A5054666942- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Fusion materials and technologies
- Pulsed Power Technology Applications
- Laser-Plasma Interactions and Diagnostics
- Electron and X-Ray Spectroscopy Techniques
- Real-time simulation and control systems
- Rocket and propulsion systems research
- Electrostatic Discharge in Electronics
- Advanced Combustion Engine Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Cyclone Separators and Fluid Dynamics
- Engineering Applied Research
- Space Science and Extraterrestrial Life
Fermi National Accelerator Laboratory
2012-2022
Fermi Research Alliance
2005-2011
Lawrence Berkeley National Laboratory
2002-2007
Fusion Academy
2005
Fusion (United States)
2005
University of California, Berkeley
2002-2004
We report on an experimental demonstration of electron cooling high-energy antiprotons circulating in a storage ring. In our experiments, cooling, well-established method at low energies ($<500\text{ }\text{ }\mathrm{MeV}/\mathrm{\text{nucleon}}$), was carried out new region beam parameters, requiring multi-MeV dc and unusual transport line. this Letter, we present the results longitudinal force measurements compare them with theoretical predictions.
The High Current Experiment at Lawrence Berkeley National Laboratory is part of the U.S. program to explore heavy-ion beam transport a scale representative low-energy end an induction linac driver for fusion energy production. primary mission this experiment investigate aperture fill factors acceptable space-charge-dominated beams high intensity (line charge density $\ensuremath{\sim}0.2\text{ }\text{ }\ensuremath{\mu}\mathrm{C}/\mathrm{m}$) over long pulse durations ($4\text{...
Gas desorption and electron emission coefficients were measured for 1 MeV potassium ions incident on stainless steel at grazing angles (between 80\ifmmode^\circ\else\textdegree\fi{} 88\ifmmode^\circ\else\textdegree\fi{} from normal incidence) using a new gas-electron source diagnostic (GESD). Issues addressed in design commissioning of the GESD include effects backscattering surface, space-charge limited current, reproducibility measurements. We find that ${\ensuremath{\gamma}}_{e}$ scale as...
During heavy-ion operation in several particle accelerators worldwide, dynamic pressure rises of orders magnitude were triggered by lost beam ions that bombarded the vacuum chamber walls. This ion-induced molecular desorption, observed at CERN, GSI, and BNL, can seriously limit ion lifetime intensity accelerator. From dedicated test stand experiments we have discovered heavy-ion-induced gas desorption scales with electronic energy loss ($d{E}_{e}/dx$) slowing down matter; but it varies only...
Significant experimental and theoretical progress has been made in the U.S. heavy ion fusion program on high-current sources, injectors, transport, final focusing, chambers targets for high energy density physics (HEDP) inertial (IFE) driven by induction linac accelerators. One focus of present research is beam associated with quadrupole focusing intense, space-charge dominated heavy-ion beams, including gas electron cloud effects at currents, study long-distance-propagation such as...
The U.S. Heavy Ion Fusion program has recently commissioned several new experiments. In the High Current Experiment [P. A. Seidl et al., Laser Part. Beams 20, 435 (2003)], a single low-energy beam with driver-scale charge-per-unit-length and space-charge potential is being used to study limits transportable current posed by nonlinear fields secondary atoms, ions, electrons. Neutralized Transport similarly employs perveance final focus of high beams neutralization for transport in target...
The Project X Injector Experiment (PXIE), a test bed for the front end, will be completed at Fermilab FY12-16. One of challenging goals PXIE is demonstration capability to form 1 mA H- beam with an arbitrary selected bunch pattern from initially 5 162.5 MHz CW train. selection made in Medium Energy Beam Transport (MEBT) 2.1 MeV by diverting undesired bunches absorber. This paper presents MEBT scheme and describes development its elements, including kickers
High current and low emittance are principal requirements for heavy-ion injection into a linac driver inertial fusion energy. An electrostatic quadrupole injector is capable of providing these high charge density beams. We have modified the existing 2-MV to reduce beam double pulse length. characterize delivered by Current Transport Experiment effects finite rise time extraction voltage in diode on head. demonstrate techniques mitigating aberrations reducing growth injector.
For the High Current Beam Transport Experiment (HCX) at Lawrence Berkeley National Laboratory, an injector is required to deliver up 1.8 MV of 0.6 A K + beam with emittance ≈1 π-mm-mrad. We have successfully operated a 10-cm-diameter surface ionization source together electrostatic quadrupole (ESQ) accelerator meet these requirements. The pulse length ≈4 μs, firing once every 10–15 s. By optimizing extraction diode and ESQ voltages, we obtained output good current density uniformity, except...
The High Current Experiment (HCX) at Lawrence Berkeley National Laboratory is part of the US program to explore heavy-ion beam transport a scale representative low-energy end an induction linac driver for fusion energy production. primary mission this experiment investigate aperture fill factors acceptable space-charge-dominated beams high space-charge intensity (line-charge density /spl sim/ 0.2 mu/C/m) over long pulse durations (>4 mu/s) in alternating gradient electrostatic and magnetic...
The physics interest in a luminosity upgrade of RHIC requires the development cooling-frontier facility. Detailed calculations were made electron cooling stored beams. This has been followed by beam dynamics simulations to establish feasibility creating necessary beam. accelerator will be superconducting Energy Recovery Linac (ERL). An intensive experimental R&D program engages various elements accelerator, as described 24 contributions 2007 PAC.
The determination of plasma methoxyamines is the most informative parameter for diagnosis pheochromocytoma. Very good sensitivity and specificity are necessary this. measurement deconjugated (free plus sulfate-conjugated) metanephrines more useful. Concentrations 10-fold higher than free metanephrine concentrations. methodology generally uses a column purification high performance liquid chromatography with electrochemical detection. We have tested six commercial columns used step. chose...
The High Current Experiment (HCX) is being assembled at Lawrence Berkeley National Laboratory as part of the U.S. program to explore heavy ion beam transport a scale representative low-energy end an induction linac driver for fusion energy production. primary mission this experiment investigate aperture fill factors acceptable space-charge dominated beams high intensity (line-charge density ∼ 0.2 μC/m) over long pulse durations (>4 μs). This machine will test issues driver-relevant...
Accelerators for heavy-ion inertial fusion energy (HIF) have an economic incentive to fit beam tubes tightly beams, putting them at risk from electron clouds produced by emission of electrons and gas walls. Theory PIC simulations suggest that the will be radially trapped in /spl ges/1 kV ion-beam potential. We are beginning studies on High-Current Experiment (HCX) with unique capabilities characterize production trapping, effects ion mitigation techniques. measuring flux evolved a target,...
In a low energy beam transport line (LEBT), the emittance growth due to beam's space charge is typically suppressed by way of neutralization from either electrons or ions, which originate ionization background gas. cases where chopped, pattern usually changes throughout beginning pulse, causing Twiss parameters differ significantly their steady state values, which, in turn, may result losses downstream. For modest perveance, there an alternative solution, kept un-neutralized portion LEBT...
A 4.3-MeV electron cooling system [1] has been installed at Fermilab in the Recycler antiproton storage ring and is currently being commissioned. The designed to assist accumulation of 8.9-GeV/c antiprotons for Tevatron collider operations. This paper reports on progress beam commissioning effort as well detailed plans demonstrating antiprotons.
A CW-compatible, pulsed H- superconducting linac is envisaged as a possible path for upgrading Fermilab's injection complex. To validate the concept of front- end such machine, test accelerator (a.k.a. PXIE) under construction. The warm part this comprises 10 mA DC, 30 keV ion source, 2m-long LEBT, 2.1 MeV CW RFQ, and 10-m long MEBT that capable creating large variety bunch structures. paper will report commissioning results partially assembled status RFQ manufacturing, describe development...