A closed loop system to control transverse deformations in LHC collimators
A closed loop system to control transverse deformations in LHC collimators
复制标题
控制 LHC 准直器横向变形的闭环系统
DOI：
10.1016/j.nima.2023.168128
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Furness T
中科院分区：
文献类型：
--
作者：
Furness T
提出了一种用于大型强子对撞机(LHC)二级准直器热变形检测和控制的新型闭环控制系统。从循环束芯横向丢失的伪粒子与构成准直器活动区的准直器钳口之间的相互作用将导致这些钳口的热致变形。这种相互作用可能会使钳口的直线度超出公差，迫使钳口进入梁芯或远离梁芯。这一动作可能导致光束清洁效率的降低和光束上的阻抗的增加。虽然要避免在任一方向上的变形，但进入梁的变形被认为是更大的问题，因为如果梁的损失太高，太大的变形可能会引起梁的倾倒。为了最大限度地减少这种不可避免的热效应，开发了一种新型的自适应闭环监测和驱动系统，该系统由多个本征的法布里-珀罗涉(IFPI)光学传感器和多个集成的压电堆驱动器组成。在操作时，该系统可以瞬时监测爪子的直线度，并在需要时纠正高达500μm的变形。此外，还讨论了将该系统用作主动阻尼器以减少振动响应的后续步骤，如爪子受到梁的直接撞击时所经历的步骤。
This work presents a novel closed-loop control system for the detection and control of thermal deformations integrated in the secondary collimators of the Large Hadron Collider (LHC). Interactions between spurious particles lost transversally from the circulating beam core and the collimator jaws that make up the active area of the collimator will result in thermally induced deformations in those jaws. This interaction can push the jaw’s straightness out of the tolerance and force the jaw either into the beam core or away from it. This action can result in reductions in beam cleaning efficiency and increases in impedance on the beam. Whilst deformations in either direction are to be avoided, deformations into the beam are considered more of an issue as too much deformation can provoke beam dumps if beam losses are too high. To minimize this unavoidable thermal effect a novel adaptive closed-loop monitoring and actuation system, comprising of multiple intrinsic Fabry–Pérot interferometric (IFPI) optical sensors, and several integrated piezoelectric stack actuators, has been developed. When operating, this system can transiently monitor the jaws straightness and when required correct for deformations up to 500 μ m. In addition, subsequent steps to use this system as an active damper to reduce vibratory response, as experienced when the jaw undergoes a direct beam impact, are also discussed.
登录
查看更多内容
光束撞击大型强子对撞机准直器期间颚光束角度影响的热机械评估
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
M. Cauchi;R. Assmann;A. Bertarelli;F. Carra;L. Lari;A. Rossi;P. Mollicone;N. Sammut
通讯作者：
N. Sammut
使用宽带干涉测量的灵活标距本征光纤应变传感器[邀请]。
DOI：
10.1364/josaa.403294
发表时间：
2020
期刊：
Journal of the Optical Society of America. A, Optics, image science, and vision
影响因子：
--
作者：
Williamson J
通讯作者：
Williamson J
CERN 大型强子对撞机的保护
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
R. Schmidt;R. Assmann;E. Carlier;B. Dehning;R. Denz;B. Goddard;E. Holzer;V. Kain;B. Puccio;Benjamin Todd;J. Uythoven;J. Wenninger;M. Zerlauth
通讯作者：
M. Zerlauth
HL-LHC 准直器设计的机械稳健性
DOI：
--
发表时间：
2019
期刊：
Journal of Physics: Conference Series
影响因子：
--
作者：
F. Carra;A. Bertarelli;G. Gobbi;J. Guardia;M. Guinchard;F. Harden;M. Pasquali;S. Redaelli;E. Skordis
通讯作者：
E. Skordis
大型强子对撞机准直器对质子和离子束撞击的热机械响应
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
M. Cauchi;R. Assmann;A. Bertarelli;F. Carra;F. Cerutti;L. Lari;S. Redaelli;P. Mollicone;N. Sammut
通讯作者：
N. Sammut