483489 SzGeCERN 20230531152035.0 oai:cds.cern.ch:483489 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERN annual report 2001-3.2260 INSPEC 6937498 SPIRES 4564421 Inspire 540211 LHC-Project-Report-451 eng CERN-LHC-Project-Report-451 Le Naour, S Test Station for Magnetization Measurements on Large Quantities of Superconducting Strands 2001 Geneva CERN 22 Dec 2000 5 p paper In the superconducting main magnets of the Large Hadron Collider (LHC), persistent currents in the superconductor determine the field quality at injection field. For this reason it is necessary to check the magnetization of the cable strands during their production. During four years, this requires measurements of the width of the strand magnetization hysteresis loop at 0.5 T, 1.9 K, at a rate of up to eight samples per day. This paper describes the design, construction and the first results of a magnetization test station built for this purpose. The samples are cooled in a cryostat, with a 2-m long elliptic tail. This tail is inserted in a normal conducting dipole magnet with a field between ± 1.5 T. Racetrack pick-up coils, integrated in the cryostat, detect the voltage due to flux change, which is then integrated numerically. The sample holder can contain eight strand samples, each 20 cm long. The test station operates in two modes: either the sample is fixed while the external field is changed, or the sample is moved while the field remains constant. First results of calibration measurements with nickel and niobium are reported. 20010123SLAC CERN EDS SIS INSP2001 6937498 SIS:2001 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable INSPEC A0755 (Magnetic instruments and techniques) INSPEC A0620H (Measurement standards and calibration) INSPEC A7470 (Superconducting materials) INSPEC A7430C (Magnetic properties of superconductors) INSPEC B7310L (Magnetic variables measurement) INSPEC B3220M (Superconducting wires and tapes) INSPEC B7130 (Measurement standards and calibration) INSPEC CI Ni el; Nb el INSPEC NI magnetic flux density: 5 INSPEC calibration INSPEC magnetic-hysteresis INSPEC magnetic-variables-measurement INSPEC magnetisation INSPEC multifilamentary-superconductors Wolf, R Billan, J Genest, J LHC EST 3086-9 1.3 IEEE Trans. Appl. Supercond. 11 2001 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-451 http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002237262 IEEE Published version, local copy http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-451 Access to fulltext document http://cds.cern.ch/record/483489/files/cer-002237262.pdf IEEE Published version, local copy http://cds.cern.ch/record/483489/files/lhc-project-report-451.pdf Access to fulltext document http://cds.cern.ch/record/483489/files/lhc-project-report-451.ps.gz Access to fulltext document Evelyne.Delucinge@cern.ch CERN n 200104 a2001 13 20100728 1107 CER01 20010116 PUBLIC 002237262CER ARTICLE 0001 483490 SzGeCERN 20230531152036.0 oai:cds.cern.ch:483490 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERN annual report 2001-3.1474 INSPEC 6937225 SPIRES 4564430 Inspire 540212 LHC-Project-Report-452 eng CERN-LHC-Project-Report-452 Bottura, L Performance of the LHC Final Design, Full-Scale Superconducting Dipole Prototypes 2001 Geneva CERN 22 Dec 2000 4 p paper Within the LHC magnet program, a series of six, final design, full-scale superconducting dipole prototypes are presently being built in industry and tested at CERN. The main features of these magnets are: two-in-one structure, 56 mm aperture, six-block two layer coils wound from 15.1 mm wide graded NbTi cables, and all-polyimide insulation. This paper reviews the main test results of magnets tested to day at 4.2 K and 1.8 K. The results of the quench training, conductor performance, magnet protection, sensitivity to ramp rate and field quality are presented and discussed in terms of the design parameters and the aims of the full scale dipole prototype program. 20010123SLAC CERN EDS SIS INSP2001 6937225 SIS:2001 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable INSPEC A2920D (Storage rings) INSPEC A2921 (Beams in particle accelerators) INSPEC A2920L (Synchrotrons) INSPEC B7410B (Particle beam handling and diagnostics) INSPEC B3240E (Superconducting coils and magnets) INSPEC B8130D (Superconducting power cables) INSPEC B3220M (Superconducting wires and tapes) INSPEC CI NbTi bin, Nb bin, Ti bin INSPEC NI size: 5 INSPEC accelerator-magnets INSPEC ion-accelerators INSPEC magnetic-fields INSPEC magnetic-moments INSPEC multifilamentary-superconductors INSPEC niobium-alloys INSPEC proton-accelerators INSPEC storage-rings INSPEC superconducting-cables INSPEC superconducting-device-testing INSPEC superconducting-magnets INSPEC synchrotrons INSPEC titanium-alloys Pugnat, P Siemko, A Vlogaert, J Wyss, C LHC 1554-7 1/2 IEEE Trans. Appl. Supercond. 11 2001 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-452 http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002237263 IEEE Published version, local copy http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-452 Access to fulltext document http://cds.cern.ch/record/483490/files/cer-002237263.pdf IEEE Published version, local copy http://cds.cern.ch/record/483490/files/lhc-project-report-452.pdf Access to fulltext document http://cds.cern.ch/record/483490/files/lhc-project-report-452.ps.gz Access to fulltext document Evelyne.Delucinge@cern.ch CERN n 200104 a2001 13 20100728 1107 CER01 20010116 PUBLIC 002237263CER ARTICLE 0001 483491 SzGeCERN 20230531152036.0 oai:cds.cern.ch:483491 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERCER 2237264 INSPEC 6937238 CERN annual report 2001-3.1177 SPIRES 4564448 Inspire 540213 LHC-Project-Report-453 eng CERN-LHC-Project-Report-453 Bottura, L Measurements of Magnetic Field Pattern in a Short LHC Dipole Model 2001 Geneva CERN 22 Dec 2000 5 p paper The magnetic field in superconducting accelerator magnets has a fine structure with longitudinal periodicity. This periodic pattern, with period identical to the cable twist pitch, is originated by uneven current distribution within the cable. Here we present results of measurements of the periodic pattern performed in an LHC dipole model. We report in particular the results obtained powering the magnet with simple current steps and typical operation cycles as will be used during accelerator operation. The main result of the analysis is the time variation of the amplitude of the periodic pattern, from which we infer the evolution of the current distribution in the cable. We discuss the dependence of the pattern amplitude on ramp and pre-cycle parameters. 20010123SLAC CERN EDS SIS INSP2001 6937238 SIS:2001 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable INSPEC A2921 (Beams in particle accelerators) INSPEC A2915 (Electrostatic and linear particle accelerators) INSPEC A2920 (Cyclic accelerators and storage facilities) INSPEC B7410B (Particle beam handling and diagnostics) INSPEC B5180F (Solenoids and electromagnets) INSPEC B3240E (Superconducting coils and magnets) INSPEC B8130D (Superconducting power cables) INSPEC B7310L (Magnetic variables measurement) INSPEC accelerator-magnets INSPEC colliding-beam-accelerators INSPEC current-distribution INSPEC magnetic-field-measurement INSPEC magnetic-fields INSPEC superconducting-cables INSPEC superconducting-magnets Breschi, M Schneider, M LHC 1605-8 1.2 IEEE Trans. Appl. Supercond. 11 2001 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-453 http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002237264 IEEE Published version, local copy http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-453 Access to fulltext document http://cds.cern.ch/record/483491/files/cer-002237264.pdf IEEE Published version, local copy http://cds.cern.ch/record/483491/files/lhc-project-report-453.pdf Access to fulltext document http://cds.cern.ch/record/483491/files/lhc-project-report-453.ps.gz Access to fulltext document Evelyne.Delucinge@cern.ch CERN Univ. Bologna Tech. Univ. Wien n 200104 a2001 13 20100729 1036 CER01 20010116 PUBLIC 002237264CER ARTICLE 0001 483492 SzGeCERN 20230531152036.0 oai:cds.cern.ch:483492 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERCER 2237265 INSPEC 6937239 CERN annual report 2001-3.0894 SPIRES 4564456 Inspire 513464 LHC-Project-Report-454 eng CERN-LHC-Project-Report-454 Bottura, L Interaction between Current Imbalance and Magnetization in LHC Cables 2001 Geneva CERN 22 Dec 2000 5 p paper The quality of the magnetic field in superconducting accelerator magnets is associated with the properties of the superconducting cable. Current imbalances due to coupling currents DI, as large as 100 A, are induced by spatial variations of the field sweep rate and contact resistances. During injection at a constant field all magnetic field components show a decay behavior. The decay is caused by a diffusion of coupling currents into the whole magnet. This results in a redistribution of the transport current among the strands and causes a demagnetization of the superconducting cable. As soon as the field is ramped up again after the end of injection, the magnetization rapidly recovers from the decay and follows the course of the original hysteresis curve. In order to clarify the interactions between the changes in current and magnetization during injection we performed a number of experiments. A magnetic field with a spatially periodic pattern was applied to a superconducting wire in order to simulate the coupling behavior in a magnet. This model system was placed into a stand for magnetization measurements and the influence of different powering conditions was analyzed. 20010123SLAC CERN EDS SIS INSP2001 6937239 SIS:2001 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable INSPEC A2921 (Beams in particle accelerators) INSPEC A2920 (Cyclic accelerators and storage facilities) INSPEC A2915 (Electrostatic and linear particle accelerators) INSPEC B7410B (Particle beam handling and diagnostics) INSPEC B5180F (Solenoids and electromagnets) INSPEC B3240E (Superconducting coils and magnets) INSPEC B8130D (Superconducting power cables) INSPEC B5100 (Electric and magnetic fields) INSPEC NI current: 1 INSPEC accelerator-magnets INSPEC colliding-beam-accelerators INSPEC magnetic-fields INSPEC magnetisation INSPEC superconducting-cables INSPEC superconducting-magnets Haverkamp, M Kuijper, A den Ouden, A ten Haken, B ten Kate, H H J LHC 1609-12 1.2 IEEE Trans. Appl. Supercond. 11 2001 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-454 http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002237265 IEEE Published version, local copy http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-454 Access to fulltext document http://cds.cern.ch/record/483492/files/cer-002237265.pdf IEEE Published version, local copy http://cds.cern.ch/record/483492/files/lhc-project-report-454.pdf Access to fulltext document http://cds.cern.ch/record/483492/files/lhc-project-report-454.ps.gz Access to fulltext document Evelyne.Delucinge@cern.ch CERN Univ. Twente TN/LT, Enschede n 200104 a2001 13 20100901 1605 CER01 20010116 PUBLIC 0001 002237265CER ARTICLE 483493 SzGeCERN 20230531152037.0 oai:cds.cern.ch:483493 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN CERCER 2237266 INSPEC 6937263 CERN annual report 2001-3.2061 SPIRES 4564464 Inspire 540215 LHC-Project-Report-455 eng CERN-LHC-Project-Report-455 Khomenko, B A Statistical Diagnosis Method of Conductor Motions in Superconducting Magnets to Predict their Quench Performance 2001 Geneva CERN 22 Dec 2000 5 p paper Premature training quenches are usually caused by the transient energy released within the magnet coil as it is energised. Two distinct varieties of disturbances exist. They are thought to be electrical and mechanical in origin. The first type of disturbance comes from non-uniform current distribution in superconducting cables whereas the second one usually originates from conductor motions or micro-fractures of insulating materials under the action of Lorentz forces. All of these mechanical events produce in general a rapid variation of the voltages in the so-called quench antennas and across the magnet coil, called spikes. A statistical method to treat the spatial localisation and the time occurrence of spikes will be presented. It allows identification of the mechanical weak points in the magnet without need to increase the current to provoke a quench. The prediction of the quench level from detailed analysis of the spike statistics can be expected. 20010123SLAC CERN EDS SIS INSP2001 6937263 SIS:2001 PR/LKR added SIS ARC-PR-2007 CLAS1 LHC-PROJECT-REPORT SzGeCERN Accelerators and Storage Rings ARTICLE CERN LHCPROJECTREPORT CERN LHC Not applicable INSPEC B3240E (Superconducting coils and magnets) INSPEC B8130D (Superconducting power cables) INSPEC B0240Z (Other topics in statistics) INSPEC current-distribution INSPEC statistical-analysis INSPEC superconducting-cables INSPEC superconducting-coils INSPEC superconducting-magnets Pugnat, P Rijllart, A Sanfilippo, S Siemko, A LHC 1705-8 1.2 IEEE Trans. Appl. Supercond. 11 2001 CERN Depot 4, bldg. 500-S-023 (DE4) CERN-LHC-Project-Report-455 http://documents.cern.ch/cgi-bin/setlink?base=generic&categ=public&id=cer-002237266 IEEE Published version, local copy http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=lhc-project-report-455 Access to fulltext document http://cds.cern.ch/record/483493/files/cer-002237266.pdf IEEE Published version, local copy http://cds.cern.ch/record/483493/files/lhc-project-report-455.pdf Access to fulltext document http://cds.cern.ch/record/483493/files/lhc-project-report-455.ps.gz Access to fulltext document Evelyne.Delucinge@cern.ch CERN n 200104 a2001 13 20100901 1605 CER01 20010116 PUBLIC 002237266CER ARTICLE 0001