J.H.B. Madsen

European Organization for Nuclear Research

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Co-Authors

A. Riche

Tudor Place

Jean‐Pierre Delahaye

European Organization for Nuclear Research

L. Rinolfi

European Organization for Nuclear Research

R. Bossart

European Organization for Nuclear Research

Kurt Hübner

European Organization for Nuclear Research

J.C. Godot

European Organization for Nuclear Research

Hartmut Kugler

Bibliothèque Nationale de France

S. Battisti

Scuola Normale Superiore

Walter Wuensch

European Organization for Nuclear Research

A. Krusche

Zentrum für Innovation und Technik in Nordrhein-Westfalen

Cooperative Institutions

European Organization for Nuclear Research

SLAC National Accelerator Laboratory

Cornell University

Centre National de la Recherche Scientifique

Stanford Synchrotron Radiation Lightsource

Stanford University

Lawrence Berkeley National Laboratory

Vifor Pharma (Switzerland)

Rutherford Appleton Laboratory

University of California, Berkeley

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The Process Control Computer at the CERN Proton Synchrotron: Its Application in the Operation of a Fast Ejected Beam

IEEE Transactions on Nuclear Science (1969)

H. van der Beken Donald R. Machen J.H.B. Madsen Ch. Serre

An IBM 1800 has been installed at CERN to assist and improve operation of the Proton Synchrotron (CPS). This paper describes the three main tasks performed in the operation of ejected beams: logging of ejection parameters, monitoring of the beam transport currents and optimization of the ejected beam position on the external target. An account is also given of the hardware installed, the main features of the software and the operational facilities offered.

Super Proton Synchrotron

Proton Synchrotron

IBM

10.1109/tns.1969.4325385

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Citations (3)

CTF developments and results

pac (1996)

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

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Citations (5)

First Experience with the LEP Pre-Injector (LPI) by the LPI Beam Commissioning Team

IEEE Particle Accelerator Conference (1987)

J.H.B. Madsen S. Battisti D. Blechschmidt J.C. Bourdon Paul Brunet

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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)

The Computer Assisted Control and Data Acquisition System for the CERN PS Booster

IEEE Transactions on Nuclear Science (1971)

E. Asséo G. Baribaud H. van der Beken J. Bosser J.H.B. Madsen

The four-ring 800 MeV CERN PS Booster (PSB), whose running-in is scheduled for spring 1972, is to provide 1013 protons per pulse with a high phase space density. The control and data acquisition of the four PSB rings are largely independent of each other, although their operation is to be synchronized with the 50 MeV linac (which serves as an injector) and the CPS (into which the PSB beam is transferred). Many of the control and measurement tasks will be performed with the aid of a computer which is shared with the linac and the CPS. The selection of a central computer operating with the Multiprogramming Operating Executive System (MPX) was made as an optimum compromise between efficiency and economy (e.g. sharing of existing facilities). A large number of analog functions will be generated via a small digital computer, connected to the main computer. This system is discussed in detail and the application programs listed.

Booster (rocketry)

Computer multitasking

10.1109/tns.1971.4326055

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Citations (1)

Progress report on the LEP Pre-injector

S. Battisti R. Bossart Jean‐Pierre Delahaye Kurt Hübner R. Garoby

The LEP (Large Electron Positron Collider) Pre-injector (LPI) reliably provided positrons and electrons at 500 MeV for the LEP injector chain during the first LEP injection tests. Later, experiments were performed with the LEP Injector Linacs (LIL) to verify the influence of various parameters on the positron current and on the conversion efficiency. Also reported are experiments done with the Electron-Positron Accumulation ring (EPA) operating at 500 MeV, concerning trapping, accumulation, and equilibrium beam parameters. The cutting of eight bunches by a thin electrostatic septum to produce two batches of eight bunches was successfully tested. In addition, first runs with e/sup +/ and e/sup -/ at 600 MeV showed that LPI behaves as expected at this energy.< >

Bunches

10.1109/pac.1989.72934

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Citations (0)

LEP injector linacs 1989

J.H.B. Madsen

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Panel Discussion on Computer Control

IEEE Transactions on Nuclear Science (1971)

K. B. Mallory M. Q. Barton H.S. Butler Thomas Collins Dakota Evans

The panelists made short oral presentations, based on the prepared remarks included below, describing the systems they use and the ways the configurations were determined by the particular requirements at each laboratory. Most of the session was an informal discussion, roughly organized about system configuration, reliability, closed-loop control and software. The session was closed with Madsen's discussion relating computer control to accelerator physics, from his prepared statement.

Statement (logic)

Panel discussion

10.1109/tns.1971.4326051

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Present status and future of the CERN linear collider test facility (CTF)

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

Jean‐Pierre Delahaye J.H.B. Madsen A. Riche L. Rinolfi

Photocathode

Bunches

Electron gun

Picosecond

10.1016/0168-9002(94)91292-0

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Citations (1)

THE PETTEN HIGH FLUX REACTOR

J.H.B. Madsen J. Coehoorn

The details and results of the start-up experiment of the Petten High- flux Reactor are reported. The reactor went critical on Sept. 28. 1960. (J.S.R.)

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