The RIGI is a four-quadrant beam position monitor suited for hard X-ray synchrotron beamlines. It is ultra-high vacuum (UHV) compatible, can remain continuously in the X-ray beam, and allows monitoring of the X-ray beam position in real time with sub-micron precision. The RIGI is available with two different active areas matching the cross section of most beamlines. It is very simple to install and operate.
The RIGI is based on a very thin CVD diamond membrane and is operated like a solid-state ion chamber. Typically, a bias voltage of 10 kV/cm is applied. The resulting dark current is very low thanks to the high resistivity of diamond.
The absorption of the X-ray beam generates free charge carriers in the diamond layer and as a result, a photocurrent is induced. With an external picoampere meter, this photocurrent can be measured for each pad. The difference of photocurrent between pads over the total current gives the signal, which can be calibrated to provide positional information.
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