High temperature Superconductors (HTS) have the potential to change the design and operation of future particle accelerators beginning with the design of high performance interaction regions. HTS ...offers two distinct advantages over conventional Low Temperature Superconductors (LTS)-they retain a large fraction of their current carrying capacity a) at high fields and b) at elevated temperatures. The Superconducting Magnet Division at Brookhaven National Laboratory (BNL) has embarked on a new R&D program for developing technology needed for building accelerator magnets with HTS. We have adopted a "React & Wind" approach to deal with the challenges associated with the demanding requirements of the reaction process. We have developed several "conductor friendly" designs to deal with the challenges associated with the brittle nature of HTS. We have instituted a rapid turn around program to understand and to develop this new technology in an experimental fashion. Several R&D coils and magnets with HTS tapes and "Rutherford" cables have been built and tested. We have recently performed field quality measurements to investigate issues related to the persistent currents. In this paper, we report the results to date and plans and possibilities for the future.
Although the process of spermatogenesis is relatively efficient and resistant to damage, male infertility can result from exposure to toxic agents such as chemotherapeutic regimes, radiation, or ...occupational exposures to chemicals. Other types of infertility may result from migratory defects or poor survival of primordial germ cells during development, abnormal repopulation of the tubules by spermatogonia during development, or low cellularity of the testis (hypospermatogenesis). Presently, there are no effective therapies available to treat these patients. Recent studies in animal models have demonstrated that isolated testicular germ cells collected from testes may be transplanted into sterile recipient mice to regenerate spermatogenesis. This technology will have widespread applications in efforts to manipulate the genome and produce transgenic offspring, to improve agricultural species, to enhance sperm production in endangered species, to improve our understanding of the control mechanisms regulating spermatogenesis, and to treat male infertility.
The Superconducting Magnet Division at Brookhaven National Laboratory (BNL) is building 20 insertion region dipoles of various types for the Large Hadron Collider (LHC) at CERN. These 9.45 m-long, 8 ...cm aperture magnets use the same coil design as the arc dipoles for the Relativistic Heavy Ion Collider (RHIC) at BNL. The most challenging of these dipoles are the twin aperture magnets. The two apertures are separated by 188 to 234 mm, and the dipole fields in both the apertures point in the same direction. In order to test the design and determine various operating parameters of these magnets, two three m-long prototypes were built and tested at BNL. Tests were done to measure spontaneous quench performance, conductor temperature at quench, coil stress behavior during cool-downs, warm-ups and excitation ramps, and quench protection heater performance. Extensive magnetic field measurements were done with a 3.58-meter long integral coil, as well as a one-meter long coil at the axial center of the magnet. Dynamic effects, such as time decay and snapback at injection, and harmonics due to cable magnetization and eddy currents were studied with a time resolution of 2 s.
Common coil magnet program at BNL Gupta, R.; Anereila, M.; Cozzolino, J. ...
IEEE transactions on applied superconductivity,
03/2001, Letnik:
11, Številka:
1
Journal Article, Conference Proceeding
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The goal of the common coil magnet R&D program at Brookhaven National Laboratory (BNL) is to develop a 12.5 T, 40 mm aperture dipole magnet using "react and wind technology" with high temperature ...superconductors (HTS) playing a major role. Due to its "conductor friendly" nature, the common coil design is attractive for building high field 2-in-1 dipoles with brittle materials such as HTS and Nb/sub 3/Sn. At the current rate of development, it is expected that a sufficient amount of HTS with the required performance would be available in a few years for building a short magnet. In the interim, the first generation dipoles will be built with Nb/sub 3/Sn superconductor. They will use a "react and wind" technology similar to that used in HTS and will produce a 12.5 T central field in a 40 mm aperture. The Nb/sub 3/Sn coils and support structure of this magnet will become a part of the next generation hybrid magnet with inner coils made of HTS. To develop various aspects of the technology in a scientific and experimental manner, a 10-turn coil program has been started in parallel. The program allows a number of concepts to be evaluated with a rapid throughput in a cost-effective way. Three 10-turn Nb/sub 3/Sn coils have been built and one HTS coil is under construction. The initial test results of this "react and wind" 10-turn coil program are presented. It is also shown that a common coil magnet design can produce a field quality that is as good as a conventional cosine theta design.
The first of a series of 90 cm long racetrack shaped coils has been tested at 77 K and 4.2 K in a common coil configuration. The conductor used was selected from a number of available lengths by ...testing in liquid nitrogen in pancake form. The performance of this coil is compared with shorter versions fabricated from similar conductor.
A support structure for the 120 mm Nb3Sn quadrupole magnet is presently under development for use in the upgrade for LHC at CERN. The design aims to build on existing technology developed in LARP ...with the LQ and HQ magnets and to further optimize the features required for operation in the accelerator. The structure and the proposed assembly methods include features for maintaining mechanical alignment of the coils to achieve the required field quality. It also includes a helium containment vessel and provisions for cooling with 1.9 K helium. The development effort includes the assembly of a 15 cm model to verify required coil load is achieved. Status of the R&D effort and an update on the magnet design, including its incorporation into the design of a complete one meter long cold mass is presented.
High temperature superconductors (HTS) have the potential to change the design and operation of future particle accelerators beginning with the design of high performance interaction regions. HTS ...offers two distinct advantages over conventional low temperature superconductors (LTS)-they retain a large fraction of their current carrying capacity (a) at high fields and (b) at elevated temperatures. The Superconducting Magnet Division at Brookhaven National Laboratory (BNL) has embarked on a new R & D program for developing technology needed for building accelerator magnets with HTS. We have adopted a "React and Wind" approach to deal with the challenges associated with the demanding requirements of the reaction process. We have developed several "conductor friendly" designs to deal with the challenges associated with the brittle nature of HTS. We have instituted a rapid turn around program to understand and to develop this new technology in an experimental fashion. Several R & D coils and magnets with HTS tapes and "Rutherford" cables have been built and tested. We have recently performed field quality measurements to investigate issues related to the persistent currents. In this paper, we report the results to date and plans and possibilities for the future.
The truck transporting the MQXFA11 magnet from LBNL to BNL was involved in an accident on 7/20/22. It was rear ended by another truck. The magnet arrived at FNAL on July 28th. Upon arrival a visual ...inspection was performed. Accelerometers were removed and shock data were analyzed. Electrical checkout and a metrology survey were carried out. Strain data were also collected from the fiber optics installed on two coils and compared with data obtained before shipment. This report presents a summary of results
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