Further Characterization of 394-GHz Gyrotron FU CW GII with Additional PID Control System for 600-MHz DNP-SSNMR Spectroscopy
Further Characterization of 394-GHz Gyrotron FU CW GII with Additional PID Control System for 600-MHz DNP-SSNMR Spectroscopy
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带有用于 600 MHz DNP-SSNMR 光谱的附加 PID 控制系统的 394 GHz 回旋管 FU CW GII 的进一步表征
DOI：
10.1007/s10762-016-0276-7
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Toshitaka Idehara
中科院分区：
文献类型：
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作者：
Keisuke Ueda;Yoh Matsuki;Toshimichi Fujiwara;Yoshinori Tatematsu;Isamu Ogawa;Toshitaka Idehara
日本福井大学设计了一台394 GHz回旋管FU CW GII，用于600 MHz共振频率的动态核极化（DNP）增强固态核磁共振（SSNMR）实验。在日本大坂大学蛋白质研究所（IPR）安装后，配备了PID反馈控制系统来调节电子枪加热器电流以稳定电子束电流，这最终实现了在连续波（CW）模式下操作时输出功率的稳定。在进一步优化工作条件的探索过程中，通过改变固定磁场下的工作电压，观察到约1 GHz的连续调谐带宽。在正DNP增强所需的频率范围内，通过从其初始操作设置增加磁场和操作电压来提高输出功率。此外，通过改变腔冷却水的温度，输出频率的微调被证明。这些操作条件和辅助增强预计将有助于进一步增强SSNMR信号。
A 394-GHz gyrotron, FU CW GII, has been designed at the University of Fukui, Japan, for dynamic nuclear polarization (DNP)-enhanced solid-state nuclear magnetic resonance (SSNMR) experiments at 600-MHz1H resonant frequency. After installation at the Institute for Protein Research (IPR), Osaka University, Japan, a PID feedback control system was equipped to regulate the electron gun heater current for stabilization of the electron beam current, which ultimately achieved stabilization of output power when operating in continuous wave (CW) mode. During exploration to further optimize operating conditions, a continuous tuning bandwidth of approximately 1 GHz was observed by varying the operating voltage at a fixed magnetic field. In the frequency range required for positive DNP enhancement, the output power was improved by increasing the magnetic field and the operating voltage from their initial operational settings. In addition, fine tuning of output frequency by varying the cavity cooling water temperature was demonstrated. These operating conditions and ancillary enhancements are expected to contribute to further enhancement of SSNMR signal.