Engineering topics

Caswell, T.

Publications and source records attributed to Caswell, T..

3 records

DOE OSTI2018

Multi-Element Germanium Detectors with Integrated Readouts

In this study, we have developed a series of monolithic multi-element germanium detectors coupled with custom developed CMOS application specific integrated circuit (ASIC) for readout. Several strip detectors with element counts ranging from 64 to 384 were developed and are currently used at the National Synchrotron Light Source II in Brookhaven National Laboratory and the Advanced Photon Source in Argonne National Laboratory. Lastly, the detectors are photon counting and are used at high-energy diffraction and energy dispersive diffraction beamlines.

47 OTHER INSTRUMENTATION↗

DOE OSTI2018

Spectrum-Based Alignment of In-Vacuum Undulators in a Low-Emittance Storage Ring

In-vacuum undulators (IVU) are used extensively at light source facilities, in particular at medium-energy storage rings, where these devices are the main sources of high-brightness hard X-rays. The relatively small vertical magnetic gaps that are used in these planar undulators make them rather sensitive to misalignments of magnet arrays with respect to the electron orbit in the vertical plane. Based on commissioning results of undulator-based hard X-ray beamlines at the National Synchrotron Light Source II (NSLS-II)—a Department of Energy Office of Science User Facility at Brookhaven National Laboratory— IVU misalignment was found to be the most frequent cause of spectral “underperformance.” It is possible, nevertheless, to restore the performance using a spectrum-based IVU alignment procedure described in this article.

47 OTHER INSTRUMENTATION↗

DOE OSTI2018

Multi-element germanium detectors for synchrotron applications

In this paper, we have developed a series of monolithic multi-element germanium detectors, based on sensor arrays produced by the Forschungzentrum Julich, and on Application-specific integrated circuits (ASICs) developed at Brookhaven. Devices have been made with element counts ranging from 64 to 384. These detectors are being used at NSLS-II and APS for a range of diffraction experiments, both monochromatic and energy-dispersive. Compact and powerful readout systems have been developed, based on the new generation of FPGA system-on-chip devices, which provide closely coupled multi-core processors embedded in large gate arrays. Finally, we will discuss the technical details of the systems, and present some of the results from them.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗