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Design Study of a Superconducting Insertion Quadrupole Magnet for the Large Hadron Collider
/ Kirby, G A ; Ostojic, R ; Taylor, T M ; Yamamoto, A ; Tsuchiya, K ; Higashi, N ; Nakamoto, T ; Ogitsu, T ; Ohuchi, N ; Shintomi, T et al.
The conceptual design study of a high gradient super conducting insertion quadrupole magnet has been carried out in collaboration between KEK and CERN for the Large Hadron Collider (LHC) to be built at CERN. [...]
LHC-Project-Report-75 ; CERN-LHC-Project-Report-75.
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1997. - 5 p.
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Boundary-induced coupling currents in a 1.3 m Rutherford-type cable due to a locally applied field change
/ Verweij, A P ; Oomen, M P ; ten Kate, H H J
In this paper the existence of so called Boundary-Induced Coupling Currents (BICCs) is experimentally demonstrated in a 1.3 m long Rutherford-type cable. These BICCs are induced by applying a field change locally onto the cable and can be represented by a non-uniform current distribution between the strands of the cable during and after the field sweep. [...]
LHC-Project-Report-74; CERN-LHC-Project-Report-74.-
Geneva : CERN, 1996 - 4 p.
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In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.270-273
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6.
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Rutherford cables with anisotropic transverse resistance
/ Adam, J D ; Leroy, D ; Oberli, L R ; Richter, D ; Wilson, M N ; Wolf, R ; Higley, H C ; McInturff, A D ; Scanlan, R M ; Nijhuis, A et al.
Putting a resistive core into the center of a Rutherford cable increases resistance between strands in the crossover direction, which greatly reduces the coupling currents, even when the resistance to adjacent turns remains small. This allows one to improve stability by soldering strands together or using porous metal, without incurring a penalty of increased coupling. [...]
LHC-Project-Report-65; CERN-LHC-Project-Report-65.-
Geneva : CERN, 1996 - 4 p.
- Published in : IEEE Trans. Appl. Supercond. 7 (1997) 958-961
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In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.958-961
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7.
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Determination of interstrand contact resistance from loss and field measurements in LHC dipole prototypes and correlation with measurements on cable samples
/ Wolf, R ; Leroy, D ; Richter, D ; Verweij, A P ; Walckiers, L
Loss and field errors due to ramping in LHC accelerator dipole magnets are mainly determined by the contact resistance between the strands of the magnet cable. It is therefore important to develop cables having sufficiently high contact resistance in the magnets in order to ease operation of the future LHC collider during ramping. [...]
LHC-Project-Report-64; CERN-LHC-Project-Report-64.-
Geneva : CERN, 1996 - 4 p.
Access to fulltext document: PDF TIF;
In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.797-800
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9.
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Examination of contacts between strands by electrical measurements and topographical analysis
/ Depond, J M ; Leroy, D ; Oberli, L R ; Richter, D
The contact resistance (crossing and adjacent) between the strands of Rutherford type superconducting cables has been proven to be an essential parameter for the behaviour of the main magnets in accelerators like the LHC. A strong development program has been launched at CERN. [...]
LHC-Project-Report-72; CERN-LHC-Project-Report-72.-
Geneva : CERN, 1996 - 4 p.
Access to fulltext document: PDF;
In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.793-796
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10.
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DC measurement of electrical contacts between strands in superconducting cables for the LHC main magnets
/ Richter, D ; Adam, J D ; Depond, J M ; Leroy, D ; Oberli, L R
In the LHC main magnets, using Rutherford type cable, the eddy current loss and dynamic magnetic field error depend largely on the electrical resistance between crossing (Rc) and adjacent (Ra) strands. Cables made of strands with pre-selected coatings have been studied at low temperature using a DC electrical method. [...]
LHC-Project-Report-67; CERN-LHC-Project-Report-67.-
Geneva : CERN, 1996 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 7 (1997) 786-792
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In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.786-792
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11.
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Design of the 70 mm twin aperture superconducting quadrupole for the LHC dump insertion
/ Kirby, G A ; Ostojic, R ; Taylor, T M ; Trinquart, G
The LHC dump insertion features a pair of superconducting quadrupoles located on either side of a 340 m long straight section. Two horizontally deflecting kickers, located in between the quadrupole pairs, and a septum in the centre of the insertion, vertically deflect the two counter-rotating beams past the quadrupoles on the downstream sides, and into the dump areas. [...]
LHC-Project-Report-66; CERN-LHC-Project-Report-66.-
Geneva : CERN, 1996 - 4 p.
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In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.562-565
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12.
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Quench localization and current redistribution after quench in superconducting dipole magnets wound with Rutherford-type cables
/ Jongeleen, S ; Leroy, D ; Siemko, A ; Wolf, R
Quench development is studied for the first few milliseconds after the start of a quench with the help of voltage taps and pickup coils in the LHC accelerator dipole models. The reliability of the pickup coil method (the so called quench antenna) is discussed. [...]
LHC-Project-Report-59; CERN-LHC-Project-Report-59.-
Geneva : CERN, 1996 - 4 p.
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In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.179-182
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13.
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Field Errors Decay and "Snap-Back" in LHC Model Dipoles
/ Bottura, L ; Walckiers, L ; Wolf, R
The magnetic field in accelerator magnets decays when the current is kept constant during the particles injection phase, and returns quickly (snaps back) to the original values as soon as ramping is restarted. Here we show results of measurements of the decay of the field errors in 10 m long LHC model dipole magnets. [...]
LHC-Project-Report-55; CERN-LHC-Project-Report-55.-
Geneva : CERN, 1996 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 7 (1997) 602-605
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In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.602-605
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14.
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Experimental Evidence of Boundary Induced Coupling Currents in LHC Prototypes
/ Bottura, L ; Walckiers, L ; Ang, Z
The field quality of 10 m long LHC dipole models has been measured with short rotating coils to explore its dependence on time and position. Multipoles exhibit a longitudinal periodic variation, with period equal to the twist pitch length [...]
LHC-Project-Report-54; CERN-LHC-Project-Report-54.-
Geneva : CERN, 1996 - 5 p.
Access to fulltext document: PDF;
In : Applied Superconductivity Conference : ASC '96, pt.1-3, Pittsburgh, PA, USA, 25 - 30 Aug 1996, pp.801-804
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