ELECTRO-MAGNETIC OPTIMIZATION OF A QUARTER-WAVE RESONATOR*
ELECTRO-MAGNETIC OPTIMIZATION OF A QUARTER-WAVE RESONATOR*
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发表时间：
2010
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通讯作者：
B. Mustapha;P. Ostroumov
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作者：
B. Mustapha;P. Ostroumov
正在为正在进行的ATLAS效率和强度升级设计一种新的低温恒温器。该制冷机由7个sG=0.075的四分之一波长谐振器和4个SC谐振器组成，以取代现有的开口环腔。为了减少由于颤噪效应引起的谐振器频率抖动，我们选择72.75 MHz的频率而不是60.625 MHz。在72.75 MHz时，谐振腔缩短了约20 cm。根据束流动力学和ATLAS腔的实际性能选择设计方案。为了达到每腔2.5 MV或更高的创纪录高加速电压，EM设计被仔细优化。优化的主要目标是最小化峰值磁场和电场，同时仍然保持存储能量、分流阻抗（R/Q）和几何因子（Rs*Q）的良好值。空腔高度也是另一个重要参数。优化导致最终的形状是圆柱形的底部和圆锥形的顶部保持高的房地产梯度。优化还包括光束转向校正所需的内部漂移管面角。
A new cryomodule is being designed for the ongoing ATLAS efficiency and intensity upgrade. The cryomodule consists of 7 Quarter-Wave Resonators (QWR) with sG=0.075 and 4 SC solenoids to replace the existing split-ring cavities. To reduce the resonator frequency jitter due to microphonics we choose a frequency of 72.75 MHz instead of 60.625 MHz. At 72.75 MHz, the cavity is shorter by about 20 cm. The choice of the design s was based on the beam dynamics and the actual performance of ATLAS cavities. To reach a record high accelerating voltage of 2.5 MV per cavity or higher, the EM design was carefully optimized. The main goal of the optimization was to minimize the peak magnetic and electric fields while still keeping good values for the stored energy, the shunt impedance (R/Q) and the geometric factor (Rs*Q). The cavity height was also another important parameter. The optimization has lead to a final shape which is cylindrical in the bottom and conic on the top keeping a high real-estate gradient. The optimization also included the internal drift tube face angle required for beam steering correction.