A5032369447- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Magnetic confinement fusion research
- Photocathodes and Microchannel Plates
- Laser-Plasma Interactions and Diagnostics
- Radiation Detection and Scintillator Technologies
- Terahertz technology and applications
- Optical Systems and Laser Technology
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Plasma Diagnostics and Applications
- Radiation Therapy and Dosimetry
- Dark Matter and Cosmic Phenomena
- Pulsed Power Technology Applications
- Nuclear Physics and Applications
- Laser-Matter Interactions and Applications
- Crystallography and Radiation Phenomena
- Spectroscopy and Laser Applications
- Advanced Electron Microscopy Techniques and Applications
- Radiation Effects in Electronics
- Electron and X-Ray Spectroscopy Techniques
Fermi National Accelerator Laboratory
2015-2024
Oak Ridge National Laboratory
2023
Northern Illinois University
2010
Fermi Research Alliance
2006-2007
The Integrable Optics Test Accelerator (IOTA) is a storage ring for advanced beam physics research currently being built and commissioned at Fermilab. It will operate with protons electrons using injectors momenta of 70 150 MeV/c, respectively. program includes the study nonlinear focusing integrable optical lattices based on special magnets electron lenses, dynamics space-charge effects their compensation, stochastic cooling, several other experiments. In this article, we present design...
We report on the experimental generation of a train subpicosecond electron bunches. The bunch is accomplished using beam line capable exchanging coordinates between horizontal and longitudinal degrees freedom. An initial consisting set horizontally separated beamlets converted into bunches temporally with tunable duration separation. experiment reported in this Letter unambiguously demonstrates conversion process its versatility.
In the collider run II, Tevatron operates with 36 high intensity bunches of 980 GeV protons and antiprotons. Particles not captured by rf system pose a threat since they can quench superconducting magnets during acceleration or at beam abort. We describe main mechanisms for origination this uncaptured beam, present measurements its parameters means newly developed diagnostics system. The electron lens is effectively used in II operation to remove keep abort gaps safe level.
An experimental program to demonstrate a novel phase space manipulation in which the horizontal and longitudinal emittances of particle beam are exchanged has been completed at Fermilab A0 Photoinjector. A new beamline, consisting TM110 deflecting mode cavity flanked by two horizontally dispersive doglegs installed. We report on first direct observation transverse emittance exchange.
We experimentally demonstrate the production of narrow-band (δf/f≈20% at f≈0.5 THz) transition radiation with tunable frequency over [0.37, 0.86] THz. The is produced as a train sub-picosecond relativistic electron bunches transits vacuum-aluminum interface an aluminum converter screen. bunch generated via transverse-to-longitudinal phase space exchange technique. also show possible application modulated beams to extend dynamical range popular length diagnostic technique based on spectral...
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A real-time interferometer (RTI) has been developed to monitor the bunch length of an electron beam in accelerator. The RTI employs spatial autocorrelation, reflective optics, and a fast response pyro-detector array obtain autocorrelation trace coherent radiation from thus providing possibility online bunch-length diagnostics. complete system commissioned at A0 photoinjector facility measure sub-mm bunches 13 MeV. Bunch variation (FWHM) between 0.8 ps (∼0.24 mm) 1.5 (∼0.45 measured compared...
One of the goals Fermilab A0 photoinjector is to investigate experimentally transverse longitudinal emittance exchange (EEX) principle. Coherent synchrotron radiation in line could limit performance exchanger at short bunch lengths. In this paper, we present experimental and simulation studies coherent (CSR) photoinjector. We report on time-resolved CSR using a skew-quadrupole technique. also demonstrate advantages running EEX with an energy-chirped beam.
With ever increasing demands for intensities in modern accelerators, the understanding of space-charge effects becomes crucial. Herein are presented measurements optically shaped picosecond-long electron beams a superconducting L-band linac over wide range charges, from 0.2 nC to 3.4 nC. At low shape beam is preserved, while at higher charge densities, modulations on convert energy modulations. Energy profile using spectrometer and time streak camera reveal dynamics longitudinal MeV-scale beams.
The measurement of the longitudinal behavior accelerated particle beams at Fermilab is crucial to optimization and control beam maximizing integrated luminosity for physics experiments. Longitudinal measurements in Tevatron Main Injector synchrotrons are based on analysis signals from resistive wall current monitors. This article describes signal processing performed by a 2 GHz-bandwidth oscilloscope together with computer running LabVIEW program which calculates parameters.
The possibility of using electron-beam phase-space manipulations to support a free-electron laser accelerator design optimization has motivated our research. An ongoing program demonstrating the exchange transverse horizontal and longitudinal emittances at Fermilab A0 photoinjector benefited recently from upgrade several key diagnostics stations. Accurate measurements these properties upstream downstream exchanger beam line are needed. Improvements in screen resolution term reduced impact...
We report direct observations of submicropulse beam centroid shifts (head-tail kicks) correlated with short-range wakefields generated by off-axis electron-beam steering in Tesla-type superconducting rf cavities. The experiments were performed at the Fermilab Accelerator Science and Technology (FAST) Facility using its unique configuration a photocathode gun injecting into two separated nine-cell cavities are series corrector magnets position monitors (BPMs) located before, between, after...
We report the direct observations of submacropulse beam centroid oscillations correlated with higher order modes (HOMs) which were generated by off-axis electron steering in TESLA-type superconducting rf cavities. The experiments performed at Fermilab Accelerator Science and Technology (FAST) facility using its unique configuration a photocathode gun injecting into two separated nine-cell cavities series corrector magnets position monitors (BPMs) located before, between, after them....
The advanced superconducting test accelerator at Fermilab has accelerated electrons to 20 MeV and, separately, the International Linear Collider (ILC) style 8-cavity cryomodule achieved ILC performance milestone of 31.5 MV/m per cavity. When fully completed, will consist a photoinjector, one ILC-type cryomodule, multiple R&D beamlines, and downstream beamline inject 300 into Integrable Optics Test Accelerator (IOTA). We report on results first beam, achievement our gradient specifications,...
Experiments were performed at the Fermilab Accelerator Science and Technology (FAST) facility to elucidate effects of long-range wakefields (LRWs) in TESLA-type superconducting rf cavities. In particular, we investigated higher-order modes (HOMs) generated eight cavities a cryomodule (CM) due off-axis steering with correctors located ~4 m upstream CM. We have observed correlated submacropulse centroid slews few-hundred microns oscillations ~240 kHz BPM data after The entrance energy into CM...
This paper discusses the implementation of abort gap beam intensity monitoring at Tevatron collider Fermilab. There are two somewhat independent monitors which measure synchrotron light emitted by particles in gaps. One system uses a gated Photomultiplier Tube (PMT) to intensity, and other single lens telescope, image intensifier, Charge Injection Device (CID) camera beam.
Synchrotron radiation has been used for many years as a beam diagnostic at electron accelerators. It is not normally associated with proton accelerators the intensity of too weak to make detection practical. However, if one utilizes originating near edge bending magnet, or from short rapidly changing magnetic field serves enhance wavelengths shorter than cutoff wavelength, which more recent high energy such Fermilab's Tevatron, tends be visible light. This paper discusses implementation...
The latest generation of IPMs installed in the Fermilab Main Injector and Recycler incorporate a 1 kG permanent magnet, newly designed high-gain, rad-tolerant preamp, control grid to moderate charge that is allowed arrive on anode pick-up strips. intended select single Booster batch measurement per turn. Initially it being used allow for faster turn-on single, high-intensity cycle either machine. expectation this will extend Micro Channel Plate lifetime, which high-cost consumable system. We...
Ionization profile monitors (IPMs) are widely used in accelerators for non-destructive and fast diagnostics of high energy particle beams. Two such - one vertical horizontal being developed installation the IOTA storage ring at Fermilab. They will be turn-by-turn (microseconds scale) measurements 70 MeV/c proton beam sizes. In this paper we present IPMs design (largely following FNAL Booster which employ no external guiding magnetic fields), their mechanical, vacuum, electric subsystems DAQ,...
Ionization profile monitors (IPMs) are widely used in accelerators for non-destructive and fast diagnostics of high energy particle beams. Two such - one vertical horizontal being developed installation the IOTA storage ring at Fermilab. They will be turn-by-turn (microseconds scale) measurements 70 MeV/c proton beam sizes. In this paper we present IPMs design (largely following FNAL Booster which employ no external guiding magnetic fields), their mechanical, vacuum, electric subsystems DAQ,...
Requirements for the noise in electron beams (NEB) have recently approached Shot-noise level some new applications. The density fluctuations of intense near-infrared (NIR) region are being measured at Fermilab Accelerator Science and Technology (FAST) facility. main goal experiment is to accurately compare model with observations optical transition radiation (OTR) generated by a relativistic beam ($\gamma \approx 63$), transiting an Aluminium metal surface. In addition, evidence longitudinal...