流强探测器发热分析及改善方法

基金项目:

National Natural Science Foundation of China 11505196

Thermal analysis and solutions of new parametric current transformer in BEPC Ⅱ

Key Laboratory of Particle Acceleration Physics & Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Funds:

National Natural Science Foundation of China 11505196

摘要: BEPCⅡ新参量流强探测器在束流高流强对撞模式下存在严重发热问题。为了稳定和精确的测量，对可能的发热原因进行了综合讨论，针对真空盒发热问题利用CST进行尾场模拟，以本征模计算得到稳态温度分布。对探测器发热问题利用等效的反射阻抗计算方法得到陶瓷狭缝的截止频率，从而有针对性地提出了实用的解决方案并得到了理想的实验结果。实验基本解决了BEPCⅡ探测器的发热问题，对今后流强探测器的改进和未来流强探测器的研发和设计有指导意义。
- CST /
- 流强探测器 /
- 发热 /
- BEPCⅡ
Abstract: The new parametric current transformer (NPCT) in BEPC Ⅱ has heating problem in high current collide mode.To find the causes and perform stable and precise measurement, wakefield simulation and eigenmode calculation have been carried out by CST, and the steady-state temperature distribution is calculated.The cut-off frequency of ceramic gap is obtained by equivalent reflection-impedance calculation.A practical solution is put forward according to the analysis, and ideal experimental results are obtained.The experiment basically solves the heating problem, it could be a guide for current transformer (CT) improvement and applied to CT designs in the future.
- CST /
- new parametric current transformer /
- heating problem /
- BEPC Ⅱ

Figure 1. NPCT vacuum chamber structure

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Figure 2. CST vacuum model and field distribution of simulation

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Figure 3. NPCT model and static temperature distribution in CST

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Figure 4. Beam spectrum in collision mode

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Figure 5. NPCT measurement principle and equivalent circuit

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Figure 6. Kapton foil and conductive layer

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Figure 7. Beam current(①), sensor temperature(②), chamber temperature(③) before and after adding the capacitor

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Table 1. Vacuum chamber parameters

component	material	data
pipe	steel 316	inner diameter: 96 mm, outer diameter: 111 mm
water interlayer	water	thickness: 2 mm
ceramic gap	95%Al₂O₃	width: 15 mm
seal ring	Kovar	\\

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