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ABSTRACT: KATRIN is the most advanced beta-decay experiment for measuring the rest mass of the neutrino. Within this experiment, the Windowless Gaseous Tritium Source (WGTS) is a sophisticated cryogenic and magnetic system of 16 meter length incorporating in total 21 superconducting solenoid coils and additionally four dipoles surrounding an accurately temperature-stabilized beam tube. The size and complexity of the system requests thorough design both for the magnetic and cryogenic aspects. The design of the system is near completion and the fabrication has started.
IEEE Transactions on Appiled Superconductivity 07/2008; · 1.04 Impact Factor
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ABSTRACT: ACCEL Instruments GmbH [1] has designed, manufactured, assembled, and tested several insertion devices for many synchrotron light sources and free electron lasers around the world. Besides the superconducting (sc) wavelength shifters, sc-wigglers and sc-undulators, ACCEL has entered the pure permanent magnet based insertion device market. The latest progress of the insertion device (ID) group was the production of 6 identical PPM undulators for the SPARC free electron laser (FEL) project in Frascati (Italy), the production of a prototype undulator and an industrial study on large scale undulator production for the European X-FEL project in Hamburg (Germany). ACCEL has signed a know-how and license agreement with the ID group at the ESRF in order to be able to supply customers with high quality insertion devices in short delivery times. Therefore ACCEL has setup a standard ESRF 7 m granite measuring bench. Design issues, measurement techniques, and measurement results will be presented.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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D. Krischel,
C. Baumgarten,
A. Geisler, A. Hobl,
H.-U. Klein,
M. Poier,
H. Rocken,
M. Schillo,
P. vom Stein,
T. Stephani,
J.H. Timmer,
C. Zimmer
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ABSTRACT: Two superconducting cyclotrons have been delivered by ACCEL to produce 250 MeV protons for cancer treatment. Based on a conceptual design of the national superconducting cyclotron laboratory (NSCL) these machines are the first ones of their kind being engineered and built by industry. Application of superconductivity provides better and more reliable beam performance as compared to normal conducting cyclotrons. We present the assessment for applying superconductivity, review the design and assembly, and report on the first year of operation experience with regard to cryogenic and magnetic performance.
IEEE Transactions on Appiled Superconductivity 07/2007; · 1.04 Impact Factor
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ABSTRACT: Superconducting magnets are widely used in ECR ion sources. The intensity and form of the magnetic field plays an important role in the way towards higher performance sources. During the development steps, the design principles and geometries had to be adapted to reach higher fields using state-of-the-art technologies and design tools. Production, assembly, and tests of these superconducting magnets are presented and a short outlook on possible future developments is given.
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS Supp. Jul. 01/2007; 31.
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ABSTRACT: Starting in 2001 ACCEL Instruments GmbH has designed a superconducting cyclotron in collaboration with the National Superconducting Cyclotron Laboratory (NSCL), Michigan, USA, for proton therapy. This design is based on a proposal from NSCL from 1993. Currently two cyclotrons have been built, tested with respect to magnetic and cryogenic performance and delivered to the customer's site. Important issues taken into account when building a machine for medical use as well as design features, operating parameters and results from the in-house tests are presented.
IEEE Transactions on Appiled Superconductivity 07/2005; · 1.04 Impact Factor
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ABSTRACT: New advanced cryogen-free superconducting mini-gap undulators are capable of supplying high-energy photons required by experiments in medium energy storage rings. ACCEL's new cryogen-free superconducting undulators pave the way for these easy-to-use high-field insertion devices. The magnet cold mass is cooled down below 4 K without even intermediate use of any cryogenic agent. The cooling power is provided exclusively by multistage cryocoolers and a sophisticated cryogenic design. The cryogenic concept as well as thermal behavior of the first industrial device delivered in January 2004 will be presented along with the field quality measurements.
IEEE Transactions on Appiled Superconductivity 07/2005; · 1.04 Impact Factor
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American Institute of Physics. 01/2004; 705(1):179.
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American Institute of Physics. 01/2004; 705(1):223.
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ABSTRACT: Undulators in electron/positron accelerators are powerful sources of UV radiation and X-rays. The field-generating elements in classical undulators are either permanent magnets or electromagnets. For undulators with short periods, permanent magnets are used and the field strength (for a given period length and gap) is limited by the material properties. In this paper a novel concept is described which allows these limitations to be overcome by using an in-vacuo undulator with superconductive wires.
IEEE Transactions on Appiled Superconductivity 07/2003; · 1.04 Impact Factor
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ABSTRACT: A large superconducting cryogen-free magnet has been designed, manufactured and tested. The magnet reached 4.1 T in the 430 mm room temperature bore with a ramp time of 35 min. The magnet is cooled by a two-stage GM cryocooler. The magnet can be rotated on a support frame to be operated with either horizontal or vertical bore. The stored energy of 1 MJ can safely be handled during a quench. Homogeneity, cool down as well as quench properties confirmed the design values. The magnet is now being operated by the end user.
IEEE Transactions on Appiled Superconductivity 07/2003; · 1.04 Impact Factor
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ABSTRACT: A High temperature Superconducting Magnetic Energy Storage (HSMES) system has been designed and is being built by ACCEL Instruments GmbH in cooperation with the German companies AEG SVS GmbH, and EUS GmbH, and the utility company E.ON Bayern AG. The magnet is designed for an energy of 150 kJ. The superconducting coil is composed of twenty double pancakes wound of a high temperature superconductor tape with BSCCO-2223 filaments. The coil and the shield are conduction-cooled using a cryocooler; the cryostat is free of cryogens. The current leads are composed of a resistive part and a high temperature superconducting BSCCO-2212 MCP element. The HSMES will be integrated in a 20 kVA uninterruptible power supply (UPS) system coupled to the electrical grid for enhancing the power quality of a selected grid user. The design of the HSMES UPS system is described. A test module composed of two double pancakes wound from pre-series superconductor tapes was manufactured and tested at 77 K in order to check the magnet design and the coil manufacturing technique.
IEEE Transactions on Appiled Superconductivity 07/2003; · 1.04 Impact Factor
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ABSTRACT: During the last few years, prototypes of superconductive undulators have been built and tested. Measurements of the magnetic field showed that both the first and the second field integral are, as expected, not fully compensated and that a small but not negligible phase error exists. In order to compensate for these errors, electric shimming techniques are applied. Integral shimming is already part of the two 14 mm undulators under construction. The electric phase-shimming is still under investigation. At the end of this paper the thermal beam load for a small-gap superconductive undulator is estimated defining the layout of the cooling system.
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the; 06/2003
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ABSTRACT: The main quadrupoles of the Large Hadron Collider (LHC) are connected in families of focusing and defocusing magnets. In order to make tuning corrections in the machine a number of quadrupole corrector magnets (designated MQT) are necessary. These 56 mm diameter aperture magnets have to be compact, with a maximum length of 395 mm and a coil radial thickness of 5 to 7.5 mm, while generating a minimum field gradient of 110 T/m. Two design options have been explored, both using the "counter-winding" system developed at CERN for the fabrication of low cost corrector coils. The first design, with the poles composed of two double-pancake coils, each counter-wound using a single wire, superposed to create 4-layer coils, was developed and built by ACCEL Instruments GmbH. A second design where single coils were counter-wound using a 3-wire ribbon to obtain 6-layer coils was developed at CERN. This paper describes the two designs and reports on the performance of the prototypes during testing.
IEEE Transactions on Appiled Superconductivity 04/2002; · 1.04 Impact Factor
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M. Schillo,
A. Geisler, A. Hobl,
H. U. Klein,
D. Krischel,
M. Meyer-Reumers,
C. Piel,
H. Blosser,
J.-W. Kim,
F. Marti,
J. Vincent,
S. Brandenburg,
J. P. M. Beijers
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ABSTRACT: A cyclotron for proton therapy has to fulfill many requirements set by the specific operational and safety needs of a medical facility and the medical environment. These are for instance high extraction efficiency, high availability and reliability, simple and robust operation. ACCEL Instruments GmbH has refined the design concept of a medical cyclotron for the PSI PROSCAN project with the objective to use this cyclotron as the standard accelerator in complete proton therapy facilities, which ACCEL intends to market. Starting from the design in [1], we have carried out further detail clarifications, optimizations and adaptations to the needs of PSI [2]. The work was performed in a collaboration between ACCEL, NSCL and KVI in view of the requirements from the PSI PROSCAN project. An overview on the design will be given touching on subjects such as the 3D structural analysis of the coil, detailed magnetic modeling for optimization of the inner region and the spiral, optimization of the RF power, optimization of the cryogenic design based on available cryocoolers instead of a liquefaction plant and Monte Carlo simulations to estimate the heat balance produced by neutrons at 4K components. © 2001 American Institute of Physics.
AIP Conference Proceedings. 12/2001; 600(1):37-39.
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J. Lucas,
R. Ostojic,
L. Bottura,
R. Bussjaeger,
H. Dariol, A. Hobl,
D. Krischel,
G. Kirby,
V. Remondino,
S. Sanfilippo,
M. Schillo,
A. Siemko,
F. Sonnemann,
D. Tommasini,
I. Vanenkov,
W. Venturini Delsolaro
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ABSTRACT: The LHC dispersion suppressors and matching sections will be
equipped with individually powered superconducting quadrupoles with an
aperture of 56 mm. In order to optimise the parameters and cost of the
magnets and of their powering, the quadrupole has been designed on the
basis of an 8.2 mm wide Rutherford-type cable for a nominal current of
5300 A, corresponding to a gradient of 200 T/m at 1.9 K. In order to
validate the design two 1-m single-aperture quadrupoles and one
twin-aperture quadrupole have been built and tested. In this report we
describe the construction features of the magnets and present the
results of the magnet tests
IEEE Transactions on Appiled Superconductivity 04/2001; · 1.04 Impact Factor
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ABSTRACT: Superconducting in-vacuo undulators reach higher fields at lower
periods compared to permanent magnet undulators. After the first
successful tests of such an undulator with beam in Mainz and an analysis
of the emitted radiation a team consisting of members of ACCEL and the
Research Center Karlsruhe began to build a superconducting undulator for
the 2.5 GeV storage ring ANKA. In this paper (due to the limited space)
a few aspects of the whole design are described
Particle Accelerator Conference, 2001. PAC 2001. Proceedings of the 2001; 02/2001
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ABSTRACT: Ability to safely withstand and survive self quench conditions is
an important consideration in the design and utilisation of HTS current
leads. The provision of a non superconducting shunt path allows current
to be diverted in the event of a transition to the normal state. This
shunt should allow very rapid transfer of current out of the HTS
material and be able to safely support the full load current for the
time required to detect the fault and reduce the current to zero.
However, the shunt should also be designed to minimise the increased
heat load which will result from it's addition to the lead. Test of
leads based on melt cast BSCCO 2212 utilising a fully integrated silver
gold alloy sheath are described. The HTS sub-elements form part of a
full 13 kA lead, designed to the specifications of CERN for the LHC
project. The sub-elements proved able to fully comply with and exceed
the quench performance required by CERN. The HTS module was quenched at
the full design current and continued to maintain this current for a
further minute in the absence of any coolant without any damage being
incurred or degradation of subsequent performance. Results were in full
agreement with calculated quench performance. Work continues on similar
modules for a 600 A lead
IEEE Transactions on Appiled Superconductivity 04/2000; · 1.04 Impact Factor
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ABSTRACT: A low temperature 2 MJ SMES is being built for an uninterruptible
power supply. The superconducting magnet is designed for a carry over
time of 8 s at a mean power of 200 kW. The maximum power of the SMES is
800 kW at an operating current of 1 kA. The magnet is being built as a
liquid helium bath cooled solenoid. The cryogenic system is designed for
no boil-off operation and cryocoolers are used for recondensation of the
evaporated helium. Low cryogenic losses are achieved by the use of
HTS-current leads, AC losses of the magnet are reduced by using a mixed
matrix Cu/CuNi/NbTi superconductor. The SMES is connected to the power
electronic of the UPS by a chopper circuit and a DC link capacitor. This
paper describes the system design and focuses on the superconducting
magnet
IEEE Transactions on Appiled Superconductivity 04/2000; · 1.04 Impact Factor
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ABSTRACT: The authors have designed, fabricated and integrated HTSC current
leads in the range from a few ten to several hundred amperes in advanced
magnets being in operation for many years now without failure of the
leads. Their design experience is transferred into the prototype work
for 13 kA leads for the main magnets of the LHC accelerator at
CERN
IEEE Transactions on Appiled Superconductivity 07/1999; · 1.04 Impact Factor
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ABSTRACT: We review the design, fabrication, and test of the coldmass of the superconducting hexapole/solenoid for the source SERSE (superconducting electron cyclotron resonance source) built in a joint venture between INFN, Catania, and CEA/DRFMC, Grenoble. Following the magnetic field specifications we did the optimization of coil shape and positioning to keep the induction in the coil heads at the necessary minimum. The forces acting on the coil heads due to the combined hexapole/solenoid field nevertheless are of highly complex structure. Therefore special attention was given to the structural analysis including 3D coil head simulations. According to ACCEL’s experience with s.c. wigglers and wavelength shifters the 700 mm long racetrack coils were imbedded into a stainless steel structure being completed by a set of structural wedges and shrink rings. After assembling of the quench protection diodes the magnet has been cold tested in a temporary cryostat and after a reasonable number of quenches it achieved all levels of performance for the axial profiles and the hexapolar field specified by INFN. Subsequently the training was continued to the exceptional maximum field of 1.54 T at the position of the plasma chamber wall (radius 65 mm), which is 10% above specification. The completed coldmass has been integrated into its final cryostat and is being tested at CEA. © 1998 American Institute of Physics.
Review of Scientific Instruments 03/1998; · 1.37 Impact Factor
