Stabilizing effect of a double-harmonic RF system in the CERN PS (2009)
Bhat, C, Caspers, F, Damerau, H, Hancock, S, Mahner, E, Zimmermann, F
Motivated by the discussions on scenarios for LHC upgrades, beam studies on the stability of flat bunches in a double-harmonic RF system have been conducted in the CERN Proton Synchrotron (PS)....
Shaposhnikova, E N, Arduini, Gianluigi, Axensalva, J, Benedetto, E, Calatroni, S, Chiggiato, P, ...
Electron cloud build-up is a major limitation for the operation of the SPS with LHC beam above nominal intensity. These beams are envisaged in the frame of the LHC luminosity upgrade and will be...
Stabilizing Effect of a Double-Harmonic RF System in the CERN PS (2009)
Bhat, C M, Caspers, F, Damerau, H, Hancock, S, Mahner, E, Zimmermann, F
Motivated by the discussions on scenarios for LHC upgrades, beam studies on the stability of flat bunches in a double-harmonic RF system have been conducted in the CERN Proton Synchrotron (PS)....
Barnes, M J, Caspers, F, Cornelis, K, Ducimetière, L, Mahner, E, Papotti, G, ...
Fast kicker magnets are used to inject beam into and eject beam out of the CERN SPS accelerator ring. These kickers are generally ferrite loaded transmission line type magnets with a rectangular...
Radiation zoning for vacuum equipment of the CERN Large Hadron Collider (2009)
Mahner, E, Chemli, S, Cruikshank, P, Forkel-Wirth, D, Jiménez, J M
Beam losses in high-energy particle accelerators are responsible for beam lifetime degradation. In the LHC beam losses will create a shower of particles while interacting with materials from the beam...
Kollmus, H, Kraemer, A, Bender, M, Bellachioma, MC, Reich-Sprenger, H, Mahner, E, ...
For the GSI future project Facility for Antiproton and Ion Research a beam intensity of 10^12 U^(28+) ions/s is planned to be extracted from the GSI heavy ion synchrotron SIS18. Measurements...
Review of Heavy-ion Induced Desorption Studies for Particle Accelerators (2008)
During high-intensity heavy-ion operation of several particle accelerators worldwide, large dynamic pressure rises of orders of magnitude were caused by lost beam ions that impacted under grazing...
Electron Cloud Mitigation by Fast Bunch Compression in the CERN PS (2008)
Damerau, H, Hancock, S, Kroyer, T, Mahner, E, Schokker, M
A fast transverse instability has been observed with nominal LHC beams in the CERN Proton Synchrotron (PS) in 2006. The instability develops within less than 1 ms, starting when the bunch length...
Experimental Electron Cloud Studies in the CERN Proton Synchrotron (2008)
Mahner, E, Kroyer, T, Caspers, F
Indications for a beam-induced electron cloud build-up are observed since 2000 for the nominal LHC beam in the PS to SPS transfer line and during the last turns before ejection from the PS. A new...
IONS FOR LHC: STATUS OF THE INJECTOR CHAIN (2008)
D. Manglunki, A. Beuret, J. Borburgh, Ch. Carli, M. Chanel, L. Dumas, ...
The LHC will, in addition to proton runs, be operated with Pb ions and provide collisions at energies of 5.5 TeV per nucleon pair, i.e. more than 1.1 PeV per event, to experiments. The transformation...
LEIR: TOWARDS THE NOMINAL LEAD ION BEAM (2008)
M. Chanel, M. E Angoletta, V. Baggiolini, P. Belochitskii, A. Beuret, A. Blas, ...
The Low Energy Ion Ring (LEIR) is a central piece for LHC ion operation at CERN, transforming long Linac3 pulses into high density bunches needed for LHC. The first phase of LEIR commissioning...
THE LHC LEAD INJECTOR CHAIN (2008)
A. Beuret, J. Borburgh, A. Blas, H. Burkhardt, C. Carli, M. Chanel, ...
A sizeable part of the LHC physics programme foresees lead-lead collisions with a design luminosity of 10 27 cm-2 s-1. This will be achieved after an upgrade of the ion injector chain comprising...
ELENA, a preliminary cost and feasibility study (2007)
Angoletta, M-E, Barnes, M, Beuret, A, Belochitskii, P, Borburgh, J, Bourquin, P, ...
To produce dense pbar beams at very low energies (100-200 keV), a small decelerator ring could be built and installed between the existing AD ring and the experimental area. Phase-space blowup during...
IONS FOR LHC: STATUS OF THE INJECTOR CHAIN (2007)
Manglunki, Django, Beuret, A, Borburgh, J, Carli, C, Chanel, M, Dumas, L, ...
The LHC will, in addition to proton runs, be operated with Pb ions and provide collisions at energies of 5.5 TeV per nucleon pair, i.e. more than 1.1 PeV per event, to experiments. The transformation...
The CERN SPL Chopper Structure. A Status Report (2007)
Kroyer, T, Caspers, F, Mahner, E
In the framework of HIPPI, a study for a Superconducting Proton Linac is being carried out at CERN. An integral part of the medium energy line is the chopper, which has to establish the required time...
The Vacuum System of the Low Energy Ion Ring at CERN: Requirements, Design, and Challenges (2005)
For the heavy ion program at CERN’s Large Hadron Collider, lead-lead collisions with a design luminosity of 10**27 cm**-2s**-1 are foreseen. This will be achieved after an upgrade of the ion...
Mahner, E, Hansen, J, Küchler, D, Malabaila, M, Taborelli, M
The ion-induced desorption experiment, installed in the CERN Heavy Ion Accelerator LINAC 3, has been used to measure molecular desorption yields for 4.2 MeV/u lead ions impacting under grazing...
The LHC Lead Injector Chain (2004)
Beuret, A, Borburgh, J, Blas, A, Burkhardt, H, Carli, Christian, Chanel, M, ...
A sizeable part of the LHC physics programme foresees lead-lead collisions with a design luminosity of 1027 cm-2 s-1. This will be achieved after an upgrade of the ion injector chain comprising...
Limits to the Performance of the LHC with Ion Beams (2004)
Jowett, John M, Braun, Hans Heinrich, Gresham, M I, Mahner, E, Nicholson, A N, Shaposhnikova, Elena, ...
The performance of the LHC as a heavy-ion collider will be limited by a diverse range of phenomena that are often qualitatively different from those limiting the performance with protons. We...
Mahner, E, Hansen, J, Küchler, D, Malabaila, M, Taborelli, M
The ion-induced desorption experiment, installed in the CERN Heavy Ion Accelerator (LINAC 3), has been used to measure molecular desorption yields for 4.2 MeV/u lead ions impacting on different...
A New Instrument to Measure the Surface Resistance of Superconducting Samples at 400 MHz (2003)
Mahner, E, Calatroni, S, Chiaveri, Enrico, Häbel, E, Tessier, J M
A 400-MHz niobium quadrupole resonator has been manufactured to study the rf properties of superconducting bulk and thin film samples at low temperatures. We describe the apparatus, i.e. the...
Molecular desorption of stainless steel vacuum chambers irradiated with 4.2 MeV/u lead ions (2003)
Mahner, E, Hansen, J, Laurent, Jean Michel, Madsen, N
In preparation for the heavy ion program of the Large Hadron Collider (LHC) at CERN, accumulation and cooling tests with lead ion beams have been performed in the Low Energy Antiproton Ring (LEAR)....
Mahner, E, Hansen, J, Küchler, D, Malabaila, M, Taborelli, M
Ion-induced gas desorption yields were investigated for 4.2 MeV/u lead ions incident on 316 LN stainless steel surfaces. Focussed on a possible application for the Low Energy Ion Ring (LEIR) vacuum...
CTF3 Design Report: Preliminary Phase (2001)
Allard, D, Bartholome, B, Bernard, M, Bertuzzi, J P, Bienvenu, G, Bonzano, R, ...
The design of CLIC is based on a two-beam scheme, where the short pulses of high power 30 GHz RF are extracted from a drive beam running parallel to the main beam. The 3rd generation CLIC Test...
Experimental Investigation of Impact-Induced Molecular Desorption by 4.2 MeV/u Pb ions (2001)
Chanel, M, Hansen, J, Laurent, Jean Michel, Madsen, N, Mahner, E
In preparation for the heavy ion program of the LHC, accumulation and cooling test with lead ion beams have been performed in the LEAR storage ring. These tests have revealed that due to the...
Feasibility Study of a Neutron Time Of Flight Facility at the CERN-PS (1999)
Andriamonje, Samuel A, Watson, T, Zanolli, M, Buono, S, Buttkus, J, Cennini, E, ...
This report summarises the feasibility study of a neutron time-of-flight facility at the CERN-PS as described in Refs. [1] and [2]. The idea is to extract at 24 GeV/cproton bunches (r.m.s. length ~7...
Brigant, E, Häbel, E, Mahner, E
A disk-shaped superconducting sample is welded onto an Nb support cylinder and exposed to the magnetic RF field of a four-wire transmission line resonator. The fields on the cylinder wall decay in a...
The quadrupole resonator: Construction, RF System Field Calculations and First Applications (1998)
Chiaveri, Enrico, Häbel, E, Mahner, E, Tessier, J M
The quadrupole resonator allows measurement of the RF properties of superconducting (sc) films deposited on disk-shaped metallic substrates. We describe the construction of the apparatus, the brazing...
Metallurgical analysis and RF losses in superconducting niobium thin film cavities (1996)
Bloess, D, Durand, C, Mahner, E, Nakai, H, Weingarten, Wolfgang, Bosland, P, ...
Copper cavities with a thin niobium film as used in the large electron positron collider LEP would be also attractive for future linear colliders, provided the decrease of the Q-value with the...