A5075838387- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Pulsed Power Technology Applications
- Microwave Engineering and Waveguides
- Magnetic confinement fusion research
- Berry genetics and cultivation research
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Laser Design and Applications
- Hydraulic flow and structures
- Hydrology and Sediment Transport Processes
- Advanced Frequency and Time Standards
- Electromagnetic Launch and Propulsion Technology
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Engineering and Material Science Research
- Astronomical Observations and Instrumentation
- Historical Architecture and Urbanism
- Photocathodes and Microchannel Plates
- Underwater Vehicles and Communication Systems
- Magnetic and Electromagnetic Effects
- Electromagnetic Effects on Materials
- Architecture, Design, and Social History
SLAC National Accelerator Laboratory
2002-2024
Ionis Pharmaceuticals (United States)
2022
Stanford Synchrotron Radiation Lightsource
2014
Menlo School
2002-2014
Thales (Australia)
2012
Stanford University
2011
Analog Devices (United States)
2008
Los Alamos National Laboratory
1993-2006
University of Maryland, College Park
2003
Office of Scientific and Technical Information
1998
AJDISK is a 1-D large signal klystron simulator developed at Stanford Linear Accelerator Center. A brief discussion of AJDISK's simulation algorithm given and fully to show how was extended enable sheet beam simulations. The primary requirement for extending disk simulators space charge equation. Therefore, the electric field due an infinitely thin plate (infinitely in direction propagation) rectangular drift tube derived. derivation 2-D equation which split into series rods with varying...
The evolution of the virtual cathode microwave source and its current performance are described. Explosive generator driven oscillators, resonant cavity sources, phase-locking amplifier sources covered. Areas for future development discussed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Now more than ever, the pulsed power field is driven by size, weight, and volume constraints. In both military commercial arenas, there an overwhelming need to provide capability in ever smaller lighter packages. The for higher energy density, reliability, efficiency driving progress field. This paper provides a review of state art various types components such as solid-state switches, capacitors, sources. some cases, familiar switch tubes are being replaced with whole new classes devices....
In this paper, we examine intense space-charge beam physics that is relevant to bunching and extraction in a mildly relativistic klystron amplifier, give numerical examples for 5 kA, 500 keV electron 1.3 GHz structure. Much of the peculiar these types devices results from partitioning energy into kinetic potential parts. Both tenuous-nonrelativistic intense-relativistic beams produce effects different nature those produced by intense, because requirements are either negligible or fixed....
This paper describes the experimental development of a long pulse high current relativistic klystron amplifier (RKA). The desired performance parameters are 1 GW output power and /spl mu/s length with an operating frequency 1.3 GHz. Peak powers approaching 500 MW have been achieved in pulses nominal baseline-to-baseline duration. half width is 0.5 mu/s. These contain energy about 160 J. RF rises linearly concert beam pulse, terminates abruptly just before highest part pulsed voltage curve...
An experimental approach using a high Q, resonant cavity surrounding an oscillating virtual cathode has achieved frequency stabilization, and repeatable narrow-band operation of the microwave source. A cylindrical resonator is used with power being extracted radially through circumferential slot apertures into dominant-mode L-band waveguide. The electron-beam/cavity interaction produces strong feedback between induced field cathode, forcing it to lock mode over large variation in electron...
We examine beam-cavity interaction physics relevant to mildly relativistic, intense-beam klystron amplifiers. This is an interesting but difficult regime of operation, because the combination high beam current and low voltage. The advantage this that it relatively easy access powers (and potentially microwave output powers) at energy. calculate effect extremely loading in input idler cavities. cavity's shunt impedance must match order prevent gap voltages will reflect electrons back...
This article describes “WAMbot,'' an autonomous unmanned ground vehicle and the Team MAGICian solution to 2010 Multi Autonomous Ground-robotic International Challenge (MAGIC). The system architecture, hardware, sensing, planning, navigation, mapping systems, user interface were specifically designed address demands of large-scale distributed reconnaissance surveillance task presented in challenge. resulting was selected as a finalist ultimately placed 4th MAGIC 2010. © 2012 Wiley Periodicals, Inc.
This paper describes the results of an experiment that tests a new high-power microwave amplifier concept uses virtual cathode phenomenon as rather than free-running oscillator. The is surrounded by cavity resonator driven input signal. output from this virtual-cathode frequency locked to signal, and exhibits amplification over at least 10-dB dynamic range.
This paper presents a high-speed display driver system fabricated in standard 0.35 mum CMOS technology that operates from single 3V battery for 3.0-in. QVGA (320 times RGB 240) panel. A new amplifier topology, which provides slew current 100 the quiescent current, is discussed. The DAC architecture uses COM as reference to improve pixel DC accuracy between different panels.
Report of the first workshop to identify approaches and techniques in domain quantum sensing that can be utilized by future High Energy Physics applications further scientific goals Physics.
The SLAC XL5 klystron, which produces 50 MW at 12 GHz, is being used in several high gradient accelerators and test stands. design has been transferred to industry currently modified for ease of assembly cost reduction. Two klystrons the new will be manufactured fully characterized.
Experiments at the microsecond pulse length have demonstrated that virtual-cathode oscillator generates narrowband (0.3% bandwidth) microwave pulses when virtual cathode is surrounded by a resonant cavity and driven an appropriate electron beam. This result significant departure from behavior of free-running where frequency depends on (current density)/sup 1/2/. The long-pulse experimental results are described.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We report the experimental demonstration of a 5th harmonic mm-wave frequency multiplying vacuum electronic device, which uses an over-moded spherical sector output cavity. In this pencil electron beam is helically deflected in transverse deflecting cavity before entering No magnetic field required to focus or guide beam. built and tested proof-of-principle device with 57.12 GHz. The measured peak power was 52.67 W at drive frequency. Power 4th, 6th, 7th harmonics 33.28 dB lower than that harmonic.
The 5045 klystron has been in production and accelerating particles at SLAC National Accelerator Laboratory for over 25 years [1]. Although the design undergone some changes there are still significant opportunities improvement performance. Retrofitting higher efficiencies a more mono-energetic spent beam profile is presented.
High peak and average power free-electron lasers (FELs) in the terahertz region (THz) require small diameter, low-emittance, high voltage electron beams. This paper presents two 1.5-2 MV, 100-200 A, thermionic cathode source approaches for compact megawatt range power, multi-kilowatt repetition rate, THz FELs. The preferred beam generation system includes grading electrodes is quite compared to other standard diode gun approaches. Both provide highly compressed beams at waist having low...
A research approach for obtaining kilojoule microwave pulses of microsecond duration at 1.3 GHz from the relativistic klystron amplifier is described. Achieving requires extending electron beam pulse durations and maximizing extraction efficiency fundamental frequency. An diode has been constructed that delivers peak currents in excess 5 kA with a monotonically increasing current exceeding 1 mu s kinetic energies above 400 keV. Close attention given to minimizing losses diode. Maximum...
Interest is increasing in high-power terahertz (THz) sources of radiation. The terminology fluid, but researchers the field typically refer to frequencies ranging from about 300 GHz 10 THz as In this article, we present a description design considerations for compact, high-average power free-electron laser. At present, radiation generated by variety mechanisms, including laser-based and electron-beam-based sources. We provide short current source technology give background against which...