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Quench Performance of the LHC Insertion Magnets
Nuria Catalan Lasheras;Walter Venturini Delsolaro;Andrzej Siemko;Ranko Ostojic;Glyn Kirby
After final installation in the LHC tunnel, the MQM and MQY quadrupole magnets of the LHC insertions are now being commissioned to their nominal currents. These two types of magnets operate at 1.9 K and 4.5 K and with nominal currents ranging from 3600 A to 5390 A. From the very first acceptance tests of the bare magnets coming from the manufacturers, they have been powered using different cycles,...Show More
Magnetic Performance of the Main Superconducting Magnets for the LHC
S. Sanfilippo;N. Sammut;L. Bottura;M. Di-Castro;A. Basu;J.-P. Koutchouk;E. Todesco;P. Hagen;N. Catalan-Lasheras;W. Venturini-Delsolaro;C. Giloux;R. Wolf
The field strength and homogeneity of all the LHC superconducting magnets were measured as a part of the production control and qualification process that has taken place during the past four years. In addition to field measurements at room temperature performed on the integral of the production, a significant part of the magnets has been subjected to extensive magnetic measurements at cold. The m...Show More
Magnet acceptance and allocation at the LHC magnet evaluation board
P. Bestmann;L. Bottura;N. Catalan-Lasheras;S. Fartoukh;S. Gilardoni;M. Giovannozzi;J.-B. Jeanneret;M. Karppinen;A. Lombardi;K.-H. Mess;D. Missiaen;M. Modena;R. Ostojic;Y. Papaphilippou;P. Pugnat;S. Ramberger;S. Sanfilippo;W. Scandale;F. Schmidt;N. Siegel;A. Siemko;T. Tortschanoff;D. Tommasini;E. Wildner
The normal and superconducting magnets for the LHC ring have been carefully examined to insure that each of about 1900 assemblies is suitable for the operation in the accelerator. Hardware experts and accelerator physicists have contributed to this work that consisted in magnet acceptance, and sorting according to geometry, field quality and quench level. This paper gives a description of the magn...Show More
Magnet acceptance and allocation at the LHC magnet evaluation board
P. Bestmann;L. Bottura;N. Catalan-Lasheras;S. Fartoukh;S. Gilardoni;M. Giovannozzi;J.-B. Jeanneret;M. Karppinen;A. Lombardi;K.-H. Mess;D. Missiaen;M. Modena;R. Ostojic;Y. Papaphilippou;P. Pugnat;S. Ramberger;S. Sanfilippo;W. Scandale;F. Schmidt;N. Siegel;A. Siemko;T. Tortschanoff;D. Tommasini;E. Wildner
Year: 2007 | Conference Paper |
Construction and qualification of the pre-series MQM superconducting quadrupoles for the LHC insertions
R. Ostojic;N. Catalan Lasheras;J. Lucas;W. Venturini Delsolaro;D. Landgrebe
The LHC insertions will be equipped with individually powered MQM superconducting quadrupoles, produced in three versions with magnetic lengths of 2.4 m, 3.4 m, and 4.8 m. The quadrupoles feature a 56 mm aperture coil, designed on the basis of an 8.8 mm wide Rutherford-type NbTi cable for a nominal gradient of 200 T/m at 1.9 K and 5390 A. A total of 96 quadrupoles are in production in Tesla Engine...Show More
Fabrication of the pre-series wide aperture superconducting quadrupoles for the LHC insertions
G.A. Kirby;N. Catalan Lasheras;R. Ostojic;R. Burgmer;M. Jordan;D. Krischel;P. Schmidt
Individually powered superconducting quadrupoles with a coil bore of 70 mm will be installed in the LHC insertions, in areas where increased geometrical acceptance and improved field quality are required. The quadrupoles feature a four-layer coil, designed on the basis of two graded 8.3 mm wide Rutherford-type NbTi cables. The magnets have a magnetic length of 3.4 m and a nominal gradient of 160 T...Show More
Mechanical design of a ferrite-based injection kicker for SNS accumulator ring
C. Pai;N. Catalan-Lasheras;W. Eng;H. Hseuh;Y. Lee;R. Lambiase;W. Meng;J. Sandberg;S. Tepikian;J. Tuozzolo
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
Two sets of kickers, 4 pulsed dipoles in each set, will be used in the SNS accumulator ring to create a dynamic orbit bump for injection process. These kickers are designed as large aperture, window frame magnets. The design of these 8 kickers has been completed. The first article kicker has been assembled and is being tested. In this paper we discuss the mechanical design criteria for these kicke...Show More
Integration of the beam scraper and primary collimator in the SNS ring
H. Ludewig;N. Simos;D. Davino;S. Cousineau;N. Catalan-Lasheras;J. Brodowski;J. Touzzolo;C. Longo;B. Mullany;D. Raparia
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (2)
The collimation system in the SNS ring includes a two-stage collimator consisting of a halo scraper and an appropriate fixed aperture collimator. This unit is placed between the first quadru-pole and the first doublet in the collimation straight section of the ring. The scraper is situated at the exact mid-point between these two magnets, and the fixed aperture collimator fills the space between t...Show More
Electron-cloud mitigation in the Spallation Neutron Source ring
J. Wei;M. Blaskiewicz;J. Brodowski;P. Cameron;D. Davino;A. Fedotov;P. He;H. Hseuh;Y.Y. Lee;H. Ludewig;W. Meng;D. Raparia;J. Tuozzolo;S.Y. Zhang;A. Aleksandrov;S. Cousineau;V. Danilov;S. Henderson;M. Furman;M. Pivi;R. Macek;N. Catalan-Lasheras
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
The Spallation Neutron Source (SNS) accumulator ring is designed to accumulate, via H/sup -/ injection, protons of 2 MW beam power at 1 GeV kinetic energy at a repetition rate of 60 Hz. At such beam intensity, electron-cloud is expected to be one of the intensity-limiting mechanisms that complicate ring operations. This paper summarizes mitigation strategy adopted in the design, both in suppressin...Show More
Electron-cloud mitigation in the Spallation Neutron Source ring
J. Wei;M. Blaskiewicz;J. Brodowski;P. Cameron;D. Davino;A. Fedotov;P. He;H. Hseuh;Y.Y. Lee;H. Ludewig;W. Meng;D. Raparia;J. Tuozzolo;S.Y. Zhang;A. Aleksandrov;S. Cousineau;V. Danilov;S. Henderson;M. Furman;M. Pivi;R. Macek;N. Catalan-Lasheras
SNS ring optics tuning
J.A. Holmes;W. Wan;N. Catalan-Lasheras;A. Fedotov;I. Papaphilippou;J. Wei
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (1)
Detailed studies of the SNS ring lattice optics have been conducted. The horizontal and vertical tuning ranges for matched solutions with well-behaved lattice functions were determined and the power supply margin verified. Using stability criteria, potential working points have been identified and studied in detail. Studies, focused on behavior of the lattice functions under increasingly complex a...Show More
Effect of magnetic fields on the dose estimates due to beam halo loss in the ring collimation straight of the SNS
H. Ludewig;A. Mallen;N. Catalan-Lasheras;N. Simos;J. Wei;M. Todosow
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
The collimation straight section of the SNS ring consists of three collimators with magnets (doublets and correctors) between them. It has been determined that a large fraction of the particle halo loss occurs at the primary and secondary collimators. The dose to ring components in this location has been studied in the past. In this revised dose estimate the effect of including the magnetic fields...Show More
The collimation system of the SNS transfer lines
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (2)
The High Energy Beam Transport (HEBT) and Ring to Target Beam Transport (RTBT) lines of the Spallation Neutron Source (SNS) include collimation systems that protect the line itself, as well as the systems downstream. Due to the one-pass mechanism in a transfer line, collimation can only provide protection against accidental losses while shaping the beam is reserved for multi-pass systems as rings....Show More
Collimation optimization in high intensity rings
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
In high intensity proton rings, collimation is needed in order to maintain reasonable levels of residual activation and allow hands-on maintenance. A small acceptance to emittance ratio and restrained longitudinal space become important restrictions when dealing with low energy rings. The constraints and specifications when designing a collimation system for this type of machine will be reviewed. ...Show More
Design optimization and the path towards a 2 MW Spallation Neutron Source
J. Wei;M. Blaskiewicz;N. Catalan-Lasheras;D. Davino;A. Fedotov;Y.Y. Lee;N. Malitsky;Y. Papaphilippou;D. Raparia;A. Shishlo;N. Tsoupas;W. Weng;S.Y. Zhang;R. Keller;J. Staples;J. Stovall;J. Billen;S. Kurennoy;S. Nath;H. Takeda;L. Young;R. Sundelin;A. Aleksandrov;Y. Cho;P. Chu;S. Cousineau;V. Danilov;M. Doleans;J. Galambos;J. Holmes;N. Holtkamp;S. Kim;R. Kustom;D. Jeon;E. Tanke;W. Wan
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (3)
The Spallation Neutron Source (SNS) is designed to ultimately reach an average proton beam power of 2 MW for pulsed neutron production. The SNS physics groups analyze the machine performance within the hardware constraints, optimize the accelerator design, and establish the best path towards a 2 MW and higher Spallation Neutron Source.Show More
Design optimization and the path towards a 2 MW Spallation Neutron Source
J. Wei;M. Blaskiewicz;N. Catalan-Lasheras;D. Davino;A. Fedotov;Y.Y. Lee;N. Malitsky;Y. Papaphilippou;D. Raparia;A. Shishlo;N. Tsoupas;W. Weng;S.Y. Zhang;R. Keller;J. Staples;J. Stovall;J. Billen;S. Kurennoy;S. Nath;H. Takeda;L. Young;R. Sundelin;A. Aleksandrov;Y. Cho;P. Chu;S. Cousineau;V. Danilov;M. Doleans;J. Galambos;J. Holmes;N. Holtkamp;S. Kim;R. Kustom;D. Jeon;E. Tanke;W. Wan
SNS beam in gap removal
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Stringent particle loss constraints for the SNS accumulator ring require that the beam gap must be kept clean. A fixed amplitude stripline kicker capable of reversing polarity turn by turn is being designed for this purpose. We present simulations of the beam in gap cleaning process, using the ORBIT code and modeling the kicker as a constant amplitude kick of programmable polarity sequence. We fin...Show More
Thermo-mechanical response of the halo intercepts interacting with the SNS proton beam
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
The integral part of the primary collimator of the SNS accumulator ring is a halo intercept assembly in the form of movable scraper blades that allow the interception of the halo protons in four planes. In order to achieve large Coulomb scattering of the halo protons and energy losses of less than 1%, platinum was chosen as the material of choice while its thickness was optimized to satisfy the en...Show More
Double-wall collimator design of the SNS project
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (2)
The collimator absorber array of the Spallation Neutron Source (SNS) project is responsible for stopping the 1.0 GeV protons that are in the halo of the beam. It is estimated that 0.1% of the 2 MW beam will be intercepted by the adopted collimating scheme implemented at various sections of the beam transport and accumulation. This paper summarizes the conceptual design of the collimator absorber a...Show More
On the use of thin scrapers for momentum collimation
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
In transverse collimation systems, thin scrapers are used as primary collimators to interact with the beam halo and increase its impact parameter on the secondary collimators or absorbers. In the same way, placing the primary collimator in a dispersion region is used for momentum collimation. However, the use of scrapers for momentum collimation presents an additional disadvantage when handling me...Show More
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