43 research outputs found

    Cosmic ray tests of a GEM-based TPC prototype operated in Ar-CF4-isobutane gas mixtures

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    Argon with an admixture of CF4 is expected to be a good candidate for the gas mixture to be used for a time projection chamber (TPC) in the future linear collider experiment because of its small transverse diffusion of drift electrons especially under a strong magnetic field. In order to confirm the superiority of this gas mixture over conventional TPC gases we carried out cosmic ray tests using a GEM-based TPC operated mostly in Ar-CF4-isobutane mixtures under 0 - 1 T axial magnetic fields. The measured gas properties such as gas gain and transverse diffusion constant as well as the observed spatial resolution are presented.Comment: 22 pages, 18 figures. Published in Nuclear Instruments and Methods in Physics Research A. Fig. 3 in the introduction was corrected since it had not been properly normalized. Minor corrections and no changes in the conclusio

    Pulmonary embolism is an important cause of death in young adults

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    ArticleCIRCULATION JOURNAL. 71(11): 1765-1770 (2007)journal articl
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