A5039925443- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Neutrino Physics Research
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Advanced Electrical Measurement Techniques
- High-Energy Particle Collisions Research
- Electrostatic Discharge in Electronics
- Rocket and propulsion systems research
- Sensor Technology and Measurement Systems
- Algorithms and Data Compression
- Spacecraft and Cryogenic Technologies
- Electron and X-Ray Spectroscopy Techniques
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Real-time simulation and control systems
Fermi National Accelerator Laboratory
2002-2024
Lawrence Berkeley National Laboratory
2017
Illinois Institute of Technology
2015
US Forest Service
2014
Sandia National Laboratories
2002
Universities Research Association
2002
Syracuse University
1992
Cornell University
1985
University of California, Berkeley
1978
Indiana University Bloomington
1978
We explain a noise phenomenon seen in microbridge SUPARAMPs terms of phase instability the junction voltage waveform associated with rf‐induced nulls supercurrent. show that same occurs between all steps. Experimental verification is presented.
In the recently commissioned superconducting RF cavity test facility at Fermilab (SCTF), a 325 MHz, {\beta}=0.22 single-spoke resonator (SSR1) has been tested for first time with its input power coupler. Previously, this had CW low power, high Qext coupler; as bare in Vertical Test Stand and then fully dressed SCTF. For tests described here, design coupler ~ 106 was used. Pulsed provided by Toshiba E3740A 2.5 MW klystron.
A capability to provide a large variety of bunch patterns is crucial for the concept Project X serving MW-range beam several experiments simultaneously. This will be realized by Medium Energy Beam Transport's (MEBT) chopping system that divert 80% all bunches initially 5mA, 2.1 MeV CW 162.5 MHz an absorber according pre-programmed bunch-by-bunch selection. Being considered one most challenging components, tested at Injector Experiment (PXIE) facility built Fermilab as prototype front end....
A first electropolished 201-MHz RF cavity for the international Muon Ionization Cooling Experiment (MICE) has been assembled inside a special vacuum vessel and installed at Fermilab’s MuCool Test Area (MTA). The MTA hall have equipped with numerous instrumentation to characterize operation. commissioned run 14 MV/m gradient no external magnetic field; it is also being in presence of fringe field multiTesla superconducting solenoid magnet, condition which modules will be operated MICE cooling...
A 1.7 GHz waveguide Schottky detector system has been designed and built for each of the Fermilab Tevatron recycler accelerators. The is to measure betatron sideband longitudinal signals accelerators at a frequency high enough avoid coherent effects. Two detectors are used machine, one horizontal vertical signals. Each bi-directional providing both proton antiproton This paper describes details design construction as well electronic detector. Sensitivity calculations bandwidth models...
As deep ultra-violet (DUV) wavelength optical systems progress towards higher numerical aperture (NA), at least some of the lens surfaces in system approach almost complete hemispherical shape and some of have very high angle incidence (AOI) requirements. The antireflection (AR) coating designs for such must address intensity apodization due to thickness nonuniformity polarization purity. We present recent results area DUV coatings that highlight these challenges demonstrate production...
Ionization cooling is the preferred method for producing bright muon beams. This technique requires operation of normal conducting, radio-frequency (rf) accelerating cavities within multi-tesla fields dc solenoid magnets. Under these conditions, exhibit increased susceptibility to rf breakdown, which can damage channel components and imposes limits on length transmission efficiency. We report, first time, stable high-vacuum, normal-conducting cavity at gradients $50\text{ }\text{...
Optical correlator notch filters have been installed in the Fermilab Antiproton Debuncher ring. Their main function is improvement of system signal-to-noise ratio without degradation gain and phase parameters. This turn yields faster cooling times that are compatible with more rapid antiproton production cycles proposed for future operation. A brief discussion techniques presented, showing importance filters. In addition, actual hardware implementation performance results presented.< <ETX...
In order to double the integrated luminosity of Tevatron collider in next running period, a 4-8 GHz bunched beam betatron stochastic cooling system has been designed. The horizontal and vertical emittances protons antiprotons will be cooled counteract effects power supply noise, beam-beam interaction, intrabeam scattering. A proton prototype installed tested. addition, measurement results details hardware are reviewed.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In order to double the integrated luminosity of Tevatron collider in next running period, a 4-8-GHz bunched-beam betatron stochastic cooling system has been designed. The horizontal and vertical emittances protons antiprotons will be cooled counteract effects power supply noise, beam-beam interaction, intrabeam scattering. A proton test installed tested. addition measurement results, details hardware calculations are reviewed. Improvements coming from experience with this configuration being...
Received 25 July 2007DOI:https://doi.org/10.1103/PhysRevLett.99.059903©2007 American Physical Society
The principle upon which the operation of direct-reading wattmeters is based has been known for many years. contribution this paper lies in application to a practical operating instrument measurement high power at radio frequencies. Two instruments are described. first useful range frequencies from 500 2000 kilocycles. This contains circuits permit any frequency band with no tuning or other change instrument. second operates region near 50 megacycles. It inherently single-frequency device...
The Warm Front End (WFE) of the Proton Improvement Plan II Injector Test at Fermilab has been constructed to its full length. It includes a 15-mA DC, 30-keV H- ion source, 2 m-long Low Energy Beam Transport (LEBT) with switching dipole magnet, 2.1 MeV CW RFQ, followed by Medium (MEBT) various diagnostics and dump. This report presents commissioning status, focusing on beam measurements in MEBT. In particular, parameters required for injection into Booster (5 mA, 0.55 ms macro-pulse 20 Hz)...
The frequency of MICE cavities is controlled by pneumatic tuners as their operation impervious due to large magnetic fields. mechanical and RF transfer functions the tuner were simulated in ANSYS. first these tuning systems was assembled tested at Fermilab. response function have been measured compared with simulation results. Finally failure different actuators has predict operational limits tuner.
RF Breakdown in strong magnetic fields has a negative impact on cavity performance. The MuCool Test Area at Fermilab unique capabilities that allow us to study the eects of static field operation. We have tested an 805 MHz pillbox-like external up 5 T. Results confirm our basic model breakdown fields. measured maximum achievable surface gradient dependence field. Damage inspection walls revealed observed pattern. present analysis damage distribution and propose hypothesis explain certain...
The TeV Superconducting Linear Accelerator (TESLA) requires a RF input coupler capable of delivering 208 kW 1.3 GWz power to 9-cell niobium cavity. Various electrical, mechanical, and cryogenic constraints present challenges in the design such coupler. Two parallel development programs are progress at Fermilab DESY. TESLA status is reported.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Schottky signals arising from the independent motions of particles in an accelerator are extremely useful for observing properties beam. This paper will outline use at Fermilab. Specific examples longitudinal and transverse detectors be shown as well methods amplifying distributing signals. Various types signal monitoring equipment discussed with some custom built equipment. Measurements emittance, tune other beam parameters shown.