Compensation For Bunch Emittance In A Magnetization And Space Charge Dominated Beam

Journal Article · Tue Dec 07 04:00:00 EST 2004 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1842578· OSTI ID:20655239

Xiangyun, Chang; Ben-Zvi, Ilan; Kewisch, Joerg ^[1]

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1. Collider-Accelerator Department, Brookhaven National Laboratory, Upton NY 11973 (United States)

In order to obtain sufficient cooling rates for the Relativistic Heavy Ion Collider (RHIC) electron cooling, a bunched beam with high bunch charge, high repetition frequency and high energy is required and it is necessary to use a 'magnetized' beam, i.e., an electron beam with non-negligible angular momentum. Applying a longitudinal solenoid field on the cathode can generate such a beam, which rotates around its longitudinal axis in a field-free region. This paper suggests how a magnetized beam can be accelerated and transported from a RF photocathode electron gun to the cooling section without significantly increasing its emittance. The evolution of longitudinal slices of the beam under a combination of space charge and magnetization is investigated, using paraxial envelope equations and numerical simulations. We find that we must modify the traditional method of compensating for emittance as used for normal non-magnetized beam with space charge to account for magnetization. The results of computer simulations of successful compensation are presented. Alternately, we show an electron bunch density distribution for which all slices propagate uniformly and which does not require emittance compensation.

• OSTI ID: 20655239
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 737; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATION
ANGULAR MOMENTUM
BEAM BUNCHING
BRIGHTNESS
BROOKHAVEN RHIC
COLLIDING BEAMS
COMPUTERIZED SIMULATION
ELECTRON BEAMS
ELECTRON COOLING
ELECTRON GUNS
EQUATIONS
EVOLUTION
MAGNETIZATION
PHOTOCATHODES
SOLENOIDS
SPACE CHARGE