AI 中文总结
研究针对低温精密测量中传统高压馈通不可行的问题，开发卡瓦洛静电倍增器。通过机械平移电极和定制旋转场强计，在约600托SF₆中实现了从25 kV输入到约255 kV输出，证明其为可行的低电流原位高压源，明确了可靠运行的关键要求。
AI 中文摘要
许多低温精密测量在传统高压馈通不可行的环境中需要大电场。为此，我们开发了一种卡瓦洛静电倍增器，用于在此类条件下原位产生高压。本文报告了该装置在室温下的演示。使用机械平移的转移电极和定制旋转场强计进行非接触电压测量，该系统在约600托的SF₆中，从25 kV直流偏置输入电压达到了高达约255 kV的输出电压。考虑实际电极未对准后，充电曲线由基于电容的模型定量描述。电压保持测量显示长时间尺度上的皮安级泄漏电流，而接近最大电压的操作受与电极表面状况和局部场增强相关的瞬态放电过程限制，而非气体的固有介电强度。这些结果证明卡瓦洛倍增器是一种可行的低电流原位高压源，并表明电极表面处理、对准公差和绝缘性能是未来低温应用中可靠运行的主要要求。
英文摘要
Many cryogenic precision measurements require large electric fields in environments where conventional high-voltage feedthroughs are impractical. To address this, we developed a Cavallo electrostatic multiplier designed for in situ high-voltage generation under such conditions. Here, we report a room-temperature demonstration of this device. Using a mechanically translated transfer electrode and a custom rotary field mill for noncontact voltage measurement, the system reached output voltages up to approximately $255~\mathrm{kV}$ from a $25~\mathrm{kV}$ DC-biased input voltage in approximately $600~\mathrm{Torr}$ of SF$_6$. The charging curves are quantitatively described by a capacitance-based model once realistic electrode misalignment is included. Voltage-hold measurements show picoampere-scale leakage currents on long time scales, whereas operation near the maximum voltage is limited by transient discharge processes associated with electrode surface condition and local field enhancement, rather than by the intrinsic dielectric strength of the gas. These results demonstrate the Cavallo multiplier as a viable low-current, in situ high-voltage source and indicate that electrode surface preparation, alignment tolerances, and insulation performance are the principal requirements for reliable operation in future cryogenic implementations.
Comments17 pages, 12 figures
