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Permanent Magnet Quadrupole for Final Focus Lens in a Linear Collider

用于线性对撞机中最终聚焦透镜的永磁四极杆

基本信息

批准号：
14204023
负责人：
IWASHITA Yoshihisa
金额：
$ 35.44万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14204023/
关键词：
linear collider final focus lens magnetically saturated iron super strong permanent magnet extended Halbach configuration quadrupole magnet multipole magnet 飽和鉄リニアーコーライダー

项目摘要

Super strong permanent magnet technology reaches as strong as up to 5.5T with the extended Halbach configuration, which partially replaces permanent magnet by soft magnet material. Although superconducting magnets can generate stronger field than even super strong permanent magnets, they are not superior when the number of poles is more than four, because of their dead space caused by coil bobbin and cryostat. Thus we have investigated the feasibility of the Super strong Permanent Magnet Quadrupole(PMQ) as a final focus doublet for a linear collider.The first prototype PMQ fabricated with the extended Halbach configuration achieved the strong field gradient of a world record as a permanent magnet on the first FY, which proved the principle of the extended super strong permanent magnet technology on a quadrupole magnet.The variable PMQ, whose feature is required as a component of an optics, was designed and fabricated in second FY. The double ring structure is adopted, where the outer ring is rotated while the inner ring is fixed to minimize the shift of magnet center. The rotation angle positions are restricted only at 0 and 90 degrees to eliminate the skewing effect. This variable PMQ was measured in the third FY at SLAC. It is found that1)the strength is fairly high, 2)the dynamic range of the variability is more that 5 times, 3)positional reproducibility of the magnetic center is better than 3 μm.The field gradient can be further raised by reducing the bore size of the inner ring. Such an inner ring was fabricated in the last year. A new magnet measurement system with a rotation coil was designed and some of the parts were fabricated within the last year.

超强永磁技术，通过扩展Halbach配置，强度高达5.5T，用软磁材料部分替代永磁。尽管超导磁体可以产生比超强永磁体更强的磁场，但当磁极数量超过四时，由于线圈骨架和低温恒温器造成的死区，超导磁体并不优越。由此，我们研究了超强永磁四极杆（PMQ）作为直线对撞机最终焦点双合透镜的可行性。采用扩展Halbach配置制造的第一台原型PMQ在首个FY就实现了永磁体世界纪录的强场梯度，证明了四极磁体上扩展超强永磁技术的原理。变量PMQ，其特征为作为光学器件所需的组件，是在第二财年设计和制造的。采用双环结构，外环旋转，内环固定，最大限度地减少磁体中心的偏移。旋转角度位置仅限于 0 度和 90 度，以消除倾斜效应。这个变量 PMQ 是在 SLAC 第三个财年测量的。结果发现：1）强度较高，2）动态变化范围大于5倍，3）磁心位置再现性优于3μm。通过减小内环孔径，可以进一步提高磁场梯度。这样的内环是去年制造的。设计了一种带有旋转线圈的新型磁体测量系统，并在去年制造了一些零件。