| Paper |
Title |
Page |
| S702 |
Plasma Lens in Parametric Resonance Ionization Cooling |
57 |
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- K. Yonehara
Fermilab, Batavia, Illinois, USA
- Y.S. Derbenev, V.S. Morozov, A.V. Sy
JLab, Newport News, Virginia, USA
- R.P. Johnson
Muons, Inc, Illinois, USA
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We present a concept of a plasma lens in a parametric resonance ionization cooling (PIC) for extra cooling of muon colliders. The PIC concept has been developed to overcome most aberrations. However, parasitic non-linear aberrations which is induced in an ionization cooling material still reduce a dynamic aperture of the PIC. The plasma lens generates an azimuthally symmetric focusing field in gas-filled RF cavities that is several orders of magnitude stronger than the conventional superconducting magnets. It allows for reduction of the beam size at the beam expansion points. This reduces the size of the aberrations and therefore greatly simplifies their compensation.
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Slides S702 [18.566 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-COOL2021-S702
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| About • |
paper received ※ 02 November 2021 paper accepted ※ 13 December 2021 issue date ※ 13 November 2021 |
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| P1008 |
Electron Cooling using a Pulsed and Dithering beam from an Electrostatic Electron Cooler |
81 |
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- M.W. Bruker, S.V. Benson, A. Hutton, K. Jordan, T. Powers, R.A. Rimmer, T. Satogata, A.V. Sy, H. Wang, S. Wang, H. Zhang, Y. Zhang
JLab, Newport News, Virginia, USA
- J. Li, F. Ma, X.M. Ma, L.J. Mao, X.P. Sha, J.C. Yang, X.D. Yang, H.W. Zhao
IMP/CAS, Lanzhou, People’s Republic of China
- H. Zhao
BNL, Upton, New York, USA
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Funding: DOE NP, contract DE-AC05-06OR23177. International Partnership Program of Chinese Academy of Sciences, Grant No. 113462KYSB20170051, and the National Natural Science Foundation of China, No. 11575264.
Electron cooling continues to be an invaluable technique to reduce and maintain the emittance in hadron storage rings such as the EIC and EICC where stochastic cooling is inefficient and radiative cooling is negligible. Extending the energy range of electron coolers beyond what is feasible with the conventional, electrostatic approach necessitates the use of RF fields for acceleration and, thus, a bunched electron beam. To experimentally investigate how the relative time structure of the two beams affects the cooling properties, we have set up a pulsed-beam cooling device by adding a synchronized pulsing circuit to the conventional electron source of the CSRm cooler at Institute of Modern Physics. Using both constant and modulated synchronization between electron pulses and ion bunches, we have measured the effects of the electron bunch length and longitudinal ion focusing strength on the temporal evolution of the longitudinal and transverse ion beam profile and demonstrated the detrimental effect of timing jitter as predicted by space-charge theory and simulations. Our experiment suggests a need for further investigations of specific aspects of bunched cooling such as synchro-betatron coupling and phase dithering effects when using short electron bunches to cool longer ion bunches. However, given the comparatively long IBS lifetime of higher-energy proton storage rings like the EIC, slow dithering could potentially provide an option to save cost on the electron cooler linac.
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Poster P1008 [4.213 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-COOL2021-P1008
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| About • |
paper received ※ 05 November 2021 paper accepted ※ 13 December 2021 issue date ※ 14 November 2021 |
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