Magnetic Field Measurement and Compensation in the Recycler Electron Cooler

Tupikov, V.; Kazakevich, Grigory; Kroc, Thomas; Nagaitsev, Sergei; Prost, L.; Shemyakin, A.; Schmidt, Charles W.; Sutherland, Mary

doi:10.1063/1.2190138

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…On the other hand, dipole magnetic fields created by imperfections in the cooling section magnetic field are significant and typically the main component of the total angle. After installation, the transverse magnetic fields were measured and compensated with dipole correctors to the level where the resulting rms angle was estimated to be ~50 µrad [43]. However, beam trajectories measured several months afterwards indicated much larger values.…”

Section:  mentioning

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:  mentioning

confidence: 99%

The Recycler Electron Cooler

Shemyakin

Prost

2013

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“…Imperfections of the magnetic field in the cooler (static); the last measurements yielded the field r. m. s. angle of 50 µrad [4]. Perturbations from the Main Injector ramps contribute ~ 40 µrad.…”

Section: Electron Anglesmentioning

confidence: 99%

Optics of Electron Beam in the Recycler

Burov¹,

Kazakevich²,

Kroc³

et al. 2006

AIP Conference Proceedings

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Abstract. Electron cooling of 8.9 GeV/c antiprotons in the Recycler ring (Fermilab) requires high current and good quality of the DC electron beam. Electron trajectories of ~0.2 A or higher DC electron beam have to be parallel in the cooling section, within ~ 0.2 mrad, making the beam envelope cylindrical. These requirements yielded a specific scheme of the electron transport from a gun to the cooling section, with electrostatic acceleration and deceleration in the Pelletron. Recuperation of the DC beam limits beam losses at as tiny level as ~0.001%, setting strict requirements on the return electron line to the Pelletron and a collector. To smooth the beam envelope in the cooling section, it has to be linear and known at the transport start. Also, strength of the relevant optic elements has to be measured with good accuracy. Beam-based optic measurements are being carried out and analysed to get this information. They include beam simulations in the Pelletron, differential optic (beam response) measurements and simulation, beam profile measurements with optical transition radiation, envelope measurements and analysis with orifice scrapers. Current results for the first half-year of commissioning are presented. Although electron cooling is already routinely used for pbar stacking, its efficiency is expected to be improved.

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Magnetic Field Measurement and Compensation in the Recycler Electron Cooler

Cited by 2 publications

References 2 publications

The Recycler Electron Cooler

The Recycler Electron Cooler

Optics of Electron Beam in the Recycler

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