Electron Beam Size Measurements in the Fermilab Electron Cooling System

Kroc, Thomas; Burov, A.; Bolshakov, T.; Shemyakin, A.; Seletskiy, Sergei

doi:10.1063/1.2190137

Cited by 2 publications

(2 citation statements)

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“…The BPM data for the differential trajectories (normally for a set of 4 independent correctors and the energy offset) are fitted by variable optical parameters of the focusing elements. So far, our main approach to the envelope initial condition was based on measurements with 11 orifice scrapers located equidistantly in the cooling section [6]. This sort of measurements is sensitive to the beam halo, not the core.…”

Section: Envelope Mismatch Envelope Qualitymentioning

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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Section: Envelope Mismatch Envelope Qualitymentioning

confidence: 99%

Optics of Electron Beam in the Recycler

Burov¹,

Kazakevich²,

Kroc³

et al. 2006

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…However, stable operation at 0.7 A, which corresponds to this regime, has not been achieved, and the gun runs at 0.2 A with both current and angle distributions far from being homogeneous. The only diagnostics available for envelope angle measurements in the cooling section is a set of scrapers [9], and it allows aligning trajectories of outside electrons. While the gun aberrations do not contribute significantly into the angle spread in the beam core, the angles of the boundary particles may be far from a simple linear dependence on the radial offset.…”

Section: Electron Anglesmentioning

confidence: 99%