A CVD-diamond based beam profile monitor for undulator radiation

First results obtained with prototypes of a new type of beam profile monito r based on semi-transparent CVD-diamond are presented. The devices consists of a few micrometer thin membrane on a Si-substrate. Ti/Al-pixel are gener ated lithographically on-the membrane while the signal wires are deposited on a dielectric in order to minimise signal pickup. Synchrotron radiation t ests at 8 keV showed good signal homogeneity, spatial resolution and linear ity for low resistivity diamond membranes. Considerable difficulties were e ncountered in the test of a detector grade diamond membrane. They are most likely related to enhanced surface conductivity and capacitive effects. (C) 2001 Published by Elsevier Science B.V.