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dc.contributor.authorWeiss, Joel Todd
dc.date.accessioned2018-10-03T19:27:13Z
dc.date.available2018-10-03T19:27:13Z
dc.date.issued2017-12-30
dc.identifier.otherWeiss_cornellgrad_0058F_10661
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:10661
dc.identifier.otherbibid: 10474132
dc.identifier.urihttps://hdl.handle.net/1813/59029
dc.description.abstractAdvances in synchrotron radiation light source technology have opened new lines of inquiry in material science, biology, and everything in between. However, x-ray detector capabilities must advance in concert with light source technology to fully realize experimental possibilities. X-ray free electron lasers (XFELs) place particularly large demands on the capabilities of detectors, and developments towards diffraction-limited storage ring sources also necessitate detectors capable of measuring very high flux [1–3]. The detector described herein builds on the Mixed Mode Pixel Array Detector (MM-PAD) framework, developed previously by our group to perform high dynamic range imaging, and the Adaptive Gain Integrating Pixel Detector (AGIPD) developed for the European XFEL by a collaboration between Deustsches Elektronen-Synchrotron (DESY), the Paul-Scherrer-Institute (PSI), the University of Hamburg, and the University of Bonn, led by Heinz Graafsma [4, 5]. The feasibility of combining adaptive gain with charge removal techniques to increase dynamic range in XFEL experiments is assessed by simulating XFEL scatter with a pulsed infrared laser. The strategy is incorporated into pixel prototypes which are evaluated with direct current injection to simulate very high incident x-ray flux. A fully functional 16x16 pixel hybrid integrating x-ray detector featuring several different pixel architectures based on the prototypes was developed. This dissertation describes its operation and characterization. To extend dynamic range, charge is removed from the integration node of the front-end amplifier without interrupting integration. The number of times this process occurs is recorded by a digital counter in the pixel. The parameter limiting full well is thereby shifted from the size of an integration capacitor to the depth of a digital counter. The result is similar to that achieved by counting pixel array detectors, but the integrators presented here are designed to tolerate a sustained flux >10^11 x-rays/pixel/second. In addition, digitization of residual analog signals allows sensitivity for single x-rays or low flux signals. Pixel high flux linearity is evaluated by direct exposure to an unattenuated synchrotron source x-ray beam and flux measurements of more than 10^10 9.52 keV x-rays/pixel/s are made. Detector sensitivity to small signals is evaluated and dominant sources of error are identified. These new pixels boast multiple orders of magnitude improvement in maximum sustained flux over the MM-PAD, which is capable of measuring a sustained flux in excess of 10^8 x-rays/pixel/second while maintaining sensitivity to smaller signals, down to single x-rays.
dc.language.isoen_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectElectrical engineering
dc.subjecthigh dynamic range
dc.subjectPAD
dc.subjectpixel array detector
dc.subjectx-ray detector
dc.subjectPhysics
dc.titleDEVELOPMENT OF A HIGH DYNAMIC RANGE PIXEL ARRAY DETECTOR FOR SYNCHROTRONS AND XFELS
dc.typedissertation or thesis
thesis.degree.disciplinePhysics
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Physics
dc.contributor.chairGruner, Sol Michael
dc.contributor.committeeMemberApsel, Alyssa B.
dc.contributor.committeeMemberElser, Veit
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/X4NZ85V4


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