Development of high durability carbonfoils against 2000K

通过以下几方面的研究，我们成功地研制出了用于高能强流加速器的混合厚硼碳剥离箔。研制了一种新型的双可控直流电弧放电蒸发源，并将其安装在EBK-2000型真空蒸发器上，用于制备混合碳剥离箔。我们还在东京工业大学的货车Dee Graaff加速器上设计了一个新的真空室，用于测量碳膜的寿命。（Japan Proton Accelerator Research Complex）为300 ~ 500μg/cm ^2。通过mCADAD方法可获得的最大厚度为约200 μg/cm^2。2，这是由于迄今为止载玻片基底和沉积层之间的粘附性如此低。为了克服这一问题，我们曾尝试在石墨棒中掺入Be、B、Si、Al等轻元素，其中硼掺杂石墨棒制成的箔显示出良好的导电性和抗腐蚀性。 关于我们 生产重现性好，使用寿命较长。用货车迪格拉夫加速器产生的3.2 MeV 3.0 μA Ne ~+离子束测量了厚度约为350 μg/cm ~ 2的杂化碳膜的寿命。为了比较，我们还测量了从日本科比钢铁公司和住友电气工业有限公司获得的360- 650μg/cm ^2的金刚石箔。我们还测量了由蒸发-冷凝制成的300-400 μg/cm ^2的市售箔（CM-箔），结果表明，HBC-箔具有8100 mC/cm ^2的极长寿命，这相当于CM -箔和金刚石箔的最大寿命的至少338倍和84倍。即使在长时间的束轰击期间在1800 K的高温下，HBC箔也显示出没有出现任何收缩，并且显示出小于20%的低厚度减少。通过寿命测量，我们观察到金刚石薄膜在1800 K左右转变为石墨晶体。少

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