极化增强，令固态 NMR 的敏感度提高多达 80

    独特的高功率微波源

    易于使用的软件控制高功率回旋管

    微波波导线确保向样品传输zei佳光束

    全新低温 MAS 探头技术，具备内建波导和冷旋压气体供应

    AVANCE III HD 400 和 600 宽口 NMR 系统

Gyrotron Microwave Source

The gyrotron includes a sealed custom-designed gyrotron tube, superconducting magnet, and control system, all designed to provide high stability, reliability, and ease of operation. Beam propagation to the sample is ensured by high microwave beam quality and corrugated waveguide. The sample is polarized in-situ in a low-temperature NMR MAS probe. 

263 GHz Klystron Microwave Source

The 263 GHz klystron is a continuous-wave  microwave source designed and manufactured for extended DNP NMR at 400 MHz 1H frequency and 100 K sample temperature.  The klystron provides a DNP option with lower purchase price, operating costs, footprint, and facility requirements compared to the gyrotron product line while retaining high DNP sensitivity and stability.  At 5 W output power, it reaches 90-100% DNP efficiency on biological samples and small molecules in frozen solution while dense material samples perform at > 80% compared to the 263 GHz gyrotron.

The system assembly consists  of: (1) extended interaction klystron oscillator (EIK), (2) a control system with graphical user interface, safety interlocks, power supply and cooling network, and (3) a low-loss microwave transmission line.  It is compatible with a 400 WB Ascend DNP solid-state NMR spectrometer and Bruker low-temperature MAS (LTMAS) probes. 

控制系统

• 用户界面

• 控制和调节

• 温度、电压、水冷却、回旋管磁体

低温 MAS 探头

• 低样品温度 (~ 100 K)

• 冷样品线圈和 RF 电路

• 3.2 毫米 MAS 转子（在 100 K 下zei大转速为 17 kHz）

• 宽腔三线共振探头 (H/C/N)

• 冷样品弹入／弹出

• 低温干氮气供应

• 3 路气体：样品支承、旋转驱动和 变温

• 自动加注液态氮供应

• 微波辐射传导

• 长期操作（数天、数周）