A5055028283- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Laser-Plasma Interactions and Diagnostics
- International Relations in Latin America
- Laser Design and Applications
- Neutrino Physics Research
- Atomic and Molecular Physics
- Global Peace and Security Dynamics
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Nuclear Physics and Applications
- Land Rights and Reforms
- Graphite, nuclear technology, radiation studies
- Photocathodes and Microchannel Plates
- Spatial Neglect and Hemispheric Dysfunction
- Mass Spectrometry Techniques and Applications
- Quantum, superfluid, helium dynamics
- Optical Systems and Laser Technology
- Atomic and Subatomic Physics Research
- Seismic Imaging and Inversion Techniques
- Radiation Therapy and Dosimetry
Fermi National Accelerator Laboratory
2013-2024
Uniformed Services University of the Health Sciences
2023
New York University Press
2019
Columbia University
2019
Seascape Consultants (United Kingdom)
2018
University of Tennessee at Knoxville
2017
National Security Technologies (United States)
2008
Fermi Research Alliance
2002-2007
SLAC National Accelerator Laboratory
2002-2003
Lawrence Berkeley National Laboratory
1988-2003
The nonlinear dynamics of transverse particle oscillations in the Fermilab Tevatron is studied experimentally and compared with prediction. Accurate measurements various phase-space features are obtained. A theoretically expected metastable state accelerator, particles captured on resonance islands, demonstrated experimentally, stability investigated.
This Letter reports on the first demonstration of laser-assisted ${\mathrm{H}}^{\ensuremath{-}}$ charge exchange for microsecond duration beam pulses. Laser-assisted injection is a breakthrough technology that overcomes long-standing limitations associated with traditional method producing high intensity, time structured beams protons in accelerators via use carbon foils injection. The central theme this experiment novel techniques reduce laser power requirement to allow efficiency stripping...
A high precision, computer-controlled adsorption isotherm apparatus has been constructed and used to investigate a variety of physisorbed systems. Suitable for absolute measurements, this features good vapor pressure resolution outstanding temperature stability. The hallmark the apparatus, however, is graphical computer interface, written using popular LABVIEW package, which offers flexibility ease-of-use not achieved in previous automated This article will demonstrate quality data...
The time dependence of magnetic fields in the superconducting magnets Fermilab Tevatron is discussed. A field variation order 1 G at aperture radius observed. Studies on both full-sized dipoles and prototype have been used to elucidate these effects. Explanations based eddy currents coil matrix or flux creep filaments are explored with tests. Measurement results techniques for controlling effect novel laboratory tests latest accelerator operation presented. It shown that small but important...
Laser-assisted stripping is a novel approach to ${\mathrm{H}}^{\ensuremath{-}}$ charge exchange that overcomes long-standing limitations associated with the traditional, foil-based method of producing high-intensity, time-structured beams protons. This paper reports on first successful demonstration laser technique for microsecond duration beams. The experiment represents factor 1000 increase in stripped pulse compared previous proof-of-principle demonstration. central theme implementation...
The coherent nuclear forward scattering of synchrotron radiation from the 9.4-keV level Kr83 has been observed bulk films and monolayer Kr adsorbed on exfoliated graphite.Received 7 October 1994DOI:https://doi.org/10.1103/PhysRevB.51.7909©1995 American Physical Society
Results of modeling with the 3-D STRUCT and MARS 15 codes beam loss localization related radiation effects are presented for slipstacking injection to Fermilab Main Injector. Simulations proton done using multi-turn tracking realistic accelerator apertures, nonlinear fields in magnets time function RF manipulations explain results measurements. The collimation system consists one primary four secondary collimators. It intercepts a power 1.6 kW at scraping rate 5% 5.5E+13 ppp, ring outside...
While the Tevatron is stored at 150 GeV for injection of protons during a colliding beam cycle, sextupole fields in dipoles decay predictable manner. This has been further measured and compared with behavior predicted by theory flux creep superconducting filaments magnet cable. A correction algorithm implemented which automatically adjusts current output function generators two orthogonal circuits. Results implementation are presented. The technique used reduced chromaticity drift while an...
Abstract Increasing the Main Injector beam power above ∼ 1.2 MW requires replacement of 8 GeV Booster by a higher intensity alternative. In this paper, we consider an linac that produces H - for injection into Recycler Ring or Injector. This upgrade will maximize available neutrino production long baseline DUNE experiment to greater than 2.5 and enable next generation frontier experiments. The takes 1 from PIP-II Linac accelerates it 2 in 650 MHz superconducting RF linac, followed pulsed...
The structural properties of argon films adsorbed on graphite at 85 K were investigated as a function coverage using neutron diffraction. This study was prompted by the recent high-resolution heat-capacity measurements Day et al. which uncovered series anomalies near monolayer melting. These features attributed to formation registered, $\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ $R30\ifmmode^\circ\else\textdegree\fi{}$ phase. diffraction presented here shows that this commensurate...
A 115 MeV proton beam has been successfully cooled in the Electron Cooling Ring at Fermilab. Initial experiments have measured longitudinal drag force, transverse damping rate, and equilibrium size. The was by a factor of ~50 momentum spread 5 sec, 3 size 15 sec. Long term losses were consistent with single scattering from residual gas, lifetime ~1000 Using electron temperature Te= 0.8(2) eV, observed cooling agrees well expectations theory.
During the design of Fermilab Main Injector synchrotron it was recognized that aperture limited at beam transfer and extraction points by combination Lambertson magnets reused Ring quadrupoles located between Lambertsons. Increased intensity demands on from antiproton production for collider program, slow spill to meson fixed target high energy neutrino program have led us replace aperture-limiting with newly built same physical length but a larger aperture. The run main quadrupole bus, must...
The Fermilab Booster is being upgraded under the Proton Improvement Plan (PIP) to be capable of providing a proton flux $2.25^{17}$ protons per hour. intensity cycle will remain at present operational $4.3^{12}$ pulse, however beam rate going increased from 7.5 Hz 15 Hz. One biggest challenges maintain loss power while doubling flux. Under PIP, there has been large effort in studies and simulations better understand mechanisms loss. goal reduce it by half correcting controlling dynamics...
Fermilab initiated the accelerator magnet system upgrade project PIP-II for future neutrino experiments. Old ORBUMP pulsed dipoles should be replaced with new, stronger magnets occupying same space as old ones. Four of these connected in series form dogleg type proton beam orbit. The field and 19 kA current pulse length are close to 1 ms. cores were based on a ferrite material. A gap above 0.4 T new completely saturates So, core, 0.127 mm thick laminations low carbon steel inorganic coating...
The time behavior of the sextupole component Tevatron superconducting dipoles under ramping conditions was studied. Large time-dependent corrections are necessary to maintain constant chromaticities in Tevatron. authors discuss implementation and results these terms emittance growth intensity loss during ramp.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>