The experimental study on beam-photoelectron instability in BEPC

Guo, Zhen; Huang, He; Li, S.P.; Liu, D.K.; Qin, Q.; Wang, L.F.; Wang, J.Q.; Wang, S.H.; Zhang, C.; Zhou, Feng; Chin, Y.H.; Fukuma, H.; Hiramatsu, S.; Izawa, M.; Kasuga, T.; Kikutani, E.; Kobayashi, Yukinori; Kurokawa, S.; Ohmi, K.; Sato, Yoichi; Suetsugu, Y.; Tobiyama, M.; Yokoya, K.; Zhang, X.L.

doi:10.1109/pac.1997.750760

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…The so-called Ohmi effect [82] refers to a coupled-bunch instability caused by the electron cloud. This instability was first seen at the KEK photon factory [82,83] and later verified at BEPC [84].…”

Section: Case Study Iv: Minimum Emittance Latticementioning

confidence: 73%

Tutorial on linear colliders

Zimmermann¹

2001

AIP Conference Proceedings

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Proceeding from the collision point towards the source, we discuss purpose and design concepts of the various linear-collider subsystems, as well as important mechanisms of emittance dilution, beam diagnostics, and advanced tuning methods. In particular, we address beamstrahlung, linac emittance degradation due to dispersion and wake fields, scaling of damping-ring parameters with collider energy, fast beam-ion and electron-cloud instabilities, coherent synchrotron radiation, and rf guns. Five case studies are examined in detail.

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Section: Case Study Iv: Minimum Emittance Latticementioning

confidence: 73%

Tutorial on linear colliders

Zimmermann¹

2001

AIP Conference Proceedings

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“…Electron cloud (EC) may induce the beam instabilities [1,2], the emittance growth [3,4], heat load on cryogenic sections [4] and vacuum instability, etc., which have been observed at KEKB [5], BEPC [6], and CERN SPS [7,8]. In order to reduce EC effect, various methods, such as TiN film [9,10], amorphous carbon coatings [11], the laser ablation technique [12,13], etc., have been proposed.…”

Section: Introductionmentioning

confidence: 99%

The secondary electron yields and related surface properties evolution of laser treated stainless steel induced by different ultrasonic cleaning duration

Wang

You

et al. 2021

J. Inst.

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As a novel method, laser treatment was proposed to be applied on the surface modification of stainless steel 316L commonly used in accelerator vacuum system to mitigate the secondary electron emission. However, the final property of the material surfaces, especially the secondary electron yield (SEY) property depends on a rather large number of factors, among them are the surface cleaning scenarios needed before installation. In particular, the surface morphologies and surface chemical states may be changed during the ultrasonic cleaning used for laser treated stainless steel surfaces. Therefore, the influence of ultrasonic cleaning duration on the surface composition, surface morphology and secondary electron characteristics of stainless steel were studied for the first time. The secondary electron yield test results demonstrated that the maximum SEY (δ max) of laser treated stainless steel samples increased with the increase of ultrasonic cleaning time. After ultrasonic cleaning in acetone and absolute ethyl alcohol each for 3 minutes, 10 minutes and 15 minutes, respectively, the δ max of laser treated stainless steel samples increased about 0.7%–1.7%, 1.3%–2.4% and 4.9%–15.3%, respectively, compared with that of uncleaned laser treated ones. The surface morphologies, surface roughness, surface chemical states related to the SEY evolution were also evaluated and analyzed.

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“…Since the electron cloud instability (ECI) was first observed on the Beijing Electron Positron Collider (BEPC) in 1996 [1], many experiments have been carried out to study the characteristics of the ECI, the generation of electron cloud (EC), and its effect on the beam performance. In the meantime, analyses and simulations on the ECI in the BEPC storage ring were also done [2].…”

Section: Introductionmentioning

confidence: 99%

Electron cloud instability studies in the Beijing Electron Positron Collider

Wang

Guo

Liu

et al. 2004

Phys. Rev. ST Accel. Beams

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The electron cloud instability (ECI) in the Beijing Electron Positron Collider (BEPC) was studied systematically with experiments and simulations in recent years. Several electron cloud detectors have been installed into the BEPC storage ring to measure the electron yield. The effects of solenoid, the clearing electrode, the chromaticity, and the octupole on ECI have been investigated in BEPC experimentally. To evaluate the ECI in BEPCII, the upgrade project of BEPC, a computer code has been developed to simulate the electron density in the antechamber under different conditions, as well as the progress of the single bunch and coupled-bunch instabilities caused by the electron cloud. The experimental and simulation results, as well as the activities, are reported in this paper.

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The experimental study on beam-photoelectron instability in BEPC

Cited by 5 publications

References 2 publications

Tutorial on linear colliders

Tutorial on linear colliders

The secondary electron yields and related surface properties evolution of laser treated stainless steel induced by different ultrasonic cleaning duration

Electron cloud instability studies in the Beijing Electron Positron Collider

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