ESR MICROSCOPE HAVERSINE GRADIENT COIL DRIVER UPGRADE

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 我们升级16 GHz脉冲ESR显微镜的一个重要目标是提高组成该仪器的电子子系统的可靠性。为了避免因现有半正弦梯度线圈驱动器的可靠性参差不齐而导致未来显著的额外停机时间，该子系统已被拆卸，并重新设计和重建了关键部分。自重建以来，我们没有经历过由于这个单元而造成的任何进一步的操作中断。升级部分包括隔离功率转换器、MOSFET驱动器、输出网络的重构和对窄带z轴恒流驱动器的反馈网络修改以增强稳定性。在进行这些升级过程中开发的工程改进目前正应用于设计和建造具有更高峰值功率能力的下一代混合梯度驱动系统。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. A significant goal of our upgrade effort for the 16GHz pulse ESR microscope has been improving the reliability of electronic sub-systems which comprise this instrument. To avoid significant additional future downtime caused by spotty reliability of the existing haversine gradient coil driver, this subsystem has been disassembled and critical sections have been redesigned and rebuilt. Since the rebuild, we have not experienced any further operational interruptions due to this unit. Upgraded sections include the isolation power converters, the MOSFET drivers, reconstruction of the output network and feedback network revisions to the narrow-band z-axis constant-current driver for stability enhancement. Engineering refinements developed in the course of making these upgrades are presently being applied to design and construction of next-generation hybrid gradient driver systems of higher peak power capability.