Keyword: photon
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MOPO069 Nuclear and Mechanical Basic Design of Target for Mo-99 Production Using High Power Electron Linac target, electron, neutron, linac 148
 
  • A. Taghibi Khotbeh-Sara, F. Rahmani
    KNTU, Tehran, Iran
  • F. Ghasemi
    NSTRI, Tehran, Iran
  • H. Khalafi
    AEOI, Tehran, Iran
  • M. Mohseni Kejani
    Shahid Beheshti University, Tehran, Iran
 
  Today providing enough supplies of 99mTc / 99Mo as a high usage radioisotope in diagnostic nuclear medicine for the world demand is a big challenge. One of the proofed ways to access reliable source of this radioisotopes is production using e-LINAC [1]. In this investigation it was tried to find the simple and the optimized design of 99Mo production target based on photoneutron reaction using e-LINAC. Based on the Monte-Carlo calculation for radiation transport and finite element thermal analysis, 9 thin plates of enriched 100Mo was suggested. Equal distance between plates was considered for cooling to prevent target melting. The main target includes only 100Mo in one-stage approach method to increase production rate in compare with two-stage approach [2]. Applying 2.5 m/s for inlet velocity of cooling water provides suitable cooling process with maximum temperature of target about 900 ˚C.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO069  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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MOPO122 European XFEL Cooling and Ventilation Systems FEL, undulator, controls, experiment 257
 
  • J.-P. Jensen
    DESY, Hamburg, Germany
 
  The European Free Electron Laser XFEL is operating since 2016. The technical systems for cooling and Ventilation CV were design, built and commissioned by the DESY work package WP34. The CV systems will be described and presented. The water cooling system consists of 3 cooling systems: 30/45 °C LCW for klystron and magnet cooling, 20/30 °C LCW for tunnel rack cooling and 8/14 °C for air conditioning and dehumidification of the air. The ventilation of the tunnels is connected to a series ventilation system from the experimental hall in direction to the injector. The series ventilation of the tunnels saves costs for air treatment with cooling, heating and dehumidification. The tunnel walls are a good heat storage that increases the air temperature stability by a factor of ten. The advantages of this concept will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-MOPO122  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO016 Investigation of 2D PBG Waveguides for THz Driven Acceleration GUI, acceleration, impedance, electron 714
 
  • A. Vint, R. Letizia
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • R. Letizia
    Lancaster University, Lancaster, United Kingdom
 
  Funding: Work supported by the STFC PhD Studentship
Novel accelerating techniques that overcome the limitations of conventional RF technology are receiving significant interest. Moving from RF to the THz frequency range, higher gradient of acceleration of high energy beams can be achieved in miniaturised structures. Moreover, with respect to the optical frequency range, the THz regime allows for larger structures and better beam quality to be obtained. In this paper, we investigate the use of a 2D photonic bandgap (PBG) waveguide for THz driven electron acceleration. In accelerator applications, the properties of PBG waveguides can be exploited to damp higher order modes and offer low-loss dielectric confinement at high frequency. In particular, 2D PBG waveguides offer a good compromise between manufacturability, total photonic bandgap confinement, and ease of parallel illumination. The structure here proposed is optimised for maximum bandgap and single mode operation. Dispersion characteristics of the accelerating mode are studied to achieve the best compromise between high accelerating field and effective accelerating bandwidth, given a ~10% bandwidth of the THz driving pulse.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO016  
About • paper received ※ 12 September 2018      issue date ※ 18 January 2019  
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THPO021 Research on X Ray Characteristics Produced by Highenergy Picosecond Electron Beam Shooting target, electron, linac, radiation 729
 
  • X.D. Zhang, X.P. Ouyang, B. Sun, X.J. Tan, X.F. Weng
    NINT, Xi’an, People’s Republic of China
 
  Funding: Supported by National Natural Science Foundation of China(11375142)
The X ray sources based on electron linac can produce X-rays with high energy, concentrated directions, and strong penetrating power, which have been widely applied in various fields. An electronic linear accelerator which has been built at present can provide an electron beam with energy of 120 MeV and pulse width of picosecond. The electron beam shooting at the metal targets can produce ultra-fast pulsed X-rays in the order of picosecond. In this paper, the pulse X ray characteristics are studied through simulating electron beam shooting at four metal targets with different thickness of Au, Ta, U, W and Pb by MCNPX program. The calculation shows that the X-rays can reach about 1010p/pulse and the pulse width can reach about picosecond level, when the pulsed electron beams with energy of 120 MeV ,charge of 0.5nC and pulse width of picosecond shooting at Ta targets. The yield and time width of pulsed X-rays are related to the diameter and thickness of the target.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO021  
About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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FR2A02 Commissioning of the European XFEL FEL, MMI, operation, linac 994
 
  • D. Nölle
    DESY, Hamburg, Germany
 
  The construction of the European XFEL has been finished at the end of 2016 and commissioning has been started. Meanwhile the entire facility, driving 3 free-electron-lasers in the hard and soft X-ray regime, is in operation. This contribution will report on commissioning and transition to operation, as well as on the first user runs.  
slides icon Slides FR2A02 [11.022 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-FR2A02  
About • paper received ※ 04 September 2018      issue date ※ 18 January 2019  
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