• Title, Summary, Keyword: Vacuum chamber

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Simulation of Vacuum Characteristics of High Vacuum System Modelled by VacCAD

  • Kim, Hyungtaek;Park, Junhyung;Yun, Gyeongah
    • International journal of advanced smart convergence
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    • v.7 no.4
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    • pp.84-91
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    • 2018
  • In this paper, we simulated three different HV systems and analyzed of each vacuum characteristics by VacCAD modelling. In each of modelled vacuum systems, selection of chamber materials, combination of rough pump with high vacuum pump and conductance of roughing line (diameter and length) were proposed as system variables. In the modelling of chamber materials, the pumping times to ultimate pressures of different chamber materials (stainless steel, aluminum) were compared by the variations of chamber volume. In this model, the effects of outgassing dependent on the chamber materials was also simulated and aluminum was estimated to optimum chamber materials. It was also obtained that modelling of vane and roots pump with diffusion pump and diameter, length of $50{\times}250$ [mm]roughing line were characterized as optimum variables to reach the ultimate pressure of 10E-7 [mbar] most effectively. Optimum design factors for vacuum characteristics of modelled vacuum system were achieved by VacCAD simulations. Feasibility of VacCAD as vacuum simulator was verified and applications of VacCAD expected to be increased to fields in vacuum needed.

Vacuum Chamber Design for the PLS Storage Ring (포항 가속기 저장링 진공 chamber 설계)

  • 김창균;길계환;최우천;박수용
    • Journal of the Korean Vacuum Society
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    • v.1 no.1
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    • pp.24-27
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    • 1992
  • The Pohang Accelerator Lab is constructing a 2 GeV synchrotron radiation source. In order to achieve a beam lifetime of 5 hours or more, the average pressure in the vacuum chamber will be kept in the nano Torr range. Each chamber consists of a top and a bottom piece, which are machined separately and welded together. The chamber material is A1 5083-H321. The pumping system has nine sets of lumped NEGs in tandem with ion pumps installed beneath photon stops, and six ion pumps per superperiod. A prototype chamber will be machined by February 1992. After various tests with the prototype chamber, the vacuum chamber design will be refined.

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Study of Knudsen Pump using Vacuum Chamber and It's Upgrade Plan to Thermal Vacuum Chamber (고고도 우주환경 모사용 진공챔버를 이용한 누센펌프의 연구와 열진공챔버로의 개선 방향)

  • Kim, Hye-Hwan;Huh, Hwan-Il
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.361-364
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    • 2009
  • Vacuum facility is required for high altitude space environment test to develop small thruster to be applied for micro-satellite. After selecting vacuum equipment and integrating the chamber to simulate 100-120km attitude with max, $10^{-5}\;torr$. We tested the performance of high vacuum chamber. We designed, fabricated the knudsen pump and analyzed pressure gradient efficiency of membrane according to Knudsen number under vacuum conditions. We described the upgrade plan to a thermal vacuum chamber.

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Design of shunt structure to avoide TE mode in PLS-II storage ring vacuum chamber

  • Ju, Yeong-Do;Ha, Tae-Gyun;Park, Seong-Ju;Park, Jong-Do
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.42-42
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    • 2010
  • We, previously, proved that the noise in the vertical readback from some of beam position monitors (BPMs) in the vacuum chamber of Pohang Light Source (PLS) are caused by the transverse electric (TE) longitudinal harmonic resonances. Based on this analysis, we now design the shunt structure to remove the TE mode resonces near the BPMs operation frequency of 500 MHz in the storage ring vacuum chamber of PLS upgrade project (PLS-II). The simulation result and experimental test result will be presented.

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INVESTIGATION OF THE CNS HOLE SHAPE AND A PROPOSED INSTALLATION METHOD FOR A VACUUM CHAMBER FOR THE HANARO REACTOR

  • Cho Yeong-Garp;Kim Young-Ki;Lee Kye-Hong;Choung Yun-Hang
    • Nuclear Engineering and Technology
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    • v.38 no.5
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    • pp.455-458
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    • 2006
  • The HANARO reactor has a vertical hole for a cold neutron source (CNS) in the heavy-water reflector tank, i.e., the CNS hole, which was considerably deformed during its welding to the horizontal cold neutron (CN) beam tube. This paper presents an investigation of the form of the CNS hole for the optimal design of the a vacuum chamber for the CNS. In addition, the installation method of the vacuum chamber into the CNS hole for minimizing the water thickness between the vacuum chamber and the nose of the CN beam tube is proposed.

A Study on Chamber Wall Effect in the Satellite Thermal Balance Test (위성 열평형 시험에서 챔버 벽 영향에 관한 연구)

  • Kim, Dong-Un;Jang, Yeong-Geun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.12
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    • pp.90-95
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    • 2006
  • The wall of thermal vacuum chamber which is used for the satellite thermal balance test doesn't absorb satellite's IR emission perfectly and reflects some part of that. It is estimated that small thermal vacuum chamber has relatively larger wall effect than the big one. The small thermal vacuum chamber is required for the small satellite test to reduce the test cost. A quantitative analysis was carried out to investigate the chamber wall effect. As a result, temperature errors caused by chamber wall effect was calculated, and the temperature data acquired in the thermal balance test have been compensated. By defining the optimized area ratio between chamber surface and satellite surface area, the baseline to be able to determine the minimum size of thermal vacuum chamber was established to minimize the wall effect. Also, theoretical analysis about transparent material coating which can reduce the chamber wall effect is conducted.

Wake Field Effect from the Undulator Vacuum Chamber in PAL-XFEL

  • Park, Yong-Un
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.151.1-151.1
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    • 2014
  • Wake field effect on the electron beam from the undulator chamber in PAL-XFEL is analyzed. The wake field takeover some energy from the electron beam which will increase the energy spread of the electron beam. This will cause the degradation of the radiation power in PAL-XFEL. To decrease the effect, the surface of the undulator vacuum chamber should be fabricated with 200 nm surface roughness and 5 nm oxidation layer. In this presentation, the numerical calculation of the wake will be shown. Simulation results of the radiation generation in PAL-XFEL also will be presented.

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Design and Fabrication of a Vacuum Chamber for a Commercial Atomic Force Microscope

  • Park, Sang-Joon;Jeong, Yeon-Uk;Park, Soyeun;Lee, Yong Joong
    • Applied Science and Convergence Technology
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    • v.23 no.2
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    • pp.97-102
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    • 2014
  • A vacuum chamber for a commercial atomic force microscope (AFM) is designed and fabricated. Only minimal modifications were made to an existing microscope in an effort to work in a vacuum environment, while most of the available AFM functionalities were kept intact. The optical alignment needed for proper AFM operations including a SLD (superluminescent diode) and a photodiode can be made externally without breaking the vacuum. A vacuum level of $5{\times}10^{-3}$ torr was achieved with a mechanical pump. An enhancement of the quality factor was observed along with a shift in the resonance frequency of a non-contact-mode cantilever in a vacuum. Topographical data of a calibration sample were also obtained in air and in a low vacuum using the non-contact mode and the results were compared.

Domestic Construction of a Large Thermal Vacuum Chamber for Space Environment Simulation (우주환경모사를 위한 대형열진공챔버 국산화 구축)

  • Cho, Hyok-Jin;Moon, Guee-Won;Seo, Hee-Jun;Lew, Sang-Hoon;Choi, Seok-Weon
    • Aerospace Engineering and Technology
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    • v.6 no.1
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    • pp.64-73
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    • 2007
  • A Large thermal vacuum chamber (LTVC) for space environment simulation on large satellites was successfully developed and constructed by KARI (Korea Aerospace Research Institute) in Korea with a local company. This chamber has an effective diameter of 8 meters and depth of 10 meters, and is composed of vacuum system, thermal control system, and anti-vibration system. Temperature below $-190^{\circ}C$ is maintained over the thermal shroud wrapping a satellite under $3.7{\times}10^{-5}Pa$ ($5{\times}10^{-7}torr$) vacuum level, and optical test can be done in this chamber by seismic mass with $10^{-5}g_{rms}$ or lower vibration level. In addition, the shroud temperature can be increased up to $123^{\circ}C$ using halogen lamps. Chamber control program based on PLC (Programmable Logic Controller) could control this large thermal vacuum chamber automatically.

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