CONSTRUCTION OF NEW 170 & 250GHZ CW- ESR SPECTROMETER

新 170 的建设

• 批准号: 8363945
• 负责人: KEITH A EARLE
• 金额: $ 0.14万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8363945
• 关键词: Affect; Area; Biological; Circular Dichroism; Development; Frequencies; Funding; Grant; Mechanics; Modification; National Center for Research Resources; Noise; Performance; Phase; Platelet Factor 4; Principal Investigator; Research; Research Infrastructure; Resources; Rotation; Sampling; Services; Signal Transduction; Source; System; Technology; Testing; United States National Institutes of Health; Work; aqueous; base; cost; cryogenics; flexibility; improved; millimeter

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. We have built our new HFHF-ESR cw spectrometer with improved, low-loss, broadband quasioptical components and incorporated it into the new 9T magnet purchased from Magnex. The observed improvements in signal to noise accruing from these upgrades, due in large part to the reduced insertion loss of the quasioptical bridge and higher mechanical stability of the new setup, are crucially important for the wide variety of biological samples in aqueous media that we study. The flexibility of the newly configured bridge is also important for the development work on circular dichroism ESR (CD-ESR) that we are undertaking. The upgrades that we are implementing will also improve the performance of our goniometer for single crystal rotation studies, because of the reduced cross-sectional area of the quasioptics in the wam bore of the new magnet. The increased accessible bore cross-sectional area allows a more robust mechanical control mechanism as well as a more efficient cryogenic control system which we have recently tested. The major improvement to the bridge implemented this year has been the installation of more powerful and reliable millimeter wave sources based on advances in the state-of-the-art for high-frequency multipliers. We have been able to increase the available power at 170GHz by a factor of 4 compared to our old source. At 240GHz we have achieved an improvement by an order of magnitude in the available power compared to our old source. In addition, the power level is conveniently controllable by the operator, as is the frequency. Furthermore, modifications to the source for implementation of CD-ESR or other advanced concepts will be much easier to affect as there is no phase-locked loop at the millimeter wave frequency. Such a phase-lock loop was an integral part of our old sources which made modification and servicing very difficult.

该副本是利用资源的众多研究子项目之一 由NIH/NCRR资助的中心赠款提供。对该子弹的主要支持 而且，副投影的主要研究员可能是其他来源提供的 包括其他NIH来源。 列出的总费用可能 代表subproject使用的中心基础架构的估计量， NCRR赠款不直接向子弹或副本人员提供的直接资金。 我们已经建立了新的HFHF-ESR CW光谱仪，并使用了改进的，低损失的，宽带的准电流组件，并将其掺入了从Magnex购买的新9T磁铁中。 观察到的这些升级的信号的改善，这在很大程度上是由于准桥的插入损失减少，而新设置的机械稳定性较高，对于我们研究的水性培养基中种类繁多的生物样品至关重要。 新配置的桥梁的灵活性对于我们正在进行的圆形二色性ESR（CD-ESR）的开发工作也很重要。 我们正在实施的升级也将提高单晶旋转研究的性能计的性能，因为新磁铁WAM孔中准植物的横截面区域减少。 增加的孔横截面区域增加了我们最近测试的更有效的机械控制机制以及更有效的低温控制系统。 今年实施的桥梁的重大改进是基于高频乘数的最先进的进步安装了更强大，更可靠的毫米波源。 与我们的旧来源相比，我们已经能够将170GHz的可用功率提高4倍。 与我们的旧资源相比，在240GHz时，我们在可用的功率方面取得了进步。 此外，功率水平和频率都可以方便地控制。 此外，由于在毫米波频率下没有相锁的环，因此对CD-ESR或其他高级概念的实现来源进行修改将更容易影响。 这种相锁环是我们旧来源不可或缺的一部分，它使修改和维修非常困难。