A5064778502- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Biotechnology and Related Fields
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Genetics, Bioinformatics, and Biomedical Research
- Advanced X-ray Imaging Techniques
- Photocathodes and Microchannel Plates
- Magnetic confinement fusion research
- Biomedical Ethics and Regulation
- Science, Research, and Medicine
- Biomedical and Engineering Education
- American Constitutional Law and Politics
- Health and Medical Research Impacts
- Innovation Policy and R&D
- Pulsed Power Technology Applications
- Gene Regulatory Network Analysis
- Scientific Computing and Data Management
- Intellectual Property and Patents
- CRISPR and Genetic Engineering
- Interdisciplinary Research and Collaboration
- Advancements in Photolithography Techniques
- Global Maritime and Colonial Histories
- History and advancements in chemistry
The Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute
2024
SLAC National Accelerator Laboratory
2003-2015
Menlo School
2004-2015
Stanford Synchrotron Radiation Lightsource
1992-2013
Stanford University
1985-2012
Oncolytics Biotech (Canada)
2008-2009
Linac Coherent Light Source
2007
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2006
Fermi National Accelerator Laboratory
2006
Deutsches Elektronen-Synchrotron DESY
2006
Ultrafast electron probes are powerful tools, complementary to x-ray free-electron lasers, used study structural dynamics in material, chemical, and biological sciences. High brightness, relativistic beams with femtosecond pulse duration can resolve details of the dynamic processes on atomic time length scales. SLAC National Accelerator Laboratory recently launched Electron Diffraction (UED) microscopy Initiative aiming at developing next generation ultrafast scattering instruments. As first...
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
For high luminosity in electron-positron linear colliders, it is essential to generate low vertical emittance beams. We report on the smallest achieved single-bunch-mode operation of Accelerator Test Facility, which satisfies requirement x-band collider. The emittances were measured with a laser-wire beam-profile monitor installed damping ring. bunch length and momentum spread beam also recorded under same conditions. rms at intensity 4 pm energy 1.3 GeV, corresponds normalized 1.0x1.0(-8)...
The Accelerator Test Facility 2 (ATF2) is a scaled demonstrator system for final focus beam lines of linear high energy colliders. This paper describes the resolution cavity position monitor (BPM) system, which part ATF2 diagnostics. Two types BPMs are used, C-band operating at 6.423 GHz, and S-band 2.888 GHz with an increased aperture. cavities, electronics, digital processing described. attenuators was determined to be approximately 250 nm 1 m system. Without attenuation best recorded 27 nm.
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.
The authors describe the design, construction, commissioning and ultimate uses of wire scanners in SLC (SLAC Linear Collider), focusing on linear accelerator upstream systems scanners. Of particular interest is interaction between scattered radiation from with extreme electric field beam. As this reaches level several volts/angstrom, as it does easily at point (and may parts SLC), emission occur. A key feature operation degree high active control required to keep optimized. Advanced software...
RF processing studies of 1.8-m X-band (11.4 GHz) traveling wave structures at the Next Linear Collider Test Accelerator (NLCTA) have revealed breakdown-related damage gradients lower than expected from earlier tests with standing and shorter, group velocity structures. To understand this difference, a series different velocities lengths are being processed. In parallel, efforts made to improve procedures reduce structure contaminants absorbed gases. This paper presents results these studies.
We report preliminary results of beam tests the FONT3 Linear Collider intra-train position feedback system prototype at Accelerator Test Facility KEK. The incorporates a novel monitor (BPM) processor with latency below 5 nanoseconds, and kicker driver amplifier similar low latency. 56 nanosecond-long bunchtrain in ATF extraction line was used to test BPM processor. achieved will allow demonstration on timescales relevant even for CLIC design.
We present wakefield measurements of a prototype Next Linear Collider (NLC) accelerator structure that was built with dipole mode damping and detuning to suppress the long-range transverse induced by beam. In addition, we describe beam centering tests use as guide power coupled out for purposes.
A full-scale prototype C-band structure for the e/sup +/e/sup -/ linear collider has been built in which dipole powers are damped to suppress long-range transverse wakefield. To verify that damping works as expected, was tested Accelerator Structure SETup (ASSET) at SLAC. This paper presents results of wakefield measurement with ASSET.
Vibration measurements of the linear accelerator structures in SLC linac show a 1 micron RMS vertical motion. This motion reduces to 0.2 when cooling water is turned off. The quadrupoles have 250 nanometer with structure on and 60 it These results together correlations as function frequency between motions various components are presented.
Experiments at the FLASH linac DESY have demonstrated that higher order modes (HOMs) induced in superconducting cavities can be used to provide a variety of beam and cavity diagnostics. The centres determined from orbit which produces minimum power dipole HOM modes. phase amplitude as high resolution position monitor. For most accelerators, existing couplers necessary signals, downmix digitizing electronics are straightforward, similar those for conventional BPM.
Wire-scanning beam profile monitors are used at the Stanford Linear Collider (SLC) for emittance preservation control and optics optimization. Twenty such scanners have proven most useful this purpose performed a total of 1.5 million scans in 4 to 6 years since their installation. Most essential equipped with 20 40 μm tungsten wires. SLC bunch intensities sizes often exceed 2×107particles/μm2 (3C/m2). We believe that has caused number wire failures appear ends wire, near support points,...
A major upgrade to the SLC final focus was installed in 1994 eliminate dominant third-order aberration of system, and thereby reduce vertical beam size at IP by a factor two. At low current, optimal about 400 nm is now routinely established, its sensitivity orbit variations, changes emittance energy spread, other parameters has been studied. For intensities above 3/spl times/10/sup 10/ particles per bunch, tuning more difficult due increased fluctuations energy, orbit, emittances....