Synchrotron radiation mirror prototype made of monocrystalline tungsten

Synchrotron Radiation (SR) mirrors are ultra precision optical components with very high requirements to shape accuracy and smoothness. According to the special functions mirrors with different shapes are used. The dimensions of such mirrors extend from some tenfold of millimetres to a length of more than one meter. Commonly such mirrors are made of single crystal silicon, Zerodur(R), ULE(R) glass and in rare cases of silicon carbide, special steel or Glidcop(R). Some considerations lead to the result that also tungsten is an interesting alternative material for SR-mirrors. The paper presents the design, some results of the ultra precision machining and some functional parameters of the SR-mirror prototype.