Fabrication and Installation of Radio Frequency Cavity for K500 Superconducting Cyclotron at Kolkata (original) (raw)
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Fabrication and Installation of Radio Frequency System for K500 Superconducting Cyclotron at Kolkata
2010
K500 Superconducting Cyclotron (SCC) is already commissioned successfully at VECC, Kolkata by accelerating Ne³⁺ internal beam with 70 nA beam current at 670 mm extraction radius. The Radio Frequency cavity of SCC is successfully operational since last two years. All these years were very challenging and worthy period from the point of view of gaining experience and knowledge by solving fabrication and assembly problems faced during construction of 10 m tall copper made coaxial RF cavities and tackling RF related commissioning problems. RF system operates within the frequency range of 9 to 27 MHz for generating maximum 100 kV DEE voltage. The construction of the RF system demands making of numerous critical soldering and brazing joints including joints between ceramic and copper along with maintaining close dimensional accuracies, assembly tolerances, mirror symmetricity, surface finish and utmost cleanliness. This paper presents the details of fabrication and installation procedures...
2017
The AMIT cyclotron will be a 8.5 MeV, 10 microAmp, CW, H⁻ accelerator for radioisotope production, including a superconducting, weak focusing, 4 T magnet, allowing for a low extraction radius and a compact design. The cavity is a 60 MHz, quarter wave resonator powered by a modular 8 kW solid state amplifier. The design of the cavity dealed with challenging requirements: high electric fields required by a high voltage (60 kV) on a small gap, a small aperture of the magnet leading to high capacitances and thermal losses and a requirement for a low overall size of the cavity. The fabrication process included high precision machining, soft soldering, laser welding and careful metrologies, which are described together with other technical and practical aspects. The low power tests showed a good agreement with the simulations. The conditioning of the cavity was performed with a 1.1 T magnetic field applied on the central region. It was successfully finished regarding to maximum voltage re...
Design, Fabrication and Characterization of RF Cavities for 250 kW CW C-Band Klystron
The paper presents the design and development of cylindrical and rectangular reentrant cavities for a 5 GHz, 250 kW CW C-band klystron being developed at CEERI Pilani. Simulation tools like CST MICROWAVE STUDIO, SUPERFISH, AJ DISK, MAGIC-2D have been used for design of the cavities. Cavities are designed using 1D code Superfish. By using Superfish , value of R/Q, Stored energy, Quality factor, field contours, is calculated. Further the distances between the cavities are calculated using AJ disk software. Then it is validated by using Magic 2D software and power distribution, field contour, intensity of field along the direction of propagation is calculated. Based on the simulated results the cavities are designed. The fabrication of cavities was carried out through machining of piece parts, brazing, vacuum leak testing and characterized through cold testing. The paper will describe the design procedure, mechanical fabrication processes and cold measurement of frequency and Q of the cavities. These re-entrant cavities are widely used in klystron. They play a prominent role in deciding the performance of the klystron. designed using Superfish Software and value of R/Q, stored energy, and Quality factor is calculated. Then it is validated by using Magic 2D software. Based on the simulated results, fabrication of cavities has been done.
RF Cavity Simulations for Superconducting C400 Cyclotron
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The compact superconducting isochronous cyclotron C400 [1] has been designed by IBA (Belgium) in collaboration with the JINR (Dubna). It will be the first cyclotron in the world capable of delivering protons, carbon and helium ions for therapeutic use. 12 C 6+ and 4 He 2+ ions will be accelerated to the energy of 400 MeV/u energy and extracted by electrostatic deflector, H2 + ions will be accelerated to the energy of 265 MeV/u and extracted by stripping. It is planned to use two normal conducting RF cavities for ion beam acceleration in cyclotron C400. Computer model of the double gap delta RF cavity with 4 stems was developed in is a generalpurpose simulation software CST STUDIO SUITE. Necessary resonant frequency and increase of the voltage along the gaps were achieved. Optimization of the RF cavity parameters leads us to the cavity with quality factor about 14000, RF power dissipation is equal to about 50 kW per cavity.
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The SC200 proton therapy superconducting cyclotron is currently under construction by ASIPP (Hefei, China) and JINR (Dubna, Russia). The radio frequency (RF) system which provides an accelerating electric field for the particles, has been designed and tested in a high-power commissioning. The RF system consists of RF cavity, Low-level RF control system, RF source, transmission network and so on. The main performances of RF cavity meet design and use requirements in the cold test. The RF cavity achieved with an unload Q factor of 5200 at the resonant frequency of 91.5 MHz, 60 kV (Center)~120 kV (Extraction) accelerating voltage and coupling state of S11 -30 dB. The low-level RF (LLRF) system has been tested with an amplitude stability of 0.2% and a phase stability of 0.1 degree in the high-power commissioning. What is more, the cavity operated in a ~50 kW continuous wave state after 4 weeks RF conditioning. Some risks have exposed at higher power test, but related solutions and impro...
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A Superconducting Linac is being installed as a booster for the 15 UD Pelletron accelerator at Nuclear Science Centre (NSC). The accelerating structure for this linac is a Nb QWR cavity, designed and fabricated as a joint collaboration between NSC and ANL, USA. Initial cavities required for the first linac module were fabricated at ANL. For fabrication of cavities required for future modules a Superconducting Resonator Fabrication Facility has been set up at NSC. Three quarter wave resonator (QWR) cavities have been fabricated using the in-house facility. This facility has been used for repairs on the resonators which sprung leaks. Fabrication of fifteen resonators for the second and third linac modules is under progress. Eight resonators along with a superconducting solenoid has been installed in the first linac cryostat and tested for energy gain with a pulsed beam of 90 MeV Si from the Pelletron. Acceleration of the ions to 96 MeV was measured downstream and beam transmission through the linac was measured to be 1 00%.
Study on Fabrication of Superconducting RF 9-CELL Cavity for Ilc at Kek
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A 56 MHz Superconducting RF Cavity operating at 4.4K is being constructed for the RHIC collider. This cavity is a quarter wave resonator with beam transmission along the centerline. This cavity will increase collision luminosity by providing a large longitudinal bucket for stored bunches of RHIC ion beam. The major components of this assembly are the niobium cavity with the mechanical tuner, its titanium helium vessel and vacuum cryostat, the support system, and the ports for HOM and fundamental dampers. The cavity and its helium vessel must meet equivalent safety with the ASME pressure vessel code and it must not be sensitive to frequency shift due to pressure fluctuations from the helium supply system. Frequency tuning achieved by a two stage mechanical tuner is required to meet performance parameters. This tuner mechanism pushes and pulls the tuning plate in the gap of niobium cavity. The tuner mechanism has two separate drive systems to provide both coarse and fine tuning capabi...