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| WEPMA124 |
Preliminary Design, Analysis and Manufacturing Aspects of Low Beta 350 MHz Reentrant Superconducting RF Cavity
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497 |
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- D. K. Mishra, M. Bagre, P. R. Hannurkar, V. Jain, G. Mundra, M. Prasad, A. Puntambekar, P. Shrivastava
RRCAT, Indore (M. P.)
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A superconducting reentrant cavity for low beta, high intensity beam has been designed using SUPERFISH and MAFIA. The study has been done for cavity shape optimization considering the minimization of surface fields. Further its structural design has been done and feasibility study of different manufacturing aspects has also been done. A full-scale mild steel model with copper coating has been fabricated. A twin arm mechanical tuner has been designed for slow tuning by elastic deformation. This was tested with low power RF to validate the design parameters and to check the tuning sensitivity. In this paper the design and development activity of the reentrant superconducting will be discussed
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| WEPMA137 |
Design and Simulation of Multibeam Klystron Cavity
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509 |
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- A. K. Tiwari, R. K. Arora, P. R. Hannurkar
RRCAT, Indore (M. P.)
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The klystron amplifier is capable of providing maximum power per unit length. A number of klystrons may be paralleled to get more power output and increased redundancy but phase matching at output remains a troublesome part of any such arrangement. Multibeam klystron provides a solution where all the beams are accelerated through a common voltage and interaction takes place in a common structure namely multibeam cavity so the problem of phase matching no longer exists. The advantage of MBK is low perveance for individual beams and hence higher efficiency. The design and simulation of a multibeam klystron cavity with four beams is presented using electromagnetic code Microwave Studio. R/Q at frequency 350MHz is optimized. The cavity simulated is to be used in 350 MHz, 250 kW CW klystron. This klystron will be used for 100 MeV proton Linac for Spallation Neutron source (SNS). Important Simulation results are described.
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| WEPMA142 |
Commissioning and Operational Experience with INDUS-2 RF Systems
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517 |
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- M. Lad, M. K. Badapanda, A. Bohrey, P. R. Hannurkar, A. Jain, M. K. Jain, N. Kumar, M. Prasad, V. Rajput, D. Sharma, N. Tiwari, R. K. Tyagi, R. K.DEO. deo
RRCAT, Indore (M. P.)
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2.5 GeV, 300mA Synchrotron Radiation Source Indus-2 is under commissioning phase at RRCAT, Indore. The beam injection in Indus 2 from Booster Synchrotron started in July 2005,since then RF system is in operation. RF system compensates the SR losses experienced by the circulating electrons in the bending magnets and insertion devices. In addition to compensate Synchrotron losses, RF system will have to supply power for boosting energy from 600 MeV to 2.5 GeV. Indus-2 RF system employs four numbers of ELETTRA make elliptical cavities to generate 1500 kV accelerating RF voltage at 505.812 MHz. Each RF cavity is powered by 64 kW RF amplifier. With around 650 KeV of SR losses the system is designed to provide cavity gap voltage such that sufficiently high quantum and Touschek lifetime is achieved. Initially conditioning of all four RF cavities was performed. Then system was handed over for operation and with beam trials optimization of different parameters of RF system is being done. The paper describes test results of Indus-2 RF system & commissioning and operational experience of Indus-2 RF system.
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| WEPMA143 |
High-Power, Low-Loss, Radial Rf Power Dividers/Combiners
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520 |
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- A. Jain, A. Gupta, P. R. Hannurkar, D. Sharma
RRCAT, Indore (M. P.)
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A 20 kW Solid State Power Amplifier (SSPA) at 352 MHz development is in progress at RRCAT. This design uses radial splitting and combining architecture in which the signal is divided into a number of individual parts. Each individual part is then amplified by a respective amplifier of 200 W. The outputs of the amplifiers are then combined into a single output that achieves final output power of the order of 1.5 kW to 4 kW. As a part of this system, two high power combiners have been designed and developed. One is 8 way with output ports opposite to input port. Second one is 16 way with radial output ports. Both of these designs are compact with 20 cm diameter of outer radial disk. Input ports are N connector, while output port is 15/8” rigid coaxial line. Measured performance of these two designs shows insertion loss of 0.6 dB and input VSWR of 1.09. Radial architecture uses in-phase, non-resonant radial transmission line structures.
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