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Graduate Student Seminar - 03/29/2013

"Study of Transverse Dynamics in Space Charge Dominated Beams"

by Hao Zhang

Friday, March 29, 2013 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Research Professor Rami Kishek

Every particle beam starts from a space charge dominated region. Space charge is a repulse force related with the electromagnetism self field in the particle beams. In most accelerators propagating low energy electron beams and most ion beams with high current and high intensity, space charge plays an important role in the beam dynamics. It is always associated with emittance growth, halo formation, and beam loss. These effects cause problems for many applications of high current and high itensity accelerators such as the free electron laser, Spallation Neutron Source, and medical cancer treatment. To maintain the beam with good quality (no emittance growth, no halo generated, and no beam loss), external forces should be balanced with self space charge and thermal pressure (which is described as emittance in beam physics). This balance (unbalance) of forces is called envelope match (mismatch). My experiments are performed using the University of Maryland Electron Ring, which produces a 10 keV, 100 ns electron beam with a wide range of current from 0.6-100 mA. My studies focus on matching the 6 mA beam transversely and how mismatch will affect the beam quality.

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