article
Language:English
Subjects:
430302 - Particle Accelerators- Injection & Extraction Systems
ACCELERATORS
BEAM INJECTION
BEAMS
CYCLIC ACCELERATORS
ELECTRIC COILS
ELECTRIC FIELDS
ELECTRICAL EQUIPMENT
ELECTRON BEAMS
ELECTRON LOSS
LEPTON BEAMS
PARTICLE ACCELERATORS
PARTICLE BEAMS
SOLENOIDS
SPACE CHARGE
TRAPPING
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Summary:This paper describes the injection and trapping of a high-current space-charge-dominated electron beam into a closed cyclic accelerator. A method has been developed to transport externally generated beams into a strong-focusing betatron using a pulsed E×B drift. The method requires modest electric fields, gives good trapping efficiency, provides continuous focusing of high-perveance beams, has tolerance to imperfections, and has the potential ability to maintain the emittance of the injected beam. The accelerator was a racetrack machine with an 8-m circumference. Forty solenoid coils with alternating field polarity provided strong focusing. The 220-A, 500-keV injected beam entered the machine through a 2.5-cm-diam shielded transport tube. A pulsed electric field captured a 30-ns slice of the beam− the system trapped most of the current that had completed a full circuit. The main problem encountered in the experiments was a rapid loss of beam electrons during and after trapping. Electrons traveled an average of only two revolutions (16 m). Experimental observations and theoretical studies implied that magnetic dipole field errors in the injector were the primary cause of beam loss.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.348777