Analysis of the load effect of the light-blocking element

CAE's achievements in the design of the light blocker. A typical light blocking element-the structure of the photon light blocker, adopts a water-cooled overall structure, and supports partial lifting or complete blocking of light by supporting the lifting mechanism. Under normal circumstances, part of the light beam passes through. At this time, part of the synchrotron radiation passes through the through hole of the vacuum cavity, and the other part is blocked by the absorber of the light barrier; the beam line is completely blocked when not working or in an unexpected situation. The synchrotron radiation irradiates all the absorbers. In the structure of the vacuum chamber, the internal light blocking section is an absorber with an inclined surface, which is used to absorb the synchrotron radiation.

The design of the light blocking element under the action of high thermal load mainly considers the thermal stress caused by high power density synchrotron radiation, that is, the thermal stress level of the absorber is a key factor in the design of the entire light blocking element. Around this factor, the specific content of the design of the light-blocking element mainly includes the material selection of the absorber, the structural form, and the arrangement of the cooling pipes. The choice of materials is often the first consideration for designers, because the final design criteria are closely related to the basic mechanical properties such as the strength and rigidity of the material.

Most of the light-absorbing element absorber materials of the first and second generation synchrotron radiation devices use high thermal conductivity oxygen-free copper. However, the strength of OFHCCu is significantly reduced at high temperatures, and it is difficult for the energy to be several orders of magnitude higher than that of the first and second generation light sources. It is widely used in the third generation light source. The study found that Al2O3 dispersion-reinforced copper material has the advantages of high strength and high thermal conductivity, and is more resistant to fatigue and high temperature softening. It is an ideal material for the third-generation synchrotron radiation barrier.

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