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71 papers · 2 filters
A Cost-Effective Rapid-Cycling Synchrotron
Sergei Nagaitsev, Valeri Lebedev
The present Fermilab proton Booster is an early example of a rapidly-cycling synchrotron (RCS). Built in the 1960s, it features a design in which the combined-function dipole magne…
Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets
Alex Lumpkin, Maxwell LaBerge, Donald Rule +10
We report initial observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched electrons from laser-driven plasma accelerators (L…
The Role of Magnetic Flux Expulsion to Reach Q0>3x10^10 in SRF Cryomodules
S. Posen, G. Wu, E. Harms +7
When a superconducting radiofrequency cavity is cooled through its critical temperature, ambient magnetic flux can become "frozen in" to the superconductor, resulting in degradatio…
On The Feasibility of a Pulsed 14 TeV c.m.e. Muon Collider in the LHC Tunnel
D. Neuffer, V. Shiltsev
We discuss the technical feasibility, key machine parameters and major challenges of a 14 TeV c.m.e. muon-muon collider in the LHC tunnel. The luminosity of the collider is evaluat…
Beam Phase Space Tomography at FAST Electron Linac at Fermilab
A. Romanov
FAST linear accelerator has been commissioned in 2017. Experimental program of the facility requires high quality beams with well-defined properties. Solenoidal fields at photoinje…
Commissioning and Operation of FAST Electron Linac at Fermilab
A. Romanov, C. Baffes, D. R. Broemmelsiek +17
We report results of the beam commissioning and first operation of the 1.3 GHz superconducting RF electron linear accelerator at Fermilab Accelerator Science and Technology (FAST)…
High Burst Rate Charging System for the Lithium Lens Power Supply
H. Pfeffer, D. Frolov, C. C. Jensen +2
Two pulsed power systems have been upgraded for the g-2 experiment at Fermilab. The Pbar Lithium Lens supply previously ran with a half sine pulsed current of 75 kA peak, 400 us du…
First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment
The MICE Collaboration, D. Adams, D. Adey +133
The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam…
Effect of bunch shape on its TMCI spectrum and threshold with high space charge
V. Balbekov
Transverse mode coupling instability of bunched beam is investigated in the paper at different form of the bunches with space charge included. Equation of transverse motion of the…
Beam Breakup Mitigation by Ion Mobility in Plasma Acceleration
A. Burov, S. Nagaitsev, V. Lebedev
Moderate ion mobility provides a source of damping in the plasma wakefield acceleration, which may serve as an effective remedy against the transverse instability of the trailing b…
The International Committee for Future Accelerators (ICFA): History and the Future
Pushpalatha C. Bhat, Roy Rubinstein
This paper traces the origins of the International Committee for Future Accelerators (ICFA), its structure and mandate, its activities and accomplishments, and its anticipated acti…
The FNAL Booster 2nd Harmonic RF Cavity
R. Madrak, J. Dey, K. Duel +11
A second harmonic RF cavity which uses perpendicularly biased garnet for frequency tuning is currently being constructed for use in the Fermilab Booster. The cavity will operate at…
Experimental Study of Beam Dynamics In The PIP-II MEBT Prototype
A. Shemyakin, J. -P. Carneiro, B. Hanna +6
The Proton Improvement Plan, Stage Two (PIP-II) is a program of upgrades proposed for the Fermilab injection complex, which central part is an 800 MeV, 2 mA CW SRF linac. A prototy…
Simultaneous Switching of Multiple GaN Transistors in a High-Speed Switch
Daniil Frolov, Greg Saewert
A broadband travelling wave kicker operating with 80 MHz repetition rates is required for the new PIP-II accelerator at Fermilab. We present a technique to drive simultaneously fou…
Optical Stochastic Cooling Experiment At The Fermilab IOTA Ring
J. D. Jarvis, V. Lebedev, H. Piekarz +4
Beam cooling enables an increase of peak and average luminosities and significantly expands the discovery potential of colliders; therefore, it is an indispensable component of any…
Overview of Fabrication Techniques and Lessons Learned With Accelerator Vacuum Windows
C. R. Ader, M. W. McGee, L. E. Nobrega +1
Vacuum thin windows have been used in Fermilab's accelerators for decades and typically have been overlooked in terms of their criticality and fragility. Vacuum windows allow beam…
Record High-Gradient SRF Beam Acceleration at Fermilab
Daniel Broemmelsiek, Brian Chase, Dean Edstrom +10
Many modern and future particle accelerators employ high gradient superconducting RF (SRF) to generate beams of high energy, high intensity and high brightness for research in high…
Micro-bunching for generating tunable narrow-band THz radiation at the FAST photoinjector
J. Hyun, P. Piot, T. Sen +1
This paper presents expected THz radiation spectra emitted by micro-bunched electron beams produced using a slit-mask placed within a magnetic chicane in the FAST (Fermilab Acceler…
The Higgs Factory Muon Collider Superconducting Magnets and Their Protection Against Beam Decay Radiation
N. V. Mokhov, V. V. Kashikhin, S. I. Striganov +2
Low-energy medium-luminosity Muon Collider (MC) is being studied as a possible Higgs Factory (HF). Electrons from muon decays will deposit more than 300 kW in superconducting magne…
Submacropulse Electron-Beam Dynamics Correlated With Higher-Order Modes In Tesla-Type Superconducting RF Cavities
A. H. Lumpkin, R. Thurman-Keup, D. Edstrom +6
We report the direct observations of sub-macropulse beam centroid oscillations correlated with higher order modes (HOMs) which were generated by off-axis electron beam steering in…
Micro-Bunched Beam Production at FAST for Narrow Band THz Generation Using a Slit-Mask
J. Hyun, D. Crawford, D. Edstrom +5
We discuss simulations and experiments on creating micro-bunch beams for generating narrow band THz radiation at the Fermilab Accelerator Science and Technology (FAST) facility. Th…
Novel MCP-Based Electron Source Studies
M. Haughey, V. Shiltsev, G. Stancari
Microchannel plates (MCPs) were recently proposed as novel type of cathodes for electron guns, suitable for applications in design of electron lenses. We report results of the firs…
Operation of normal-conducting RF cavities in multi-tesla magnetic fields for muon ionization cooling: a feasibility demonstration
Daniel Bowring, Alexey Kochemirovskiy, Yagmur Torun +21
Ionization cooling is the preferred method for producing bright muon beams. This cooling technique requires the operation of normal conducting, radio-frequency (RF) accelerating ca…
Convective Instabilities of Bunched Beams with Space Charge
Alexey Burov
For a single hadron bunch in a circular accelerator at zero chromaticity, without multi-turn wakes and without electron clouds and other beams, only one transverse collective insta…