• Title/Summary/Keyword: LINAC

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Optimization of Dose Distribution for LINAC-based Radiosurgery with Multiple Isocenters (LINAC 뇌정위적 방사선 수술시 Multiple Isocenters를 이용한 최적 선량분포 계획)

  • Suh Tae-Suk;Yoon Sei Chul;Shinn Kyung Sub;Bahk Yong Whee
    • Radiation Oncology Journal
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    • v.9 no.2
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    • pp.351-359
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    • 1991
  • The current LINAC technique for radiosurgery utilizes a single isocenter approach with multiple noncoplanar arcs. This approach results in spherical dose distributions in the target. Many arteriovenous malformations and tumors suitable for radiosurgical treatment have non-spherical or irregular shapes. The basic approach presented in this paper is to use two or multiple isocenters with standard arcs to shape irregular target volumes through the use of multiple spherical targets. Selection of reasonable irradiation parameters in the first stage is critical to the success of real-time optimization. A useful guideline for optimum isocenter separation and collimator size is developed to shape the target margin uniformly with an desired isodose surface for an elongated target. The implementation of multiple isocenters with three dimensional dose model and application of multiple isocenters approach to several cases are discussed.

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Low beta superconducting cavity system design for HIAF iLinac

  • Mengxin Xu;Yuan He;Shengxue Zhang;Lubei Liu;Tiancai Jiang;Zehua Liang;Tong Liu;Yue Tao;Chunlong Li;Qitong Huang;Fengfeng Wang;Hao Guo;Feng Bai;Xianbo Xu;Shichun Huang;Xiaoli Li;Zhijun Wang;Shenghu Zhang;Jiancheng Yang;Evgeny Zaplatin
    • Nuclear Engineering and Technology
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    • v.55 no.7
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    • pp.2466-2473
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    • 2023
  • A superconducting ion-Linac (iLinac), which is supposed to work as the injector in the High Intensity heavy-ion Accelerator Facility project, is under development at the Institute of Modern Physics (IMP), Chinese Academy of Sciences. The iLinac is a superconducting heavy ion linear accelerator approximately 100 meters long and contains 96 superconducting cavities in two types of 17 cyromodules. Two types of superconducting resonators (quarter-wave resonators with a frequency of 81.25 MHz and an optimal beta β = v/c = 0.07 called QWR007 and half-wave resonators with a frequency of 162.5 MHz and an optimal beta β = 0.15 called HWR015) have been investigated. The cavity design included extensive multi-parameter electromagnetic simulations and mechanical analysis, and its results are described in details. The fundamental power coupler and cavity dynamic tuner designs are also presented in this article. The prototypes are under manufacturing and expected to be ready in 2023.

Evaluation of Comparison of Noise Power Spectrum according to the Time of Using Electronic Portal Imaging Device (EPID) for LINAC System (선형가속기의 시간에 따르는 전자조사문영상기구의 잡음전력스펙트럼 비교 평가)

  • Jung-Whan Min;Hoi-Woun Jeong
    • Journal of radiological science and technology
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    • v.47 no.2
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    • pp.117-123
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    • 2024
  • This study was to assessment of quality assurance (QA) and noise characteristics of Noise Power Spectrum (NPS) according to the time of by using electronic portal imaging device (EPID) for LINAC (Linear Accelerator). LINAC device was (Varian ClinacR iX LINAC, USA) used and the were 40 × 30 cm2 of detector size were 1024 × 768 photo-electric diode array size. Signal could be obtained the K-space image of white noise images for NPS and we used to Overlap, Non-Overlap, Out of Penumbra, Flatness, Symmetry, Symmetry Rt, Lt methods. The 2013s NPS image Out of Penumbra quantitatively value more than 2013s NPS image Symmetry Rt, Lt methods quantitatively NPS based on the frequency of 1.0 mm-1. Thus, the 2022s NPS image Out of Penumbra quantitatively value more than 2022s NPS image Symmetry Rt, Lt methods quantitatively NPS based on the frequency of 1.0 mm-1. The assessment of comparison of white noise for NPS image noise and intensity of this study were to that should be used efficiently of the LINAC EPID detector system for Overlap method for International Electro-technical Commission (IEC).

PULSED NEUTRON FACILITY BASED ON AN ELECTRON LINAC

  • Kim, Guin-Yun;Son, Dong-Chul;Lee, Young-Seok;Ko, In-Soo;Cho, Moo-Hyun;Namkung, Won;Chang, Jong-Hwa
    • Journal of Radiation Protection and Research
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    • v.26 no.3
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    • pp.327-331
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    • 2001
  • The Pohang Neutron Facility based on an electron linac was constructed in order to construct the infrastructure for nuclear data production in Korea. It consists of a 100-MeV electron linac, a water-cooled Ta target, and an 11-m time-of-flight path. We measured the time-of-flight path length, the neutron energy spectra for different water levels inside the moderator, and the neutron total cross sections of polyethylene and copper by the transmission method.

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Design Parameter of CW Klystron System for KOMAC

  • Lee, J. H.;H. J. Kwon;Kim, T. Y.;K. H. Chung;H. S. Kang;Park, S. J.;J. S. Oh;Kim, Dong-Il
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05b
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    • pp.963-966
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    • 1998
  • The KOMAC(KOrea Multi-purpose Accelerator Complex) linac is composed of RFQ(Radio Frequency Quadrupole), CCDTL(Coupled Cavity Drift Tube Linac) and SC(Superconducting)-linac. The required CW output power of RF system is about 25㎿ for 20㎿ proton beam power. Therefore high power RF sources are necessary for cost saving and reliability improvement. The number of klystrons for 0.5 ㎿ at 350MHz and 1 ㎿ at 700MHz are 1 and 31, respectively. In this paper, the design parameters of the klystron system including power supply and energy recovery system are presented.

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High voltage Pulsed Power modulator for medical LINAC applications (의료용 선형가속기 응용분야를 위한 고전압 펄스 전원 모듈레이터)

  • Jo, Hyun-Bin;Song, Seung-Ho;Lee, Seung-Hee;Park, Su-Mi;Jang, Sung-Roc;Ryoo, Hong-Je
    • Proceedings of the KIPE Conference
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    • 2018.11a
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    • pp.101-103
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    • 2018
  • This paper describes -40kV high voltage solid state pulse power modulator (SSPPM) for driving a magnetron, which is used as a RF power source of LINAC for cancer treatment systems. In case of the medical LINAC, small size and light weight are required. The SSPPM is 92 liters in size and weighs 50 kg. In this paper, S-band 2.6 MW magnetron load experiment is conducted and impedance matching was applied to obtain a smooth output current. Finally, the experimental results is discussed and the reliability of SSPPM is verified.

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A Study on the VME-Based Application for Integrated Control of PEFP Linac Machine Components

  • Song, Young-Gi;An, Eun-Mi;Kwon, Hyeok-Jung;Cho, Yong-Sub
    • Proceedings of the Korea Information Processing Society Conference
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    • 2009.11a
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    • pp.141-142
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    • 2009
  • The PEFP (Proton Engineering Frontier Project) is constructing a 100MeV proton Linac (Linear Accelerator). The 20 MeV 20 mA proton beam has been serviced for an application in the fields of material, biological, information technology and medical sciences. For a stable and efficient acceleration of a proton beam, the control requirements must be optimized by studying various control methods. We propose that the integrated control system for the Linac machine components must be based on a distribution control method to improve a centralized control system. Based on EPICS (Experimental Physics and Industrial Control System) real-time software, the VME (Versa Module European package format) IOC (Input Output Controller) was developed under cross development environment with a RISC (Reduced Instruction Set Computer) PowerPC system. In this paper, we describe the design and implementation of distributed control system using the VME-based EPICS middleware for various components of the large proton accelerator.

Vacuum system for PAL-XFEL

  • Na, Dong-Hyeon;Ha, Tae-Gyun;Park, Jong-Do
    • Proceedings of the Korean Vacuum Society Conference
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    • 2016.02a
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    • pp.110.2-110.2
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    • 2016
  • 4세대 방사광가속기는 0.1nm급 X-선 자유전자레이저(X-ray Free Electron Laser : XFEL) 광원을 빔라인 사용자들에게 제공하기 위하여 2011년 건설을 시작하였고, 2015년부터 장치를 설치하기 시작했으며 현재 건설 완료단계에 이르러 있다. 이 장치에서 진공시스템은 10-11 mbar의 초고진공이 요구되는 전자빔 발생장치인 RF Gun을 포함하는 입사장치구간(Injector)과 전체길이 800 m에 이르는 전자빔을 가속시키는 선형가속기구간(Linac) 그리고 결맞음 방사광을 발생시키는 언듈레이터구간으로 나눌 수 있다. 본 논문에서는 각 구간별 진공시스템에 대한 건설 현황에 대하여 보고하고자 한다.

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Construction of Vacuum system for PAL-XFEL

  • Na, Dong-Hyeon;Ha, Tae-Gyun;Park, Jong-Do
    • Proceedings of the Korean Vacuum Society Conference
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    • 2015.08a
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    • pp.94.1-94.1
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    • 2015
  • 4세대 방사광 가속기는 선형가속기와 언듈레이터를 활용하여 파장이 0.1 nm인 X선을 빔라인 사용자들에게 제공하는 것을 목표로 하여 2011년부터 건설되고 있다. 이 장치에서 진공시스템은 전자빔 발생장치인 RF Gun을 포함하는 입사장치(Injector)와 빔을 가속시키는 선형가속기(Linac) 그리고 결맞음 방사광을 발생시키는 언듈레이터로 나누어진다. 본 논문에서는 최종 수정 설계 후 제작 및 설치 중인 진공시스템의 건설 현황에 대하여 집중적으로 보고하고자 한다.

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Vacuum system for PAL-XFEL (4세대방사광가속기 진공시스템)

  • Na, Donghyun
    • Vacuum Magazine
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    • v.4 no.1
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    • pp.12-15
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    • 2017
  • The Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) is a 0.1 nm hard X-ray FEL which aims at providing photon flux higher than $1{\times}10^{12}$ photons/pulse using a 10-GeV electron linac. The vacuum system of the machine consists of an injector section including an S-band photocathode RF gun, 10-GeV electron linac section based on S-band normal conducting accelerating structures and a 150-m long out-vacuum undulator system. We introduce the present status of PAL-XFEL vacuum systems.