A5088657675- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Photonic and Optical Devices
- Electrostatic Discharge in Electronics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Plasma Diagnostics and Applications
- Mechanical and Optical Resonators
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Experimental Learning in Engineering
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Adaptive optics and wavefront sensing
- Optical Systems and Laser Technology
- Advancements in Photolithography Techniques
- Crystallography and Radiation Phenomena
University of Oxford
2007-2022
Science Oxford
2010
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...
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.
A high-resolution, low-latency beam position monitor (BPM) system has been developed for use in particle accelerators and lines that operate with trains of bunches bunch separations as low several tens nanoseconds, such future linear electron-positron colliders free-electron lasers. The was tested electron beams the extraction line Accelerator Test Facility at High Energy Research Organization (KEK) Japan. It consists three stripline BPMs instrumented analogue signal-processing electronics a...
To achieve the design luminosity at future linear colliders, control of beam stability sub-nanometre level interaction point will be necessary. Any source motion which results in relative vertical offsets two beams may significantly reduce from nominal value. Beam-based intra-train feedback systems located region are foreseen to correct beam-beam offset and thus steer into collision. These must capable acting within bunch train. In addition, these might considerably help relax tight...
A high-resolution, intratrain position feedback system has been developed to achieve and maintain collisions at the proposed future electron-positron International Linear Collider (ILC). prototype commissioned tested with a beam in extraction line of Accelerator Test Facility High Energy Research Organization Japan. It consists stripline monitor (BPM) analogue signal-processing electronics, custom digital board perform calculation, kicker driven by high-current amplifier. The closed-loop...
We report the design, operation and performance of a high-resolution, low-latency, bunch-by-bunch feedback system for nano-beam stabilisation. The employs novel, ultra-low quality-factor cavity beam position monitors (BPMs), two-stage analogue signal down-mixing system, digital processing board incorporating an FPGA. FPGA firmware allows real-time integration up to fifteen samples BPM waveforms within measured latency 232 ns. show that this sample improves significantly resolution and,...
We report the results of a low-latency beam phase feed-forward system built to stabilize arrival time relativistic electron beam. The was operated at Compact Linear Collider (CLIC) Test Facility (CTF3) CERN where stabilized approximately 50 fs. latency 350 ns and correction bandwidth >23 MHz. meets requirements for CLIC.
The FONT5 upstream beam-based feedback system at ATF2 is designed to correct the position and angle jitter entrance final-focus system, also demonstrate a prototype intra-train for International Linear Collider interaction point. We discuss hardware, from stripline BPMs kickers, RF digital signal processing, as well presenting results latest beam tests ATF2.
We present results obtained with the T-488 experiment at SLAC Endstation A (ESA). material model of ILC extraction-line design was assembled and installed in ESA. The module includes materials representing mask, beamline calorimeter, first extraction quadrupole, encompassing a stripline interaction-point feedback system beam position monitor (BPM). high-energy electron used to irradiate order mimic electromagnetic (EM) backgrounds expected interaction region. impact upon performance BPM...
The high luminosity requirement for a future linear collider sets demanding limit on the beam quality at Interaction Point (IP). One potential source of loss is motion ground itself. resulting misalignments quadrupole magnets cause distortions to orbit and hence an increase in emittance. This paper describes technique compensating this distortion by using seismometers monitor misalignment real-time. first demonstration was achieved Accelerator Test Facility (ATF) KEK Japan. feed-forward...
Experiment T-488 at SLAC, End station A recorded distorted BPM voltage signals and an accurate simulation of these was performed. Geant simulations provided the energy momentum spectrum incident spray secondary emissions, a method via image charges used to convert particle momenta number density into stripline currents. Good agreement achieved between simulated measured signals. Further experiment with beam on axis impinging thin radiator predicted minimal impact due emission. By extension...
We present the design and preliminary results of a prototype beam-based digital feedback system for Interaction Point International Linear Collider. A custom analogue front-end processor, FPGA-based signal processing board, kicker drive amplifier have been designed, built, tested on extraction line KEK Accelerator Test Facility (ATF). The was measured to latency approximately 140 ns.
During the past years our group has built, calibrated, and finally installed all components of Muon Barrel Alignment System for CMS experiment. This paper covers results hardware commissioning, full system setup connection to Detector Control (DCS). The step-by-step operation is discussed: from collecting analog video signals preprocessing observed LED images, through controlling front-end PCs, forming measurement DCS. first initial experiences communication with DCS are also discussed.
The first version of digital low level RF (DLLRF) for the Diamond Light Source storage ring and booster was developed with ALBA Synchrotron. Six systems have been built so far. Two them are in routine operation controlling two normal conducting HOM-damped cavi-ties ring. A third system is being used cavity testing test facility (RFTF). fourth commissioned to control sec-ond cavity. fifth DLLRF prepared new based on SIS8300-KU RTM has tested last few years. We aiming develop a common platform...