176 research outputs found
Radiation effects in a muon collider ring and dipole magnet protection
The requirements and operating conditions for a Muon Collider Storage Ring
(MCSR) pose significant challenges to superconducting magnets. The dipole
magnets should provide a high magnetic field to reduce the ring circumference
and thus maximize the number of muon collisions during their lifetime. One
third of the beam energy is continuously deposited along the lattice by the
decay electrons at the rate of 0.5 kW/m for a 1.5-TeV c.o.m. and a luminosity
of 1034 cm-2s-1. Unlike dipoles in proton machines, the MCSR dipoles should
allow this dynamic heat load to escape the magnet helium volume in the
horizontal plane, predominantly towards the ring center. This paper presents
the analysis and comparison of radiation effects in MCSR based on two dipole
magnets designs. Tungsten masks in the interconnect regions are used in both
cases to mitigate the unprecedented dynamic heat deposition and radiation in
the magnet coils.Comment: 3 pp. Particle Accelerator, 24th Conference (PAC'11) 28 Mar - 1 Apr
2011: New York, US
Conceptual designs of dipole magnet for muon collider ring
Conceptual designs of a superconducting dipole magnet for a Storage Ring of a
Muon Collider with a 1.5 TeV center of mass (c.o.m.) energy and an average
luminosity of 10 34 cm-2s-1 are presented. In contrast to proton machines, the
dipoles for the Muon Collider should be able to handle ~0.5 kW/m of dynamic
heat load from the muon beam decays. The magnets are based on Nb3Sn
superconductor and designed to provide an operating field of 10 T in the 20-mm
aperture with the critical current margin required for reliable machine
operation. The magnet cross-sections were optimized to achieve the best
possible field quality in the aperture occupied by beams. The developed
mechanical structures provide adequate coil prestress and support at the
maximum level of Lorentz forces in the coil. Magnet parameters are reported and
compared with the requirements.Comment: 4 pp. Applied Superconductivity Conference (ASC 2010), 1-6 Aug 2010:
Washington, D.
Experimental results and analysis from the 11 T Nb3Sn DS dipole
FNAL and CERN are developing a 5.5-m-long twin-aperture Nb3Sn dipole suitable
for installation in the LHC. A 2-m-long single-aperture demonstrator dipole
with 60 mm bore, a nominal field of 11 T at the LHC nominal current of 11.85 kA
and 20% margin has been developed and tested. This paper presents the results
of quench protection analysis and protection heater study for the Nb3Sn
demonstrator dipole. Extrapolations of the results for long magnet and
operation in LHC are also presented.Comment: 10 pages, Contribution to WAMSDO 2013: Workshop on Accelerator
Magnet, Superconductor, Design and Optimization; 15 - 16 Jan 2013, CERN,
Geneva, Switzerlan
Design and Assembly of a Large-aperture Nb3Sn Cos-theta Dipole Coil with Stress Management in Dipole Mirror Configuration
The stress-management cos-theta (SMCT) coil is a new concept which has been
proposed and is being developed at Fermilab in the framework of US Magnet
Development Program (US-MDP) for high-field and/or large-aperture accelerator
magnets based on low-temperature and high-temperature superconductors. The SMCT
structure is used to reduce large coil deformations under the Lorentz forces
and, thus, the excessively large strains and stresses in the coil. A
large-aperture Nb3Sn SMCT dipole coil has been developed and fabricated at
Fermilab to demonstrate and test the SMCT concept including coil design,
fabrication technology and performance. The first SMCT coil has been assembled
with 60-mm aperture Nb3Sn coil inside a dipole mirror configuration and will be
tested separately and in series with the insert coil. This paper summarizes the
large-aperture SMCT coil design and parameters and reports the coil fabrication
steps and its assembly in dipole mirror configuration
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