IBIC2017 - List of Authors (Gu, X.)

Paper	Title	Page
MOPCC04	Simulation of Beam-Beam Tune Spread Measurement With Beam Transfer Function in RHIC	44
	Y. Luo, W. Fischer, X. Gu BNL, Upton, Long Island, New York, USA
	Funding: This work was supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy Head-on beam-beam compensation had been successfully implemented routinely in the 2015 polarized proton operation in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Two electron lenses have been used to reduce the incoherent beam-beam tune spread to allow a larger proton bunch intensity and therefore a higher luminosity. Beam transfer function was used to determine the beam-beam incoherent tune spread. In this article, we carry out numeric simulations to compare the tune spreads derived from tune histogram and the beam transfer function. Then we present the experimental beam transfer function measurements and extract the tune spreads due to beam-beam interaction and electron lens. Experimental results show that the electron lens reduced the beam-beam tune spread.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCC04
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TH1AB4	Status of the LEReC Machine Protection System	487
	S. Seletskiy, Z. Altinbas, D. Bruno, M.R. Costanzo, A.V. Fedotov, D.M. Gassner, X. Gu, L.R. Hammons, J. Hock, P. Inacker, J.P. Jamilkowski, D. Kayran, J. Kewisch, C. Liu, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, W.E. Pekrul, I. Pinayev, V. Ptitsyn, K.S. Smith, R. Than, P. Thieberger, J.E. Tuozzolo, W. Xu, Z. Zhao BNL, Upton, Long Island, New York, USA
	The low energy RHIC Electron Cooler (LEReC) will be operating with the electron beams having up to 140 kW power. It was determined that the missteered electron beam can damage the vacuum chamber and in-vacuum components within 20 us. We protect our accelerator against such a catastrophic scenario by a dedicated machine protection system (MPS). In this paper we describe the current status of the LEReC MPS work. We consider our experience with the commissioning and operation of the scaled down MPS system used for the LEReC gun test beamline and discuss the work on the MPS designed for the commissioning of the full LEReC accelerator.
	Slides TH1AB4 [2.906 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TH1AB4
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Paper

Title

Page

Simulation of Beam-Beam Tune Spread Measurement With Beam Transfer Function in RHIC

44

Y. Luo, W. Fischer, X. Gu
BNL, Upton, Long Island, New York, USA

Funding: This work was supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
Head-on beam-beam compensation had been successfully implemented routinely in the 2015 polarized proton operation in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Two electron lenses have been used to reduce the incoherent beam-beam tune spread to allow a larger proton bunch intensity and therefore a higher luminosity. Beam transfer function was used to determine the beam-beam incoherent tune spread. In this article, we carry out numeric simulations to compare the tune spreads derived from tune histogram and the beam transfer function. Then we present the experimental beam transfer function measurements and extract the tune spreads due to beam-beam interaction and electron lens. Experimental results show that the electron lens reduced the beam-beam tune spread.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCC04

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TH1AB4

Status of the LEReC Machine Protection System

487

S. Seletskiy, Z. Altinbas, D. Bruno, M.R. Costanzo, A.V. Fedotov, D.M. Gassner, X. Gu, L.R. Hammons, J. Hock, P. Inacker, J.P. Jamilkowski, D. Kayran, J. Kewisch, C. Liu, K. Mernick, T.A. Miller, M.G. Minty, M.C. Paniccia, W.E. Pekrul, I. Pinayev, V. Ptitsyn, K.S. Smith, R. Than, P. Thieberger, J.E. Tuozzolo, W. Xu, Z. Zhao
BNL, Upton, Long Island, New York, USA

The low energy RHIC Electron Cooler (LEReC) will be operating with the electron beams having up to 140 kW power. It was determined that the missteered electron beam can damage the vacuum chamber and in-vacuum components within 20 us. We protect our accelerator against such a catastrophic scenario by a dedicated machine protection system (MPS). In this paper we describe the current status of the LEReC MPS work. We consider our experience with the commissioning and operation of the scaled down MPS system used for the LEReC gun test beamline and discuss the work on the MPS designed for the commissioning of the full LEReC accelerator.

Slides TH1AB4 [2.906 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TH1AB4

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)