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1997_PAC
11 items
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1.
The short straight sections for the LHC / Tortschanoff, Theodor ; Parma, Vittorio ; Rohmig, P ; Peyrot, M ; Rifflet, J M ; Védrine, P ; Vincent, D
During more than five years a close collaboration between CERN and CEA-Saclay led to the development and construction of two prototype quadrupole magnets and the integration of one of them into the short straight section of the LHC half-cell test string at CERN. In the frame of the special host country contribution to the LHC project this collaboration has been extended to the CNRS laboratory in Orsay and covers besides the quadrupole magnets the complete cold mass assembly (CEA) and the integration into the short straight section cryostat (CNRS). [...]
LHC-Project-Report-105; CERN-LHC-Project-Report-105.- Geneva : CERN, 1998 - 6 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3374-6 - Please contact the library if you need to access this document.
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2.
State of the LHC Main Magnets / Perin, R /LHC Magnet Team
The main features of the dipole magnet design have been frozen in 1996 and important steps for the preparation of their series production are being taken in the current year. To finilize the technical specifications of the superconducting cables and other components, a number of detail variants are being validated with the construction and test of short and long magnets. [...]
LHC-Project-Report-108; CERN-LHC-Project-Report-108.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3371-3 - Please contact the library if you need to access this document.
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3.
Experiments and cycling at the LHC prototype helf-cell / Casas-Cubillos, J ; Collier, Paul ; Cruikshank, P ; Dahlerup-Petersen, K ; Desforges, B ; Hilbert, B ; Krainz, G ; Momal, F ; Rijllart, A ; Rodríguez-Mateos, F et al.
The first version of the LHC prototype half-cell has been in operation since February 1995. It consists of one quadrupole and three 10-m twin aperture dipole magnets which operate at 1.8 K. [...]
LHC-Project-Report-110; CERN-LHC-Project-Report-110.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3206-8 - Please contact the library if you need to access this document.
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4.
Mechanical design and layout of the LHC standard half-cell / Brunet, J C ; Cruikshank, P ; Erdt, W K ; Genet, M ; Parma, Vittorio ; Poncet, Alain ; Rohmig, P ; Skoczen, Blazej ; Van Weelderen, R ; Vlogaert, J et al.
The LHC Conceptual Design Report issued on 20th October 1995 [1] introduced significant changes to some fundamental features of the LHC standard half-cell, composed of one quadrupole, 3 dipoles and a set of corrector magnets. A separate cryogenic distribution line has been adopted containing most of the distribution lines previously installed inside the main cryostat. [...]
LHC-Project-Report-111; CERN-LHC-Project-Report-111.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3368-70 - Please contact the library if you need to access this document.
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5.
Dynamic Effects and their Control at the LHC / Bailey, R ; Bordry, Frederick ; Bottura, L ; Burla, P ; Collier, Paul ; Henrichsen, K N ; Koutchouk, Jean-Pierre ; Lauckner, R J ; Parker, R ; Pett, John G et al.
Tune, chromaticity and orbit of the LHC beams have to be precisely controlled by synchronising the magnetic field of quadrupole, sextupole and corrector magnets.This is a challenging task for an accelerator using superconducting magnets, whose field and field errors will have large dynamic effects.The accelerator physics requirements are tight due to the limited dynamic aperture and the large energy stored in the beams.The power converters need to be programmed in order to generate the magnetic functions with defined tolerances. During the injection process and the energy ramp the magnetic performance cannot be predicted with sufficient accuracy, and therefore real-time feedback systems based on magnetic measurements and beam observations are proposed. [...]
LHC-Project-Report-124; CERN-LHC-Project-Report-124.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.66-8 - Please contact the library if you need to access this document.
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6.
Beam Induced Multipacting / Gröbner, Oswald
Beam induced multipacting driven by the electric field of successive bunches, as first observed in the ISR proton-proton storage ring [1] may arise from a resonance motion of a cloud of secondary electrons bouncing back and forth between opposite walls of the vacuum chamber. Under conditions where the average secondary electron yield of this process exceeds unity, the electron cloud may increase exponentially. [...]
LHC-Project-Report-127; CERN-LHC-Project-Report-127.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3589-91 - Please contact the library if you need to access this document.
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7.
Mechanical Design Aspects of The LHC Beam screen / Cruikshank, P ; Artoos, K ; Bertinelli, F ; Brunet, J C ; Calder, R ; Campedel, C ; Collins, I R ; Dalin, J M ; Feral, B ; Gröbner, Oswald et al.
Forty-four kilometers of the LHC beam vacuum system [1,2] will be equipped with a perforated co-axial liner, the so-called beam screen. Operating between 5 K and 20 K, the beam screen reduces heat loads to the 1.9 K helium bath of the superconducting magnets and minimises dynamic vacuum effects. [...]
LHC-Project-Report-128; CERN-LHC-Project-Report-128.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3586-8 - Please contact the library if you need to access this document.
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8.
Systems Layout of the Low-$\beta$ Insertions for the LHC Experiments / Ostojic, R ; Taylor, T M ; Weisz, S
The LHC experimental insertions consist of a low-beta triplet, a pair of separation dipoles, and a matching section of four quadrupoles. The superconducting low-beta quadrupoles must accommodate separated beams at injection, provide high field gradients and low multipole errors for colliding beams, and sustain considerable heat load from secondary particles generated in the high luminosity ATLAS and CMS experiments. [...]
LHC-Project-Report-129; CERN-LHC-Project-Report-129.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3696-8 - Please contact the library if you need to access this document.
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9.
Quench Performance and Field Quality Measurements of the First LHC low-$\beta$ Quadrupole Model / Ostojic, R ; Kirby, G A ; Schmidt, R ; Taylor, T M ; Milward, S R ; Morris, J ; Nobes, S ; Smith, K ; Street, A J ; Townsend, M C et al.
As part of the LHC magnet development program, CERN in collaboration with Oxford Instruments has designed, built and tested a one metre model of a 70 mm aperture low-beta quadrupole. The magnet features a four layer coil, and is designed for 250 T/m at 1.9 K. [...]
LHC-Project-Report-130; CERN-LHC-Project-Report-130.- Geneva : CERN, 1998 - 4 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3209-11 - Please contact the library if you need to access this document.
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10.
The LHC Vacuum System / Gröbner, Oswald
The Large Hadron Collider (LHC) at CERN, involves two proton storage rings with colliding beams of 7 TeV. The machine will be housed in the existing LEP tunnel and requires 16 m long superconducting b ending magnets. [...]
LHC-Project-Report-181; CERN-LHC-Project-Report-181.- Geneva : CERN, 1998 - 5 p. Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.3542-6 - Please contact the library if you need to access this document.
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11.
Control and operational models for vacuum equipment / Strubin, Pierre M ; Trofimov, N N
perational models which describe the behaviour and the physical values associated with the vacuum equipment as seen by an operator have been studied for some time at CERN. Recently, they have been completed by control models, which define in a formal way the data structures required to access the physical values described in the operational model. [...]
CERN-LHC-97-005-VAC.- Geneva : CERN, 1998 - 4 p. Report Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.2440-2 - Please contact the library if you need to access this document.
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