Attainment of a High-Quality Electron Beam for Fermilab’s 4.3 MeV Cooler

Shemyakin, A.; Burov, A.; Carlson, K.; Hu, M.; Kazakevich, Grigory; Kramper, B.; Kroc, Thomas; Leibfritz, J.; Nagaitsev, Sergei; Prost, L.; Pruss, S.; Saewert, G.; Schmidt, Charles W.; Seletskiy, Sergei; Sutherland, Mary; Tupikov, V.

doi:10.1063/1.2190123

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…The practical solution to alleviate this issue, proposed in [53], was to displace the electron beam trajectory parallel with respect to the antiproton beam orbit (a horizontal or vertical shift). To first approximation, the center of the electron beam is where the current density is the highest and the beam angles the smallest, hence the cooling force the largest.…”

Section: Electron Cooling With a Beam Offsetmentioning

confidence: 99%

The Recycler Electron Cooler

Shemyakin

Prost

2013

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The Recycler Electron cooler was the first (and so far, the only) cooler working at a relativistic energy (γ = 9.5). It was successfully developed in 1995-2004 and was in operation at Fermilab in 2005-2011, providing cooling of antiprotons in the Recycler ring. This paper describes the cooler, difficulties in achieving the required electron beam parameters and the ways to overcome them, cooling measurements, and details of operation.

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Section: Electron Cooling With a Beam Offsetmentioning

confidence: 99%

The Recycler Electron Cooler

Shemyakin

Prost

2013

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“…The achieved 0.1% calibration accuracy was crucial not only for magnetic field mapping but possibility for matching the energies of electron and antiproton beams as well. For procedure details refer to [4] and to [5] for how the matching was successfully achieved. The first measurements were made with the lead trim-solenoids on and the return trim-and main solenoids off.…”

Section: Longitudinal Fieldmentioning

confidence: 99%

Magnetic Field Measurement and Compensation in the Recycler Electron Cooler

Tupikov¹,

Kazakevich²,

Kroc³

et al. 2006

AIP Conference Proceedings

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Abstract. Cooling of 8.9-GeV/c antiprotons in the Recycler Electron Cooler requires a round 4.34-MeV electron beam with a small angular spread propagating through a 20-m long cooling section. To confine the electron beam tightly and to keep its total transverse angles below 0.2 mrad the cooling section is immersed in a solenoidal field of 50-200 G. The field was measured with a compass-based sensor (transversal) and a hall-probe (longitudinal) after installation of the solenoids into the Recycler tunnel. For the field strength of 105 G, the transverse field components were compensated to the level that provided corresponding dipole beam oscillations below 0.1 mrad, which in turn allowed the first cooling of antiprotons in the GeV energy range. This paper discusses the field measurements and compensation scheme including the results of dipole oscillation measurements.

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“…Recent demonstration of electron cooling of 8 GeV antiprotons in the Recycler ring [1] became possible, in part, due to the stable performance of the electron beam generator [2]. The beam is generated in a Van-De-Graaff type electrostatic accelerator, Pelletron [3], which operates in a so-called energy recovery (or recirculation) scheme [4].…”

Section: Introductionmentioning

confidence: 99%

Full Discharges in Fermilab’s Electron Cooler

Prost¹,

Shemyakin²

2006

AIP Conference Proceedings

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Abstract. Fermilab's 4.3 MeV electron cooler is based on an electrostatic accelerator, which generates a DC electron beam in an energy recovery mode. Effective cooling of the antiprotons in the Recycler requires that the beam remains stable for hours. While short beam interruptions do not deteriorate the performance of the Recycler ring, the beam may provoke full discharges in the accelerator, which significantly affect the duty factor of the machine as well as the reliability of various components. Although cooling of 8 GeV antiprotons has been successfully achieved, full discharges still occur in the current setup. The paper describes factors leading to full discharges and ways to prevent them.

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Attainment of a High-Quality Electron Beam for Fermilab’s 4.3 MeV Cooler

Cited by 4 publications

References 8 publications

The Recycler Electron Cooler

The Recycler Electron Cooler

Magnetic Field Measurement and Compensation in the Recycler Electron Cooler

Full Discharges in Fermilab’s Electron Cooler

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