CONTROLLED-TEMPERATURE INSERT FOR 95 GHZ CW/PULSE SPECTROMETRY

这个子项目是利用资源的许多研究子项目之一。 由NIH/NCRR资助的中心拨款提供。对子项目的主要支持 子项目的首席调查员可能是由其他来源提供的， 包括美国国立卫生研究院的其他来源。为子项目列出的总成本可能 表示该子项目使用的中心基础设施的估计数量， 不是由NCRR赠款提供给次级项目或次级项目工作人员的直接资金。 ACERT计划于2007年8月下旬安装低温9T无低温磁体和低温插件。该计划比原来的安装日期延迟了3个月。对于即将在我们现有的6T牛津磁体中对蛋白质系统进行步进频率95 GHz鹿实验的情况，我们已着手对我们早期的JOMO-I温度控制系统进行重大临时升级的规范和设计。我们目前正在组装的受控温度插件(CTI)升级包括增加一个闭环系统气体预热器部分，在现有的“环境恒温器”插件结构中建造一个低时间恒温控制加热器，以及对一个或两个真空保温式热孔“O”形环密封进行温度监测。现有的Lakeshore型号331温度控制器，在样品处有适当传感器的输入，将保留为主要温度调节系统。温度控制在0.1K下降至100K是预期的稳定性。 CTI临时升级所需的所有组件均已采购完毕，插入件结构已经过修改，可在靠近样品(7厘米)的位置安装加热器/电枢组件。目前正在建造一个机架底盘，配有前面板Omega控制器/监视器和加热器电源驱动电路，用于预热器调节和O形环密封温度监控(以及可选的控制)。我们打算在几周内完成机架式CTI预热器控制系统的建造和调试，届时控制器将安装在95 GHz磁体中，同时安装修订后的双恒温器和低温恒温器O形环密封监测器。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. ACERT is scheduled for installation of a Cryogenic, Ltd. 9T cryogen-free magnet and low-temperature insert in late August, 2007. This schedule represents a 3-month delay from the original installation date. For impending step-frequency 95 GHz DEER experiments on protein systems in our existing 6T Oxford magnet, we have therefore proceeded with specification and design of a significant interim upgrade to our earlier JOMO-I temperature control system. The Controlled Temperature Insert (CTI) upgrade that we are presently assembling consists of an added closed-loop gas pre-heater section, construction of a low time-constant temperature control heater within the existing "ambienstat" insert structure and temperature monitoring of one or both of the vacuum-retaining warm bore "O"-ring seals. The existing Lakeshore model 331 temperature controller, with input from an appropriate sensor at the sample, will be retained as the primary temperature regulating system. Temperature control down to 100¿K at 0.1¿K stability is expected. All components for the interim CTI upgrade have been acquired, and the insert structure has been modified to accept a heater/armature assembly in a position of close proximity (7 cm) to the sample. A rack chassis with front panel Omega controller/monitors and heater power driver circuitry for preheater regulation and O-ring seals temperature monitoring (and, optionally, control) is currently under construction. We intend to complete construction and debug of the rackmount CTI preheater control system within a few weeks, at which time the controller will be installed in the 95 GHz magnet in concert with the revised ambienstat and cryostat O-ring seal monitors.