DEVELOPMENT AND COMMISSIONING OF MICROBEAM CAPABILITIES ON BL12-2

BL12-2 上微束功能的开发和调试

• 批准号: 8169994
• 负责人: AINA COHEN
• 金额: $ 21.65万
• 依托单位: STANFORD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8169994
• 关键词: Air; Collimator; Computer Retrieval of Information on Scientific Projects Database; Confusion; Copper; Development; Funding; Grant; Heating; Housing; Ice; Image; Institution; Motion; Plastics; Positioning Attribute; Relative (related person); Reproducibility; Research; Research Personnel; Resources; Rotation; Sampling; Source; System; Temperature; Testing; United States National Institutes of Health; base; lens; prototype

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. Microbeam mode for studying microcrystals is being developed and implemented. A precision microdiffractometer was developed in-house and installed. The system is based on a single rotation axis high-precision air bearing and incorporates 3 degrees of motion for sample alignment with 1 micron reproducibility and 1.4 micron sphere of confusion (SOC). The system has been thermally stabilized with a protective copper heat shield incorporated in the body of the diffractometer. The experimental table has been thermally compensated and the hutch temperature is controlled to +/- 0.5 degrees. An in-line camera was incorporated into the beam line for viewing microcrystals along the beam axis, which reduces misalignments due to parallax. The camera can resolve 1 micron features and incorporates 3 degrees of motion for easy alignment and a zoom feature (8x). A pop-in screen has been included which provides backlight for the small samples and a fluorescent screen for identifying the beam position relative to the sample. The camera has been incorporated into the Blu-Ice control system and is compatible with remote access, etc. A prototype automated collimation system was recently tested. The system allows the automatic selection of small beam sizes (smaller than the native focus of 55 um x 20 um). The tiny collimators are held in place on small plastic strips just in front of the in-line camera lens. However these strips do not distort the in-line image to any significant extent. A new system is being fabricated that will allow the selection of 4 beam sizes ranging from 5-20 microns.

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。 用于研究微晶体的微束模式正在被开发和实现。自行研制并安装了一台精密显微衍射仪。该系统以单旋转轴高精度空气轴承为基础，结合了3个运动以实现样品对准，具有1微米的重复性和1.4微米的混球(SOC)。该系统已经通过在衍射仪主体中加入保护性的铜热屏蔽层进行了热稳定。对实验台进行了热补偿，炉膛温度控制在+/-0.5度。在光束线上安装了一个直列式相机，用于沿光束轴观察微晶体，这减少了由于视差造成的失调。该相机可以解决1微米的特征，并结合了3度运动，便于对齐和变焦功能(8倍)。包括一个为小样品提供背光的弹出式屏幕和一个用于识别相对于样品的光束位置的荧光屏。该相机已被集成到蓝冰控制系统中，并与远程访问等兼容。最近测试了自动准直系统的原型。该系统允许自动选择较小的光束尺寸(小于55微米x 20微米的自然聚焦)。微型准直器被固定在小塑料带上，就在直列式相机镜头的前面。但是，这些条带不会对串联图像造成任何明显的扭曲。一种新的系统正在制造中，它将允许选择从5-20微米范围内的4个光束尺寸。