G. Suberlucq

Rutherford Appleton Laboratory

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R. Bossart

European Organization for Nuclear Research

S. Hutchins

University of Exeter

Walter Wuensch

European Organization for Nuclear Research

J.C. Godot

European Organization for Nuclear Research

Jean‐Pierre Delahaye

European Organization for Nuclear Research

L. Rinolfi

European Organization for Nuclear Research

L. Thorndahl

École Polytechnique Fédérale de Lausanne

G. Carron

European Organization for Nuclear Research

Hans-Heinrich Braun

Paul Scherrer Institute

A. Riche

Tudor Place

Cooperative Institutions

European Organization for Nuclear Research

127

SLAC National Accelerator Laboratory

Centre National de la Recherche Scientifique

Stanford University

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Rutherford Appleton Laboratory

Brookhaven National Laboratory

Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

Institut National de Physique Nucléaire et de Physique des Particules

Fermi National Accelerator Laboratory

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CTF developments and results

pac (1996)

R. Bossart Hans-Heinrich Braun F. Chautard M. Comunian J. P. Delhaye

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Demonstration of two-beam acceleration in CTF II

R. Bossart Hans Heinrich Braun Marco Valentini Ian H Wilson L. Thorndahl

The second phase of the Compact LInear Collider (CLIC) Test Facility (CTF II) at CERN has demonstrated the feasibility of two-beam acceleration at 30 GHz using a high-charge drive beam, running parallel to the main beam, as the RF power source. To date accelerating gradients of 59 MV/m at 30 GHz have been achieved. In CTF II, the two beams are generated by 3 GHz RF photo-injectors and are accelerated in 3 GHz linacs, before injection into the 30 GHz modules. The drive beam linac has to accelerate a 16 ns long train of 48 bunches, each with a nominal charge of 13.4 nC. To cope with the very substantial beam-loading special accelerating structures are used (running slightly off the bunch repetition frequency). A magnetic chicane compresses the bunches to less than 5 ps fwhm, this is needed for efficient 30 GHz power generation. The 30 GHz modules are fully-engineered representative sections of CLIC, they include a 30 GHz decelerator for the drive beam, a 30 GHz accelerator for the main beam, high resolution BPM’s and a wire-based active alignment system. The performance achieved so far, as well as the operational experience with the first accelerator of this type, are reported.

Bunches

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Recent developments in production of radioactive ion beams with the selective laser ion source at the on-line isotope separator ISOLDE

Review of Scientific Instruments (2004)

R. Catherall V. N. Fedosseev U. Köster J. Lettry G. Suberlucq

The resonance ionization laser ion source (RILIS) of the ISOLDE on-line isotope separation facility is based on the method of laser stepwise resonance ionization of atoms in a hot metal cavity. The atomic selectivity of the RILIS compliments the mass selection process of the ISOLDE separator magnets to provide beams of a chosen isotope with greatly reduced isobaric contamination. Using a system of dye lasers pumped by copper vapor lasers, ion beams of 22 elements have been generated at ISOLDE with ionization efficiencies in the range of 0.5%–30%. As part of the ongoing RILIS development, recent off-line resonance ionization spectroscopy studies have determined the optimal three-step ionization schemes for yttrium, scandium, and antimony.

Atmospheric-pressure laser ionization

10.1063/1.1691485

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Photocathodes tested in the dc gun of the CERN photoemission laboratory

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (1994)

E. Chevallay J-D. Durand S. Hutchins G. Suberlucq M. Wurgel

Photocathode

Electron gun

10.1016/0168-9002(94)91293-9

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Citations (65)

Demonstration of two-beam acceleration and 30 GHz power production in the CLIC Test Facility

AIP conference proceedings (1999)

R. Bossart Hans-Heinrich Braun G. Carron M. Chanudet F. Chautard

The Compact Linear Collider (CLIC) Test Facility (CTF II) at CERN has recently demonstrated Two-Beam power production and acceleration at 30 GHz. With 41 MW of 30 GHz power produced in 14 ns pulses at a repetition rate of 5 Hz, the main beam has been accelerated by 28 MeV. The 30 GHz RF power is extracted in low impedance decelerating structures from a low-energy, high-current "drive beam" which runs parallel to the main beam. The average current in the drive-beam train is 25 A, while the peak current exceeds 2 kA. Crosschecks between measured drive-beam charge, 30 GHz power and main-beam energy gain are in good agreement. In this paper, some relevant experimental and technical issues on drive-beam generation, two-beam power production and acceleration are presented.

10.1063/1.59015

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The CLIC study of a multi-TeV e/sup ±/ linear collider

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) (2003)

Jean‐Pierre Delahaye R. Bossart H. Braun G. Carron W. Coosemans

The progress of the Compact Linear Collider (CLIC) study of a multi-TeV (0.5-5 TeV) high-luminosity (5/spl times/10/sup 33/ to 1.5/spl times/10/sup 35/ cm/sup -2/ sec/sup -1/) e/sup /spl plusmn// linear collider based on Two-Beam Acceleration (TEA) is presented. The length and, in consequence, the cost of the overall complex is reduced by the use of high accelerating fields (150 MV/m), which are generated by specially damped 30 GHz normal-conducting accelerating structures. The large amount of RF power (400 MW/m) required to generate these high fields is provided by a novel RF power generating scheme which is potentially both cost and power efficient. After summarising the progress made in the developments of 30 GHz components and the performance obtained in the present phase of the CLIC Test Facility (CTF2), the design of a new test facility (CTF3), which will demonstrate the feasibility of the RF power generating scheme, is described.

10.1109/pac.1999.795676

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Citations (2)

TECHNOLOGICAL CHALLENGES FOR HIGH-BRIGHTNESS PHOTO-INJECTORS

G. Suberlucq

Many applications, from linear colliders to freeelectron lasers, passing through light sources and many other electron sources, require high brightness electron beams, usually produced by photo-injectors. Because certain parameters of these applications differ by several orders of magnitude, various solutions were implemented for the design and construction of the three main parts of the photo-injectors: lasers, photocathodes and guns. This paper summarizes the different requirements, how they lead to technological challenges and how R&D programs try to overcome these challenges. Some examples of state-of-the-art parts are presented. HIGH BRIGHTNESS The brightness is a practical measure of the ability of a beam to be focused in all dimensions. A common definition is given by:   ⋅ e ⋅ e ⋅ = 2 2 ny nx n rad m A I 2 B

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A diode-pumped laser system for the photo-injector of an accelerator

M. Divall Emma Springate Graeme Hirst I. N. Ross G. Suberlucq

In this paper, we present the design of a laser system for the CTF3 test facility for the Compact Linear Collider at CERN. The accelerator requires high repeatability of the charge per electron bunch, meaning that the energy stability of the laser system must be better than 0.25%. The laser will produce 1.5 /spl mu/s flat- top pulse trains of /spl sim/2300 micro-pulses, with 15 kW average power in the pulse train at the fundamental wavelength of 1047 nm. This will he achieved by amplifying a CW pulse train in a pulsed diode-pumped Nd:YLF amplifier. Our amplifier is designed to run in steady-state, in a configuration producing flat-top pulses with energy stability better than 1% which will then be feedback stabilised.

10.1109/cleoe.2005.1567834

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CLIC Test Facility developments and results

Proceedings Particle Accelerator Conference (2002)

R. Bossart Hans-Heinrich Braun F. Chautard M. Comunian J P Delahaye

The objectives of the CLIC Test Facility (CTF) are to study the generation of short intense electron bunches using a laser driven photocathode in an RF gun, to generate 30 GHz RF power for high gradient tests of prototype CLIC components, and to test beam position monitors. The performance of the CTF has improved dramatically in the course of the past year and highlights are presented.

Photocathode

Electron gun

Bunches

10.1109/pac.1995.504769

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Citations (4)

OTR FROM NON-RELATIVISTIC ELECTRONS

C. Bal T. Lefèvre G. Suberlucq E. Bravin E. Chevallay

Abstract 2 OTR EMISSION FROM NON RELATIVISTIC ELECTRONS The CLIC Test Facility 3 (CTF3) injector will provide pulsed beams of high average current; 5A over 1.56μs at 140keV. For transverse beam sizes of the order of 1mm, as foreseen, this implies serious damage to the commonly used scintillating screens. Optical Transition Radiation from thermally resistant radiators represents a possible alternative. In this context, the backward OTR radiation emitted from an aluminium screen by a 80keV, 60nC, 4ns electron pulse has been investigated. The experimental results are in good agreement with the theoretical expectations, indicating a feeble light intensity distributed over a large solid angle. Our conclusions for the design of the CTF3 injector profile monitor are also given. We consider the transition between the vacuum and a material with a relative permittivity e. The screen is tilted with respect to the beam trajectory ( z ) by an angle ψ, as shown in figure 1. The OTR emission results from the contribution of the direct ( n ), the reflected ( ' n ) and the refracted ( ' n' r ) radiations emitted by the particle. Using the formalism developed by Wartski in [6], the backward OTR spectral and angular distribution emitted with polarizations parallel and perpendicular to the observation plane can be expressed by:

Transition radiation

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Citations (4)