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Featured researches published by B. Beaudoin.


Physics of Plasmas | 2011

Longitudinal confinement and matching of an intense electron beam

B. Beaudoin; I. Haber; R. A. Kishek; S. Bernal; T. Koeth; D. Sutter; P. G. O’Shea; M. Reiser

An induction cell has successfully been demonstrated to longitudinally confine a space-charge dominated bunch for over a thousand turns (>11.52 km) in the University of Maryland Electron Ring [Haber et al., Nucl. Instrum. Methods Phys. Res. A 606, 64 (2009) and R. A. Kishek et al., Int. J. Mod. Phys. A 22, 3838 (2007)]. With the use of synchronized periodic focusing fields, the beam is confined for multiple turns overcoming the longitudinal space-charge forces. Experimental results show that an optimum longitudinal match is obtained when the focusing frequency for containment of the 0.52 mA beam is applied at every fifth turn. Containment of the beam bunch is achievable at lower focusing frequencies, at the cost of a reduction in the transported charge from the lack of sufficient focusing. Containment is also obtainable, if the confinement fields overfocus the bunch, exciting multiple waves at the bunch ends, which propagate into the central region of the beam, distorting the overall constant current beam...


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

The University of Maryland Electron Ring (UMER)

P.G. O'Shea; B. Beaudoin; S. Bernal; Y. Cui; D. Feldman; M. Glanzer; T.F. Godlove; J. Harris; M. Holland; H. Li; R. A. Kishek; B. Quinn; N. Rahimi; M. Reiser; A. Valfells; M. Virgo; M. Walter; R. Yun; V. Yun; D. Kehne

A detailed understanding of the physics of space-charge dominated beams is vital for many advanced accelerators that desire to achieve high beam intensity. In that regard, low-energy, high-intensity electron beams provide an excellent model system. The University of Maryland Electron ring (UMER), currently under construction, has been designed to study the physics of space-charge dominated beams with extreme intensity in a strong focusing lattice with dispersion. The tune shift in UMER will be more than an order of magnitude greater than exiting synchrotrons and rings. The 10-keV, 100 mA, UMER beam has a generalized perveance in the range of 0.0015, and a tune shift of 0.9. Though compact (11-m in circumference), UMER is a very complex device, with over 140 focusing and bending magnets. We report on the unique design features of this research facility, the beam physics to be investigated, and early experimental results.


bipolar/bicmos circuits and technology meeting | 2003

Design and testing of a fast beam position monitor

B. Quinn; B. Beaudoin; S. Bernal; A. Diep; J. Harris; M. Holloway; D. Lamb; W. Lee; M. Glanzer; M. Quirus; M. Reiser; M. Walter; A. Valfells; R. Yun; P.G. O'Shea

The University of Maryland Electron Ring (UMER) group is currently exploring the physics of space-charge dominated beams. Seventeen Beam Position Monitors (BPMs) will be used to determine the beam centroid for steering correction purposes to within 0.5 mm. Since the pulse length is relatively long (100 ns), the BPMs can also be used for temporal beam profiling. These features are extremely useful for perturbation and longitudinal dynamics studies. For these uses the BPM needs a temporal resolution better than 2 ns. We report on the final design and testing as well as other unique features of this device.


ieee particle accelerator conference | 2007

OTR measurements of the 10 keV electron beam at the University of Maryland Electron Ring (UMER)

R. Fiorito; Donald W. Feldman; Anatoly Shkvarunets; S. Casey; B. Beaudoin; B. Quinn; P.G. O'Shea

We present strong evidence of the observation of optical transition radiation (OTR) from aluminized silicon targets intercepting the UMER 10 keV, 100 ns pulsed electron beam, using fast (300 ps and Ins rise time) photomultiplier tubes. An intensified gated (3 ns-lms) intensified CCD camera is used to image the beam using OTR and to study its time evolution throughout the beam pulse. A comparison of wave forms and time resolved OTR images is presented along with time integrated images obtained with phosphor screens for different initial conditions, i.e. beam currents and gun bias voltages.


ieee particle accelerator conference | 2007

Evolution of laser induced perturbation and experimental observation of space charge waves in the University Of Maryland Electron Ring (UMER)

J.C.T. Thangaraj; Donald W. Feldman; R. A. Kishek; S. Bernal; M. Reiser; D. Stratakis; M. Walter; K. Tian; D. Sutter; B. Beaudoin; R. Fiorito; G. Bai; I. Haber; R.G. O'Shea

The University of Maryland Electron Ring (UMER) is a scaled model to investigate the transverse and longitudinal physics of space charge dominated beams. It uses a 10-keV electron beam along with other scaled beam parameters that model the larger machines but at a lower cost. Understanding collective behavior of intense, charged particle beams due to their space charge effects is crucial for advanced accelerator research and applications. This paper presents an experimental study of longitudinal dynamics of an initial density modulation on a space-charge dominated beam. A novel experimental technique of producing a perturbation using a laser is discussed.Using a laser to produce a perturbation provides the ability to launch a pure density modulation and to have better control over the amount of perturbation introduced. Collective effects like space charge waves and their propagation over long distances in a quadrupole channel are studied.A one dimensional cold fluid model is used for theoretical analysis and simulations are carried out in WARP-RZ.


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

Combined thermionic and photoelectric emission from dispenser cathodes

Donald W. Feldman; A. Valfells; J. Neumann; J. Harris; B. Beaudoin; P.G. O'Shea; M. Virgo

Photoelectric emission from dispenser cathodes has been studied earlier. Photoelectric emission in conjunction with themionic emission can provide a convenient and flexible means of modulating emission from thermionic cathodes with programmable formats and high bandwidth. This may be useful for experimental studies the beam dynamics of space charge dominated beams, such as in the University of Maryland electron ring (UMER). We have studied combined photoelectric and thermionic emission from a dispenser cathode using a nitrogen laser operating at 337 nm. Results will be presented for the effect on emission of laser intensity, cathode temperature, and accelerating voltage.


Proceedings of the 2003 Particle Accelerator Conference | 2003

Beam transport experiments over half-turn at the University of Maryland Electron Ring (UMER)

S. Bernal; B. Beaudoin; Y. Cui; Donald W. Feldman; R. Feldman; M. Glanzer; T. Godlove; I. Haber; J. Harris; M. Holloway; Y. Huo; R. A. Kishek; D. Lamb; W. Lee; H. Li; B. Quinn; M. Reiser; A. Valfells; M. Walter; M. Wilson; R. Yun; Y. Zou; P.G. O'Shea

The University of Maryland Electron Ring (UMER), designed for studies of space-charge dominated beam transport in a strong focusing lattice, is nearing completion. UMER models, for example, the recirculator machine envisioned as a possible driver for heavy-ion inertial fusion. The UMER lattice consists of 36 FODO periods distributed among 18, 20/spl deg/-bending sections containing two dipole magnets each. The main diagnostics are phosphor screens and capacitive beam position monitors placed at the center of each bending section. In addition, pepper-pot and slit-wire emittance meters, as well as an energy analyzer are in operation. We present here results of beam matching and characterization for a range of currents extending from about 1 mA to 100 mA, all at 10 keV and 100 ns pulse duration. With typical focusing given by /spl sigma//sub 0/=76, the zero-current betatron phase advance per period, the range of currents corresponds to tune depressions of 0.8 to 0.2. This range covers both the emittance dominated and extreme space-charge dominated regimes, which is unprecedented for a circular machine.


bipolar/bicmos circuits and technology meeting | 2003

Initial studies of longitudinal dynamics on UMER

J. Harris; A. Valfells; B. Beaudoin; S. Bernal; A. Diep; I. Haber; Y. Huo; B. Quinn; M. Reiser; M. Walter; P.G. O'Shea

The University of Maryland Electron Ring (UMER) is a small-scale experiment on space-charge dominated beams. The 100 ns, 10 keV electron beam fills up nearly one-half of the ring circumference. Here we review two models for the evolution of such beams, and present some initial results of measurements of longitudinal beam expansion for two initial line charge profiles.


ieee particle accelerator conference | 2007

Application Of Induction Module For Energy perturbations in The University of Maryland Electron Ring

B. Beaudoin; S. Bernal; I. Haber; R. A. Kishek; M. Reiser; K. Tian; J.C.T. Thangaraj; M. Walter; C. Wu; P.G. O'Shea

The University of Maryland Electron Ring (UMER) is a scaled storage ring using low-energy electrons to inexpensively model beams with high space-charge. With the ability to inject such beams comes the problem of longitudinal end erosion of both the head and tail. It is important therefore to apply suitably designed longitudinal focusing forces to confine the beam and prevent it from its normal expansion. This paper presents the design and prototyping of an induction cell for this purpose. Successful operation of the induction cell would push the achievable number of turns and also enable us to perform studies of the longitudinal physics of such highly space-charge dominated beams. The pulsed voltage requirements for such a system on UMER would require ear-fields that switch 3 kV in about 8 ns or so for the most intense flat-top rectangular beam injected into the ring. This places a considerable challenge on the electronics used to deliver ideal waveforms with a compact module. Alternate waveforms are also being explored for other various injected beam shapes into UMER.


ADVANCED ACCELERATOR CONCEPTS: 12th Advanced Accelerator Concepts Workshop | 2006

New Developments in Space‐Charge Beam Physics Research at the University of Maryland Electron Ring (UMER)

S. Bernal; G. Bai; B. Beaudoin; Donald W. Feldman; R. Feldman; R. Fiorito; T. Godlove; I. Haber; R. A. Kishek; C. Papadopoulos; B. Quinn; M. Reiser; D. Stratakis; D. Sutter; K. Tian; J.C.T. Thangaraj; M. Walter; C. Wu; P. G. O’Shea

The University of Maryland electron ring (UMER) is a low‐energy, high current recirculator for beam physics research with relevance to any applications that rely on intense beams of high quality. We review the space‐charge physics issues, both in transverse and longitudinal beam dynamics, which are currently being addressed with UMER: emittance growth and halo formation, strongly asymmetric beams, Montague resonances, equipartitioning, bunch capture and shaping, etc. Furthermore, we report on recent developments in experiments, simulations, and improved diagnostics for space‐charge dominated beams.

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H. Zhang

University of Liverpool

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A. Ting

United States Naval Research Laboratory

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J. Rodgers

United States Naval Research Laboratory

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B. Quinn

University of Maryland

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