Adjustable permanent quadrupoles for the Next Linear Collider
Adjustable permanent quadrupoles for the Next Linear Collider
复制标题
用于下一代线性对撞机的可调节永久四极杆
DOI：
10.1109/pac.2001.987474
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Z. Wolf
中科院分区：
文献类型：
--
作者：
J. Volk;J. DiMarco;G. Foster;W. Fowler;V. Kashikhin;A. Makarov;V. Tsvetkov;C. Rago;A. Ringwall;C. Spencer;Z. Wolf
拟议中的下一代直线对撞机（NLC）将需要超过1400个可调四极之间的主直线加速器的加速器结构。这些12.7 mm孔四极杆的综合强度范围为0.6至138特斯拉，最大梯度为141特斯拉/米，调整范围为+0至-20%，有效长度为324 mm至972 mm。在20%的调整过程中，磁性中心必须保持稳定，在1微米以内。为了降低成本和增加可靠性，已经开发了使用混合永磁体的几种设计。已经制造了四种不同的原型。所有的磁铁都有铁磁极，并使用钐钴来提供磁场。两个使用旋转永磁材料来改变梯度，一个使用滑动分流器来改变梯度，第四个使用反向旋转磁体。初步数据的梯度强度，温度稳定性，和磁中心位置的稳定性。这些数据进行了比较，一个等效的电磁原型。
The proposed Next Linear Collider (NLC) will require over 1400 adjustable quadrupoles between the main linacs' accelerator structures. These 12.7 mm bore quadrupoles will have a range of integrated strength from 0.6 to 138 Tesla, with a maximum gradient of 141 Tesla per meter, an adjustment range of +0 to -20% and effective lengths from 324 mm to 972 mm,. The magnetic center must remain stable to within 1 micron during the 20% adjustment. In an effort to reduce costs and increase reliability, several designs using hybrid permanent magnets have been developed. Four different prototypes have been built. All magnets have iron poles and use samarium cobalt to provide the magnetic fields. Two use rotating permanent magnetic material to vary the gradient, one uses a sliding shunt to vary the gradient and the fourth uses counter rotating magnets. Preliminary data on gradient strength, temperature stability, and magnetic center position stability are presented. These data are compared to an equivalent electromagnetic prototype.