An X-ray pinhole camera with a range of defined apertures

Journal article

Operation of 3 generation synchrotron light sources is heading towards low emittance coupling offering small vertical beam size and extending the transverse coherence of the X-ray photon beam. In the case of Diamond, exploring operation at 0.1% coupling will imply measuring vertical beam sizes of the order of 7/m (in bending magnets). Measurement of the vertical beam size and coupling with the best accuracy requires a precise knowledge of the Point Spread Function (PSF) of the electron beam imaging system. At Diamond two X-ray pinhole cameras are used for this measurement. In this paper we present our first results of beam size measurement using a deconvolution technique, based on the Lucy-Richardson iterative algorithm which uses the PSF of the imaging system. We verify the validity of the method with measurements of the electron beam size with a series of pinholes of well defined apertures varying from 12 to 100/m laser machined into a 200/m Tungsten plate. In this paper we discuss the experimental results and the accuracy of the method.

Authors: Thomas, C; Rehm, G; Bartolini, R

• Journal: 2012 Beam Instrumentation Workshop, BIW 2012
• Pages: 116-118
• Publication date: 2006-01-01
• Language: English