The MICE coupling coil is fabricated from Nb-Ti, which has high quench propagation velocities within the coil in all directions compared to coils fabricated with other superconductors such as niobium tin. The time for the MICE coupling coil to become fully normal through normal region propagation in the coil is shorter than the time needed for a safe quench (as defined by a hot-spot temperature that is less than 300 K). A MICE coupling coil quench was simulated using a code written at the Institute of Cryogenics and Superconductive Technology (ICST) at the Harbin Institute of Technology (HIT). This code simulates quench back from the mandrel as well as normal region propagation within the coil. The simulations included sub-division of the coil. Each sub-division has a back to back diodes and resistor across the coil. Current flows in the resistor when there is enough voltage across the coil to cause current to flow through the diodes in the forward direction. The effects of the number of coil sub-divisions and the value of the resistor across the subdivision on the quench were calculated with and without quench back. Sub-division of the coupling coil reduces the peak voltage to ground, the layer-to-layer voltage and the magnet hot-spot temperature. Quench back reduces the magnet hot-spot temperature, but the peak voltage to ground and layer-to-layer voltage are increased, because the magnet quenches faster. The resistance across the coil sub-division affects both the hot-spot temperature and the peak voltage to ground.
Abstract-The RF coupling coil (RFCC) module of MICE is where muons that have been cooled within the MICE absorber focus (AFC) modules are re-accelerated to their original longitudinal momentum. The RFCC module consists of four 201.25 MHz RF cavities in a 1.4 meter diameter vacuum vessel. The muons are kept within the RF cavities by the magnetic field generated by a superconducting coupling solenoid that goes around the RF cavities. The coupling solenoid will be cooled using a pair of 4 K pulse tube cooler that will generate 1.5 W of cooling at 4.2 K. The magnet will be powered using a 300 A twoquadrant power supply. This report describes the ICST engineering design of the coupling solenoid for MICE.
We present an updated design for a proposed source of ultra-fast synchrotron radiation pulses based on a recirculating superconducting linac [1,2], in particular the incorporation of EUV and soft x-ray production. The project has been named LUX -Linac-based Ultrafast X-ray facility. The source produces intense x-ray pulses with duration of 10-100 fs at a 10 kHz repetition rate, with synchronization of 10's fs, optimized for the study of ultra-fast dynamics. The photon range covers the EUV to hard x-ray spectrum by use of seeded harmonic generation in undulators, and a specialized technique for ultra-shortpulse photon production in the 1-10 keV range. Highbrightness rf photocathodes produce electron bunches which are optimized either for coherent emission in freeelectron lasers, or to provide a large x/y emittance ration and small vertical emittance which allows for manipulation to produce short-pulse hard x-rays. An injector linac accelerates the beam to 120 MeV, and is followed by four passes through a 600-720 MeV recirculating linac. We outline the major technical components of the proposed facility.
Abstract-The superconducting coupling solenoid to be applied in the Muon Ionization Cooling Experiment (MICE) is made from copper matrix Nb-Ti conductors with inner radius of 750 mm, length of 285 mm and thickness of 102.5 mm at room temperature. The magnetic field up to 2.6 T at the magnet centerline is to keep the muons within the MICE RF cavities. Its self inductance is around 592 H and its magnet stored energy is about 13 MJ at a full current of 210 A for the worst operation case of the MICE channel. The stress induced inside the coil during cool down and charging is relatively high. Two test coils are to build and test in order to validate the design method and develop the fabrication technique required for the coupling coil winding, one is 350 mm inner diameter and full length same as the coupling coil, and the other is one-quarter length and 1.5 m diameter. The 1.5 m diameter coil will be charged to strain conditions that are greater than would be encountered in the coupling coil. This paper presents detailed design of the test coils as well as developed winding skills. The analyses on stress in coil assemblies, AC loss, and quench process are carried out.
Abstract-By various theorems one can relate the capital cost of superconducting magnets to the magnetic energy stored within that magnet. This is particularly true for magnet where the cost is dominated by the structure needed to carry the magnetic forces. One can also relate the cost o f the magnet to the product o f the magnetic induction and the field volume. The relationship used to estimate the cost the magnet is a function o f the type of magnet it is. This paper updates the cost functions given in two papers that were published in the early 1990's. The costs (escalated to 2007 dollars) of large numbers o f LTS magnets are plotted against stored energy and magnetic field time field volume. Escalated costs for magnets built since the early 1990's are added to the plots.
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