Author: Chai, J.-S.
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TUPMR011 Development of Optimized RF Cavity in 10 MeV Cyclotron 1250
 
  • M. Mohamadian, H. Afarideh, M. Salehi
    AUT, Tehran, Iran
  • J.-S. Chai, M. Ghergherehchi
    SKKU, Suwon, Republic of Korea
 
  Cyclotron cavity modelled by an artificial neural net-work, which is trained by our optimized algorithm. The training samples are obtained from simulation results, which are done by MWS CST software for some defined situation and parameters, and also with the conventional BP algorithm. It is shown that the optimized FFN can estimate the cyclotron model parameters with acceptable outputs. Hence, the neural network trained by this algorithm represents the proper estimation and acceptable ability to our structure modelling. The cyclotron cavity parameter modelling illustrate that the neural network trained by this algorithm could be the acceptable method to design parameters.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR011  
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TUPMR012 Investigation of Central Region Design of 10MeV AVF Cyclotron 1253
 
  • M. Afkhami Karaei, H. Afarideh, S. Azizpourian, R. Solhju
    AUT, Tehran, Iran
  • J.-S. Chai, M. Ghergherehchi
    SKKU, Suwon, Republic of Korea
 
  Recently, studies on the central region of 10 MeV AVF Cyclotron have been done at AmirKabir University of Technology. In this study, the aim of the cyclotron design is to accelerate the ions up to 10MeV energy. The cyclotron, consist of four sector magnets and 2 RF cavities which will be operated at 71 MHz. The internal PIG ion source is used in this cyclotron. The purpose of this work is to investigate the behavior of trajectories of ions in the magnetic and electric fields at the center of the cyclotron. The electric and magnetic field distribution was designed by OPERA-3DTOSCA. In order to solve the equation of motion, numerical code was written in C++ program that used the conventional Rung-Kutta method. The obtained results of simulation were the horizontal and vertical motion of an ion in the center of cyclotron, and motion of the center of the orbits.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR012  
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TUPMR013 Heat Transfer Study of PIG Ion Source for 10 MeV Cyclotron 1256
 
  • F. Zakerhosseini, H. Afarideh, S. Sabounchi
    AUT, Tehran, Iran
  • J.-S. Chai, M. Ghergherehchi
    SKKU, Suwon, Republic of Korea
 
  A PIG Ion source provides H-ions for the 10 MeV cyclotron, which is designed and being manufactured by Amirkabir university of technology. Plasma created in the anode contains the desired ions. Discharge for producing plasma consists of the both ion current from plasma towards the cathode and the secondary electron current from the cathode to the plasma. Secondary electron emission is the result of ion collision on the surface of the cathode. Heat generated by these collisions is considerably high, so a cooling system for ion source is crucial. In this paper heat transfer study of the ion source, temperature distribution and deformation of different parts simulated using ANSYS CFX. Also the thermionic emission of the electrons from cathode in the calculated temperatures by ANSYS simulated Using CST STUDIO. Results showed the maximum temperature of the cathodes is 1992 K, which is far away from the cathode melting point. The thermionic current in 1992 K of cathode simulated and the results showed an electron current of 0.00706 A at 500 V which is negligible in comparison to the discharge current of 1 A. Maximum deformation were about 0.2 mm in cathode edges.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR013  
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TUPMR015 Cooling and Heat Transfer of the IRANCYC-10 Transmission Line 1259
 
  • S. Sabounchi, H. Afarideh, M. Mohamadian, M. Salehi
    AUT, Tehran, Iran
  • J.-S. Chai, M. Ghergherehchi
    SKKU, Suwon, Republic of Korea
 
  Heat transfer study for designing RF transmission line in cyclotrons is crucial. Because of enormous amount of surface current on RF transmission line, despite high conductivity of copper, significant amount of heat is being generated, which is enough for altering characteristic impedance and other desirable parameters for transmission line. So, effective cooling system which is nourished by central chiller system is essential. For design of cooling system in RF transmission line suitable mass flow, appropriate geometry and confined temperatures are prominent in order to avoid eroding and impedance changing. In this paper an attempt has been done for accurate analyzing and simulating of heat transfer phenomenon for the 10MeV cyclotron (IRANCYC-10 ) which is under construction at AmirKabir University of Technology. By using Ansys CFX simulation software, the optimum cooling line geometry and mass flow rate of 90 gr/s for cooling water, has been resulted.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR015  
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TUPMR060 Improvement of 18 MeV Cyclotron Magnet Design by TOSCA Code 1397
 
  • N. Rahimpour Kalkhoran, H. Afarideh, R. Solhju
    AUT, Tehran, Iran
  • J.-S. Chai, M. Ghergherehchi
    SKKU, Suwon, Republic of Korea
 
  According to increasing need to cyclotrons in the world, designing and manufacturing of these machines are considered. Therefore designing of 18 MeV cyclotron magnet has begun at Amirkabir University Of Technology. Magnet is one of the most important parts of the cyclotron, so in designing of magnet, all other components of cyclotron which influence on magnet, should be considered. Since the achievable energy for particle is determined 18MeV, designed magnet has AVF structure. TOSCA (Opera-3D) code was selected for simulation and analysis. First of all, theoretical calculations and estimations were done and magnetic field data according to radius were achieved, after that, simulation with initial estimations and a simple model of magnet was begun and optimization process continued until magnetic field results from the simulation coincided with the theoretical one. Different shimmings were used for better coincidence. Some results contains magnetic field on middle plane and betatron oscillations were checked. Also working points of the cyclotron with resonance regions were checked. According to use reliable mesh, the accuracy of simulation results is sufficient high.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMR060  
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