On the optimum dispersion of a storage ring for electron cooling with high space charge

Bosser, J.; Carli, C.; Chanel, M.; Marie, Luke St.; Möhl, D.; Tranquille, G.

doi:10.1016/s0168-9002(99)01109-2

Cited by 8 publications

(1 citation statement)

References 4 publications

(1 reference statement)

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“…An unexpected strong influence of dispersion leading to increased cooling rates seen in previous studies [18,19] could certainly be explored further by utilizing a combination of ϕ ϵδ measurements while making variations in the β x =D x ratio at the electron cooler. Additionally, changes to electron cooler parameters, such as the e − beam energy, density, and, most importantly, the transverse radius, while monitoring this quantity would also be of great interest.…”

Section: Discussionmentioning

confidence: 97%

Novel transverse emittance measurements for electron cooling characterization

Hunt

Resta-López

Welsch

et al. 2020

Phys. Rev. Accel. Beams

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The extra low energy antiproton ring (ELENA) finished commissioning before the start of CERN's second long shutdown in December 2018, successfully providing beams to a new experimental zone. In 2021, ELENA will begin distributing cooled 100 keV antiproton beams to all antimatter experiments. To counteract beam blowup due to deceleration, ELENA will employ the use of an electron cooler. Measurements under similar circumstances, such as at the antiproton decelerator at CERN, have shown electron cooling causing non-Gaussian beam profiles. This effect, combined with nonzero dispersion at the location of the scraper in ELENA, presents new challenges in the use of ELENA's scraper to determine the emittance during the deceleration cycle. Two new scraper algorithms have been developed and used to show the first evidence of significant electron cooling in ELENA, at 650 and 100 keV energy plateaus. The algorithms are capable of estimating the longitudinal momentum spread of the beams and accurately determining emittances for non-Gaussian beams in dispersive regions. Additionally, utilizing combinations of measurements from opposing scraper blades, additional information on the beam's evolution is presented, suggesting a correlation between the emittance and longitudinal momentum offset of individual particles. Finally, considerations for further studies in ELENA and similar machines are presented.

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Section: Discussionmentioning

confidence: 97%

Novel transverse emittance measurements for electron cooling characterization

Hunt

Resta-López

Welsch

et al. 2020

Phys. Rev. Accel. Beams

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Cooling

Minty¹,

Zimmermann²

2003

Particle Acceleration and Detection

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Many applications of particle accelerators require beam cooling, which refers to a reduction of the beam phase space volume or an increase in the beam density via dissipative forces. In electron and positron storage rings cooling naturally occurs due to synchrotron radiation, and special synchrotron-radiation damping rings for the production of low-emittance beams are an integral part of electron-positron linear colliders. For other types of particles different cooling techniques are available. Electron cooling and stochastic cooling of hadron beams are used to accumulate beams of rare particles (such as antiprotons), to combat emittance growth (e.g., due to scattering on an internal target), or to produce beams of high quality for certain experiments. Laser cooling is employed to cool ion beams down to extremely small temperatures. Here the laser is used to induce transitions between the ion electronic states and the cooling exploits the Dopper frequency shift. Electron beams of unprecedentedly small emittance may be obtained by a different type of laser cooling, where the laser beam acts like a wiggler magnet. Finally, designs of a future muon collider rely on the principle of ionization cooling. Reference [1] gives a brief review of the principal ideas and the history of beam cooling in storage rings; a theoretical dicussion and a few practical examples can be found in [2].

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Optimum lattice functions for electron cooling

Bosser

Carli

Chanel

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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Cooling down time measurements carried out at LEAR with 4.2 MeV/nucleon Pb 54+ ions and various combinations of lattice functions led to unexpected results. Notably, a finite dispersion was found to decrease strongly the horizontal cooling down times. Furthermore, intermediate betatron functions yielded shorter cooling down times than large ones and an increase of the cooler length by a factor 2 did not lead to the expected increase in the cooling rate. The aim of this report is to explain, at least qualitatively, the experimental observations. Notably, a finite dispersion was found to decrease strongly the horizontal cooling down times. Furthermore, intermediate betatron functions yielded shorter cooling down times than large ones and an increase of the cooler length by a factor 2 did not lead to the expected increase in the cooling rate. The aim of this report is to explain, at least qualitatively, the experimental observations.

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On the optimum dispersion of a storage ring for electron cooling with high space charge

Cited by 8 publications

References 4 publications

Novel transverse emittance measurements for electron cooling characterization

Novel transverse emittance measurements for electron cooling characterization

Cooling

Optimum lattice functions for electron cooling

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