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R＆D of Niobium Copper Clad Seamless Superconducting RF Cavities

铌铜包无缝超导射频腔的研发

基本信息

批准号：
11694182
负责人：
SAITO Kenji
金额：
$ 10.92万
依托单位：
High Energy Accelerator Research Organization
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

For high-energy physics in the next generation, an electron/positron linear collider with a colliding beam energy 500-1000 GeV at center of mass is required. Superconducting linear accelerator : TESLA is one candidate as such a machine. Now DESY is promoting the TESLA future plan by international collaboration. With TESLA, main issues are 1) to develop high gradient superconducting RF cavities with a higher field gradient than 25 MV/m and 2) to fabricate such excellent cavities cost effectively. To date KEK has developed high gradient cavities with 40 MV/m by KEK original technology : horizontally rotating continuous electropolishing, which was developed in TRISTAN sc project.By such a background of our sc cavity R&D, we propose an idea for the second R＆D issue, in which one uses niobium copper clad tubes to hydro-form sc cavities. This method will lead to a considerable material reduction with expensive niobium and eliminating the complicated and expensive electron beam welding in cavity fabrication process, thus results in cost effective cavity production. One aim of this research program is to investigate how works the niobium (Nb)/copper (Cu) clad cavity by international collaborations between KEK and INFN-LNL in Italy, DESY in Germany and TJNAF in USA. In this study, we have successfully fabricated a high gradient Nb/Cu clad cavity with 40MV/m and demonstrated our idea is excellent.Another purpose is to develop a long clad tube for future multi-cell cavities. We proposed to make a Cu/Nb/Cu sandwiched tube by HIP bonding, then to elongate it using established tube drawing technique. We have successfully made a long clad tube. We have made Nb/Cu clad seamless cavities from the tube. Finally we estimated the fabrication cost for a Nb/Cu 9-cell cavity. The result says the price will be cheaper by a factor three comparing with electron beam welding niobium bulk cavity.

对于下一代的高能物理学，需要一个电子/正电子直线对撞机，其碰撞束能量在质心处为500-1000 GeV。超导直线加速器：TESLA是这样的机器的候选者之一。目前，DESY正在通过国际合作推动TESLA未来计划。对于TESLA，主要问题是1）开发具有高于25 MV/m的场梯度的高梯度超导RF腔，以及2）成本有效地制造这种优异的腔。目前，KEK公司已经成功地利用TRISTAN超导项目中开发的水平旋转连续电解抛光技术，研制出了40 MV/m的高梯度超导腔。基于我们超导腔的研发背景，我们提出了第二个研发课题的设想，即利用铌铜复合管液压成形超导腔。这种方法将导致大量减少昂贵的铌的材料，并消除腔制造过程中复杂和昂贵的电子束焊接，从而导致成本有效的腔生产。本研究计划的目的之一是通过意大利的KEK和INFN LNL，德国的DESY和美国的TJNAF之间的国际合作来研究铌（Nb）/铜（Cu）包层腔的工作原理。在本研究中，我们成功地制作了一个高梯度的Nb/Cu包层腔，具有40 MV/m，证明了我们的想法是优秀的，另一个目的是为未来的多电池腔开发长包层管。我们提出了一种Cu/Nb/Cu夹层管的热等静压连接，然后使用已建立的管拉伸技术将其拉伸。我们已经成功地制造出了一个长的包层管。我们已经从管的Nb/Cu复合无缝腔。最后，我们估算了Nb/Cu 9腔的制造成本。结果表明，与电子束焊接铌体腔相比，价格便宜三倍。