Search

Your search keyword '"laser-wire"' showing total 6 results
Start Over Descriptor "laser-wire"
6 results on '"laser-wire"'

1. Effect of laser energy density on bead characteristics in wire-DED.

Author

Rathor, Sumitkumar, Kant, Ravi, and Singla, Ekta

Subjects
*ENERGY density, *MILD steel, *STEEL wire
Abstract

Achieving repeatability in part production remains a challenge in laser-wire feed directed energy deposition (LW-DED). It is necessary to understand the laser-wire deposition and bead aspect ratio varying the process conditions to achieve repeatability. Laser energy density is one of the key process parameters that affect the dimensions of the deposit. So, this study discusses the fundamentals of depositing the copper-coated ER70S-6 low carbon steel wire. The laser energy density effects on aspect ratio, overall porosity, microstructure, and microhardness are presented. The bead morphology changes with the change in laser energy density. Single track deposited sample results helped in understanding the melt transition for material deposition and dimensional resolution of the deposited track. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

2. Development of a laser-wire beam profile monitor for PETRA-III and CLIC

Author

Aumeyr, Thomas and Blair, Grahame

Subjects
539.76, laser based beam size monitor, CLIC, laser-wire
Abstract

The Compact Linear Collider (CUC) is a proposed electron-positron collider with a centre- of-mass energy of 0.5 to 5 TeV, optimised for a nominal centre-of-mass energy of 3 TeV, at high luminosities exceeding 1034 cm-2s-J. The high beam charges in the CUC beams make classical techniques for measuring the transverse beam size such as optical transition radiation (OTR) screens or wire scanners very difficult, which necessitates the use of non-invasive beam- size monitors. The laser-wire is a system that meets these requirements; it uses inverse Compton scattering to determine transverse beam-sizes by scanning a laser beam across the electron beam. This thesis describes how such a laser-wire system was installed and operated at PETRA-III at DESY, which uses an automated mirror to scan a Q-switched laser pulse across the electron beam and is developed from the system previously operated at PETRA-II. The measurements of key performance parameters are described and used in determining the emittance of the PETRA-III beam. The thesis includes a detailed investigation of the laser .' system as well as the collision measurements. Furthermore, simulations were carried out to design a similar system for the proposed transfer line of the CUC Drive-Beam and the necessary baseline characteristics of such a system are described.

Published
2013

3. A laser-wire system for the International Linear Collider.

Author

Delerue, Nicolas, Dixit, Sudhir, Gannaway, Fred, Howell, David, Qurshi, Myriam, Blair, Grahame, Boogert, Stewart, Boorman, Gary, Driouichi, Chafik, Deacon, Lawrence, Aryshev, Alexander, Karataev, Pavel, Terunuma, Nobuhiro, Urakawa, Junji, Brachmann, Axel, Frisch, Joe, and Ross, Marc

Subjects
*WIRE, *LASERS, *LINEAR accelerators, *OPTICS, *BEAM emittance (Nuclear physics)
Abstract

A new laser-wire has been installed in the extraction line of the ATF at KEK. It aims at demonstrating that laser-wires can be used to measure micrometre scale beam size. In parallel, studies have been made to specify a laser suitable for the ILC laser-wires. [ABSTRACT FROM AUTHOR]

Published
2007
Full Text
View/download PDF

4. Micron size laser-wire system at the ATF extraction line, recent results and ATF-II upgrade

Author

Aryshev, A., Blair, G.A., Boogert, S.T., Boorman, G., Bosco, A., Corner, L., Deacon, L., Delerue, N., Foster, B., Gannaway, F., Hayano, H., Howell, D., Karataev, P., Nevay, L., Newman, M., Senanayake, R., Terunuma, N., Urakawa, J., and Walczak, R.

Subjects
*PARTICLE accelerators, *NUCLEAR facilities, *LASER beams, *ELECTRON beams, *ELECTRON emission, *NUCLEAR physics
Abstract

Abstract: The KEK Accelerator test facility (ATF) extraction line laser-wire system has been upgraded last year allowing the measurement of micron scale transverse size electron beams. The last measurements using the upgraded system from recent operation at the ATF are presented, demonstrating raw measurements of order RMS. The main component contributions to this measurement are also discussed. [ABSTRACT FROM AUTHOR]

Published
2010
Full Text
View/download PDF

6. Diagnostic de Faisceau par 'Laser-Wire' et Mesure Rapide du Spectre de Luminosite au Collisionneur Lineaire International

Author

Poirier, Freddy, Universite de Londres, DESY, University of London [London], University of London, Pr. Dr. Blair Grahame(g.blair@rhul.ac.uk), and Poirier, Freddy

Subjects
electron, DESY, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], tungstene de plomb, Physics::Instrumentation and Detectors, standard model, diagnostic, lineaire, diagnostique, beamstrahlung, deconvolution, laser-wire, size, bremsstrahlung, detecteur, spectrum, crystal, bhabha, faisceau, lead tungstate, modele standard, dimension, pbwo, threshold scan, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], luminosity, [PHYS.PHYS.PHYS-ATOM-PH] Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], calorimetrie, unfolding, PbWO4, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], luminosite, collisionneur, matrice, matrix, tev scale, linear, ILC, PETRA, Physics::Accelerator Physics, beam, spectre, positron, High Energy Physics::Experiment, precision, collider, calorimetry, small beam
Abstract

The International Linear Collider (ILC), a high precision electron-positron machine with centre of mass energy extending up to the TeV scale, is curently being proposed and designed. With unprecedented small beam size and high intensity the ILC aims at luminosities of the order of $10^(34)$~cm$^(-2)$s$^(-1)$. Careful monitoring of the beam parameters that affect the luminosity will be mandatory if these ambitious goals are to be achieved.One of the key parameters is beam emittance, the optimisation of which requires beam size monitors with micron resolution.With this aim, a non-invasive laser-wire monitor prototype was designed, installed and run at the PETRA ring. Prior to its installation, background simulations and measurements were performed to verify that they would be low enough to allow the laser-wire programme to proceed. A lead-tungstate crystal calorimeter for the laser-wire was commissioned, including a study of temperature dependance, geometrical acceptance and energy response. The first laser-wire measurements of the PETRA positron beam size were then performed. The system, calibration and results are reported here.At the ILC, beam energy spread and beamstrahlung effects modify the luminosity spectrum. Determination of these effects is crucial in order to extract precision physics from threshold scans. In order to provide a run-time diagnostic scheme to address this, a fast luminosity spectrum measurement technique employing forward calorimetry and statistical unfolding was devised, using the Bhabha process at low angles. The scheme is described and first results are presented.

Published
2005

Catalog

Books, media, physical & digital resources
See catalog results