Author: Khosravi, N.
Paper Title Page
TUPAB241 Characterization of the RF-Cavities geometry in Order to Optimize the Beam Parameters in S-Band On-Axis LINACs 2005
 
  • A. Khosravi, B. Shokri
    LAPRI, Tehran, Iran
  • N. Khosravi
    ILSF, Tehran, Iran
 
  The RF characteristics of an accelerating tube are primarily assigned to geometrical features of a cavity. As a consequence of this geometry, the final electric field will make the shape of our Gaussian bunch and the final dose. The accelerating field can be studied considering the nose cone, gap, and bore radius. In dual electron linacs, the role of input power and bunch current is inevitable. Therefore, the geometrical issues of RF-cavities are studied in a 6MeV electron on-axis SW tube. To make an accurate comparison, each RF-cavity is designed and optimized by POISSON SU-PERFISH. The optimized cavities are imported to the PIC solver of CST. Then the beam characteristics are studied on a predefined target.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB241  
About • paper received ※ 18 May 2021       paper accepted ※ 14 June 2021       issue date ※ 30 August 2021  
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TUPAB242 The Beam-Study of the Side and On-Axis RF Cavities in S-Band 6 MeV LINACs 2008
 
  • A. Khosravi, B. Shokri
    LAPRI, Tehran, Iran
  • N. Khosravi
    ILSF, Tehran, Iran
 
  The geometry of side and on-axis RF cavities are two magnetic-coupled designs for the different LINAC applications. The electromagnetic fields, RF power, beam parameters, thermal stability, and manufacturing costs are the most critical factors in cavity type selection in each application. In this article, both RF-cavities are optimized in POISSON SUPERFISH code to compare the beam parameters accurately. Then the optimized cavities are making a tube and compare in ASTRA 1D code and CST 3D software. At last, the thermal sensitivity of both models is studied in MPHYSICS module of the CST. As a result, the final decision can be achieved on the side or on-axis cavities considering the input power, costs, beam properties, and thermal stability for the different applications of the LINACs  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB242  
About • paper received ※ 18 May 2021       paper accepted ※ 21 June 2021       issue date ※ 30 August 2021  
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TUPAB243 Investigation of the Buncher Effect on Beam Properties in SW 3-6 MeV LINACs 2012
 
  • A. Khosravi, B. Shokri
    LAPRI, Tehran, Iran
  • N. Khosravi
    ILSF, Tehran, Iran
 
  The best quality of an electron beam is the primary goal of a linear accelerator design. Beam-study on a buncher section can lead us to a better perspective of the modulation and acceleration of a beam to optimize the final Gaussian beam. Five setups of different bunchers are designed, optimized, and presented in this article. A more brilliant and converged beam with a higher current, transverse emittance and smaller beam size is the study’s goal.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB243  
About • paper received ※ 18 May 2021       paper accepted ※ 14 June 2021       issue date ※ 26 August 2021  
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TUPAB244 THE WAKEFIELD STUDY OF THE RF-SHIELDED BELLOWS AT THE ILSF STORAGE RING 2015
 
  • N. Khosravi, E. Ahmadi, M. Akhyani
    ILSF, Tehran, Iran
  • M. Akhyani
    EPFL, Lausanne, Switzerland
  • A. Khosravi
    LAPRI, Tehran, Iran
 
  The corrugated geometry of the bellows made it critical to be shielded with an RF-Shield. Different types of RF shields can be applied to the ILSF vacuum chamber to cover this component’s destructive impedance peaks. Then, the Impedance study and optimization of the RF shields can improve the impedance budget. In this article, two common types of RF shields are simulated in CST software.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB244  
About • paper received ※ 16 May 2021       paper accepted ※ 02 June 2021       issue date ※ 14 August 2021  
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TUPAB245 WAKEFIELD AND HEAT LOAD STUDY OF THE GATE VALVES AT ILSF STORAGE RING 2018
 
  • N. Khosravi, E. Ahmadi, M. Akhyani
    ILSF, Tehran, Iran
  • M. Akhyani
    EPFL, Lausanne, Switzerland
  • S. Dastan
    IPM, Tehran, Iran
  • A. Khosravi
    LAPRI, Tehran, Iran
 
  As one part of the ILSF storage ring, the rf-shield of the gate valves generates considerable interest in terms of wake impedance and heat-load. Inside the gate valves, there is a vacuity, which causes low frequencies resonances, and it can lead to beam instabilities. Therefore, controlling and eliminating these frequencies will be substantial. A radio frequency rf-shield structure, which conceals this transverse gap of the gate valves, is indispensable for low emittance chambers. This paper analyzes the wake impedance and thermal behavior of a finger-band RF shield in the gate valve.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB245  
About • paper received ※ 16 May 2021       paper accepted ※ 14 June 2021       issue date ※ 13 August 2021  
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