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2.
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Aperture and Field Constraints for the Vacuum System in the LHC Injection Septa
/ Gyr, Marcel (CERN) ; Henrist, Bernard (CERN) ; Jiménez, J M (CERN) ; Lacroix, Jean Michel (CERN) ; Sgobba, Stefano (CERN)
Each beam arriving from the SPS has to pass through five injection septum magnets before being kicked onto the LHC orbit. The injection layout implies that the vacuum chambers for the two circulating beams pass through the septum magnet yokes at a flange distance from the chamber of the beam to be injected. [...]
LHC-Project-Report-815; CERN-LHC-Project-Report-815.-
Geneva : CERN, 2005 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2732
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3.
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Possible Causes and Consequences of Serious Failures of the LHC Machine Protection Systems
/ Filippini, R ; Goddard, B ; Gyr, Marcel ; Kain, V ; Schmidt, R ; Uythoven, J ; Wenninger, J
The LHC machine protection systems, including the beam dumping system, are designed to ensure that failures leading to serious damage to the LHC during its lifetime are extremely unlikely. These kind of failures, for instance requiring a combination of equipment failure and surveillance failure, have to date been considered as being 'beyond the design case'. [...]
LHC-Project-Report-755; CERN-LHC-Project-Report-755.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.620
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4.
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Aperture and Delivery Precision of the LHC Injection System
/ Goddard, B ; Gyr, Marcel ; Jeanneret, J B ; Kain, V ; Lamont, M ; Maire, V ; Mertens, V ; Wenninger, J
The main LHC injection elements in interaction regions 2 and 8 comprise the injection septa (MSI), the injection kickers (MKI), together with three families of passive protection devices (TDI, TCDD and TCLI). The apertures of the two circulating beams are detailed for these elements, together with a summary of recent design modifications. [...]
LHC-Project-Report-753; CERN-LHC-Project-Report-753.-
Geneva : CERN, 2004 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 9th European Particle Accelerator Conference, Lucerne, Switzerland, 5 - 9 Jul 2004, pp.572
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7.
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LHC beam dumping system : Extraction channel layout and acceptance
/ Goddard, B (CERN) ; Gyr, M (CERN) ; Uythoven, J (CERN) ; Veness, R (CERN) ; Weterings, W (CERN)
The LHC beam dumping system must safely abort the LHC beams under all conditions, including those resulting from abnormal behaviour of machine elements or subsystems of the beam dumping system itself. The extraction channels must provide sufficient aperture both for the circulating and extracted beams, over the whole energy range and under various beam parameters. [...]
LHC-Project-Report-654; CERN-LHC-Project-Report-654.-
Geneva : CERN, 2003 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 20th IEEE Particle Accelerator Conference, Portland, OR, USA, 12 - 16 May 2003, pp.1646
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8.
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Steel septum magnets for the LHC beam injection and extraction
/ Bidon, S ; Gerard, D ; Guinand, M ; Gyr, Marcel ; Sassowsky, M ; Weisse, E ; Weterings, W ; Abramov, A ; Ivanenko, A I ; Kolatcheva, E et al.
The Large Hadron Collider (LHC) will be a superconducting accelerator and collider to be installed in the existing underground LEP ring tunnel at CERN. It will provide proton-proton collisions with a centre of mass energy of 14 TeV. [...]
CERN-SL-2002-019-MS.-
Geneva : CERN, 2002 - 4 p.
High Energy Circular Accelerators and Colliders; Report
Access to fulltext document: PDF; External link: Published version from JACoW
In : 8th European Particle Accelerator Conference, Paris, France, 3 - 7 Jun 2002, pp.2514
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9.
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Protecting LHC Components Against Radiation Resulting From an Unsynchronized Beam Abort
/ Drozhdin, A I ; Gyr, Marcel ; Mokhov, N V ; Rakhno, I L ; Weisse, E
/CERN-US LHC Construction Collaboration
The effect of possible accidental beam loss in the LHC on the IP5 and IP6 insertion elements is studied via realistic Monte Carlo simulations. The scenario studied is beam loss due to unsynchronized abort at an accidental prefire of one of the abort kicker modules. [...]
LHC-Project-Report-478; FERMILAB-CONF-2001-133; CERN-LHC-Project-Report-478.-
Batavia, IL : FERMILAB, 2001 - 4 p.
Fulltext: PDF; IEEE Published version, local copy: PDF;
In : 19th IEEE Particle Accelerator Conference, Chicago, IL, USA, 18 - 22 Jun 2001, pp.e-proc. 3168 (v.4)
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13.
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What did we learn from the extraction experiments with bent crystals at the CERN SPS?
/ Elsener, K ; Fidecaro, Giuseppe ; Gyr, Marcel ; Herr, Werner ; Klem, J T ; Mikkelsen, U ; Weisse, E
The feasibility and properties of particle extraction from an accelerator by means of a bent crystal were studied extensively at the CERN SPS. The main results of the experiments are presented. [...]
CERN-SL-98-022-AP.-
Geneva : CERN, 1998 - 3 p.
Report
Access to fulltext document: PDF;
In : 6th European Particle Accelerator Conference, Stockholm, Sweden, 22 - 26 Jun 1998, pp.239-241
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14.
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On the energy dependence of proton beam extraction with a bent crystal
/ Arduini, Gianluigi ; Elsener, K ; Fidecaro, Giuseppe ; Gyr, Marcel ; Herr, Werner ; Klem, J T ; Mikkelsen, U ; Weisse, E
Proton beam extraction from the CERN SPS by means of a bent silicon crystal is reported at three different energies, 14 GeV, 120 GeV and 270 GeV. The experimental results are compared to computer simulations which contain a sound model of the SPS accelerator as well as the channeling phenomena in bent crystals. [...]
CERN-SL-97-055-AP.-
Geneva : CERN, 1998 - 15 p.
Report
- Published in : Phys. Lett. B 422 (1998) 325
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15.
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Extraction of 22 TeV/c lead ions from the CERN SPS using a bent silicon crystal
/ Arduini, Gianluigi ; Cornelis, Karel ; Elsener, K ; Ferioli, G ; Fidecaro, Giuseppe ; Gyr, Marcel ; Herr, Werner ; Klem, J T ; Weisse, E
The extraction of protons from the halo of a circulating beam has been repeatedly demonstrated at the SPS. In a recent experiment a coasting lead ion beam was available at a momentum of 270 GeV/c per charge corresponding to a total momentum of 22 TeV/c per ion and the possibility to extract ultrarelativistic lead ions with a bent crystal could be demonstrated for the first time. [...]
CERN-SL-97-036-AP.-
Geneva : CERN, 1998 - 4 p.
Report
Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.171-3
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16.
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Energy Dependence of Crystal Assisted Extraction at the CERN SPS
/ Arduini, Gianluigi ; Elsener, K ; Fidecaro, Giuseppe ; Gyr, Marcel ; Herr, Werner ; Klem, J T ; Mikkelsen, U ; Weisse, E
The feasibility of extracting particles from the halo of a circulating beam has been successfully demonstrated in an experiment at the SPS. Although most measurements were obtained at an intermediate energy of 120 GeV, more recently we had the opportunity to extract protons from a coasting beam at 14 GeV and 270 GeV, thus exploiting the full available energy range of the SPS. [...]
CERN-SL-97-031-AP.-
Geneva : CERN, 1998 - 4 p.
Report
Fulltext: PDF; External link: Published version from PAC97 index
In : 17th Particle Accelerator Conference, pp.168-70
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17.
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Calculation of the multipole coefficients of 2-dimensional magnetic fields from the spectrum analysis computed by FLUX2D
/ Gyr, Marcel
Two-dimensional fields in regions with constant material properties (magnetic permeability, dielectric permittivity, heat conductivity, etc.) can be derived from a complex potential function W, where the real and imaginary parts correspond to the scalar potential function F and the stream function Y respectively. In source-free regions (no currents, electric charges, heat sinks, etc.), the field, is conservative and its complex potential W is a harmonic function where F and Y satisfy the Laplace equation. [...]
SL-Note-97-62-BT.-
Geneva : CERN, 1997 - 14 p.
Note
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18.
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Deflection and extraction of Pb ions up to 33 TeV/c by a bent silicon crystal
/ Arduini, Gianluigi ; Biino, C ; Clément, M ; Cornelis, Karel ; Doble, Niels T ; Elsener, K ; Ferioli, G ; Fidecaro, Giuseppe ; Freund, A ; Gatignon, L et al.
The first results from an experiment to deflect a beam of fully stripped, ulta-relativistic Pb ions of 400 GeV/c per unit of charge, equivalent to 33 TeV/c, by means of a bent crystal are reported. Deflection efficiencies are as high as 14%, in agreement with theoretical predictions. [...]
CERN-SL-97-043-DI.-
Geneva : CERN, 1997 - 8 p.
Report
- Published in : Phys. Rev. Lett. 79 (1997) 4182-4185
APS Published version, local copy: PDF; Access to fulltext document: PDF;
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21.
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Laser scan with upstream crystal #1
/ Gyr, Marcel ; Ferrari, A
A laser scan was performed with the new U-shaped crystal G5, which has a known miscut of +1 mrad and is installed at the upstream position #1 in the TEC. The aim was to cross-check the angular sensitivity of the stepping motor of the goniometer, which theoretically should be 1.98 µrad/step..
SL-MD-Note-218.-
Geneva : CERN, 1996 - 3 p.
Note
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30.
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Proton extraction from the CERN SPS using a bent crystal
/ Elsener, K ; Fidecaro, Giuseppe ; Gyr, Marcel ; Herr, Werner ; Klem, J T ; Mikkelsen, U ; Weisse, S P ; Møller, S P ; Uggerhøj, Erik ; Vuagnin, G
The extraction of high energy particles from a circular accelerator by means of channeling in bent crystals is an attractive alternative to classical extraction schemes, in particular for high energy proton colliders where a classical scheme becomes expensive and incompatible with normal operation this paper reviews the ongoing extraction experiments at the CERN-SPS with bent silicon crystals. [...]
CERN-SL-95-88-AP.
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1995. - 22 p.
Access to fulltext document - Access to fulltext document
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31.
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A new concept in the design of the LHC beam dump
/ Zazula, J M (CERN) ; Gyr, Marcel (CERN) ; Stevenson, Graham Roger (CERN) ; Weisse, E (CERN)
Recent Monte Carlo cascade simulations have shown that a reduction in the maximum of deposited energy density can be obtained by applying a uniform magnetic field over a front part of the graphite core of the LHC dump. This paper shows the effect of field strength on spatial distributions of absorbed energy and temperatures, and discusses problems to be solved when designing a suitable magnet..
CERN-SL-95-39-BT; LHC-NOTE-334; CERN-LHC-Note-334.-
Geneva : CERN, 1996 - 3 p.
Report
Fulltext: PDF; External link: Published version from JACoW
In : 16th Biennial Particle Accelerator Conference and International Conference on High-Energy Accelerators, Dallas, TX, USA, 1 - 5 May 1995, pp.1891-1893
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32.
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High efficiency multi-pass proton beam extraction with a bent crystal at the SPS
/ Altuna, X ; Bussa, M P ; Carboni, G ; Dehning, Bernd (CERN) ; Elsener, K ; Ferrari, A ; Fidecaro, Giuseppe ; Freund, A ; Guinand, R ; Gyr, Marcel et al.
Recent measurements of 120GeV proton extraction by means of a bent silicon cryt the CERN-SPS accelerator are summarized. The existence of multi-pass extraction has been proven by blocking first-pass extraction: using a crystal covered with an amorphous layer, extracted beam with high efficiency was observed, which provides a direct proof for the importance of the multi-pass mechanism. [...]
CERN-SL-95-41-DI.-
Geneva : CERN, 1995 - 9 p.
Report
- Published in : Phys. Lett. B 357 (1995) 671-677
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33.
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Experimental evidence for multi-pass extraction with a bent crystal
/ Dehning, Bernd (CERN) ; Elsener, K (CERN) ; Fidecaro, Giuseppe (CERN) ; Gyr, Marcel (CERN) ; Herr, Werner (CERN) ; Klem, J T (CERN) ; Scandale, Walter (CERN) ; Vuagnin, G (CERN) ; Weisse, E (CERN) ; Weisz, S (CERN) et al.
The feasibility of extracting particles from the halo of a circulating proton beam using a bent silicon crystal has been demonstrated experimentally at the SPS for a beam energy of 120 GeV. Presently studies are conducted to understand the extraction mechanisms and the measured efficiencies. [...]
CERN-SL-95-36-AP.-
Geneva : CERN, 1996 - 3 p.
Report
Fulltext: PDF;
In : 16th Biennial Particle Accelerator Conference and International Conference on High-Energy Accelerators, Dallas, TX, USA, 1 - 5 May 1995, pp.470-472
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39.
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First results on proton extraction from the CERN-SPS with a bent crystal
/ Akbari, H ; Altuna, X ; Bardin, S ; Bellazzini, R ; Biryukov, V M ; Brez, A ; Bussa, M P ; Busso, L ; Calcaterra, A ; Carboni, G et al.
CERN-SL-93-28-DI.-
Geneva : CERN, 1993 - 14 p.
Report
- Published in : Phys. Lett. B 313 (1993) 491-497
Fulltext: PDF;
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61.
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Recent improvements in the performance of the SPS
/ Faugier, A (CERN) ; Gyr, Marcel (CERN) ; Hatton, V (CERN) ; Hilaire, A (CERN) ; Lauckner, R (CERN) ; Miles, J (CERN) ; Péraire, S (CERN) ; Thomas, D (CERN) ; Warman, A (CERN)
Describes the most relevant factors that have contributed to the steady improvement in performance of the SPS are a supplier of protons for the high energy physics programme of CERN. The maximum intensity is now 2.7*10/sup 13/ protons per pulse, the slow spills are better and for 90% of the scheduled time the beam is on the targets. [...]
1980
In : 11th International Conference on High-Energy Accelerators, CERN, Geneva, Switzerland, 7 - 11 Jul 1980, pp.305-9
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