A5044154002- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Pulsed Power Technology Applications
- Dark Matter and Cosmic Phenomena
- Acoustic Wave Resonator Technologies
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Microwave Engineering and Waveguides
- Microwave and Dielectric Measurement Techniques
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Electrostatic Discharge in Electronics
- Electromagnetic Simulation and Numerical Methods
- Laser Design and Applications
- Muon and positron interactions and applications
- Plasma Diagnostics and Applications
- Computational Physics and Python Applications
- Induction Heating and Inverter Technology
- Advanced Electrical Measurement Techniques
- Photocathodes and Microchannel Plates
- Radiation Effects and Dosimetry
- Quantum Information and Cryptography
- Wireless Power Transfer Systems
Whitney Museum of American Art
2009-2022
Yale University
2009-2021
Columbia University
2002-2010
Argonne National Laboratory
2010
Kharkiv Institute of Physics and Technology
2009-2010
University of New Haven
2009-2010
Fermi Research Alliance
2009
Scientific Research Institute of Optoelectronic Instrumentation
2009
Denka (Japan)
2009
Brookhaven National Laboratory
2009
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
Experimental results are reported for test beam acceleration and deflection in a two-channel, cm-scale, rectangular dielectric-lined wakefield accelerator structure energized by 14-MeV drive beam. The dominant waveguide mode of the is at $\ensuremath{\sim}30\text{ }\text{ }\mathrm{GHz}$, configured to exhibit high transformer ratio ($\ensuremath{\sim}12\ensuremath{\mathbin:}1$). Accelerated bunches narrow secondary channel continuously via Cherenkov radiation that emitted bunch moving wider...
Fast phase shifters are described that use a novel barium strontium titanate ceramic can rapidly change its dielectric constant as an external bias voltage is changed. These promise to reduce by $\ensuremath{\sim}10$ times the power requirements for rf source needed drive energy recovery linac (ERL). Such will be coupled with superconducting radiofrequency cavities so tune them compensate instabilities, whether beam-driven or those caused microphonics. The most promising design presented,...
Energy consumption is a major concern for future large-scale high-energy accelerator projects such as the compact linear collider (CLIC), circular (FCC), and international (ILC). Thus, efficient generation of microwave power recently gained new attention by community. In response, we propose an innovative two-stage multibeam klystron (TS-MBK) concept. It combines very high RF efficiency (84%) with cost effective electro-mechanical configuration. This article presents concept design study...
The efficient generation of microwave power has recently gained broad attention in the accelerator community because energy consumption is one major concerns for future large-scale high-energy projects. For first time, we present a concept two-stage multibeam klystron with annular beams (TS MABK). It allows remarkably high RF production efficiency (90%), using compact design and delivering cost-effective electro-mechanical solution. 1-GHz, 20-MW klystron. performance tube validated...
We report the development of a nondestructive technique to measure bunch rms length in psec range and below, eventually fsec range, by measuring high-frequency spectrum wakefield radiation which is caused passage relativistic electron through channel surrounded dielectric. demonstrate numerically that generated determined length, while specific axial longitudinal charge distribution not important. Measurement millimeter-wave will determine range. This has been done using series calibrated...
A design is presented for a two‐channel 30‐GHz rectangular dielectric wake field accelerator structure being built experimental tests at Argonne National Laboratory (ANL). This allows transformer ratio T much greater than two, and permits continuous coupling of energy from drive bunches to accelerated bunches. It consists three planar slabs cordierite ceramic (ε = 4.7) supported within copper block, forming channel 12 mm×6 mm, an 2 mm. When driven by 50 nC, 14 MeV single bunch available ANL,...
We report results from an experiment that demonstrates the successful superposition of wakefields excited by 50 MeV bunches which travel $\ensuremath{\sim}50\text{ }\text{ }\mathrm{cm}$ along axis a cylindrical waveguide is lined with alumina. The are prepared splitting single laser pulse prior to focusing it onto cathode rf gun into two pulses and inserting optical delay in path one them. Wakefields short (5--6 psec) 0.15--0.35 nC superimposed energy loss each bunch measured as separation...
A high efficiency, power magnicon at 34.272 GHz has been designed and built as a microwave source to develop RF technology for future multi-TeV electron-positron linear collider. To this technology, new is being perfected necessary tests of accelerating structures, pulse compressors, components, determine limits breakdown metal fatigue. date the produced peak output 17 MW with gain 47 dB repetition rate up 5 Hz.
The influence of symmetry‐breaking for a coaxial dielectric structure or its associated drive bunch on stability in wake field accelerator is investigated. Studies have been carried out 18.8 GHz with alumina tubes, and 1 THz diamond tubes.
Energy consumption is one of the major concerns when planning large-scale high energy accelerator projects such as future circular collider (FCC) and similar accelerators. To address this problem, we will describe concept simulations a 1.4 MW, 800 MHz two-stage multibeam klystron (TS MBK) having efficiency (~80%) compact design.
Initial test results of an L-band multi-beam klystron with parameters relevant for ILC are presented. The chief distinction this tube from MBKs already developed is its low operating voltage 60 kV, a virtue that implies considerable technological simplifications in the accelerator complex. To demonstrate concept underlying tubes design, six-beamlet quadrant (a 54 inch high one-quarter portion full 1.3 GHz tube) was built and recently underwent initial tests, main goals demonstrating rated...
Two high power, frequency magnicons have recently been developed by Omega‐P, Inc. The first tube, a frequency‐doubling amplifier at 11.424 GHz, was designed and built in collaboration with the Naval Research Laboratory (NRL), to be prototype of an alternative klystron for Next Linear Collider (NLC); its current use is furnish RF power tests components, active pulse compressors, accelerating structures. tube produce ∼60 MW, ∼1.2 μsec pulses 58% efficiency 59 dB gain using 470 kV, 220 A,...
A high efficiency, power magnicon at 34.272 GHz has been designed and built as a microwave source to develop RF technology for future multi-TeV electron-positron linear collider. To this technology, new is being perfected necessary tests of accelerating structures, pulse compressors, components, determine limits breakdown metal fatigue. date the produced peak output 17 MW with gain 47 dB repetition rate up 5 Hz.
We study, using computational methods based on analytic theory as well a PIC code, the wakefields set up in seven‐zone symmetric rectangular THZ structure, and find that for overall transverse x/y dimensions 2.121 mm×0.6 mm, two 5‐GeV drive bunches (3 nC, with x/y/z 0.3/0.3/0.12 mm3 available at SLAC) will an axial wakefield ∼350 MV/m witness channel, transformer ratio ∼18–20. The symmetry of structure ensures not only small forces are imposed bunch, but also components force equal opposite...
Three concepts of an rf gun to be operated at 0.1–10 mm wavelengths are considered. In all the concepts, system exploits accelerating traveling wave. comparison with a classical decimeter standing–wave gun, we analyze advantages new available sources, and achievable beam parameters.
New results of experimental tests the Yale/Omega-P Ka-band magnicon are presented. The main goal is to achieve stable and repeatable operation necessary for a high-power accelerator test facility. In order direct beam along tube axis, steering coils were installed between gun RF system, thereby allowing an increase in pulse width achievement good stability repeatability output signal. facility briefly described.
Measurements are reported for a one‐third version of high‐power L‐band ferroelectric phase shifter. This shifter is designed to allow rapid adjustments cavity coupling in an accelerator where RF source fluctuations, microphonics, or other uncontrolled fluctuations could cause undesired emittance growth. Experimental measurements shift vs externally‐applied voltage, insertion loss, and switching speed presented. An average rate less than 0.5 ns each degree has been measured.
Exact numerical solutions for the single particle equations of motion have revealed conditions highly nonlinear rapid acceleration near cyclotron resonance electrons injected into a ${\mathrm{TE}}_{111}$-rotating-mode cylindrical microwave cavity immersed in uniform axial magnetic field. We dub this eCRA interaction. Magnitudes energy are shown to exceed large degree limits related autoresonance (CARA) interaction, wherein is sustained traveling rotating ${\mathrm{TE}}_{11}$-mode waves...
LACARA (laser cyclotron auto‐resonance accelerator) is a vacuum laser accelerator of electrons that under construction at the Accelerator Test Facility (ATF), Brookhaven National Laboratory. It expected experiment will be assembled by September 2006; this paper presents progress towards goal. According to numerical studies, as an electron bunch moves along solenoidal magnetic field (∼5.2 T, length ∼1 m), it accelerated from 50 ∼75 MeV interacting with 0.8 TW Gaussian‐mode circularly...
Fast, electrically-controlled ferroelectric RF switches and phase shifters are under development by Omega-P, Inc. for different accelerator applications in the X-, Ka- L-bands. The exact design of such a devise depends on electrical parameters particular material to be used, namely its dielectric constant, loss tangent tunability. values these were unknown frequency domains large rings low that is planned used. New methods developed order measure determine if behavior bulk samples same as...
To address RF source inefficiency, we present a design of an L-band multi-beam klystron with new type depressed collector. It comprises grounded element, magnetic lens, and electrode held at negative potential. This collector allows recovery larger portion energy in the spent electron beams than could conventional collector, will increase tube efficiency towards 80 % single stage.