ADAPTIVE SILICON MONOCHROMATORS FOR HIGH-POWER WIGGLERS - DESIGN, FINITE-ELEMENT ANALYSIS AND LABORATORY TESTS

Multipole wigglers in storage rings already produce X-ray power in the range up to a few kilowatts and planned devices at third-generation f acilities promise up to 30 kW. Although the power density at the monoc hromator position is an order of magnitude lower than that from undula tors, the thermal strain field in the beam footprint can still cause s evere loss of performance in X-ray optical systems. For an optimized a daptive design, the results of finite-element analysis are compared wi th double-crystal rocking curves obtained with a laboratory X-ray sour ce and, in a second paper [Quintana, Hart, Bilderback, Henderson, Rich ter, Setterson, White, Hausermann, Krumrey and Schulte-Schrepping (199 5). J. Synchotron Rad. 2, 1-5], successful tests at wiggler sources at CHESS and ESRF and in an undulator source at HASYLAB are reported.