Beamstop with Integrated X-ray Diode Sensor
The MC group developed a versatile beamstop with an integrated PIN diode sensor using non-specialized components (Fig. 1). The miniature PIN diode is molded into a tungsten epoxy composite cup with a total diameter of 1.5 mm. The cup is supported on a thin fiberglass arm with printed circuit traces to transmit the diode signal. The assembly has an active area of approximately 100 μm in diameter. As the diode is encapsulated in plastic, the response diminishes with decreasing energy but is still useful at 6 keV.
Figure 1. Integrated Diode Beamstop. Click-on to enlarge.
Fabrication and assembly instructions are described in the Reference Publication.
Supplemental photos for molding the tungsten cup are shown below:
Figure 2. Overview of the mold. Click-on to enlarge.
Figure 3. Close-up of the mold and plunger. Click-on to enlarge.
Figure 4. Close-up of the beamstop inside the mold.
Figure 5. Beamstop removed from mold - before trimming excess epoxy. Click-on to enlarge.