Beam confinement in periodic permanent magnet focusing klystrons

Hess, Mark; Chen, Chiping

doi:10.1016/s0375-9601(02)00014-2

Cited by 13 publications

(13 citation statements)

References 10 publications

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“…4 This is potentially hazardous since offaxis dynamics can ultimately lead to collision between the charged beam and the conducting walls surrounding the focusing system. 4,5 Off-axis dynamics also represent a type of beam mismatch and it is of interest to learn whether or not off-axis beams can decay into equilibrium with accompanying emittance growth.…”

Section: Introductionmentioning

confidence: 99%

Combined centroid-envelope dynamics of intense, magnetically focused charged beams surrounded by conducting walls

2006

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In this paper we analyze the combined envelope-centroid dynamics of magnetically focused high-intensity charged beams surrounded by conducting walls. Similar to the case where conducting walls are absent, it is shown that the envelope and centroid dynamics decouple from each other. Mismatched envelopes still decay into equilibrium with simultaneous emittance growth, but the centroid keeps oscillating with no appreciable energy loss. Some estimates are performed to analytically obtain characteristics of halo formation seen in the full simulations.

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Section: Introductionmentioning

confidence: 99%

Combined centroid-envelope dynamics of intense, magnetically focused charged beams surrounded by conducting walls

2006

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“…Under the auspices of the grant (Chen, 2003a), we extended our treatment of the bunched beam confinement from our previous point-charge model (Hess and Chen, 2000and 2002b, Hess, 2002 to a finite-size bunched beam model (Hess and Chen, 2004), and successfully applied it to improving our understanding of the operational limit of highpower relativistic klystrons (Hess and Chen, 2004). We also explored the possibility of magnetic cusp formation in highly bunched annular beams (Hess and Chen, 2006 (Hess and Chen, 2004) We derived the space-charge limit for a train of periodic finite-size charged bunches which are slightly displaced from the axis of a circular, perfectly conducting pipe.…”

Section: High-power Klystron Researchmentioning

confidence: 99%

Coherent Structures and Chaos Control in High-Power Microwave Devices

Nachman¹,

Chen²

2006

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, Chen, 2003). In particular, we conducted vigorous theoretical and computational investigations of coherent structures and chaos in a wide range of intense electron beam plasmas relevant to the development of high-power microwave sources for directed energy applications. The following is a brief summary of our research accomplishments in selected areas, while detailed findings are described in the preprints cited in this report. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air SUBJECT TERMS

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“…As an initial effort to generalize the previous model [4][5][6][7] to slow-wave structures, we pose the problem of determining the electrostatic Green function in an azimuthally symmetric slow-wave structure.…”

Section: Electrostatic Green's Function In a Slow-wave Structurementioning

confidence: 99%

“…Recent analytic and semi-analytic Green's function analyses to address these issues have resulted in confinement conditions for bunched pencil beams in round cylindrical pipes [4][5][6][7]. The model predicts beam losses, which have been measured in a number of periodic permanent magnet (PPM) focusing klystrons at SLAC and KEK [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we present updated comparisons between theory [4][5][6][7] and the PPM klystron experiments at SLAC [8,9,11] and KEK [10,12], and describe our initial efforts to generalize the previous model [4][5][6][7] to slow-wave structures. In particular, we derive an electrostatic Green's function for an azimuthally symmetric cylindrical conductor with small-amplitude axial variations of its radius.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional modeling of intense bunched beams in RF accelerators and sources

Bhatt

Hess

Chen

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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A three-dimensional model of intense bunched beams is developed for cylindrical and corrugated conducting pipes. Updated comparisons between the current limits derived from this model and experimental data from PPM focusing klystrons are presented. An electrostatic Green's function is formulated for azimuthally symmetric slowwave structures. Analytical and numerical results are presented for the potential of a periodic bunched pencil beam in a small-rippled waveguide approximation.

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Beam confinement in periodic permanent magnet focusing klystrons

Cited by 13 publications

References 10 publications

Combined centroid-envelope dynamics of intense, magnetically focused charged beams surrounded by conducting walls

Combined centroid-envelope dynamics of intense, magnetically focused charged beams surrounded by conducting walls

Coherent Structures and Chaos Control in High-Power Microwave Devices

Three-dimensional modeling of intense bunched beams in RF accelerators and sources

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