F. Blas

European Organization for Nuclear Research

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R. Garoby

European Organization for Nuclear Research

K D Metzmacher

European Organization for Nuclear Research

H. Schönauer

European Organization for Nuclear Research

M. Thivent

European Organization for Nuclear Research

F. Pedersen

Copenhagen Business School

F. Völker

European Organization for Nuclear Research

K. Schindl

European Organization for Nuclear Research

E. Jensen

European Organization for Nuclear Research

R. Cappi

European Organization for Nuclear Research

V. Chohan

University of Washington

Cooperative Institutions

European Organization for Nuclear Research

Centre National de la Recherche Scientifique

European Spallation Source

Rutherford Appleton Laboratory

Université Paris Cité

Université Paris-Sud

FZI Research Center for Information Technology

Fermi National Accelerator Laboratory

University of Washington

Imperial College London

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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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Acceleration of lead ions in the CERN PS Booster and the CERN PS

Proceedings Particle Accelerator Conference (2002)

F. Blas P Bossard R. Cappi G. Cyvoct R. Garoby

The new CERN Heavy-Ion Accelerating Facility implies besides a new linac also important modifications of existing accelerators. They are imposed by the low speed and the low intensity of the ion beam and, crucially at low energy, by the short lifetime of the partially stripped ions due to charge exchange with the atoms of the residual gas. Once the optimum charge state (Pb/sup 53+/) and energy of the injector (4.2 MeV/u) had been chosen, the operational pulse-to-pulse variability (PPM) of particle species and intensities in the PS and its four-ring Booster (PSB) dictate the main beam parameters.

Booster (rocketry)

Charge exchange

10.1109/pac.1995.504678

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Citations (3)

Design and operational results of a 'one-turn-delay feedback' for beam loading compensation of the CERN PS ferrite cavities

F. Blas R. Garoby

A project was launched to lower the transient-beam-induced voltage by a factor of four, with a one-turn-delay feedback system reducing the equivalent cavity impedance on the first three revolution frequency sidebands around the cavity tune frequency. The design is able to cope with a wide frequency range due to particle acceleration (15% velocity variation) and choice of harmonic number (h=10 to 20). Loop gain is above 0 dB in the vicinity of revolution frequency harmonics over an instantaneous bandwidth of three to four times the 3-dB bandwidth of the original RF system. Fast digital electronics are applied extensively, resulting in a reliable and compact implementation. The various functions are described, closed-loop performance of a cavity is shown, and measurements with beam are presented.< >

Feedback loop

10.1109/pac.1991.164647

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Citations (9)