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ABSTRACT: We present the concept design of the cryogenic feedbox for the superconducting dipole and quadrupole/multi-pole magnets of the Super-FRS (FRagment Separator) project. It also includes the warm gas control and management, the instrumentation and the control logic related with different operation modes of the magnet cooling. As one of the most important trip scenarios for cryogenic facilities, the over pressure in the magnet helium vessel caused by quench has been simulated for a prototype dipole. For safety reason, the safety relief valve and its sizing have also been taken into account.
IEEE Transactions on Appiled Superconductivity 07/2010; · 1.04 Impact Factor
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ABSTRACT: The FAIR China Group (FCG), consisting of the Institute of Modern Physics (IMP Lanzhou), the Institute of Plasma Physics (ASIPP, Hefei) and the Institute of Electric Engineering (IEE, Beijing) developed and manufactured in cooperation with GSI, Germany a prototype of a superferric dipole for the Super-Fragment-Separator of the FAIR-project. The dipole magnets of the separator will have a deflection radius of 12.5 m, a field up to 1.6 T, a gap of at least 170 mm and an effective length of more than 2 meters to bend ion beams with a rigidity from 2 T ?? m up to 20 T ?? m. The magnets operate at DC mode. These requirements led to a superferric design with a yoke weight of more than 50 tons and a maximum stored energy of more than 400 kJ. The principles of yoke, coil and cryostat construction will be presented. We will also show first results of tests and measurements realized at ASIPP and at IMP.
IEEE Transactions on Appiled Superconductivity 07/2010; · 1.04 Impact Factor
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S. Kozub,
I. Bogdanov,
V. Pokrovsky,
A. Seletsky,
P. Shcherbakov,
L. Shirshov,
V. Smirnov,
V. Sytnik,
L. Tkachenko,
V. Zubko, E. Floch,
G. Moritz,
H. Mueller
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ABSTRACT: FAIR (Facility for Antiproton and Ion Research), planned to be built at the site of GSI will include the 300 Tm fast-ramping heavy ion synchrotron SIS 300. In the frame of a collaboration between IHEP (Protvino, Russia) and GSI (Darmstadt, Germany) IHEP developed, produced and tested a superconducting model dipole. The main parameters of the dipole are a two-layer coil, 100 mm inner coil diameter and 1 m length. The magnet is designed for 6 T central magnetic field with a 1 T/s operating field ramp rate. The nominal operating current of 6720 A (6 T central magnetic field) was reached after the third quench and critical current of 7738 A (6.8 T central magnetic field) was reached after the eighteenth quench. The critical current of the dipole did not reduce up to ramp rate of 1300 A/s (1.15 T/s). AC losses for different magnetic field cycles were measured too.
IEEE Transactions on Appiled Superconductivity 07/2010; · 1.04 Impact Factor
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ABSTRACT: Various models for the main dipole of the SIS 300 have been manufactured by GSI and Brookhaven (GSI001), IHEP (a 1 m long 6 T model magnet currently under construction) and INFN (a 4.5 T curved magnet for the actual FODO lattice, also under construction). These different magnets reflect the design changes of the SIS 300 over the recent years. Based on the current lattice design studies for the main quadrupoles were started at GSI. In the presentation the actual status of the work on these magnets will be reviewed. Magnetic field quality, AC losses and quench protection aspects of the current design will be addressed.
IEEE Transactions on Appiled Superconductivity 07/2009; · 1.04 Impact Factor
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ABSTRACT: The international FAIR project planned next to G.S.I. (Germany) will lead to the construction of two superconducting synchrotrons (SIS100 and SIS300). This article reports on the quench calculations and measurements performed on one short SIS100 dipole model (1.4 m), the first to be tested at the FAIR prototype test facility. Quench propagation velocities and time to reach the 0.2 V quench threshold were measured in the bus bars and compared to computed values. The hotspot temperature was measured for different Miits (integral of I<sup>2</sup> .dt) values at 6 and 8 kA and compared to temperatures computed with the Miits equation. This article also reports the use of one inductive spot heater.
IEEE Transactions on Appiled Superconductivity 07/2009; · 1.04 Impact Factor
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ABSTRACT: The New Experimental Storage Ring (NESR) at the FAIR facility in GSI, will be used to manipulate radioactive ion and antiproton beams. For this ring, there is the possibility of using warm iron superferric dipoles. These dipoles are required to operate in AC mode. ELYTT Energy S.L. has worked with GSI, through collaboration with the Spanish CSIC to perform a conceptual design of these magnets. The most challenging task is to design the coil cryostat and the coil pack so that the eddy current losses are minimized under AC operation.
IEEE Transactions on Appiled Superconductivity 07/2007; · 1.04 Impact Factor
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ABSTRACT: The synchrotron SIS 300, developed for the Facility for Antiproton and Ion Research (FAIR) project at GSI, will use fast-cycling dipoles with 100 mm inner diameter coils, magnetic field amplitude of 6 T and a ramp rate of 1 T/s. This work presents the calculations of the magnetic and thermal characteristics of a 1 m model dipole with optimized 2D and 3D geometries. AC losses in the coil and iron yoke, as well as temperature margins, were analyzed. Production tolerances for the main geometrical parameters were also studied.
IEEE Transactions on Appiled Superconductivity 07/2007; · 1.04 Impact Factor
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ABSTRACT: The series tests performed on the LHC superconducting magnets at cryogenic condition give a unique opportunity to understand the mechanisms responsible for the instabilities causing the so-called training quenches. The first series production tests demonstrated that the weak points in the LHC dipoles are the coil extremities in which the majority of the quenches are located. This evidence triggered the idea of improving the resolution of the measuring system to better characterize the starting region of a quench and the beginning of its propagation. The new quench antennas equipped with sets of small, 4 cm long, and sensitive pick-up coils were designed. The system is described in detail and the first measurement results are presented. It turned out that this tool is also a reliable technique for measuring the quench propagation velocity especially in the particular regions of the superconducting coils like the crossing between the straight section of the magnet and its extremity.
IEEE Transactions on Appiled Superconductivity 07/2005; · 1.04 Impact Factor
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ABSTRACT: Applications such as superconducting pulsed power transformers and fault current limiters require high propagation velocities and numerous quench starting points appearing in a short time interval (typically less than a millisecond). A few years ago, Alstom successfully tested a 500-J superconducting pulsed power transformer . In order to better model its quick transition to the normal state, an appropriate computer code was created. This paper presents this quench program and the experiment developed to validate it. The experimental set-up enabled to measure propagation velocities up to 1.1 km/s, which to our knowledge are the highest ever published. Furthermore, we took the opportunity to test a new magnetic quench inducing system. The latter revealed the possibility of inducing a quench in a few tenths of microseconds with an energy consumption at least ten times lower than a classical quench heater.
IEEE Transactions on Appiled Superconductivity 07/2005; · 1.04 Impact Factor
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A. Siemko,
O. Berrig,
L. Bottura,
M. Buzio,
V. Chohan, E. Floch,
V. Granata,
M. Pojer,
P. Pugnat,
L. Rossi,
S. Sanfilippo,
N. Smirnov,
J. Vlogaert,
L. Walckiers
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ABSTRACT: The preseries production of the LHC main superconducting dipoles is presently being tested at CERN. The foremost features of these magnets are: twin structure, six block two layer coils wound from 15.1 mm wide graded NbTi cables, 56 mm aperture, polyimide insulation and stainless steel collars. The paper reviews the main test results of magnets tested to day in both normal and superfluid helium. The results of training performance, magnet protection, electrical integrity and the field quality are presented in terms of the specifications and expected performance of these magnets in the future accelerator.
IEEE Transactions on Appiled Superconductivity 07/2004; · 1.04 Impact Factor
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ABSTRACT: The aim of this work is to prove the feasibility of pulses through
the use of a power transformer. This article presents the design and
tests of a 500 J pulsed power transformer. This paper also describes the
computer code created to simulate the primary quench development. During
the tests, the primary winding was charged to its rated current (500 A).
The secondary being connected to a 0.7 mΩ and 0.2 μH load, we
obtained through this load a pulsed discharge of 7.2 ms duration. The
current rose to 12.3 kA in 0.5 ms and 38% of the energy stored in the
primary winding was transferred to the load. This current and energy
transfer between primary and secondary is the best one ever recorded for
such a device
IEEE Transactions on Appiled Superconductivity 07/1999; · 1.04 Impact Factor
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The European Physical Journal Applied Physics 03/1998; 2(01):17 - 25. · 0.77 Impact Factor
