Position‐sensitive radiation detectors made of single crystal CVD diamond

Abstract

Based on a single crystal chemical vapour deposition (scCVD) diamond plate a position sensitive detector [position sensitive detection (PSD)] has been fabricated. The ∼9 mm 2 sensing area of the detector consists of a diamond-like carbon (DLC) thin film, in the form of a plane-pad resistive electrode layer deposited on the scCVD surface. The 1D position information is obtained from the resistive charge division between two collecting electrodes located at the extremities of the DLC sensing electrode. The detector properties have been tested using a 241 Am α-particles source. The timing characteristics of the device were probed using broad-band (BB) electronics: the signal formation does not exceed 30 ns, thus detector operation with a negligible ballistic effect is possible at high rates approaching 10 7 particles/s. The linearity and position resolution of the device was measured using low-noise chargesensitive (CS) electronics: the position resolution reaches 30 m (σ), the deviation from linearity remain below 2% in the full range of the detector sensing area.

Pulse-resolved intensity measurements at a hard X-ray FEL using semi-transparent diamond detectors

“…The resistance of the graphite electrodes is around 100 square À1 which is large enough to apply two electrodes per side and detect the position of the X-ray pulse via the difference between the measured currents. This scheme can be improved to perform perpendicular measurements of both transverse positions (two-dimensional) while still allowing a bias voltage to be applied (Pomorski et al, 2009). The application of the bias voltage and signal readout to the surface of the graphite electrode was made by simple clamping using copper-beryllium springs.…”

“…Single-crystalline chemical vapor deposited (scCVD) diamond detectors have been used previously at synchrotron sources, either as intensity monitors De Sio et al, 2007;Keister & Smedley, 2009) or as quadrant beam position monitors (BPMs) (Morse et al, , 2010Bohon et al, 2010;Keister et al, 2011;Desjardins et al, 2014). In addition, homogeneous BPMs using electrodes on each crystal edge (Pomorski et al, 2009) are available. The rapid speed of diamond detectors was already exploited to detect intensity and position at the bunch frequency of a synchrotron X-ray source (Morse et al, 2010;Antonelli et al, 2013).…”

Fast beam monitor diamond-based devices for VUV and X-ray synchrotron radiation applications

“…Therefore, the issue of electron beam stabilization has been extensively addressed in the past years through the development of a fast orbit feedback (FOFB) based on electron beamposition monitors (eBPMs) (Galimberti et al, 2001). Photon beam-position monitors (pBPMs) provide such control systems with additional important information: photon beam position and absolute intensity (Bergonzo et al, 2000;Menk et al, 2007;Pomorski et al, 2009;Feng et al, 2011;Di Fraia et al, 2013;Antonelli et al, 2014); and integration of pBPM information into the FOFB was recently proposed (Fischetti et al, 2002;Morse et al, 2010;Antonelli et al, 2014;Cheng et al, 2018;Sereno et al, 2018).…”

X-ray position-sensitive duo-lateral diamond detectors at SOLEIL

“…Many different kinds of in-beam transparent position monitors have been used in the past: microwire devices (Heald, 1986), gaseous detectors (Schildkamp & Pradervand, 1995), indirect fluorescent or scattered X-ray detection from thin foils with PIN-diodes (Alkire et al, 2000) or pixelated detectors (Rico-Alvarez et al, 2014), as well as thin solid-state devices developed on silicon (Fuchs et al, 2007) or polycrystalline diamond (Bergonzo et al, 1999). In this paper, a new type of diamond X-ray beam position monitor (XBPM) is presented: the device is based on an electronic-grade singlecrystal chemical-vapour-deposition (CVD) diamond material (Morse et al, 2010) processed on a duo-lateral positionsensitive detector (PSD) with diamond-like carbon (DLC) resistive coating (Pomorski et al, 2009). In addition to the excellent physical properties of diamond (radiation hardness, low X-ray absorption, mechanical resistance, large band gap, fast speed charge propagation, etc.…”