Radiant energy – Radiation controlling means – Shields
Patent
1974-09-09
1976-08-24
Smith, Alfred E.
Radiant energy
Radiation controlling means
Shields
250505, G21K 300
Patent
active
039768902
ABSTRACT:
A mirror structure designed to minimize damage to the mirror caused by soft X-rays. A reflective coating having a high reflectivity at wavelengths of interest is deposited on a glass substrate. The reflective coating has a moderately low atomic number to reduce direct susceptibility to substantial X-ray damage, and further has a high coefficient of thermal conductivity so that it is a good conductor of heat from the reflective coating to the glass substrate. Unfortunately, glass is a poor conductor of heat, and the accumulation of absorbed energy in the reflective coating will rapidly lead to crazing, melting, and vaporization. Accordingly the mirror structure is designed with a heat sink coating between the reflective coating and the glass substrate. The heat sink coating has a higher coefficient of thermal conductivity than glass so that it conducts heat away from the reflective coating, and also has an atomic number which is lower than glass so that it is subject to less X-ray energy absorption. In one disclosed embodiment, the reflective coating is aluminum and the hat sink coating is beryllium.
REFERENCES:
patent: 1542318 (1925-06-01), Pollock
patent: 2179491 (1939-11-01), Cain
patent: 2901631 (1959-08-01), Hansen et al.
patent: 3504963 (1970-04-01), Davies et al.
patent: 3645600 (1972-02-01), Doctoroff et al.
Barnes, Jr. William P.
Wirtenson G. Richard
Anderson B. C.
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
Nathans Robert L.
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