Recycler Electron Cooling Project: Mechanical vibrations in the Pelletron and their effect on the beam

Kazakevich, Grigory; Burov, Alexi; Boffo, C.; Joireman, P.; Saewert, G.; Schmidt, Charles W.; Shemyakin, Alexander

doi:10.2172/15020252

Cited by 6 publications

(9 citation statements)

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“…The FFT of the resulting set showed the MI field contribution to be~30 μrad rms. A similar procedure applied without MI ramps [81] showed that contributions from the Pelletron vibrations (mainly 20, 29.8, and 59.5 Hz lines [82]) and the power grid (60 Hz) accounted together for~20 μrad rms (1D).…”

Section: Coherent Dipole Motionmentioning

confidence: 99%

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Accelerator Physics at the Tevatron Collider

Lebedev¹,

Shiltsev²

2014

Particle Acceleration and Detection

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At the Fermilab Booster, and many other proton facilities, an intense proton beam is accumulated by multi-turn injection of an Hbeam through a stripping foil. The circulating beam scatters off the injection foil and large-angle Coulomb scattering leads to uncontrolled losses concentrated in the first betatron period. We measure the foil scattering loss rate in the Fermilab Booster as a function of LINAC current, number of injection turns, and time on the injection foil. We find that current Booster operation has ~1% foil scattering loss and we make projections for the Proton Improvement Plan II (PIP-II) injector upgrade.Here we present the results from our recent beam measurements and a foil scattering model analyses.

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Section: Coherent Dipole Motionmentioning

confidence: 99%

“…The most accurate way to measure these fluctuations was found to be by analyzing the BPM readings in a high-dispersion region [82,85]. Optical analyses of different frequency components showed measurable energy fluctuations only at frequencies in the 1-6 Hz range.…”

Section: Terminal Voltage Ripplementioning

confidence: 99%

Accelerator Physics at the Tevatron Collider

Lebedev¹,

Shiltsev²

2014

Particle Acceleration and Detection

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“…The FFT of the resulting set showed the MI field contribution to be ~30 µrad rms. A similar procedure applied without MI ramps [40] showed that contributions from the Pelletron vibrations (mainly 20, 29.8, and 59.5 Hz lines [41]) and the power grid (60 Hz) accounted together for ~20 µrad rms (1D). Because the cooling section has good magnetic shielding, external magnetic fields are decreased by a factor of >1000 inside [42] and do not create any measurable perturbations.…”

Section:  mentioning

confidence: 99%

“…Because the typical cooling time is minutes, the effect of fluctuations of the electron energy on the cooling process caused by the terminal voltage ripple at Hzrange frequencies is heavily averaged and equivalent to an increase of the beam energy spread. The most accurate way to measure these fluctuations was found to be by analyzing the BPM readings in a high-dispersion region [41], [44]. Optical analyses of different frequency components showed measurable energy fluctuations only at frequencies in the 1 -6 Hz range.…”

Section: Terminal Voltage Ripplementioning

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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“…An accurate estimation of a possible effect of these oscillations on angles in the cooling section requires tracking specific lines from the spectrum similarly to what was done in Ref. 6. To estimate the order of magnitude, we can assume that the beam sizes at the exit of the acceleration column location and in the proposed BNL cooling section are similar, and, correspondingly, the oscillation amplitudes will be similar as well.…”

Section: Transverse Anglesmentioning

confidence: 99%

Low-energy run of Fermilab Electron cooler's beam generation system

Prost¹,

Shemyakin²,

Fedotov³

et al. 2010

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In the context of the evaluation of possibly using the Fermilab Electron Cooler for the proposed low-energy RHIC run at BNL, operating the cooler at 1.6 MeV electron beam energy was tested in a short beam line configuration. The main conclusion of this feasibility study is that the cooler's beam generation system is suitable for BNL needs. The beam recirculation was stable for all tested parameters. In particular, a beam current of 0.38 A was achieved with the cathode magnetic field up to the maximum value presently available of 250 G. The energy ripple was measured to be 40 eV. A striking difference with running the 4.3 MeV beam (nominal for operation at FNAL) is that no unprovoked beam recirculation interruptions were observed.

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Recycler Electron Cooling Project: Mechanical vibrations in the Pelletron and their effect on the beam

Cited by 6 publications

References 0 publications

Accelerator Physics at the Tevatron Collider

Accelerator Physics at the Tevatron Collider

The Recycler Electron Cooler

Low-energy run of Fermilab Electron cooler's beam generation system

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