UMER: The University Maryland Electron ring

O’Shea, P.G.; Reiser, M.; Kishek, R. A.; Bernal, S.; Li, H.; Pruessner, Marcel W.; Virgo, M.; Yun, V.; Zhang, W.; Godlove, Terry F.; Kehne, D.; Haldemann, P.; Haber, I.

doi:10.1063/1.1384371

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…This "DC" injector will function adequately for the first turn and will permit us to understand and refine the design of the pulsed injector and extractor sections. The latter, as illustrated in the general paper on UMER [2], is a replica of the * Work supported by the U.S. Department of Energy.…”

Section: Beam Line and Diagnosticsmentioning

confidence: 99%

Beam tests of the 10 keV injector for the University of Maryland electron ring (UMER)

Bernal

Li²,

Virgo³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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Results are presented of the first experiments with a 10 keV, 100 mA beam in the matching section for UMER. The section, about 1.5 m long, consists of one short solenoid, six printed-circuit (PC) quadrupoles, a bend PC dipole, a number of steering dipoles, and two sets of Helmholtz coils for balancing the Earth's field. The 2 RMS beam radius as a function of axial distance in the straight part of the beam line is obtained from fluorescent screen pictures. The results are compared with calculations using the K-V envelope equations. The importance of an accurate determination of the initial conditions, i.e. beam envelope size and slope at the entrance plane, as well as the emittance, is emphasized. Furthermore, the role of different types of errors, specially misalignment and quadrupole rotations is discussed.

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Section: Beam Line and Diagnosticsmentioning

confidence: 99%

Beam tests of the 10 keV injector for the University of Maryland electron ring (UMER)

Bernal

Li²,

Virgo³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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“…UMER is a model of future generations of accelerators that will require space-charged dominated beams [2]. Figure 1 shows the ring, which is roughly 3 m in diameter and operates at 10 keV.…”

Section: Introductionmentioning

confidence: 99%

Controls and alignment for the University of Maryland Electron Ring

Virgo¹,

Kishek²,

Bernal³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The University of Maryland Electron Ring (UMER) [1] is a compact experiment that will be used to study the fundamental properties of space-charge dominated beams. Because of the small physical dimensions and weak fields involved, maintaining the beam's orbit is a difficult challenge. Accurate characterization of the magnets, careful alignment, and an effective control system are all critical to the project's success. In this report, the key challenges are outlined and the procedures that will be implemented to address them are explained. Existing portions of the system are described, and future plans are evaluated with computer simulation.

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“…Air-core printed-circuit (PC) quadrupoles have been developed for the University of Maryland Electron Ring [1,2], to focus a 10 keV, 100 mA electron beam over a circumference of 11.5 m. The printed-circuit currents generate a quadrupole field with small gradient and high quality [3]. However, rotation errors about the magnet axis, resulting from assembly and mounting, can be detrimental to the beam quality.…”

Section: Introductionmentioning

confidence: 99%

Printed-circuit magnets for the University of Maryland Electron Ring (UMER) - new developments

Bernal

Kishek

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The short printed-circuit quadrupoles for UMER [see invited paper by P.G. O'Shea] produce fields with small gradients that meet our needs for the focusing and bending of a 10 keV, 100 mA electron beam over a circumference of 11.5 m. The field quality of the magnets has been established [see W.W. Zhang et al., Phys. Rev. ST Accel. Beams 3, 122401 (2000)], but correcting elements are needed to compensate for quadrupole rotation errors that lead to undesirable beam rotations in the injector line as well as in the main lattice. The correcting elements consist of printed-circuit quadrupoles that are mounted over the main quadrupoles, with a relative angle of 45 degrees. In this way, a skew quadrupole component can be easily, independently and electronically adjusted to rotate the quadrupole field. Results are presented of field measurements of the modified quadrupoles, as well as preliminary observations in the UMER injector, and corresponding computer simulations.

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UMER: The University Maryland Electron ring

Cited by 6 publications

References 3 publications

Beam tests of the 10 keV injector for the University of Maryland electron ring (UMER)

Beam tests of the 10 keV injector for the University of Maryland electron ring (UMER)

Controls and alignment for the University of Maryland Electron Ring

Printed-circuit magnets for the University of Maryland Electron Ring (UMER) - new developments

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