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1999_PAC
13 items
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1.
Electron Cloud and Beam Scrubbing in the LHC ; rev. version / Brüning, Oliver Sim ; Caspers, Friedhelm ; Collins, I R ; Gröbner, Oswald ; Henrist, Bernard ; Hilleret, Noël (CERN) ; Laurent, Jean Michel ; Morvillo, M ; Pivi, M ; Ruggiero, F et al.
An adequate dose of photoelectrons, accelerated by low-intensity proton bunches and hitting the LHC beam screen wall, will substantially reduce secondary emission and avoid the fast build-up of an electron cloud for the nominal LHC beam. The conditioning period of the liner surface can be considerably shortened thanks to secondary electrons, provided heat load and beam stability can be kept under control; for example this may be possible using a special proton beam, including satellite bunches with an intensity of 15-20% of the nominal bunch intensity and a spacing of one or two RF wavelengths [...]
LHC-Project-Report-290; CERN-LHC-Project-Report-290.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 2629 - Please contact the library if you need to access this document.
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2.
A Method to Evaluate the Field-Shape Multipoles Induced by Coil Deformations / Ferracin, P ; Scandale, Walter ; Todesco, Ezio ; Tropea, P
A semi-analytical method to evaluate the effect of coil de-formations on the field-shape imperfections of the LHC dipole is presented. The deformation induced by the collaring procedure and by the thermal stresses is evaluated numerically with a finite element code. [...]
LHC-Project-Report-287; CERN-LHC-Project-Report-287.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 3206 - Please contact the library if you need to access this document.
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3.
Performance of Five and Six Block Coil Geometries in Short Superconducting Dipole Models for the LHC / Andreev, N ; Artoos, K ; Rodríguez-Mateos, F ; Russenschuck, Stephan ; Siegel, N ; Siemko, A ; Sonnemann, F ; Tommasini, D ; Vanenkov, I
A series of similar one meter long superconducting dipole models for the LHC is being manufactured and tested since 1995 for exploring design variants and assembly parameters.Until the end of 1997 all magnets of this series were based on a coil geometry subdividing the conductors in five distinctive winding blocks. In order to cope with new requirements of magnetic field distribution and coil design flexibility, one additional block has been added in the beginning of 1998. [...]
LHC-Project-Report-286; CERN-LHC-Project-Report-286.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 154 - Please contact the library if you need to access this document.
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4.
Field Shape Variation Induced by Thermal Cycling and Excitation in the LHC Dipole / Pagano, O ; Scandale, Walter ; Todesco, Ezio
The field-shape imperfections measured at room temperature before and after thermal cycling and excitation up to maximum field in three 10 m-long models of the LHC dipole are presented. A systematic variation is observed in the normal sextupole and decapole components. [...]
LHC-Project-Report-285; CERN-LHC-Project-Report-285.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 3209 - Please contact the library if you need to access this document.
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5.
Accurate Calculation of Magnetic Fields in the End Regions of Superconducting Accelerator Magnets using the BEM-FEM Coupling Method / Kurz, S ; Russenschuck, Stephan
In this paper a new technique for the accurate calculation of magnetic fields in the end regions of superconducting accelerator magnets is presented. This method couples Boundary Elements (BEM) which discretize the surface of the iron yoke and Finite Elements (FEM) for the modelling of the nonlinear interior of the yoke. [...]
LHC-Project-Report-284; CERN-LHC-Project-Report-284.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.2796-8 - Please contact the library if you need to access this document.
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6.
The Protection System for the Superconducting Elements of the Large Hadron Collider at CERN / Dahlerup-Petersen, K ; Denz, R ; Gómez-Costa, J L ; Hagedorn, Dietrich ; Proudlock, Paul ; Rodríguez-Mateos, F ; Schmidt, R ; Sonnemann, F
The protection system for the superconducting elements of the Large Hadron Collider (LHC) [1] at the European Laboratory for Particle Physics (CERN), and its associated equipment are presented: quench detectors, cold diodes, quench heaters and related power supplies, extraction resistors and associated current breakers. Features such as radiation resistance, redundancy and required reliability are discussed..
LHC-Project-Report-283; CERN-LHC-Project-Report-283.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 3200 - Please contact the library if you need to access this document.
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7.
Beam Vacuum Interconnects for the LHC Cold Arcs / Veness, R J M ; Brunet, J C ; Gröbner, Oswald ; Lepeule, P ; Reymermier, C ; Schneider, G ; Skoczen, Blazej ; Kleimenok, V ; Nikitin, I N
The design of the beam vacuum interconnect is described in this paper. Features include a novel RF bridge design to maximise lateral flexibility during cryostat Cold arcs of the LHC will consist of twin aperture dipole, quadrupole and corrector magnets in cryostats, operating at 1.9 K. [...]
LHC-Project-Report-289; CERN-LHC-Project-Report-289.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.1399-41
18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 1339 - Please contact the library if you need to access this document.
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8.
Optimisation of the Current Ramp for the LHC / Burla, P ; King, Q ; Pett, John G
The field quality of the main magnets in the LHC will be, in part, dependent upon the shape of the magnetic field as a function of time. A theoretical optimisation of this function has been carried-out with the aim of minimising the dynamic errors [3]. [...]
LHC-Project-Report-281; CERN-LHC-Project-Report-281.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 762 - Please contact the library if you need to access this document.
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9.
Update of the LHC Arc Cryostat Systems Layouts and Integration / Brunet, J C ; Cruikshank, P ; Ostojic, R ; Poncet, Alain ; Proudlock, Paul ; Rohmig, P ; Skoczen, Blazej ; Tavian, L
Since the LHC Conceptual Design report's publication in October 1995 [1], and subsequent evolutions [2], the LHC Arc Cryostat System has undergone recently a number of significant changes, dictated by the natural evolution of the project. Most noteworthy are the recent decisions to route the large number of auxiliary circuits feeding the arc corrector magnets in a separate tube placed inside the cryostat with connections to the magnets every half-cell [...]
LHC-Project-Report-280; CERN-LHC-Project-Report-280.- Geneva : CERN, 1999 - 4 p. Access to fulltext document: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.1330-2 - Please contact the library if you need to access this document.
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10.
The LHC Magnet String Programme : Status and Future Plans / Bordry, Frederick ; Casas-Cubillos, J ; Cruikshank, P ; Dahlerup-Petersen, K ; Rodríguez-Mateos, F ; Proudlock, Paul ; Riddone, G ; Saban, R I ; Schmidt, R ; Serio, L et al.
LHC-Project-Report-279; CERN-LHC-Project-Report-279.- Geneva : CERN, 1999 - 4 p. Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 3203 - Please contact the library if you need to access this document.
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11.
Tests Results on the First 13 kA Prototype HTS Leads for the LHC / Ballarino, A ; Serio, L
Prototypes of 13 kA HTS current leads for the Large Hadron Collider (LHC) have been specified by CERN and produced by several manufacturers. The specification defines the required thermo-electric performance and the geometric limitations imposed by the LHC infrastructure. [...]
LHC-Project-Report-282; CERN-LHC-Project-Report-282.- Geneva : CERN, 1999 - 4 p. Access to fulltext document: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 1405 - Please contact the library if you need to access this document.
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12.
The AD Vacuum System : Construction and Commissioning ; rev. version / Brouet, M ; Hansen, J ; Klette, H ; Strubin, Pierre M
CERN has built a new experimental facility, called the Antiproton Decelerator (AD), by transforming two existing machines: the "Antiproton Collector" (AC) and the "Antiproton Accumulator" (AA). To achieve adequate beam performance once the antiproton beam is decelerated to its final value of 0.1 GeV/c, it was necessary to lower the average pressure by nearly two orders of magnitude. [...]
CERN-LHC-99-004-VAC.- Geneva : CERN, 1999 - 4 p. Report Fulltext: PS.GZ; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 562 - Please contact the library if you need to access this document.
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13.
First Experience with Control and Operational Models for Vacuum Equipment in the AD Decelerator / Strubin, Pierre M ; Trofimov, N N
Control and Operational models for Vacuum Equipment have been studied at CERN for several years [1]. A prototype implementation was tried out on ion gauges in LEP followed by a full-scale implementation for all vacuum equipment to be controlled in the newly built AD ring. [...]
CERN-LHC-99-003-VAC.- Geneva : CERN, 1999 - 4 p. Report Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 18th Biennial Particle Accelerator Conference, New York, NY, USA, 29 Mar - 2 Apr 1999, pp.e-proc. 346 - Please contact the library if you need to access this document.
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