A5081930665- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Plasma Diagnostics and Applications
- Radiation Therapy and Dosimetry
- Muon and positron interactions and applications
- Advanced Radiotherapy Techniques
- Photocathodes and Microchannel Plates
- Particle physics theoretical and experimental studies
- Metal and Thin Film Mechanics
- Radiation Detection and Scintillator Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Advancements in Photolithography Techniques
- Ion-surface interactions and analysis
- Atomic and Subatomic Physics Research
- Radiation Effects in Electronics
- Distributed and Parallel Computing Systems
- Electromagnetic Simulation and Numerical Methods
- Advanced Data Storage Technologies
- Semiconductor materials and devices
MedAustron
2019-2024
Linac Coherent Light Source
2004-2014
Menlo School
2004-2014
Stanford University
2004-2013
IMS Nanofabrication (Austria)
2013
Cornell University
2013
SLAC National Accelerator Laboratory
2003-2010
Stanford Synchrotron Radiation Lightsource
2003-2007
Paul Scherrer Institute
2006
Lawrence Berkeley National Laboratory
2001-2003
We provide a detailed description of model and its computational algorithm for the secondary electron emission process. The is based on broad phenomenological fit to data secondary-emission yield emitted-energy spectrum. two sets values parameters by fitting our particular sets, one copper other stainless steel.
Present and future accelerators' performances may be limited by the electron cloud (EC) effect. The EC formation evolution are determined wall-surface properties of accelerator vacuum chamber. We present measurements total secondary yield (SEY) related energy distribution curves electrons as a function incident-electron energy. Particular attention has been paid to emission process due very low-energy primary ($<20\text{ }\text{ }\mathrm{e}\mathrm{V}$). It is shown that SEY approaches unity...
The effect of an artificially enhanced rough surface on the secondary electron yield (SEY) was investigated both theoretically and experimentally. Analytical studies triangular rectangular grooved surfaces show connection between characteristic parameters a given geometry to SEY reduction. strong magnetic field is also discussed. samples have been measured results agree with particle simulations using Monte Carlo approach.
In the framework of <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">euro</i> SIG project and within an international collaboration between CNAO, CERN, INFN, MedAustron, design a novel gantry for hadron therapy based on superconducting magnets downstream scanning system has been undertaken. The choice placing last dipole plays crucial role in overall layout gantry, having direct impact its radius, weight, cost. proposed considers two separate...
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
This report details the present status of Accelerator design for SuperB Project. It is one four separate progress reports that, taken collectively, describe made on Project since publication Conceptual Design Report in 2007 and Proceedings Workshop VI Valencia 2008.
We have applied our simulation code POSINST to evaluate the contribution growth rate of electron cloud instability in proton storage rings. In particular, we present here recent results for main features ring Spallation Neutron Source at Oak Ridge, and updated Proton Storage Ring Los Alamos. A key ingredient model is a detailed description secondary emission process, including refined emitted energy spectrum, three components yield, namely, true secondary, rediffused backscattered components.
The effect of electron conditioning on commercially aluminium alloys 1100 and 6063 were investigated. Contrary to the assumption that conditioning, if performed long enough, can reduce stabilize SEY low values ($\leq 1.3$, value many pure elements), did not go lower than 1.8. In fact, it reincreases with continued exposure dose.
Clouds of low energy electrons in the vacuum beam pipes accelerators positively charged particle beams present a serious limitation for operation at high currents. Furthermore, it is difficult to probe their density over substantial lengths pipe. We have developed novel technique directly measure electron cloud via phase shift induced TE wave transmitted section accelerator and used average 50 m positron ring PEP-II collider Stanford Linear Accelerator Center.
This paper provides an overview of the worldwide first commissioning a gantry beamline with rotator at MedAustron synchrotron-based proton/ion cancer therapy facility in Wiener Neustadt, Austria. The consists high energy beam transfer (HEBT) line and transport system. It transports from synchrotron to gantry-room isocenter. HEBT entrance, which is coupling point between gantry. one modules, thus it integral part beamline. system used match slowly extracted asymmetric beams rotating In this...
An adequate dose of photoelectrons, accelerated by low-intensity proton bunches and hitting the LHC beam screen wall, will substantially reduce secondary emission avoid fast build-up an electron cloud for nominal beam. The conditioning period liner surface can be considerably shortened thanks to electrons, provided heat load stability kept under control; example this may possible using a special beam, including satellite with intensity 15-20% bunch spacing one or two RF wavelengths. Based on...
Electron cloud instabilities in the Los Alamos Proton Storage Ring and those foreseen for Oak Ridge Spallation Neutron Source are examined theoretically, numerically, experimentally.16 MoreReceived 16 October 2002DOI:https://doi.org/10.1103/PhysRevSTAB.6.014203This article is available under terms of Creative Commons Attribution 3.0 License. Further distribution this work must maintain attribution to author(s) published article’s title, journal citation, DOI.
We report modeling results for electron cloud buildup and instability in the International Linear Collider positron damping ring. Updated optics, wiggler magnets, vacuum chamber designs have recently been developed 5 GeV, 3.2-km racetrack layout. An analysis of synchrotron radiation profile around ring has performed, including effects diffuse specular photon scattering on interior surfaces chamber. The provide input to simulations various magnetic field regions modeled densities thus...