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Instruments / Technical Area	Publication Details	Published
B16-Test Beamline	A stacked prism lens concept for next-generation hard X-ray telescopes Wujun Mi , Peter Nillius , Mark Pearce , Mats Danielsson Nature Astronomy 3, 867 - 872 DOI: 10.1038/s41550-019-0795-y Diamond Proposal Number(s): [16693] Show Abstract ▼ Abstract: Effective collecting area, angular resolution, field of view and energy response are fundamental attributes of X-ray telescopes. The performance of state-of-the-art telescopes is currently restricted by Wolter optics, especially for hard X-rays. Here we report the development of a stacked prism lens (SPL), which is lightweight and modular and has the potential for a significant improvement in effective area, while retaining high angular resolution. The proposed optics are built by stacking disks embedded with prismatic rings, created with photoresist by focused ultraviolet lithography. We demonstrate the SPL approach using a prototype lens that was manufactured and characterized at a synchrotron radiation facility. The design of a potential satellite-borne X-ray telescope is outlined and the performance is compared with contemporary missions.	Jun 2019
B16-Test Beamline I15-Extreme Conditions	Increased count-rate performance and dose efficiency for silicon photon-counting detectors for full-field CT using an ASIC with adjustable shaping time Christel Sundberg , Mats Persson , Andreas Ehliar , Martin Sjölin , Jacob Wikner , Mats Danielsson SPIE Medical Imaging, 2019 DOI: 10.1117/12.2512826 Diamond Proposal Number(s): [17704, 17707] Show Abstract ▼ Abstract: Photon-counting silicon strip detectors are attracting interest for use in next generation CT scanners. For silicon detectors, a low noise floor is necessary to obtain a good dose efficiency. A low noise floor can be achieved by having a filter with a long shaping time in the readout electronics. This also increases the pulse length, resulting in a long deadtime and thereby a degraded count-rate performance. However, as the flux typically varies greatly during a CT scan, a high count-rate capability is not required for all projection lines. It would therefore be desirable to use more than one shaping time within a single scan. To evaluate the potential benefit of using more than one shaping time, it is of interest to characterize the relation between the shaping time, the noise, and the resulting pulse shape. In this work we present noise and pulse shape measurements on a photon-counting detector with two different shaping times along with a complementary simulation model of the readout electronics. We show that increasing the shaping time from 28.1 ns to 39.4 ns decreases the noise and increases the signal-to-noise ratio (SNR) with 6.5% at low count rates and we also present pulse shapes for each shaping time as measured at a synchrotron source. Our results demonstrate that the shaping time plays an important role in optimizing the dose efficiency in a photon-counting x-ray detector.	Mar 2019
B16-Test Beamline	Evaluation of a second-generation ultra-fast energy-resolved ASIC for photon-counting spectral CT Cheng Xu , Mats Persson , Moa Yveborg , Han Cheng , Staffan Karlsson , Mats Danielsson , Christer Svensson , Hans Bornefalk Ieee Transactions On Nuclear Science 60 (1), 437-445 DOI: 10.1109/TNS.2012.2228276 Diamond Proposal Number(s): [5676] Show Abstract ▼ Abstract: A second-generation ultra-fast energy-resolved application specific integrated circuit (ASIC) has been developed for photon-counting spectral computed tomography (CT). The energy resolution, threshold dispersion and gain of the ASIC were characterized with synchrotron radiation at Diamond Light Source. The standard deviation of threshold offsets at zero keV is 0.89 keV. An RMS energy resolution of 1.09 keV has been demonstrated for 15 keV photon energy at a count rate of 40 kcps, and it deteriorates at a rate of 0.29 keV/Mcps with the increase of output cout rate. The count rate performance of the ASIC has also been evaluated with 120 kV polychromatic x-rays produced by a tungsten anode tube and the results are presented.	Feb 2013

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