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MOPB082 A Preliminary Scheme for X-ray Emission Based on Micro-pulse Electron Gun ion, electron, radiation, simulation 259
 
  • Y. Yang, B.T. Li, X.Y. Lu, W.W. Tan, L. Xiao, D.Y. Yang, Z.Q. Yang, J. Zhao
    PKU, Beijing, People's Republic of China
  
  X-ray is now widely used in many areas of physics, biology, chemistry and materials. And how to achieve emission, monochrome, and focusing of x-ray is of great significance to study. Micro-pulse electron gun (MPG) is a new type of electron source, with characteristics of high repetition frequency, short-pulse and low cost. Generating x-ray with better monochromaticity is one of the potential applications of MPG. And a preliminary scheme of X-ray based on MPG is proposed in this paper. The scheme is designed by comparing different anode materials and the thickness of filters. The simulation results based on the software MCNP5 show that the proposed scheme can effectively improve the monotonicity of the generated X-rays.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB082  
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TUPB035 Frequency Pre-tuning of the 166.6 MHz Proof-of-principle SRF Cavity for HEPS-TF cavity, ion, simulation, SRF 459
 
  • P. Zhang, H.X. Hao, Z.Q. Li, X.Y. Zhang
    IHEP, Beijing, People's Republic of China
  
  Funding: This work has been supported by HEPS-TF project and also partly supported by Pioneer 'Hundred Talents Program' of Chinese Academy of Sciences.
A 166.6 MHz proof-of-principle SRF cavity has been designed for the High Energy Photon Source - Test Facility (HEPS) at IHEP in Beijing. The cavity is a β=1 quarter-wave resonator made of bulk niobium operating at 4 K. A pre-tuning scheme was made to accommodate the cavity frequency shift mainly due to mechanical tolerances during cavity production, the subsequent surface treatment and cooldown process. To this end, the length of the cavity outer conductor was chosen as a free parameter for the pre-tuning. The cavity frequency was carefully monitored during the production, post-processing steps and vertical test. The measurement results agree well with our calculations. It is worth noticing that the pre-tuning method only involves one-time measurement of the cavity resonant frequency and its outer conductor length. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB035  
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TUPB055 Nb3Sn Thin Film Deposition On Copper By DC Magnetron Sputtering ion, SRF, cavity, niobium 512
 
  • W.W. Tan, B.T. Li, X.Y. Lu, L. Xiao, D. Xie, D.Y. Yang, Y. Yang, Z.Q. Yang, J. Zhao
    PKU, Beijing, People's Republic of China
  
  Nb3Sn for SRF cavities has been coated on copper samples by DC magnetron Sputtering. Pure Nb target and pure Sn target were installed separately in the magnetron sputtering device. Nb3Sn precursor was coated on copper in the Ar atmosphere of 0.5 Pa. The Nb3Sn precursor was annealed in the vacuum furnace whose pressure is 10-4 Pa. The XRD results demonstrate the exist of Nb3Sn crystal, and MPMS results show superconductivity of Nb3Sn. The highest critical temperature obtained is 15K.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB055  
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TUPB083 Post Processing of a 166.6 MHz HEPS-TF Cavity at Institute of High Energy Physics cavity, ion, SRF, photon 583
 
  • J. Dai, Z.Q. Li, P. Zhang
    IHEP, Beijing, People's Republic of China
  
  Funding: Work supported by High Energy Photon Source Test Facility (HEPS-TF) project
A 166.667 MHz Proof-of-Principle (PoP) superconducting RF cavity has been fabricated by IHEP for the High Energy Photon Source Test Facility (HEPS-TF) [1]. After a series of post-processing including chemical etching (BCP), high temperature heat treatment, High Pressure water Rinsing (HPR) and 120°C baking, the cavity was cold RF tested and reached Epeak=86.5 MV/m and Bpeak=132.1 mT with Q0=5.1×〖10〗8 at 4.2K. The cavity was RF tested again at 2K, and reached Epeak=85.5 MV/m and Bpeak=131.1 mT with Q0=3.3×〖10〗9.
daijin@ihep.ac.cn 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB083  
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THPB075 GaN-based Photocathodes for High Brightness Electron Beams ion, cathode, electron, experiment 906
 
  • M. Schumacher, X. Jiang, M. Vogel
    University Siegen, Siegen, Germany
  
  Funding: This research is funded by the Federal Ministry of Education and Research of Germany in the framework of HOPE II (project number 05K16PS1).
Prospective light sources requires photocathodes with high quantum efficiency (QE), long lifetime and minimized thermal emittance. One promising candidate meeting the aforementioned specifications is GaN. Due to its wide band gap (Eg = 3,4 eV), GaN can be excited by UV-light sources. Its thermal and chemical stability are added bonuses. In the framework of the present activity, the synthesis of GaN films on Si, Cu, Mo and Nb by means of rf magnetron sputtering is proposed. In this context, Ga, GaAs and GaN are suitable source material candidates, which are sputtered in a nitrogen/argon plasma discharge. The conductivity as well as the band-gap of the corresponding films can be modified by dopants like Mg and In, respectively. Standard materials science characterization techniques such as SEM, EDX, XRD or XPS are used to explore the growth mechanism of GaN alongside with a morphological and chemical examination. To assess and optimize the performance of the photocathode the abovementioned requirements are tested in an in-situ setup. In addition to the project outline, first experimental results of GaN coatings synthesized based on a GaAs source sputtered in pure N2 are presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB075  
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THPB077 Design Study of Mushroom Shaped Cavity for Evaluation of RF Critical Magnetic Field of Thin-film Superconductor cavity, ion, electromagnetic-fields, insertion 914
 
  • H. Oikawa
    Utsunomiya University, Utsunomiya, Japan
  • H. Hayano
    KEK, Ibaraki, Japan
  • T. Higashiguchi
    Center for Optical Research and Education, Utsunomiya University, Utsunomiya, Japan
  
  For future accelerator, superconducting RF cavity has high gradient of 45 MV/m or more is demanded. To obtain such a higher gradient, there has been proposed a method of increasing an RF critical magnetic field of the cavity inner surface by coating of multi-layer thin-film superconductor. Their thickness is close to the London penetration depth. By producing a multilayer film structure in cavity inner surface, it is believed to improve the RF critical magnetic field, and to connect directly to high gradient. To demonstrate a creation of a thin film on a surface of Nb samples, an RF cavity with a thin film coated Nb sample is needed to measure the RF critical field of the sample. To adapt it to the cavity, to cool to cryogenic temperature and to establish the sample to supply the RF power, it is necessary to design a cavity to produce a strong RF magnetic field parallel to the surface of the thin film sample. We designed a mushroom shaped cavity made of Nb and input coupler. Resonant frequency is 5.2 GHz by calculation. We calculated the resonant frequency and the field distribution, compared with the measured values for the model cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB077  
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