TOF detector with a built-in voltage divider

TOF detector with a built-in voltage divider, mounted on a printed circuit board, is designed for detection of charged particle fluxes as part of a mass spectrometer

Detectors for time-of-flight mass spectrometers must have a high-speed response without “damped” oscillations (TOF detectors) and must detect ions with high efficiency. Therefore, MCP detectors, which have high ion sensitivity, sub-nanosecond response time and are compact, are mainly used as such detectors.

The board used to assemble the MCP detector contains the detector voltage divider, power supply circuit components, and a coaxial connector for signal acquisition. Assembly of the detector with the board allows to reduce the influence of spurious inductances and capacitances, as a result the output pulse of the MCP-detector acquires a classical waveform without “damped” oscillations and has a short width (less than 1 ns). The compact design, with 2 inputs for voltage supply and a coaxial connector for signal acquisition, is more adaptable to the application and allows easy installation and replacement of the detector when needed.


Basic parameters
Parameter, unit Value
min max
MCP active area diameter, mm 26  
Supply voltage at 1×107 gain, V     2400
Single electron pulse height resolution, %   130
Dark count rate density, count/sec×cm2   2
Average pulse width (FWHM), ns   0.85
Pulse leading edge rise time, ns   0.5
Product consumption current at supply voltage, μA       250
Typical output waveform
The detector electrical connection diagram

R1 = 10 MΩ;
R2 = R3 = 1 MΩ;
С1 = С2 = 470 pF;
Usupply = -2.4 kV, max

1 – control electrode;
2 – MCP unit;
3 – anode

General view, overall, setting and mounting dimensions of MCP detector with 25 mm active area diameter
Lead designation
1Supply voltage –2400 V, max
2. 3Package
SMASignal output