| Paper |
Title |
Page |
| TUPD002 |
Development of an Eddy Current Septum for LINAC4
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1434 |
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- M. J. Barnes, B. Balhan, J. Borburgh, T. Fowler, B. Goddard, W. J.M. Weterings
CERN, Geneva
- A. Ueda
KEK, Ibaraki
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The bump for the new PS Booster injection from the future Linac4 will be made up of a set of four pulsed dipole magnets; the first of these (BS1) must act as a septum with a thin element dividing the high-field region of the circulating beam from the field-free region through which the injected H- beam must pass. BS1 will provide a deflection of 66 mrad at 160 MeV; this will be achieved with a peak field of 630 mT and a length of 200 mm. The field must rise and fall in 40 microseconds and have a flattop of up to 120 microseconds. The ripple of the flattop should be below ±1%. This paper discusses the design of an eddy current septum for BS1.
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| TUPD003 |
Upgrading the Fast Extraction Kicker System in SPS LSS6
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1437 |
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- M. J. Barnes, L. Ducimetière, B. Goddard, J. A. Uythoven
CERN, Geneva
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A fast extraction system, located in the LSS6 region of the CERN SPS accelerator, transfers 450 GeV/c protons, as well as ions, via the transfer line TI 2 towards the LHC. The system includes three travelling wave kicker magnets, all powered in series, energised by a single Pulse Forming Network (PFN) and terminated by a short circuit. The specification for the system requires a kick flattop of 7800 ns duration with a ripple of not more than ±0.5%. Recent measurements with beam show that the ±0.5% kick specification is achieved over the initial 7100 ns of the kick flattop; however the ripple over 7800 ns is ±0.7%. Electrical measurements have been carried out on each of the three magnets: these have been compared with the beam measurements and the contribution of each magnet to the detailed shape of the flattop kick has been determined. This paper reports the results of measurements and describes the plans to upgrade the system to fully meet the kick specification.
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| TUPD004 |
10Hz Pulsed Power Converters for the ISIS Second Target Station(TS-2)
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1440 |
| |
- S. L. Birch, S. P. Stoneham
STFC/RAL/ISIS, Chilton, Didcot, Oxon
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The Extracted Proton Beamline to the ISIS second target station has two 10Hz pulsed magnet systems which extract the proton beam from the existing 50Hz beamline. Kicker 1 magnet system deflects the beam 12.1mrad and kicker 2 magnet system deflects the beam 95mrad. Both magnets are identical, however each pulsed power converter is considerably different. This paper describes the design requirements, topology, installation, testing and successful operation of both pulsed power converters.
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| TUPD006 |
The Injection and Extraction Kicker Circuits for the Elettra Booster
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1443 |
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- R. Fabris, P. Tosolini
ELETTRA, Basovizza, Trieste
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The design, realization and performance of the power circuits for the Booster injection and extraction Kicker magnets are presented. Both circuits have been designed and developed with the goal to achieve reliable working conditions, simple maintenance and fast recovery time in case of failures. The circuits are designed around the same switching unit already adopted in the Kicker system of the Storage Ring injection; this allows storing common spare parts for both circuits and for the Storage Ring Kicker system as well. Beside the analytical analysis, a parametric study of the circuit, with the Microsim PSPICE software package, allowed to optimize the performance of the circuit regarding the parameters which were considered critical for the Booster injection and extraction processes, i. e. the current pulse rise time and fall time.
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| TUPD007 |
The Design and Fabrication of the Kicker Power Supply for TPS Project
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1446 |
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- C.-S. Fann, K. T. Hsu, S. Y. Hsu, K.-K. Lin, K.-B. Liu, Y.-C. Liu, C. Y. Wu
NSRRC, Hsinchu
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The preliminary test results of the kicker power supply for TPS (Taiwan Photon Source) project will be presented in this report. The achieved capability of this test unit demonstrates that it fulfills the design requirement of providing half-sine pulsed current of 2.5 kA (peak), 5.2 s (base-width), with jitter < 1 ns (peak-to-peak). Both units of using thyratron and IGBT switches are built with the same requirements. The technical considerations of both units for this particular application will be discussed.
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| TUPD008 |
Marx Bank Technology for Accelerators and Colliders
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1449 |
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- J. A. Casey, F. O. Arntz, M. P.J. Gaudreau, M. K. Kempkes, I. Roth
Diversified Technologies, Inc., Bedford, Massachusetts
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Diversified Technologies, Inc. (DTI) has developed high power, solid-state Marx Bank designs for a range of accelerator and collider designs. We estimate the Marx topology can deliver equivalent performance to conventional designs, while reducing acquisition costs by 25-50%. In this paper DTI will describe the application of Marx based technology to two different designs: a long-pulse ILC focused design (140 kV, 160 A, 1.5 ms), and a short-pulse design (500 kV, 265 A, 3 us). These designs span the known requirements for future accelerator modulators. For the ILC design, the primary challenge is minimizing the overall size and cost of the storage capacitors in the modulator. For the short-pulse design, the primary challenge is high speed operation, to limit the energy lost in the pulse rise-time while providing a very tight (± 3%) voltage flattop. Each design demands unique choices in components and controls, including the use of electrolytic capacitors in the ILC Marx design. This paper will review recent progress in the development and testing of both of these prototype Marx designs, being built under two separate DOE Phase II SBIR grants.
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| TUPD010 |
High-power Switch with SI-thyristor for the Power Supply of Very High Repletion Rate Pulsed Quadrupole Magnet
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1452 |
| |
- T. Mimashi, M. Kikuchi
KEK, Ibaraki
- A. Tokuchi, K. Tsuchida
Nichicon (Kusatsu) Corporation, Shiga
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A solid-state switch with SI-thyristors is implemented as the high power switch for the pulsed quadrupole magnet power supply. Its repletion rate is 100 kHz with the half sign 1 microsecond pulse. The switch has been successfully operated.
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| TUPD011 |
The Pulsed Quadrupole Magnet for KEKB Low Energy Ring
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1455 |
| |
- T. Mimashi, T. Ieiri, M. Kikuchi
KEK, Ibaraki
- A. Tokuchi, K. Tsuchida
Nichicon (Kusatsu) Corporation, Shiga
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In the KEKB low energy ring, because of photoelectron clouds, the betatron tune changes along the position in the train. The produced photoelectron gives focusing force to the beam. It is remarkable especially in the vertical tune. Since we have a 500 nanoseconds beam abort gap, the photoelectron focusing force is weaker at the head of train. It means the vertical tune is lower at the head of the train. In order to cancel this tune shift, the pulsed quadrupole magnet was installed. The pulsed quadrupole magnet system and its performance are described.
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| TUPD014 |
Detailed Design, Manufacturing and Testing of a Strip-line Extraction Kicker for CTF3 Combiner Ring
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1458 |
| |
- I. Rodriguez, L. García-Tabarés, E. Rodríguez García, F. Toral
CIEMAT, Madrid
- D. Alesini, A. Ghigo, F. Marcellini, M. Zobov
INFN/LNF, Frascati (Roma)
- T. Fowler, I. Syratchev
CERN, Geneva
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The first calculations to design the CTF3 Combiner Ring extraction kicker are reported elsewhere. The last computing step before fabrication is the wakefield analysis, to determine if the bunch disturbance is acceptable. Two different codes have been used for cross-checking: CST Particle Studio and GDFidl. The computation is challenging because of the long structure (2.4 m) with a short bunch (3 mm). Besides, both transitions are not equal, because of different straight sections of the input and output beam pipe, and then the solution method is more complex. On the other hand, the main challenges for manufacturing are the long electrodes support via ceramic stand-offs and the flexible electrical connections to allow for electrodes thermal differential displacement. Special tooling has also been developed for assembly within the required tolerances. The device has been successfully leak tested. High frequency transmission coefficients and high voltage dielectric strength were also measured.
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| TUPD016 |
Grounding and Induced Voltage Issues of the Injection Bump Magnet System of the 3-GeV RCS in J-PARC
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1461 |
| |
- T. Takayanagi, J. Kamiya, M. Kinsho, T. Ueno, M. Watanabe, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
- Y. Irie
KEK, Ibaraki
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The power supply of the injection shift bump magnets is required to rate a large current with high precision. The rating current is 20 kA and the pulse width is 1.3 ms. The power supply with the multiple connected two-quadrant IGBT choppers, which is controlled by the switching frequency over 48 kHz, realizes the tracking error less than 1.0 %. However, the switching noise due to the IGBT choppers caused damages to the control device and the measuring instrument. The ground cables were changed to copper sheets, so that the voltage due to the switching noise between the power supply board and the ground decreased from 800 V to 40 V. Furthermore, the output voltage of the RF shield was measured in connection with the several waveform patterns. These results showed the good agreement with the calculation and the experiment. The good performances of the shift bump magnet and power supply have been confirmed.
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| TUPD017 |
Design of Main Ring Dipole Power Supply for HIRFL-CSR
|
1464 |
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- Y. X. Chen, X. M. Feng, D. Q. Gao, Y. L. Gao, Y. Z. Huang, Y. Tang, J. J. Wang, J. W. Xia, H. B. Yan, H. H. Yan, Y. J. Yuan, Z. D. Yuan, S. Zhang, X. L. Zhang, Z. Z. Zhou
IMP, Lanzhou
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This paper introduces the main circuit topologic, control method and double reference setting system of a dipole power supply which is the pivotal device of the HIRFL-CSR(Heavy Ion Research Facility in Lanzhou-Cooling Storage Ring). The power supply works at the pulse mode, with the peak output power of 3.15MW (3000A, 1045V). To fulfill difficult requirements especially for the tracking error, which is needed less than 300ppm, a special topologic is adopted. The power supply has two parts: SCR rectifier provides the most energy and PWM converter provides correcting current and perfect reaction for tracking current setting. Now the dipole power supply is performing well during the CSR commissioning, with the perfect tracking error, well long-time stability and low ripple current.
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