Suppression of secondary emission in a magnetic field using triangular and rectangular surfaces

Wang, L.; Raubenheimer, T.O.; Stupakov, Gennady

doi:10.1016/j.nima.2006.11.039

Cited by 28 publications

(25 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So, if only electrons emitted from the surface at grazing incidence "see" the beam, and the ones emitted at normal incidence are shadowed by the surface itself, than a net reduction in SEY is expected. Pioneering work [180][181][182][183][184] has been performed and different types of grooves have been theoretically analyzed and then their SEY has been measured. We show in Fig.…”

Section: Geometrical Modificationmentioning

confidence: 99%

Electron cloud in accelerators

Cimino

Demma

2014

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

Low energy electrons in accelerators are known to interact with the circulating beam, giving rise to the formation of a so-called e − cloud. Such e − cloud may induce detrimental effects on the accelerated beam quality and stability. Those effects have been observed in most accelerators of positively charged particles. A longstanding effort has been so far devoted to understand in detail the physical origin of such e − cloud, its build-up and its interaction with the circulating beam. We will first describe the origin and the basic features causing e − cloud formation in accelerators, then we review some of the theoretical work produced to simulate and analyze such phenomenon. In selected cases, theoretical expectations and experimental observations will be compared, to address the importance of benchmarking codes versus observations to reach the required predictive capability. To this scope, codes need realistic input parameters which correctly describe material and surface properties at the basis of such e − cloud formation and build-up. The experimental efforts, performed worldwide in many surface and material science laboratories, to measure such essential parameters will then be presented and critically reviewed. Finally, we will describe some of the e − cloud mitigation strategies adopted so far and draw some conclusions.

show abstract

Section: Geometrical Modificationmentioning

confidence: 99%

Electron cloud in accelerators

Cimino

Demma

2014

Int. J. Mod. Phys. A

View full text Add to dashboard Cite

show abstract

“…A triangular groove angle of 20 degrees is effective to decrease the SEY well below unity. For a more complete analysis of triangular groove with smaller angles see [13,14].…”

Section: Effect Of Magnetic Fieldmentioning

confidence: 99%

Sharp reduction of the secondary electron emission yield from grooved surfaces

Pivi

King²,

Kirby³

et al. 2008

Journal of Applied Physics

Self Cite

170

View full text Add to dashboard Cite

The effect of an artificially-enhanced rough surface on the secondary electron emission yield (SEY) was investigated both theoretically and experimentally. Analytical studies on triangular and rectangular grooved surfaces show the connection between the characteristic parameters of a given geometry to the SEY reduction. The effect of a strong magnetic field is also discussed. SEY of grooved samples have been measured and the results agree with Monte-Carlo simulations. Submitted to Journal of Applied Physics AbstractThe effect of an artificially-enhanced rough surface on the secondary electron emission yield (SEY) was investigated both theoretically and experimentally. Analytical studies on triangular and rectangular grooved surfaces show the connection between the characteristic parameters of a given geometry to the SEY reduction. The effect of a strong magnetic field is also discussed. SEY of grooved samples have been measured and the results agree with Monte-Carlo simulations.

show abstract

“…A clearing electrode [6] or a triangular grooved chamber [7] can easily suppress the electron multipacting. Recently an electron-cloud clearing electrode was successfully tested at the CERN PS [8].…”

Section: Other Remediesmentioning

confidence: 99%

Electron cloud in the wigglers of the position dampling ring of the international linear collider

Wang

Zimmermann

2007

2007 IEEE Particle Accelerator Conference (PAC)

Self Cite

View full text Add to dashboard Cite

The ILC positron damping ring comprises hundreds of meters of wiggler sections, where many more photons than in the arcs are emitted, and with the smallest beampipe aperture of the ring. A significant electron-cloud density can therefore be accumulated via photo-emission and via beam-induced multipacting. In field-free regions the electron-cloud build up may be suppressed by adding weak solenoid fields, but the electron cloud remaining in the wigglers as well as in the arc dipole magnets can still drive single-bunch and multi-bunch beam instabilities. This paper studies the electron-cloud formation in an ILC wiggler section for various scenarios, as well as its character, and possible mitigation schemes.

show abstract

Suppression of secondary emission in a magnetic field using triangular and rectangular surfaces

Cited by 28 publications

References 22 publications

Electron cloud in accelerators

Electron cloud in accelerators

Sharp reduction of the secondary electron emission yield from grooved surfaces

Electron cloud in the wigglers of the position dampling ring of the international linear collider

Contact Info

Product

Resources

About