Fig. 1. Schematic diagram of internal heat transfer principal of HPGe detector

Fig. 2. Modeling of the internal geometry structure of HPGe detectors (a) Physical image of HPGe detectors, (b) CAD model diagram, (c) COMSOL modeling diagram

Fig. 3. The grid division and grid dependence of the HPGe detector model(a) Detector grid division, (b) Temperature dependence on grid size

Fig. 4. Diagram of boundary condition of HPGe detector

Fig. 5. Effect of cooling time on the temperature distribution

Fig. 6. Temperature distribution profile of the detector (t=6 h)

Fig. 7. Temperature distribution cloud contour of the HPGe detector

Fig. 8. Influence of cold finger structural material changes on the detector temperature (a) Effect of cold finger supporting material on crystal temperature, (b) Effect of cold finger supporting material on temperature of cold fingertip

Fig. 9. Influence of cold chain material selection on the detector temperature (a) Effect of the cold chain material on crystal temperature, (b) Effect of the cold chain material on temperature of cold fingertip

Fig. 10. Influence of the Dewar sidewall thickness on the detector temperature (at t = 6 h) (a) Effect of the Dewar sidewall thickness on crystal temperature, (b) Effect of the Dewar sidewall thickness on temperature of cold fingertip

Fig. 11. Effect of the distance from the sidewall of the Dewar to the crystal encapsulation cylinder on the detector temperature (at t = 6 h)

Fig. 12. Comparison of the measured and simulated temperature profiles