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Development of high durability carbonfoils against 2000K

开发2000K高耐久性碳箔

基本信息

批准号：
15340086
负责人：
SUGAI Isao
金额：
$ 9.41万
依托单位：
High Energy Accelerator Organization Laboratory (2004)The High Energy Accelerator Research Organization (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

We have successfully developed hybrid, thick, boron mixed carbon stripper foils for high energy and high intensity accelerators through following investigations. We have developed new type two controlled DC arc-discharge evaporation sources for the preparation of hybrid carbon striper foils and installed the two evaporation sources into an EBK-2000 vacuum evaporator. We have also designed a new vacuum chamber for lifetime measurement of carbon foils at the Van Dee Graaff accelerator of Tokyo Institute of Technology.Required thickness of carbon stripper foils for J-PARC (Japan Proton Accelerator Research Complex ) is 300〜500μg/cm^2.The maximum thickness obtainable by the mCADAD method was about 200 μg/cm^2 due to so low adhesion between the slide glass substrate and the deposition layer so far. In order to get over this problem, we have tried to mix some light elements in graphite rod, for example, Be, B, Si and Al etc. Among these elements, foils made by boron mixed graphite rod showed … More good reproducibility in production and comparatively long lifetime. The Hybrid carbon foils made by thus is called HBC-foils.We measured lifetime of the HBC-foils of about 350 μg/cm^2 thick with 3.2 MeV 3.0 μA Ne+ ion beam from the Van dee Graff accelerator. For comparisons, we measured also Diamond foils of 360- 650μg/cm^2 obtained from Kobe Steel Company and Sumitomo Electric Industry Lted, in Japan. We also measured commercially available foils (CM-foils) of 300-400 μg/cm^2 which made by evaporation-condensation.The result, showed that the HBC-foils indicated extremely long lifetime of 8100 mC/cm^2, which correspond to at least 338 times in maximum and 84 times longer than than that of CM -foils and diamond foils. The HBC-foils showed also did not appear any Shrinkage and show low thickness reduction of less than 20 %, even at high temperature of 1800 K during the long time beam bombardment. Through this lifetime measurement, we observed the Diamond foil changed into the graphite crystalline at about 1800 K. Less

通过以下研究，我们成功地开发出了用于高能、高强度加速器的混合、厚、硼混合碳汽提箔。我们研制了用于制备混合碳条带材的新型双控直流弧光蒸发源，并将其安装在EBK-2000型真空蒸发器中。我们还在东京工业大学范迪格拉夫加速器上设计了一种用于碳箔寿命测量的新真空室。日本质子加速器研究中心(J-PARC)所需的碳膜剥离厚度为300~500μg/cm2。由于目前载玻片与沉积层之间的附着力很低，MCADAD方法所能获得的最大厚度约为200μg/cm2。为了解决这一问题，我们尝试在石墨棒中掺入一些轻元素，如Be、B、Si、Al等，其中用硼混合石墨棒制成的铝箔表现出…生产重现性好，使用寿命较长。我们在范迪格拉夫加速器上用3.2MeV3.0μA Ne+离子束测量了厚度为350MeV3.0μA Ne+的HbC膜的寿命。为了进行比较，我们还测量了从日本神户制钢公司和住友电机工业株式会社获得的360-650μg/cm^2的金刚石箔。我们还测量了由蒸发-冷凝方法制成的300-400μg/cm~2的商用铝箔(CM-箔)。结果表明，HBC-箔的寿命达到了8100MC/cm~2，相当于CM-箔和金刚石箔的最大寿命至少338倍和84倍。即使在1800K的高温下，长时间束流轰击下，HBC-箔也没有出现任何收缩现象，厚度缩减率小于20%。通过寿命测量，我们观察到在低于1800K时，金刚石箔转变为石墨晶体