Paper |
Title |
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MOPIK075 |
Design, Simulation and Compare of Flat Cathode Electron Guns with Spherical Cathode Electron Guns for Industrial Accelerators |
702 |
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- M. Nazari, F. Abbasi
Shahid Beheshti University, Tehran, Iran
- S. Ahmadiannamin
ILSF, Tehran, Iran
- F. Ghasemi
NSTRI, Tehran, Iran
- S. Haghtalab
IPM, Tehran, Iran
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In this article, electron guns with flat and spherical cathodes have been designed and simulated for industrial accelerators. After checking the different features of each cathode geometry, there has been discussed about optimum values of this features. The most important features in selecting the best cathode geometry for industrial accelerators are beam waist radius, beam waist position, current density and price. Finally after comparing the different features of both geometries with each other, suitable geometry was selected.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK075
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TUPAB042 |
Current Status of IPM Linac Control System |
1418 |
SUSPSIK084 |
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- S. Haghtalab, F. Abbasi
Shahid Beheshti University, Tehran, Iran
- S. Ahmadiannamin
ILSF, Tehran, Iran
- F. Ghasemi, M. Lamehi
IPM, Tehran, Iran
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This paper reports the progress of the control system for IPM 10 MeV accelerator. As an electron linac, it consists of beam injection acceleration tube, radio frequency production and transmission, target, diagnostics and control and safety. In support of this source, an EPICS-based integrated control system has been designed and being implemented from scratch to provide access to the critical control points and continues to grow to simplify operation of the system. In addition to a PLC-based machine protection component and IO interface, a CSS-based suite of control GUI monitors systems including Modulator and RF, Vacuum, Magnets, and electron gun. An overview of this system is presented in this article.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB042
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TUPAB043 |
Design and Simulation of Voltage Multiplier Column of a 300keV, 10mAParallel Fed Cockcroft Walton Electron Accelerator for Industrial Applications |
1421 |
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- M. Nazari, F. Abbasi Davani, F. Ghasemi
Shahid Beheshti University, Tehran, Iran
- S. Ahmadiannamin
ILSF, Tehran, Iran
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In this article a 300keV, 10mA multiplier column has been designed for a parallel fed Cockcroft Walton electron accelerator for industrial applications. The parallel fed Cockcroft Walton multiplier is a capacitive coupling multiplier with diode rectification which can convert an input RF voltage to a low ripple output DC voltage. In this research tried to get a low ripple (300keV output) dc voltage. At first, the voltage multiplier column has been simulated with pspice simulation software. After doing the pspice simulations, optimum value of different parameters has been get. At the end we try to get the optimum values of pspice simulations with a mechanical design with CST STODIO. The mechanical design of voltage multiplier and its equivalent circuit hah a good accordance with each other.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB043
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TUPAB044 |
SIMULATION, MEASUREMENT AND TUNING OF A PROTOTYPE DISK LOADED RF CAVITY |
1424 |
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- S. Ahmadiannamin
ILSF, Tehran, Iran
- F. Abbasi, F. Ghasemi
Shahid Beheshti University, Tehran, Iran
- M. Lamehi, M. Shirshekan
IPM, Tehran, Iran
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Constant impedance accelerator RF cavities are constructed from similar resonator cells that stacked to each other. Best operation condition is achieved when all of cells resonate in one resonance frequency with similar quality factors. So, measurement and tuning of RF cavities is the critical step for final best operation of linear accelerators. In this paper, the electromagnetic computer simulations, RF measurement and final tuning of a nine cell periodic accelerator structure was represented. All of cavities tuned in one resonant frequency and according to theoretical concepts we obtain nine resonant modes from RF measurements by vector network analyzer.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB044
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TUPAB045 |
Design and Construction of a Pre-Buncher for Iranian Low Energy Linear Accelerator |
1428 |
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- S. Ahmadiannamin
ILSF, Tehran, Iran
- M. Bahrami, M.R. Khalvati, M. Lamehi, H. Shaker, M. Shirshekan
IPM, Tehran, Iran
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Iranian IPM low energy linear accelerator project (e-Linac) is in its final steps for commissioning. Beam dynamic simulations with and without Pre-buncher prior to buncher was done. The results represent improvement in capturing efficiency better than 25% by application of Pre-buncher cavity. In this paper, we present the simulation, construction, RF measurements and vacuum test results. After construction, we measured RF reflection coefficient better than -33 dB in the nominal frequency of 2997.9 MHz with quality factor of 4500.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB045
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THPVA084 |
Evaluation of Collective Effects in Iranian Light Source Facility (ILSF) Storage Ring |
4650 |
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- E. Ahmadi, S. Ahmadiannamin, J. Rahighi
ILSF, Tehran, Iran
- S.M. Jazayeri
IUST, Narmac, Tehran, Iran
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In this paper, we present the calculations of various collective effects in the storage ring of ILSF, a synchrotron light source under design in Iran. The ILSF storage ring is based on 5-BA lattice structure and emittance of 270 pm-rad which is optimized to provide high brightness and flux photons for the users. Because of design features, small radius vacuum pipe and small momentum compaction factor of lattice, it is expected that instabilities emerging from collective effects will affect significantly the beam quality and make it is challenging to reach maximum designed beam current. We will address the results of beam quality degradation and threshold calculations for different singlebunch and multibunch instabilities.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA084
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THPVA085 |
Design and Construction of 126 MHz Capacity Loaded Aluminium Cavity Prototype |
4653 |
SUSPSIK092 |
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- S. Ahmadiannamin, J. Rahighi, Kh.S. Sarhadi
ILSF, Tehran, Iran
- F. Abbasi
Shahid Beheshti University, Tehran, Iran
- M. Lamehi Rashti
IPM, Tehran, Iran
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Iranian light source Facility (ILSF)isa 3 GeV Ultra low emittance synchrotron with 528 meter circumference that will be constructed in the city of Qazvin, located 150km west of Tehran. Motivated by the development of HOM damped cavity with simpler structure at 100 MHz at MAX Lab and also lower costs, 100 MHz RF system is envisaged for ILSF booster and storage ring. An RF cavity prototype was fabricated for better understandingof characteristics of capacity loaded RF cavities by practical investigation. In this paper, design and development of this prototype is presentedwith the simulation and measurement results.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA085
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THPVA086 |
Beam Dynamics Studies of an Accelerating Tube for 6 MeV Electron LINAC |
4657 |
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- S. Zarei
Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran
- F. Abbasi
Shahid Beheshti University, Tehran, Iran
- S. Ahmadiannamin
ILSF, Tehran, Iran
- F. Ghasemi
NSTRI, Tehran, Iran
- M. Lamehi
IPM, Tehran, Iran
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Side coupled standing wave accelerating tubes are widely used in a low energy linear accelerator because of relatively high accelerating gradient and low sensitivity to construction tolerances. The effective interaction of particles and electromagnetic fields is important for accelerate electrons to intended energy with the greatest efficiency and beam quality output. In this paper, we present the beam dynamics of a 6 MeV Side coupled standing wave accelerating tube using a space charge tracking algorithm (ASTRA). The designed accelerating tube that feeds by a maximum power of 2.6 MW resonant at frequency of 2998.5 MHz in pi/2 mode. 37.5 percent capture efficiency, 6.82 pi-mm-mrad horizontal emittance, 6.78 pi-mm-mrad vertical emittance, 2.24 mm horizontal and vertical beam size and 1079 keV energy spread of the output beam have been determined from the results of beam dynamics studies in ASTRA
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA086
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THPVA087 |
Thermal and Mechanical Analysis of 3 GHz Side Coupled RF Cavity for Medical Linacs |
4660 |
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- M. Mohseni Kejani, F. Abbasi
Shahid Beheshti University, Tehran, Iran
- S. Ahmadiannamin
ILSF, Tehran, Iran
- F. Ghasemi
NSTRI, Tehran, Iran
- S. Zarei
Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran
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Medical linear accelerators have wide applications for cancer treatment in the world. Side coupled RF cavities was used in this accelerators for production of X-ray in range of energies between 4 to 25 MeV. Usually, the RF source is magnetron with lower cost in comparison to klystron in this type of applications. Side coupled cavity is a biperiodic structure with sensitive performance to operational thermal and mechanical conditions. In this paper, thermal and mechanical simulations for a period of the structure are presented.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA087
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THPVA088 |
DESIGN AND CONSTRUCTION OF BRAZED SIDE COUPLED CAVITY OF MEDICAL ACCELERATOR |
4664 |
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- S. Ahmadiannamin, Kh.S. Sarhadi
ILSF, Tehran, Iran
- F. Abbasi, M. Mohseni Kejani
Shahid Beheshti University, Tehran, Iran
- M. Bahrami, M. Lamehi
IPM, Tehran, Iran
- F. Ghasemi
NSTRI, Tehran, Iran
- S. Zarei
Nuclear Science and Technology Research, InstituteRadiation Application School, Tehran, Iran
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Two types of standing wave RF cavities are used routinely in construction of medical linear accelerators. These two types are Side coupled and on-axis coupled standing wave cavities. This selection is based on higher shunt impedance and compactness in comparison to travelling wave RF cavities. In this paper, we present the simulation, construction and measurement results of brazed section of 3 GHz side coupled RF cavity. It is the first successful experience of its kind in Iran. The obtained experiences can be used effectively for construction of side coupled thermionic RF guns and RF cavities of medical or industrial linacs.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA088
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THPVA089 |
Optimization Study on Production of Mo-99 Using High Power Electron Accelerator Linac |
4667 |
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- A. Taghibi Khotbeh-Sara, F. Rahmani
KNTU, Tehran, Iran
- S. Ahmadiannamin
ILSF, Tehran, Iran
- F. Ghasemi
NSTRI, Tehran, Iran
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Molybdenum-99 is used for preparing 99mTc, which is the most widely used isotope in nuclear medicine. As a recent and now shortages in reactor-based supplies of 99Mo/99mTc and also some problems due to the time limitation in a direct production approach such as 100Mo(p, 2n)99mTc reaction by cyclotrons, many of developed countries have started the plan to produce this type of radioisotopes based on the production of non-reactor methods, especially by linac. In this study, the investigation on 99Mo production based on high power electron linac as an alternative approach has been performed, in which the use of 100Mo(gamma, n)99Mo (photoneutron production) has been proposed.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA089
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