95 GHZ SPECTROMETER CRYO-FREE 9T MAGNET UPGRADE

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。子项目的主要支持 子项目的主要研究者可能是由其他来源提供的， 包括其它NIH来源。 为子项目列出的总成本可能 代表子项目使用的中心基础设施的估计数量， NCRR赠款不直接向子项目或子项目工作人员提供资金。 正如所描述的，以及我们第一年赠款更新支出中提供的分配，我们已经为ACERT 95 GHz光谱仪系统购买了一个无冷冻剂型的9 T宽口径磁体。该装置购自Cryogenic，Ltd.，英国，安装于2008年4月中旬，具有足够宽的孔以容纳大型NMR式真空温度插入件（VTI）的优点，重要的是，显著节省了制冷剂成本。磁铁系统最初预计在2007年秋季到达，但由于主线圈可靠性修改和进一步测试，其交付延迟了约6个月。虽然ACERT安装正常进行，并成功斜升到9 T，但随后主磁体电源的可靠性问题延迟了磁体系统的最终调试。然而，由于光谱仪本身目前正在重建和升级，磁体电源维修/更换停机时间不应导致任何额外的实验计划延迟。 光谱仪的设计和配置的几个方面受到向新的9 T磁体过渡的影响，目前正在解决这些问题。在机械上，电桥、谐振器和真空插件需要一个全新的支撑结构，该支撑结构也与磁体外壳物理隔离。为了满足这一要求，设计了一个基于重型挤压铝支柱的刚性框架，将于2008年夏末制造和安装。 对于场扫描控制，将创建软件模块并将其并入光谱仪控制集合中，以便与扫描电源进行通信。 由光谱仪控制系统记录临界磁体温度和磁场斜坡分布将在稍后可选地实施。

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. As described and an allocation provided for in our first year grant renewal expenditures, we have acquired a 9T wide-bore magnet of the cryogen-free type for the ACERT 95 GHz spectrometer system. This unit, purchased from Cryogenic, Ltd., U.K., was installed in mid-April, 2008 and offers the benefits of both a sufficiently wide bore to accommodate a large NMR-style vacuum temperature insert (VTI) and, importantly, significant cryogen cost savings. The magnet system was initially expected to arrive in the fall season of 2007 but its delivery was delayed approximately 6 months for main coil reliability modifications and further testing. Although ACERT installation proceeded normally, with successful ramping to 9T, subsequent reliability issues with the main magnet power supply have delayed final commissioning of the magnet system. However, because the spectrometer itself is presently being rebuilt and upgraded, the magnet power supply repair/replacement downtime should not cause any additional experimental program delay. Several aspects of the spectrometer's design and configuration are affected by the transition to the new 9T magnet, and these are presently being addressed. Mechanically, the bridge, resonator and vacuum insert require an entirely new support structure that is also physically isolated from the magnet containment. To meet this requirement, a rigid framework based on heavy-duty extruded aluminum struts has been designed and will be fabricated and installed in late summer 2008. For field sweep control, a software module will be created and incorporated into the spectrometer control ensemble in order to communicate with the sweep power supply. Logging of critical magnet temperatures and field ramp profile by the spectrometer control system will be optionally implemented at a later date.