Conference Paper

Magnetic field measurements of printed-circuit quadrupoles and dipoles

Maryland Univ., College Park, MD
DOI: 10.1109/PAC.1999.792307 Conference: Particle Accelerator Conference, 1999. Proceedings of the 1999, Volume: 5
Source: IEEE Xplore


Printed-Circuit (PC) quadrupoles and dipoles have been designed
and developed for focusing and bending a space-charge dominated electron
beam in the University of Maryland Electron Ring (UMER), currently under
development. Due to the rather small aspect ratio (length/diameter
<1) of the magnets, the field quality, especially the nonlinear
fringe field, has been a concern for the success of the UMER project.
Extensive theoretical and experimental studies of the field structure of
the magnets have been performed. Simple and precise methods for the
magnetic field measurements of the PC magnets have been developed. In
this paper, we present the various techniques and results of the
measurements. The magnetic multipole components of quadrupoles and
dipoles are determined from measurements with a long rotating coil. In
addition, the integrated field of quadrupoles is obtained with the
pulsed, taut-wire method. A comparison between the experimental results,
theoretical analysis and calculation with a magnetics code, MAG-PC, is


Available from: Rami Kishek, Feb 18, 2014
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    ABSTRACT: The electron beam injector constructed by FM technologies for the University of Maryland Electron Ring (UMER) program is described. The program will use an electron beam to model space-charge-dominated ion beams in a recirculating linac for heavy ion inertial fusion, as well as for high-current muon colliders. The injector consists of a 10keV, 100mA electron gun with 50–100nsec pulse width and a repetition rate of 120Hz. The e-gun system includes a 6-mask, rotatable aperture plate, a Rogowski current monitor, an ion pump, and a gate valve. The injector beamline consists of a solenoid, a five-quadrupole matching section, two diagnostic chambers, and a fast current monitor. An independent diagnostic chamber also built for UMER will be used to measure horizontal and vertical emittance, current, energy, energy spread, and the evolution of the beam envelope and profile along the injector beamline.
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