Alexey Lyapin
A5003578305- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Advanced X-ray Imaging Techniques
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Advanced Surface Polishing Techniques
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Balance, Gait, and Falls Prevention
- Force Microscopy Techniques and Applications
- Optical Systems and Laser Technology
- Radiation Detection and Scintillator Technologies
- Advanced Optical Sensing Technologies
- Dark Matter and Cosmic Phenomena
- Laser Design and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
- Astronomy and Astrophysical Research
- Microfluidic and Capillary Electrophoresis Applications
- Life Cycle Costing Analysis
Royal Holloway University of London
2011-2018
University College London
2007-2013
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
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...
This report describes the conceptual design of a proposed free electron laser test facility called CLARA that will be major upgrade to existing VELA accelerator at Daresbury Laboratory in UK. able number new schemes have been but require proof principle experiment confirm they perform as predicted. The primary focus on ultra short photon pulse generation which take lasers into whole regime, enabling area science emerge.
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...
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 CERN Linear Electron Accelerator for Research (CLEAR) has now finished its second year of operation, providing a testbed new accelerator technologies and versatile radiation source. Hosting varied experimental program, this beamline provides flexible test facility users both internal external to CERN, as well being an excellent physics training ground. energy can be between 60 220 MeV, bunch length 1 4 ps, charge in the range 10 pC 2 nC, number bunches 200, at repetition rate 0.8 Hz....
Diamond Light source is a third generation synchrotron facility dedicated to producing radiation of outstanding brightness, ranging from infra-red x-rays. The short electron bunches that are accelerated around the storage ring susceptible phenomenon microbunching instabilities when bunch charge exceeds threshold. primary feature microbunch onset bursts in THz range. high frequencies involved emissions make detection and analysis challenging. A 60-90 GHz Schottky Barrier Diode detector was...
The Compact Linear Collider (CLIC) requires beam position monitors (BPMs) with 50 nm spatial resolution for alignment of the line elements in main linac and delivery system. Furthermore, BPMs must be able to make multiple independent measurements within a single 156 ns long bunch train. A prototype cavity BPM CLIC has been manufactured tested on probe at 3rd Test Facility (CTF3) CERN. transverse is determined from electromagnetic resonant modes excited by two cavities pickup, reference...
Wakefields are an important factor in accelerator design, and a real concern when preserving the low beam emittance modern machines. Charge dependent size growth has been observed at Accelerator Test Facility (ATF2), test for future linear collider delivery systems. Part of explanation this is wakefields. In paper we present numerical calculations wakefields produced by several types geometrical discontinuities line as well tracking simulations to estimate induced effects. We also discuss...
The Versatile Electron Linear Accelerator (VELA) facility will provide enabling infrastructures targeted at the development and testing of novel compact accelerator technologies, specifically through partnership with industry aimed addressing applications in medicine, health, security, energy industrial processing. has now been commissioned Daresbury Laboratory is being actively utilised by groups who are able to take advantage variable electron beam parameters available on VELA either...
We investigated a corrugated mm-scale capillary as compact accelerating structure in the driver-witness acceleration scheme, and suggested methodology to measure of witness bunch. The fields produced by driver bunch energy spread with constant inner radius were measured simulated for both on-axis off-axis beam propagation. Our simulations predicted change field capillary. Also, an approximately twofold increase gain on first cycle was expected capillaries These results confirmed experiment,...
The International Linear Collider and other proposed high energy e+ e- machines aim to measure with unprecedented precision Standard Model quantities new, not yet discovered phenomena. One of the main requirements for achieving this goal is a measurement incident beam an uncertainty close 1e-4. This article presents analysis data from prototype spectrometer commissioned in 2006--2007 SLAC's End Station A beamline. was 4-magnet chicane equipped position monitors measuring small changes orbit...
The Compact Linear Collider (CLIC) is an e + /e - collider based on the two-beam acceleration principle, proposed to support precision high-energy physics experiments in energy range 0.5-3 TeV [1]. To achieve a high luminosity of up 6x10 34 cm -2 s -1 , transport and preservation low emittance beam mandatory. A large number great variety diagnostics instruments foreseen verify guarantee required quality. We discuss status developments experimental results accomplished at CLIC Test Facility...
Six UK institutes are engaged in a collaborative R&D programme with CERN aimed at demonstrating key aspects of technology feasibility for the Compact Linear Collider (CLIC). We give an overview and status of: 1) Drive-beam components: quadrupole magnets beam phase feed-forward prototype. 2) Beam instrumentation: stripline cavity position monitors, electro-optical longitudinal bunch profile monitor, laserwire diffraction transition radiation monitors transverse beam-size determination. 3)...