• Title/Summary/Keyword: pohang

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Performance of a Prototype Sector Chamber of the PLS Storage Ring (포항 가속기 저장링 초도품 진공챔버에 대한 실험 결과)

  • Park, C.D.;Han, Y.J.;Kim, H.J.;Youn, H.S.;Choi, W.C.
    • Journal of the Korean Vacuum Society
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    • v.1 no.3
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    • pp.336-340
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    • 1992

  • 포항가속기 저장링 진공시스템의 성능을 예견하기 위하여, 초도품 진공 챔버를 제 작, 조립 및 테스트를 하였다. 비휘발성 흡착펌프와 이온펌프로 구성되어 있는 다섯대의 혼 합펌프와 한 대의 터보펌프를 사용하였다. 그 결과 낮은 10-10Torr을 얻음으로서 설계된 진 공도를 성취하였다.

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Design and Operational Charcteristics of 150MW Pulse Modulator (150MW 펄스 MODULATOR의 설계 및 동작특성)

  • Park, S.S.;Oh, J.S.;Lee, K.T.;Kim, S.H.;Son, Y.K.;Choi, K.;Chang, S.D.;Park, S.W.;Nam, S.H.;Cho, M.H.;NamKung, W.
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.928-930
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    • 1992

  • The design beam energy of PLS(Pohang Accelerator Laboratory) Linac is 2Gev. The linac employs total 11 units of modulators and klystrons. The maximum peak output powers of the modulators are 200MW (400kV, 500A, 4.4$\mu$S flat-top, 800$\Omega$ load) to drive the klystrons which have the peak microwave power of 80MW. Prior to the development of the 200MW modulators, a prototype 150MW modulator has been constructed and tested. We have achieved output pulses of 350kV, 420A and 3.5$\mu$S flat-top with 840$\Omega$ water load. In this article, the test results and computer simulations of charging, De-Q'ing, and discharging are presented.

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Synchrotron Grazing Incidence X-ray Scattering and Its Applications in Polymer Nanotechnology

  • Ree, Moon-Hor;Lee, Byeong-Du;Yoon, Jin-Hwan;Heo, Kyu-Young;Jin, Kyeong-Sik;Jin, Sang-Woo;Kim, Hyun-Chul;Kim, Gha-Hee;Choi, Seung-Chul;Oh, Weon-Tae;Park, Young-Hee;Hwang, Yong-Taek;Kim, Jong-Seong
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.120-120
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    • 2006

  • In our study grazing incidence X-ray scattering (GIXS) measurements with synchrotron radiation sources were conducted statically and in-situ for a series of nanoscale thin films prepared from nanoporous dielectrics, block copolymers, brush polymers, and molecular assemblies. All GIXS measurements were performed at the Pohang Accelerator Laboratory. The measured scattering data were analyzed in detail by using newly developed GIXS scattering theory. All GIXS results will be discussed in details with considering the materials chemistry and nanostructure formation process parameters.

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Impedance Calculation for Vacuum Components in Pohang Light Source Storage Ring

  • Ju, Yeong-Do;Lee, Byeong-Jun;Son, Yeong-Uk;Yu, In-Ha;Jeon, Myeong-Hwan;Park, In-Su;Kim, Seung-Hwan;Ha, Tae-Gyun;Gong, Hyeong-Seop;Son, Yun-Gyu;Park, Yong-Jeong;Park, Jong-Do;Nam, Sang-Hun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.151.2-151.2
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    • 2014

  • Broadband impedances for the 3-GeV pohang light source-II (PLS-II) storage ring have been numerically estimated using a full three dimensional finite-difference time-domain code, CST particle studio. The total broadband impedance of all the vacuum components was estimated as 0.256 ohm, which is a small fraction of the total machine impedance budget.

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