Publications
140 results found
Kurup A, Bonnal P, Daudin B, et al., 2011, An accelerator design tool for the International Design Study for the Neutrino Factory, Pages: 841-843
A tool has been developed to simplify the accelerator design process from the lattice design, through tracking simulations with engineering features, to costing the facility. The aim of this tool is to facilitate going through the design loop efficiently and thus allow engineering features to be included early on in the design process without hindering the development of the lattice design. The tool uses a spreadsheet to store information about the accelerator and can generate MADX input files, G4beamline input files and interfaces with the costing tool developed by CERN. Having one source for the information simplifies going between lattice simulations, tracking simulations and costing calculations and eliminates the possibility of introducing discrepancies in the design. The application of this tool to cost the Neutrino Factory, which is part of the IDS-NF and EUROnu studies for delivering the Reference Design Report, will be presented. Copyright © 2011 by IPAC'11/EPS-AG.
Kurup A, 2011, The COherent Muon to Electron Transition (COMET) experiment, 11th International Workshop on Tau Lepton Physics, Publisher: ELSEVIER SCIENCE BV, Pages: 38-43, ISSN: 0920-5632
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- Citations: 29
Pasternak J, Jenner LJ, Kurup A, et al., 2010, Accelerator and particle physics research for the next generation muon to electron conversion experiment - The PRISM task force, Pages: 3473-3475
The next generation of lepton flavour violation experiments will use high intensity and high quality muon beams. Such beams can be produced by sending a short proton pulse to the pion production target, capturing pions and performing RF phase rotation on the resulting muon beam in an FFAG ring, which was proposed for the PRISM project. A PRISM task force was created to address the accelerator and detector issues that need to be solved in order to realise the PRISM experiment. The parameters of the initial proton beam required and the PRISM experiment are reviewed. Alternative designs of the PRISM FFAG ring are presented and compared with the reference design. The ring injection/extraction system, matching with the solenoid channel and progress on the ring's main hardware systems like RF and kicker magnet are discussed. The progress and future directions of the study are presented in this paper.
Letchford A, Clarke-Gayther MA, Faircloth D, et al., 2010, Status of the RAL front end test stand, IPAC 2010 - 1st International Particle Accelerator Conference, Pages: 642-644
The Front End Test Stand (FETS) under construction at the Rutherford Appleton Laboratory is the UK's contribution to research into the next generation of High Power Proton Accelerators (HPPAs). HPPAs are an essential part of any future Spallation Neutron Source, Neutrino Factory, Muon Collider, Accelerator Driven Sub-critical System, Waste Transmuter etc. FETS will demonstrate a high quality, high intensity, chopped H-minus beam and is a collaboration between RAL, Imperial College and the Universtity of Warwick in the UK and the Universidad del Pais Vasco and ESS-Bilbao in Spain. This paper describes the current status and future plans of FETS.
Chung M, Jansson A, Moretti A, et al., 2010, Beam test of a high pressure cavity for a muon collider, Pages: 3494-3496
To demonstrate the feasibility of a high pressure RF cavity for use in the cooling channel of a muon collider, an experimental setup that utilizes 400-MeV Fermilab linac proton beam has been developed. In this paper, we describe the beam diagnostics and the collimator system for the experiment, and report the initial results of the beam commissioning. The transient response of the cavity to the beam is measured by the electric and magnetic pickup probes, and the beam-gas interaction is monitored by the optical diagnostic system composed of a spectrometer and two PMTs.
Kurup A, 2010, The coherent muon to Electron Transition (COMET) experiment, Pages: 3470-3472
The COherent Muon to Electron Transition (COMET) experiment aims to measure muon to electron conversion with an unprecedented sensitivity of less than 1 in 10 million billion. The COMET experiment was given stage 1 approval by the J-PARC Program Advisory Committee in July 2009 and work is currently underway towards preparing a technical design report for the whole experiment. The need for this sensitivity places several stringent requirements on the beamline, such as, a pulsed proton beam with an extinction level between pulses of 9 orders of magnitude; a 5T superconducting solenoid operating near a high radiation environment; precise momentum selection of a large emittance muon beam and momentum selection and collimation of a large emittance electron beam. This paper will present the current status of the various components of the COMET beamline.
Torun Y, Huang D, Norem J, et al., 2010, Rectangular box cavity tests in magnetic field for muon cooling, Pages: 3795-3797
Muon cooling requires high-gradient normal conducting cavities operating in multi-Tesla magnetic fields for muon beam focusing in an ionization cooling channel. Recent experience with an 805-MHz pillbox cavity at the Fermilab MuCool Test Area has shown a significant drop in accelerating field performance for the case of parallel electric and magnetic fields. It has been suggested that having the magnetic field perpendicular to the electric field should provide magnetic insulation and suppress breakdown. An 805-MHz Cu rectangular box cavity was built for testing with the fields perpendicular. It was mounted on an adjustable support to vary the angle between the rf electric and external magnetic field. We report on the design and initial operation of the rectangular box cavity.
Kurup A, 2010, Muon to electron conversion: how to find an electron in a muon haystack, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 368, Pages: 3645-3655, ISSN: 1364-503X
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- Citations: 1
Letchford AP, Clarke-Gayther MA, Faircloth DC, et al., 2009, Status of the ral front end test stand, Proceedings of the 24th Linear Accelerator Conference, LINAC 2008, Pages: 70-72
High power proton accelerators (HPPAs) with beam powers in the several megawatt range have many applications including drivers for spallation neutron sources, neutrino factories, waste transmuters and tritium production facilities. The UK's commitment to the development of the next generation of HPPAs is demonstrated by a test stand being constructed in collaboration between RAL, Imperial College London, the University of Warwick and the Universidad del Pais Vasco, Bilbao. The aim of the RAL Front End Test Stand is to demonstrate that chopped low energy beams of high quality can be produced and is intended to allow generic experiments exploring a variety of operational conditions. This paper describes the current status of the RAL Front End Test Stand.
Kurup A, 2009, Bent solenoid tuning simulations for the comet beamline, Pages: 226-228
The COMET experiment beamline uses bent superconducting solenoids for the muon transport and the spectrometer used to analyse the decay electrons from stopped muons. The bent solenoid includes not just a solenoid field but also a vertical dipole field. It is therefore important to have the ability to tune the field distribution. However, since the field distribution is mainly determined by the geometry it is difficult to adjust once the solenoids have been constructed. A cost effective method to provide tuning capability of the field distribution of the bent solenoids is proposed and the results of simulations presented.
Cui Y, Cui YG, Palmer R, et al., 2009, Conceptual Design Report for Experimental Search for Lepton Flavor Violating µ− − e− Conversion at Sensitivity of 10−16 with a Slow-Extracted Bunched Proton Beam (COMET)
Apollonio M, Berg JS, Blondel A, et al., 2009, Accelerator design concept for future neutrino facilities, JOURNAL OF INSTRUMENTATION, Vol: 4, ISSN: 1748-0221
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- Citations: 63
Letchford AP, Clarke-Gayther MA, Faircloth DC, et al., 2008, Status of the ral front end test stand, EPAC 2008 - Contributions to the Proceedings, Pages: 3437-3439
High power proton accelerators (HPPAs) with beam powers in the several megawatt range have many applications including drivers for spallation neutron sources, neutrino factories, waste transmuters and tritium production facilities. The UK's commitment to the development of the next generation of HPPAs is demonstrated by a test stand being constructed in collaboration between RAL, Imperial College London, the University of Warwick and the Universidad del Pais Vasco, Bilbao. The aim of the RAL Front End Test Stand is to demonstrate that chopped low energy beams of high quality can be produced and is intended to allow generic experiments exploring a variety of operational conditions. This paper describes the current status of the RAL Front End Test Stand.
Sato A, Aoki M, Araki S, et al., 2008, Six-sector FFAG ring to demonstrate bunch rotation for PRISM, Pages: 3389-3391
An Fixed Field Alternating Gradient (FFAG) ring which consists of six PRISM-FFAG magnets has been constructed at RCNP, Osaka University. The technique of phase rotation to make a mono-energetic beam will be studied by using this ring and alpha particles. Closed orbits have been determined from measurements using the ring, and the results were compared with tracking simulation results.
Arimoto Y, Aoki M, Araki S, et al., 2008, Construction of six-sector FFAG ring for muon phase rotation, Pages: 3524-3526
To demonstrate phase-space rotation technique, a six-cell FFAG ring has been constructed. The FFAG ring consists of full size of scaling-FFAG magnets which have been designed for muon phase rotation ring, and a high gradient rf cavity. For the six-cell experiment, six magnets has been aligned, and beam duct has been designed and installed. In this paper, it will be described about the construction procedure, apparatus, and measurement of magnetic field.
Jolly S, Kurup A, Lee D, et al., 2008, Detailed study of the RF properties of the FETs RFQ COLD model, EPAC 2008 - Contributions to the Proceedings, Pages: 3422-3424
A 324MHz four vane RFQ cold model has been built, as part of the development of a proton driver Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL) in the UK. Previous measurements to determine the electric field profile were made using the bead-pull perturbation method: these measurements have been refined and expanded. New measurements of the electric field profile, Q-value and resonant modes are presented. Measurements of the fundamental frequency and Q-value of the RFQ as a result of modifications to the profile of the end flange inserts are also given. Finally, an experiment is outlined to determine the beam transmission properties of the cold model based on beam transport simulations with the General Particle Tracer package (GPT).
Cheng Y, Savage P, Kurup A, et al., 2007, RFQ cold model RF measurements and waveguide-to-coaxial line transition design for the front-end test stand at RAL, Proceedings of the IEEE Particle Accelerator Conference, Pages: 1655-1657
A 324MHz four vane RFQ cold model has been built, as part of the development of a proton driver front end test stand at the Rutherford Appleton Laboratory (RAL) in the UK. This paper will present the results of RF measurements performed on the cold model, which include analysis of resonant modes, Q-value measurements and electric field profile measurements using a bead-pull perturbation method. These measurements were done before and after brazing of the four vanes and the results were compared to Microwave Studio simulations. Additionally, a tuner has been designed, built and tested and the results will be presented together with the preliminary results of the electromagnetic design of waveguide-to-coaxial line transition structures for the four vane RFQ. ©2007 IEEE.
Letchford A, Faircloth D, Daly A, et al., 2007, Status report on the RAL front end test stand, Proceedings of the IEEE Particle Accelerator Conference, Pages: 1634-1636
High power proton accelerators (HPPAs) with beam powers in the several megawatt range have many applications including drivers for spallation neutron sources [1], neutrino factories [2], waste transmuters and tritium production facilities. The UK's commitment to the development of the next generation of HPPAs is demonstrated by a test stand being constructed in collaboration between RAL, Imperial College London, the University of Warwick and the Universidad del Pais Vasco. The aim of the RAL Front End Test Stand is to demonstrate that chopped low energy beams of high quality can be produced and is intended to allow generic experiments exploring a variety of operational conditions. This paper describes the status of the RAL Front End Test Stand ©2007 IEEE.
Cheng Y, Savage P, Kurup A, et al., 2007, RFQ cold model RF measurements and waveguide-to-coaxial line transition design for the front-end test stand at RAL, IEEE Particle Accelerator Conference, Publisher: IEEE, Pages: 2876-+
Letchford A, Faircloth D, Daly A, et al., 2007, Status report on the RAL Front End Test Stand, IEEE Particle Accelerator Conference, Publisher: IEEE, Pages: 2855-+
JJ Back, G Bellodi, MA Clarke-Gayther, et al., 2006, Progress at the RAL Front End Test Stand, Nuclear Physics B (Proc. Suppl.), NuFACT 05, Pages: 309-311
Kurup A, Letchford A, 2006, Electromagnetic design of a radio frequency quadrupole for the front end test stand at RAL, Pages: 315-317
The goal of the RAL front end test stand is to demonstrate cleanly chopped bunches of a 60mA H- ion beam at 3MeV. The acceleration of the H - ions from 65keV to 3MeV will be done using a radio frequency quadrupole (RFQ) operating at a resonant frequency of 324MHz. The two types of RFQ considered were a 4-vane and a 4-rod. The 4-vane has a higher Q-value but the post-production adjustment is limited. The 4-rod design is easier to manufacture but requires complicated cooling at 324MHz. The results of electromagnetic simulations using CST Microwave Studio are presented for the 4-vane type and 4-rod type RFQ.
A P Letchford, D C Faircloth, M A Clarke-Gayther, et al., 2006, The RAL Front End Test Stand, JaCow - Joint accelerator conference website, EPAC 2006
Aubert B, Barate R, Boutigny D, et al., 2004, Measurements of the branching fractions of charged <i>B</i> decays to <i>K</i><SUP>±</SUP>π<SUP>∓</SUP>π<SUP>±</SUP> final states -: art. no. 092001, PHYSICAL REVIEW D, Vol: 70, ISSN: 1550-7998
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- Citations: 29
Aubert B, Barate R, Boutigny D, et al., 2004, Search for the rare leptonic decay <i>B</i><SUP>+</SUP>→μ<SUP>+</SUP>ν<sub>μ</sub> (vol 92, art no 221803, 2004) -: art. no. 189902, PHYSICAL REVIEW LETTERS, Vol: 93, ISSN: 0031-9007
Aubert B, Barate R, Boutigny D, et al., 2004, Study of high momentum η′ production in <i>B</i>→η<SUP>′</SUP><i>X<sub>s</sub></i> -: art. no. 061801, PHYSICAL REVIEW LETTERS, Vol: 93, ISSN: 0031-9007
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- Citations: 11
Aubert B, Barate R, Boutigny D, et al., 2004, Measurement of branching fractions and charge asymmetries in <i>B</i><SUP>±</SUP>→ρ<SUP>±</SUP>π<SUP>0</SUP> and <i>B</i><SUP>±</SUP>→ρ<SUP>0</SUP>π<SUP>±</SUP> decays, and search for <i>B</i><SUP>0</SUP>→ρ<SUP>0</SUP>π<SUP>0</SUP> -: art. no. 051802, PHYSICAL REVIEW LETTERS, Vol: 93, ISSN: 0031-9007
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- Citations: 230
Aubert B, Barate R, Boutigny D, et al., 2004, Observation of the decay <i>B</i> → <i>J</i>/ψη<i>K</i> and search for <i>X</i>(3872)→<i>J</i>/ψη -: art. no. 041801, PHYSICAL REVIEW LETTERS, Vol: 93, ISSN: 0031-9007
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- Citations: 338
Aubert B, Barate R, Boutigny D, et al., 2004, Branching fraction measurements of <i>B</i>→η<i><sub>c</sub>K</i> decays -: art. no. 011101, PHYSICAL REVIEW D, Vol: 70, ISSN: 1550-7998
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- Citations: 11
Aubert B, Barate R, Boutigny D, et al., 2004, Measurement of time-dependent <i>CP</i> asymmetries and constraints on sin(2β+γ) with partial reconstruction of <i>B</i><SUP>0</SUP>→<i>D</i><SUP>*∓</SUP>π<SUP>±</SUP> decays -: art. no. 251802, PHYSICAL REVIEW LETTERS, Vol: 92, ISSN: 0031-9007
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- Citations: 12
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