Hi-Lumi LHC Twin-Aperture Orbit Correctors Magnet System Optimisation

The HL-LHC project is an upgrade of the LHC that requires double aperture dipole correctors. In 2015, CERN selected Canted Cos-Theta (CCT) magnet, and the development of the MCBRD magnets followed. Since then, a prototype (P1) has been built and measured at CERN, and quench results agree with simulations. In 2017, China joined the programme with in-kind prototypes and twelve (four spares) series magnets with WST, IMP, IHEP, and BAMA efforts. The first MCBRD magnet built in China is the second prototype (P2) of the programme. This magnet was subjected to triggered energy extractions at CERN magnet test facility. The energy extraction is used for magnet protection, keeping voltage-to-ground and hot-spot temperature below 560 V and 250 K, respectively. A high magnetic-field change rate during the magnet discharge from high currents causes a substantial quench-back due to the heat generated by the eddy currents in the magnet formers. A specialized software, ProteCCT, was developed as part of the STEAM project to simulate such a unique quench behaviour. This contribution focuses on comparing measured results between the P1 and P2 magnets, and P2 quench measurement and simulation results. The correction factors available in the ProteCCT software allow matching the measured results. We identify measurements needed to refine simulation inputs further and improve the simulation predictive capability.

Section: Mcbrd Magnetmentioning

confidence: 99%

Quench Behavior of Prototype Nb-Ti HL-LHC Dipole Canted Cos-Theta Orbit Corrector Magnets

Woźniak

Ravaioli

Mangiarotti

et al. 2022

“…Then the collaboration is committed to designing, manufacturing and testing one magnet demonstrator. We plan to assess various options among conductors: LTS (Nb-Ti and Nb3Sn), HTS (REBCO, Bi-2212), MgB2 and among coil layouts: CosineTheta (CT), Canted Cosine Theta (CCT) [13] or race-track (RT). However, for design and construction of a prototype the collaboration has chosen as provisional baseline Nb-Ti wound as CCT, conduction cooled with impregnation.…”

Section: ) Objectives Of Hitriplus Wp8mentioning

confidence: 99%

A European Collaboration to Investigate Superconducting Magnets for Next Generation Heavy Ion Therapy

Rossi¹,

Ballarino

Barna

et al. 2022

Next generation ion therapy magnets both for gantry and for accelerator (synchrotron) are under investigation in a recently launched European collaboration that, in the frame of the European H2020 HITRIplus and I.FAST programmes, has obtained some funding for work packages on superconducting magnets. Design and technology of superconducting magnets will be developed for ion therapy synchrotron and -especially-gantry, taking as reference beams of 430 MeV/nucleon ions (C-ions) with 10 10 ions/pulse. The magnets are about 60-90 mm diameter, 4 to 5 T peak field with a field change of about 0.3 T/s and good field quality. The paper will illustrate the organization of the collaboration and the technical program. Various superconductor options (LTS, MgB2 or HTS) and different magnet shapes, like classical CosTheta or innovative Canted CosTheta (CCT), with curved multifunction (dipole and quadrupole), are under evaluation, CCT being the baseline. These studies should provide design inputs for a new superconducting gantry design for existing facilities and, on a longer time scale, for a brand-new hadron therapy centre to be placed in the South East Europe (SEEIIST project).

“…The starting point of the simulations is based on the work already realized at CERN [8]. The initial work was realized using MATLAB and the toolbox Magnetic field of modulated double helical coils [9].…”

Section: Simulationsmentioning

confidence: 99%

Design of a Canted-Cosine-Theta Orbit Corrector for the High Luminosity LHC

Pépitone

Kirby

Ruber

et al. 2022

Self Cite

The High Luminosity LHC requires dipole orbit correctors grouped in double aperture magnet assemblies. They provide a field of 3.1 T at 100 A in an aperture of 70 mm. The current standard design is a classical cosine-theta layout made with ribbon cable. However, the electric insulation of the ribbon cable is not radiation-resistant enough to withstand the radiation load expected in the coming years of LHC operation. A new design, based on a radiation-resistant cable with polyimide insulator, that can replace the existing orbit correctors at their end-of-life, is needed. The challenge is to design a magnet that fits directly into the existing positions and that can operate with the same busbars, passive quench protection, and power supplies as existing magnets. We propose a self-protected canted-cosine-theta (CCT) design. We take the opportunity to explore new concepts for the CCT design to produce a cost-effective and high-quality design with a more sustainable use of resources. The new orbit corrector design meets high requirements on the field quality while keeping within the same mechanical volume and maximum excitation current.A collaboration of Swedish universities and Swedish industry has been formed for the development and production of a prototype magnet following a concurrent engineering (CE) methodology to reduce the time needed to produce a functional CCT magnet. The magnet has a 1 m long CCT dipole layout consisting of two coils. The superconductor is a commercially available 0.33 mm wire with polyimide insulation in a 6-around-1 cable. The channels in the coil formers, that determine the CCT layout, allow for 2 × 5 cable layers. A total of 70 windings makes that the coil current can be kept below 100 A. We will present the detailed design and preliminary quench simulations.