Hamamatsu News 1 / 2020

24 News 2020 Vol.1 The F14844 is an MCP assembly with a unique triode structure* 1 designed to vary the potential gradient and to suppress ion feedback* 2 noise. When operating a con­ ventional MCP, it must be used at vacuum levels higher than 1.3 × 10 -4 Pa. The F14844 operates with high stability even at a low vacuum level of 1 Pa while maintaining a high gain of 1 × 10 6 . This makes the F14844 a useful tool for portable desktop mass spectrometers in which it is difficult to install a large vacuum pumping system. The F14844 is a breakthrough ion detector that allows downsizing and cost reduction of the equipment. Next-generation Ion Detector Ideal for Miniature Portable Mass Spectrometers MCP Assembly F14844 New ELECTRON TUBE PRODUCTS Features „ „ High pressure operation: up to 1 Pa „ „ High gain: 1 × 10 6 or more „ „ Effective area: 14.5 mm dia. „ „ Long life: 3 C/cm 2 or more Applications „ „ Compact mass spectrometer (miniature MS) „ „ Security-related devices (explosive material and drug testing) „ „ Agriculture-related devices (pesticide testing) „ „ Medical devices (infection detection by breath analysis) Specifications Parameter Specification Unit Max. operating pressure 1 Pa Gain (Min.) 1 × 10 6 – Effective area  14.5 mm Resistance 300 to 600 MΩ Dark count (Max.) 3 s -1 •  cm -2 Output waveform (typ.) Dark current (A) 10 -4 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 10 -3 10 -2 10 -1 1 Vacuum level (Pa) F14844 Conventional type MCP gain 10 5 ×10 -7 *1     Structure consisting of three electrodes which are the MCP-out, mesh anode, and dynode. *2     Ion feedback is the cause of unstable operation that occurs under low vacuum conditions.

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