1.
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Observations and predictions at CesrTA, and outlook for ILC
/ Dugan, G. (Cornell U., CLASSE) ; Billing, M. (Cornell U., CLASSE) ; Butler, K. (Cornell U., CLASSE) ; Chu, J. (Cornell U., CLASSE) ; Crittenden, J. (Cornell U., CLASSE) ; Forster, M. (Cornell U., CLASSE) ; Kreinick, D. (Cornell U., CLASSE) ; Meller, R. (Cornell U., CLASSE) ; Palmer, M. (Cornell U., CLASSE) ; Ramirez, G. (Cornell U., CLASSE) et al.
In this paper, we will describe some of the recent experimental measurements [1, 2, 3] performed at CESRTA [4], and the supporting simulations, which probe the interaction of the electron cloud with the stored beam. These experiments have been done over a wide range of beam energies, emittances, bunch currents, and fill patterns, to gather sufficient information to be able to fully characterize the beam-electron-cloud interaction and validate the simulation programs. [...]
arXiv:1310.0261.-
Geneva : CERN, 2013 - 11 p.
Fulltext: PDF; Published version from CERN: PDF; External link: Preprint
In : ECLOUD’12: Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects, pp.31-41
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2.
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3.
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Simulations of synchrotron-radiation-induced electron production in the CESR vacuum chamber wall
/ Crittenden, J A (Cornell U., CLASSE) ; Poprocki, S (Cornell U., CLASSE) ; Rubin, D L (Cornell U., CLASSE) ; Sagan, D (Cornell U., CLASSE)
We report on calculations of electron production by synchrotron radiation absorbed in the vacuum chamber walls of the Cornell Electron Storage Ring (CESR). These photo-electrons are the source of electron clouds which limit the performance of storage rings by causing betatron tune shifts, instabilities and emittance growth. [...]
2020 - 12 p.
Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.183-194 (CERN-2020-007)
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4.
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Comparing Behaviour of Simulated Proton Synchrotron Radiation in the Arcs of the LHC with Measurements
/ Guillermo Cantón, Gerardo (CERN) ; Ady, Marton (CERN) ; Angelucci, Marco (Frascati) ; Cimino, Roberto (Frascati) ; Kersevan, Roberto (CERN) ; La Francesca, Eliana (Frascati) ; Sagan, David (Cornell U., CLASSE) ; Zimmermann, Frank (CERN)
In previous work it was shown that at high proton-beam energies, synchrotron radiation is an important source of beam-screen heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can contribute to electron cloud formation. We have used the Synrad3D code developed at Cornell to simulate the photon distributions in the arcs of the LHC, HL-LHC, and FCC-hh. [...]
CERN-ACC-2017-209.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPVA011
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA011
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5.
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CesrTA Retarding Field Analyzer Measurements in Drifts, Dipoles, Quadrupoles and Wigglers
/ Calvey, J R (Cornell U., CLASSE) ; Li, Y (Cornell U., CLASSE) ; Livezey, J A (Cornell U., CLASSE) ; Makita, J (Cornell U., CLASSE) ; Meller, R E (Cornell U., CLASSE) ; Palmer, M A (Cornell U., CLASSE) ; Schwartz, R M (Cornell U., CLASSE) ; Strohman, C R (Cornell U., CLASSE) ; Harkay, K (ALCF, Argonne) ; Calatroni, S (CERN) et al.
Over the course of the CesrTA program, the Cornell Electron Storage Ring (CESR) has been instrumented with several retarding field analyzers (RFAs), which measure the local density and energy distribution of the electron cloud. These RFAs have been installed in drifts, dipoles, quadrupoles, and wigglers; and data have been taken in a variety of beam conditions and bunch configurations [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPD023
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6.
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Synchrotron-Radiation Photon Distribution for Highest Energy Circular Colliders
/ Maury Cuna, GHI (Merida, IPN) ; Sagan, D (Cornell U., CLASSE) ; Dugan, G (Cornell U., CLASSE) ; Zimmermann, F (CERN)
At high energies, beam-induced synchrotron radiation is an important source of heating, beam-related vacuum pressure increase, and primary photoelectrons, which can give rise to an electron cloud. The photon distribution along the beam pipe wall is a key input to codes such as ECLOUD and PyECLOUD, which model the electron cloud build-up. [...]
CERN-ACC-2013-0128.-
Geneva : CERN, 2013 - 3 p.
Fulltext: PDF;
In : 4th International Particle Accelerator Conference, Shanghai, China, 12 - 17 May 2013, pp.1340
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7.
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Examining mitigation schemes for synchrotron radiation in high-energy hadron colliders
/ Guillermo, G (Merida, IPN ; CERN) ; Sagan, D (Cornell U., CLASSE) ; Zimmermann, F (CERN)
At high proton-beam energies, beam-induced synchrotron radiation is an important source of heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can give rise to an electron cloud. We use the synrad3d code developed at Cornell to simulate the photon distributions in the arcs of several existing, planned, or proposed highest-energy hadron colliders to analyze the efficiency of several techniques developed, or proposed, to mitigate the negative effects of synchrotron radiation, such as a sawtooth surface and slots in the beam screen..
2018 - 7 p.
- Published in : Phys. Rev. Accel. Beams 21 (2018) 021001
Fulltext: PDF;
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8.
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Recommendation for the Feasibility of more Compact LC Damping Rings
/ Pivi, M.T.F. (SLAC) ; Wang, L. (SLAC) ; Demma, T. (Frascati) ; Guiducci, S. (Frascati) ; Suetsugu, Y. (KEK, Tsukuba) ; Shibata, K. (KEK, Tsukuba) ; Ohmi, K. (KEK, Tsukuba) ; Dugan, G. (Cornell U.) ; Palmer, M. (Cornell U.) ; Crittenden, J.A. (Cornell U.) et al.
As part of the international Linear Collider (ILC) collaboration, we have compared the electron cloud (EC) effect for different Damping Ring (DR) designs respectively with 6.4 km and 3.2 km circumference and investigated the feasibility of the shorter damping ring with respect to the electron cloud build-up and related beam instabilities. The studies for a 3.2 km ring were carried out with beam parameters of the ILC Low Power option [...]
2010
External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPE097
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9.
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Electron Cloud Modeling Results for Time-resolved Shielded Pickup Measurements at CesrTA
/ Crittenden, J A (Cornell U., CLASSE) ; Li, Y (Cornell U., CLASSE) ; Liu, X (Cornell U., CLASSE) ; Palmer, M A (Cornell U., CLASSE) ; Sikora, J P (Cornell U., CLASSE) ; Calatroni, S (CERN) ; Rumolo, G (CERN)
The Cornell Electron Storage Ring Test Accelerator (CesrTA) program includes investigations into electron cloud buildup, applying various mitigation techniques in custom vacuum chambers. Among these are two 1.1 meter long sections located symmetrically in the east and west arc regions. [...]
2011
External link: Published version from JACoW
In : 2011 Particle Accelerator Conference, New York City, NY, USA, 28 Mar - 1 Apr 2011, pp.WEP142
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10.
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Electron Cloud Build Up for LHC Sawtooth Vacuum Chamber
/ Guillermo Cantón, Gerardo (CERN ; CINVESTAV, IPN) ; Maury Cuna, Georfrey (Guanajuato U.) ; Ocampo, Edgar (Guanajuato U.) ; Zimmermann, Frank (CERN)
At high proton-beam energies, beam-induced synchrotron radiation is an important source of heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can give rise to an electron cloud. For the arcs of LHC a sawtooth pattern had been imprinted on the horizontally outward side of the vacuum chamber in order to locally absorb synchrotron radiation photons without dispersing them all around the chamber. [...]
CERN-ACC-2018-065.-
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF030
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF030
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