• Title/Summary/Keyword: J-STAGE

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Experimental Study on a GM-type Two-Stage Pulse Tube Refrigerator for Cryopump Applications

  • Lee, S.J.;Hong, Y.J.;Park, S.J.;Kim, H.B.;Kwon, S.B.
    • Progress in Superconductivity and Cryogenics
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    • v.9 no.2
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    • pp.35-38
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    • 2007

  • A single-stage and two-stage pulse tube refrigerators have been designed for cryopump application. The different diameters of pulse tube and regenerator have been investigated at single-stage pulse tube refrigerator(PTR). Experiments have been performed on single-stage PTR to reach minimum temperature with optimum valve opening at a few frequencies. And the two-stage pulse tube refrigerators have been assembled with tested single-stage pulse tube and tested. When orifice turn is opened to 9 and double inlet is opened to 3 at a single-stage, the lowest temperature of 33.7 K is achieved. The cooling capacity at single-stage is 38 W at temperature of 80 K. A two-stage pulse tube refrigerator has 16.3K at the second stage and 59.7K at the first stage. The cooling capacity achieved is 16.5 W at 80 K, the first stage and 0.6 W at 20 K, the second stage. Some details on the design of pulse tube refrigerator and the experimental apparatus are given.

  • https://doi.org/10.9714/psac.2007.9.2.035 인용 PDF KSCI

A Numerical Analysis for Optimum Design of Multi-Stage Amplifier System of High Power Dye Laser (고출력 색소 레이저의 다단 증폭 시스템의 최적설계에 관한 수치해석)

  • 고도경
    • Korean Journal of Optics and Photonics
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    • v.4 no.3
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    • pp.281-288
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    • 1993

  • We have investigated the output characteristics and optimal conditions of a multi-stage amplifier system of Rhodamine 6G dye laser. The parameters in this simulation work were the beam diameter of the dye laser oscillator, the size of dye cell, the dye concentration, the number of stages in the amplifier system, and the pumping energy ratio of each amplifier at given pump energy. As a result, the output energy 10 mJ and the conversion efficiency of 40% in the two stage amplifier system were obtained with the pumping energy of 25mJ and the oscillator energy of 0.01 mJ.

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Study on Micro Endmilling Process for Manufacturing of Very Small Gear Parts and Mold with Two-Stage (미소 2단 기어 부품 금형 가공을 위한 마이크로 엔드밀링 공정기술 연구)

  • Je, T.J.;Noh, J.S.;Kim, B.D.;Kim, J.G.;Yoon, J.S.
    • Transactions of Materials Processing
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    • v.19 no.2
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    • pp.107-112
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    • 2010

  • A multi-stage gear mold including gears of 2mm and 1.5mm diameter was designed and machined in this research for developing micro gear mold manufacturing technology with micro endmill. Mechanical shapes having differential micro teeth were analyzed to be formed as designed and processing conditions were optimized by analyzing machined surface chip and cutting force. Based on the results, a prototype of micro multi-stage gear mold was manufactured.

  • https://doi.org/10.5228/KSPP.2010.19.2.107 인용 PDF KSCI