Beam induced electron cloud resonances in dipole magnetic fields

Calvey, Joseph; Hartung, W.; Makita, Junki; Venturini, M.

doi:10.1103/physrevaccelbeams.19.074401

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…In accelerator vacuum chambers, the formation of electron clouds could be one of the significant sources of beam-induced heat loads such as synchrotron radiation (SR), geometrical impedances, and resistive wall heating [1]- [7]. Furthermore, serious electron multipacting (MP), which means resonant electron discharge phenomena in materials with high secondary electron yield (SEY), with charged particle beams in the chambers have been also reported in literature with numerical simulations, direct measurements, and indirect observation of vacuum pressure rise [1,8]- [10]. The beam-induced electron MP (BIEM), which gives rise to demerits of beam energy loss and chamber heating, is based on a mechanism that the electrons are kicked and multiplied by wakefields (WFs) of passing bunch trains [1,10].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, serious electron multipacting (MP), which means resonant electron discharge phenomena in materials with high secondary electron yield (SEY), with charged particle beams in the chambers have been also reported in literature with numerical simulations, direct measurements, and indirect observation of vacuum pressure rise [1,8]- [10]. The beam-induced electron MP (BIEM), which gives rise to demerits of beam energy loss and chamber heating, is based on a mechanism that the electrons are kicked and multiplied by wakefields (WFs) of passing bunch trains [1,10]. The electron MP phenomena are also commonplace in radiofrequency (RF) devices such as normal and superconducting cavities and fundamental power couplers [11].…”

Section: Introductionmentioning

confidence: 99%

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Beam-induced electron multipacting with mode resonance in a vacuum chamber

Cha¹,

Jauregui²,

Grau³

et al. 2021

J. Inst.

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Some vacuum chambers in particle accelerators perform a waveguide- or resonator-like behavior due to their unique geometries. Electron multipacting caused by such a structural property might be able to overwhelm the classical beam-induced multipacting. This article shows that the wakefields of particle beams could stimulate the resonant modes of a vacuum chamber with a near-rectangular waveguide shape and accordingly induce much stronger electron avalanche in the chamber. Especially, it has been believed that the multipacting is responsible for pressure rise in a vacuum chamber, where energetic secondary electrons with growing numbers collide with gas particles at the chamber wall. Based on numerical simulations, the electron multipacting mechanism with the mode resonance is proposed, which can explain the significant pressure variation measured in our cryogenic vacuum chamber.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beam-induced electron multipacting with mode resonance in a vacuum chamber

Cha¹,

Jauregui²,

Grau³

et al. 2021

J. Inst.

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“…The goal is to 1) characterize and quantify the production mechanisms, 2) compare these with computer simulations, 3) develop methods to mitigate the EC effects, and 4) study the related beam dynamics and instabilities. [11][12][13][14][15] To meet these goals a number of instruments in CESR required significant upgrades or complete development of new designs and subsequent implementation. The simultaneous or coordinated data acquisition of the ensemble of instruments, which is required during specific measurement sequences is described below in the following broad categories:…”

Section: Introductionmentioning

confidence: 99%

Measurement techniques for low emittance tuning and beam dynamics at CESR

et al. 2018

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After operating as a High Energy Physics electron-positron collider, the Cornell Electron-positron Storage Ring (CESR) has been converted to become a dedicated synchrotron light source for the Cornell High Energy Synchrotron Source (CHESS). Over the course of several years CESR was adapted for accelerator physics research as a test accelerator, capable of studying topics relevant to future damping rings, colliders and light sources. Initially some specific topics were targeted for accelerator physic research with the storage ring in this mode, labeled CesrTA. These topics included 1) tuning techniques to produce low emittance beams, 2) the study of electron cloud (EC) development in a storage ring and 3) intra-beam scattering effects. The complete conversion of CESR to CesrTA occurred over a several year period, described elsewhere [1][2][3]. A number of specific instruments were developed for CesrTA. Much of the pre-existing instrumentation was modified to accommodate the scope of these studies and these are described in a companion paper [4]. To complete this research, a number of procedures were developed or modified, often requiring coordinated measurements among different instruments [5]. This paper provides an overview of types of measurements employed for the study of beam dynamics during the operation of CesrTA.

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Measurement Techniques for Low Emittance Tuning and Beam Dynamics at CESR

Billing,

Dobbins,

Forster

et al. 2018

Preprint

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A: After operating as a High Energy Physics electron-positron collider, the Cornell Electron-positron Storage Ring (CESR) has been converted to become a dedicated synchrotron light source for the Cornell High Energy Synchrotron Source (CHESS). Over the course of several years CESR was adapted for accelerator physics research as a test accelerator, capable of studying topics relevant to future damping rings, colliders and light sources. Initially some specific topics were targeted for accelerator physic research with the storage ring in this mode, labeled CesrTA. These topics included 1) tuning techniques to produce low emittance beams, 2) the study of electron cloud (EC) development in a storage ring and 3) intra-beam scattering effects. The complete conversion of CESR to CesrTA occurred over a several year period, described elsewhere [1][2][3]. A number of specific instruments were developed for CesrTA. Much of the pre-existing instrumentation was modified to accommodate the scope of these studies and these are described in a companion paper [4]. To complete this research, a number of procedures were developed or modified, often requiring coordinated measurements among different instruments [5]. This paper provides an overview of types of measurements employed for the study of beam dynamics during the operation of CesrTA.

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Beam induced electron cloud resonances in dipole magnetic fields

Cited by 3 publications

References 25 publications

Beam-induced electron multipacting with mode resonance in a vacuum chamber

Beam-induced electron multipacting with mode resonance in a vacuum chamber

Measurement techniques for low emittance tuning and beam dynamics at CESR

Measurement Techniques for Low Emittance Tuning and Beam Dynamics at CESR

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