J.P. Riunaud

European Organization for Nuclear Research

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R. Cappi

European Organization for Nuclear Research

R. Garoby

European Organization for Nuclear Research

J.Y. Hémery

Direction Générale de l'Armement

J. Boillot

European Organization for Nuclear Research

V. Chohan

University of Washington

K D Metzmacher

European Organization for Nuclear Research

Jonas Gruber

Universidade de São Paulo

F. Pedersen

Copenhagen Business School

D. Dekkers

European Organization for Nuclear Research

H. Koziol

European Organization for Nuclear Research

Cooperative Institutions

European Organization for Nuclear Research

123

Centre National de la Recherche Scientifique

Rutherford Appleton Laboratory

Université Paris Cité

SLAC National Accelerator Laboratory

Institut National de Physique Nucléaire et de Physique des Particules

Université Paris-Sud

Brookhaven National Laboratory

Fermi National Accelerator Laboratory

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Operation-Oriented Computer Controls for the CERN PS Complex

IEEE Transactions on Nuclear Science (1981)

J. Boillot M. Bouthéon D. Dekkers J. P. Delahaye B. Frammery

A new computer control system for the CERN PS is presently under development, with the final aim to operate all the accelerators from a unique control centre. From the start, a team of engineers experienced in machine physics and the actual control process, undertook the definition of guiding operational concepts and special characteristics for control and equipment. This included defining the control room layout, structuring the accelerators into operational subprocess, specifying in detail the interactive programs and participating in the commissioning. Using process variables reservation to prevent usage conflicts, the operation can be carried out from any one of the 5 nondedicated consoles. This involves cycle-to-cycle programming parameters and functions with quick access to ~ 1600 analogue signals from each console. The structured system permits analysis of process degradation and advance warning of breakdowns. Full use is made of the data handling power by means of global commands and stored optimum operating conditions.

Structuring

10.1109/tns.1981.4331656

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Citations (2)

Fast extracted proton beams at low energies in the CPS East Experimental Area

Proceedings Particle Accelerator Conference (2002)

R. Cappi L. Durieu J.Y. Hémery M. Martini J.P. Riunaud

To provide beams with characteristics required by the Energy Amplifier Test, the CERN PS had to deliver new beams, of low kinetic energy (0.6-2.7 GeV), low intensity (0.5-5/spl times/10/sup 9/ p) and short duration (<500 ns) via the existing slow extraction channel, the transfer line currently used for 24 GeV/c beams and a slightly modified secondary line. These beams were delivered without impairing other CPS operations and, despite large operational differences, the other three East Area beam lines could alternatively be supplied with slow extracted beam, for half week periods, thanks to the short setting-up time of a few hours. This paper describes how such beams were produced: by (i) acceleration or deceleration of the injected beam in the CPS, depending on the requested energy, (ii) fast extraction using the usual slow extraction channel, (iii) careful optics adjustments and reduction of multiple scattering in the transfer line. The range of beam characteristics achieved, as well as the limitations encountered are also reported.

Transfer line

Line (geometry)

10.1109/pac.1995.504669

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The CERN PS complex as part of the LHC injector chain

R. Cappi R. Garoby S. Hancock M. Martini N.C. Rasmussen

The delivery of a beam with characteristics appropriate to the filling of the LHC (Large Hadron Collider) proton-proton collider requires that the CERN PS complex provide a beam whose transverse particle density exceeds, by a factor of three, the highest currently attained. The beam dynamics operations and the associated hardware modifications which would be required to achieve this goal are considered. The approach favored involves filling the Proton Synchrotron (PS) with two pulses from the Proton Synchrotron Booster (PSB) and requires and RF quadrupole (RFQ2) as a preinjector for the linac (LINAC2), an increase of the PSB extraction energy and additional RF systems, both in the PSB and PS.< >

Proton Synchrotron

Super Proton Synchrotron

Booster (rocketry)

Bunches

10.1109/pac.1991.164237

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Citations (7)

Status of the antiproton decelerator: AD

Nuclear Physics B - Proceedings Supplements (1997)

S. Baird D. Berlin J. Boillot J. Bosser M. Brouet

Antiproton

10.1016/s0920-5632(97)00297-1

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Citations (6)

Emittance control of the PS esup(+-) beams using a Robinson wiggler

Y. Baconnier R. Cappi J.P. Riunaud H.H. Umstaetter M. P. Level

Wiggler

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PS-XXI, A NEW SYNCHROTRON FOR THE LHC INJECTOR

J.P. Riunaud K. Schindl

The CERN PS is the oldest link in the LHC injector chain. A separate function substitute synchrotron is discussed. It would keep the versatility of the present machine and have a higher extraction energy to relax the tolerance on the microwave instability threshold at injection into the SPS. Its essential property would be an adjustable η variation near the isochronous regime to meet the requirements imposed by bunch compression at ejection. It would also be equipped with all the correction systems of a modern machine.

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The CERN PS east area in the LHC era

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) (2002)

L. Durieu O. Ferrando J.Y. Hémery J.P. Riunaud B. Williams

Experiments planned at the CERN Large Hadron Collider (LHC) will require a well-equipped test area with low momentum (<15 Gev/c) secondary particle beams. These beams will be used to test some of the LHC detectors components (ALICE, ATLAS, CMS, LHC-B). In addition another recently approved experiment (DIRAC) will be installed in the PS East Area. This experiment will require a primary proton beam of 24 GeV/c to test QCD predictions. In this context, the EHNL project (East Hall New Look) has been launched. The major modifications include (i) an extension of the present area with a primary 24 GeV/c beam line, (ii) a new secondary beam line layout with test areas at 3.5, 7, 10 and 15 GeV/c, (iii) an additional irradiation area, (iv) an improved facility for beam sharing between the various users. This paper describes the scope of the project, its new features, the planned facilities and its installation schedule.

10.1109/pac.1997.749601

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Citations (5)

Electron Beam Dynamics in the CERN PS

IEEE Transactions on Nuclear Science (1983)

Y. Baconnier R. Cappi R. Garoby W. Hardt Kurt Hübner

The 28 GeV proton synchrotron (PS) forms part of the chain of LEP injectors with the rôle to accelerate positrons and electrons from 0.6 GeV, the operating energy of the Electron/Positron Accumulator (EPA), to 3.5 GeV, the positron/electron injection energy of CERN's 400 GeV proton synchrotron (SPS) which then accelerates the particles to 20 GeV. The PS used as an electron synchrotron has to supply the SPS with 8 bunches at an intensity of Nb = 8 × 109 particles per bunch. Bunch length and energy spread must be chosen carefully to avoid transverse and longitudinal single-bunch instabilities (turbulence) associated with high peak currents in the SPS. Analysis of the beam dynamics in the combined function lattice of the PS shows that this requirement can be fulfilled if the damning-partition numbers are changed. A Robinson Wiggler is proposed for this purpose and a new additional RF system is needed to produce the required bunch dimensions in longitudinal phase space.

Super Proton Synchrotron

Proton Synchrotron

Bunches

Wiggler

Electron cooling

10.1109/tns.1983.4332900

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Citations (2)

Conversion of the PS complex as LHC proton pre-injector

Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366) (2002)

F. Blas R. Cappi V. Chohan D. Cornuet G. Daems

CERN's Large Hadron Collider (LHC) will be supplied with protons from the injector chain Linac2-PS Booster (PSB)-PS-SPS. The required transverse beam brilliance (intensity/emittance) is almost twice that of current PS beams and the LHC bunch spacing of 25 ns must be impressed on the beam before its transfer to the SPS. The scheme involves new RF harmonics in the PSB and the PS, an increase of the PSB energy, and two-batch filling of the PS. After a successful test of the main ingredients, a project for converting the PS complex was launched in 1994. Major additions are: (i) h=1 RF systems in the PSB, (ii) upgrading of the PSB main magnet supply from 1 to 1.4 GeV operation, (iii) new magnets, septa, power supplies, kicker pulsers for the PSB-PS beam transfer, (iv) 40 and 80 MHz systems in the PS, (v) beam profile measurement devices with improved resolution. A significant part of the effort is being provided by TRIUMF under the Canada-CERN co-operation agreement on the LHC.

Booster (rocketry)

Proton Synchrotron

Beam emittance

10.1109/pac.1997.749899

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Citations (10)

Design study of the antiproton decelerator : AD

S.A. Baird D. Simon J. Bosser J.W.N. Tuyn C. Metzger

Antiproton

Source

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Citations (26)