分类： 物理学 >> 核物理学 提交时间： 2016-09-13
摘要： The robust conjugate direction search (RCDS) method has high tolerance to noise in beam experiments. It has been demonstrated that this method can be used to optimize the machine performance of a light source online. In our study, taking BEPCII as an example, the feasibility of online tuning of the luminosity in a circular collider is explored, through numerical simulation and preliminary online experiments. It is shown that the luminosity that is artificially decreased by a deviation of beam orbital offset from optimal trajectory can be recovered with this method.
分类： 物理学 >> 核物理学 提交时间： 2025-03-31
Pan, Weimin
Zhou, Wenzhong
He, Feisi
Ge, Rui
Xu,Miaofu
Mi, zhenghui
Dai, Jin
Han, Ye
Li,Mei
Xie,Zhexin
Liu, ming
Wang, Qunyao
Lin,Haiying
Liu,Baiqi
Wang,Xiaolong
He,Zhenqiang
Huang, Tongming
Ma,Qiang
Chen,Xu
Sang,Minjing
摘要： The China Spallation Neutron Source (CSNS) is the fourth pulsed accelerator-driven neutron source in theworld, and it achieved its design target of 100 kW in 2020. The planned China Spallation Neutron Source PhaseII (CSNS-II) is set to commence in 2024. The CSNS-II Linac design mainly involves adding a Radio FrequencyIon Source and a section of a superconducting linear accelerator composed of two types of superconductingcavities, namely double-spoke cavities and 6-cell elliptical cavities, after the Drift Tube Linac (DTL) . Thedevelopment of the double-spoke superconducting cavity began in early 2021, and by January 2023, the welding,post-processing, and vertical tests of two 324 MHz double-spoke cavity prototypes had been completed, withvertical test gradients of 11.6 MV/m and 15 MV/m, and Q0 ≥ 3 × 1010 @ Eacc ≤10 MV/m. The RD of thecryomodule began in January 2022. In October 2023, the clean assembly of the double-spoke cavity string andthe cold mass installation of the cryomodule commenced,and it took two months to complete the installation ofthe cryomodule and valve box. In January 2024, the horizontal test of the cryomodule was completed, makingit the first double-spoke cavity module in China. The test results showed that the maximum gradients of the twosuperconducting cavities at a pulse width of 4 ms and a repetition frequency of 25 Hz were 12.8 MV/m and 15.2MV/m, respectively. This article provides a detailed introduction to the double-spoke superconducting cavity,tuner, coupler, and cryomodule, and elaborates on the clean assembly of cavity string and cold mass installationof the cryomodule, concluding with a detailed analysis of the horizontal test results.
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