Slip-stacking Dynamics for High-Power Proton Beams at Fermilab

Eldred, Jeffrey

doi:10.2172/1248219

Cited by 3 publications

(5 citation statements)

References 28 publications

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“…Without going into details of the Booster high intensity operation and interface with other machines in the complex which can be found in Refs. [25][26][27], here we only briefly outline main processes which occur at injection, transition crossing and extraction.…”

Section: Fnal Booster Synchrotronmentioning

confidence: 99%

Studies of Beam Intensity Effects in Fermilab Booster Synchrotron

Eldred,

Lebedev,

Seiya

et al. 2020

Preprint

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Section: Fnal Booster Synchrotronmentioning

confidence: 99%

Studies of Beam Intensity Effects in Fermilab Booster Synchrotron

Eldred,

Lebedev,

Seiya

et al. 2020

Preprint

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“…Along with Main Injector intensity increase, the 1.2 MW beam power will also require an 11% reduction in the Main Injector ramp time from 1.33 s to 1.2 s. The Booster ramp rate will increase from 15 Hz to 20 Hz to facilitate slip-stacking [27] and increase power to the 8 GeV beamline [16][17][18][19][20]. Main Injector upgrades will also include a new set of pulsed quadrupoles for transition crossing as well as a RF power amplifier upgrade (see Section 3.2).…”

Section: 2 Mw Proton Facility With Pip-iimentioning

confidence: 99%

“…The Main Injector crosses transition energy at 19 GeV which causes losses of less than 0.3% of the beam [27,43]. The accumulation of slip-stacked beam in the Main Injector increases the longitudinal emittance roughly be a factor of three and exacerbates transition crossing [5,21].…”

Section: Main Injector Upgradesmentioning

confidence: 99%

“…Currently the Fermilab Booster uses bunch rotation via quadrupole excitation to longitudinally match the Booster beam to the smaller slip-stacking buckets in the Recycler [79,80], an imperfect process which may contribute to slip-stacking losses [27]. The 2nd-harmonic RF cavity being commissioned for the Fermilab Booster could facilitate bunch rotation [81] and during PIP-II less bunch-rotation will be required.…”

Section: Rcs Magnet Ramp and Rf Accelerationmentioning

confidence: 99%

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Rapid-cycling synchrotron for multi-megawatt proton facility at Fermilab

2019

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A: The Fermilab accelerator complex delivers intense high-energy proton beams to a variety of fixed-target scientific programs, including a flagship long-baseline neutrino program. With the advent of the Deep Underground Neutrino Experiment (DUNE) and Long Baseline Neutrino Facility (LBNF) program there is strong motivation for a 2.4 MW beam power upgrade of the Fermilab proton facility. We show the Fermilab proton facility can achieve 2.4 MW with a new rapid-cycling synchrotron (RCS) to replace the Fermilab Booster and we provide a comprehensive technical analysis of the RCS-based facility design. Past design efforts and operational experience at the Fermilab Booster, J-PARC RCS, and Oak Ridge SNS are leveraged to provide strong empirical precedent for the design. We provide a parametric study of slip-stacking accumulation, RCS extraction energy, space-charge limits, beampipe aperture, eddy current heating, injection foil heating, and lattice optics. The 2.4 MW benchmark for the long baseline neutrino program is achieved independently of a previously proposed multi-GeV linac program, but we assess the impact the linac upgrade would have on RCS performance.

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“…The fast instability seems to be severe only during the start-up phase after a shutdown, with significant reduction being observed after beam pipe conditioning during the operation [3]. It does not limit the current operation with slip-stacking up 700 kW of beam power, but may pose a challenge for a future Proton Improvement Plan II (PIP-II) intensity upgrade [4].…”

Section: Fast Instabilitymentioning

confidence: 99%

Fast instability caused by electron cloud in combined function magnets

Antipov

Adamson

Burov

et al. 2017

Phys. Rev. Accel. Beams

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One of the factors which may limit the intensity in the Fermilab Recycler is a fast transverse instability. It develops within a hundred turns and, in certain conditions, may lead to a beam loss. The high rate of the instability suggests that its cause is electron cloud. We studied the phenomena by observing the dynamics of stable and unstable beams, simulating numerically the buildup of the electron cloud, and developed an analytical model of an electron cloud driven instability with the electrons trapped in combined function dipoles. We found that beam motion can be stabilized by a clearing bunch, which confirms the electron cloud nature of the instability. The clearing suggest electron cloud trapping in Recycler combined function magnets. Numerical simulations show that up to 1% of the particles can be trapped by the magnetic field. Since the process of electron cloud buildup is exponential, once trapped this amount of electrons significantly increases the density of the cloud on the next revolution. In a Recycler combined function dipole this multiturn accumulation allows the electron cloud to reach final intensities orders of magnitude greater than in a pure dipole. The estimated resulting instability growth time of about 30 revolutions and the mode frequency of 0.4 MHz are consistent with experimental observations and agree with the simulation in the PEI code. The created instability model allows investigating the beam stability for the future intensity upgrades.

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Slip-stacking Dynamics for High-Power Proton Beams at Fermilab

Cited by 3 publications

References 28 publications

Studies of Beam Intensity Effects in Fermilab Booster Synchrotron

Studies of Beam Intensity Effects in Fermilab Booster Synchrotron

Rapid-cycling synchrotron for multi-megawatt proton facility at Fermilab

Fast instability caused by electron cloud in combined function magnets

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