eROSITA camera array on the SRG satellite

Meidinger, Norbert; Andritschke, Robert; Dennerl, K.; Emberger, Valentin; Eraerds, Tanja; Hälker, Olaf; Hartner, Gisela; Pietschner, Daniel; Reiffers, Jonas

doi:10.1117/1.jatis.7.2.025004

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…These measurements represent high QE, comparable to state-of-the-art back-illuminated x-ray CCDs, such as those used in Chandra ACIS, 20 XMM-Newton EPIC, 21,22 or eROSITA. 23,24 Our H2RG absorber layer was fabricated with a design targeted for optical detectors and was designed with a thicker-than-necessary oxide layer (acting as an optical antireflection coating). Other x-ray HCDs with thinner oxide layers should theoretically be capable of even higher lowenergy QE than that measured on our H2RG.…”

Section: Qe Resultsmentioning

confidence: 99%

Measuring the soft x-ray quantum efficiency of a hybrid CMOS detector

Colosimo

Falcone

Wages

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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Next-generation x-ray observatories, such as the Lynx X-ray Observatory Mission Concept or other similar concepts in the coming decade, will require detectors with high quantum efficiency (QE) across the soft x-ray band to observe the faint objects that drive their mission science objectives. Hybrid CMOS detectors (HCDs), a form of active-pixel sensor, are promising candidates for use on these missions because of their fast read-out, low power consumption, and intrinsic radiation hardness. We present QE measurements of a Teledyne H2RG HCD, performed using a gas-flow proportional counter as a reference detector. We find that this detector achieves high QE across the soft x-ray band, with an effective QE of 94.6 AE 1.1% at the Mn Kα∕Kβ energies (5.90/6.49 keV), 98.3 AE 1.9% at the Al Kα energy (1.49 keV), 85.6 AE 2.8% at the O Kα energy (0.52 keV), and 61.3 AE 1.1% at the C Kα energy (0.28 keV). These values are in good agreement with our model, based on the absorption of detector layers. We find similar results in a more restrictive analysis considering only high-quality events, with only somewhat reduced QE at lower energies.

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Section: Qe Resultsmentioning

confidence: 99%

Measuring the soft x-ray quantum efficiency of a hybrid CMOS detector

Colosimo

Falcone

Wages

et al. 2022

J. Astron. Telesc. Instrum. Syst.

View full text Add to dashboard Cite

show abstract

“…These measurements represent high QE, comparable to state-of-the-art back-illuminated X-ray CCDs, such as those used in Chandra ACIS, 20 XMM-Newton EPIC, 21,22 or eROSITA. 23,24 Our H2RG absorber layer was fabricated with a design targeted for optical detectors and was designed with a thicker-than-necessary oxide layer (acting as an optical anti-reflection coating). Other Xray HCDs with thinner oxide layers should theoretically be capable of even higher low-energy QE than that measured on our H2RG.…”

Section: Qe Resultsmentioning

confidence: 99%

Measuring the Soft X-Ray Quantum Efficiency of a Hybrid CMOS Detector

Colosimo,

Falcone,

Wages

et al. 2022

Preprint

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Next-generation X-ray observatories, such as the Lynx X-ray Observatory Mission Concept or other similar concepts in the coming decade, will require detectors with high quantum efficiency (QE) across the soft Xray band to observe the faint objects that drive their mission science objectives. Hybrid CMOS Detectors (HCDs), a form of active-pixel sensor, are promising candidates for use on these missions because of their fast read-out, low power consumption, and intrinsic radiation hardness. In this work, we present QE measurements of a Teledyne H2RG HCD, performed using a gas-flow proportional counter as a reference detector. We find that this detector achieves high QE across the soft X-ray band, with an effective QE of 94.6 ± 1.1% at the Mn Kα/Kβ energies (5.90/6.49 keV), 98.3 ± 1.9% at the Al Kα energy (1.49 keV), 85.6 ± 2.8% at the O Kα energy (0.52 keV), and 61.3 ± 1.1% at the C Kα energy (0.28 keV). These values are in good agreement with our model, based on the absorption of detector layers. We find similar results in a more restrictive analysis considering only high-quality events, with only somewhat reduced QE at lower energies.

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“…In the past several decades, CCD detectors have been dominant in X-ray applications. Most modern X-ray astronomy missions, such as Chandra (Garmire et al 2003), XMM-Newton (Strüder et al 2001), Suzaku (Koyama et al 2007) and eROSITA (Meidinger et al 2021), have chosen CCD sensors as their focal plane detectors. Recently, the performance of scientific CMOS (sCMOS) detectors has been improved considerably.…”

Section: Introductionmentioning

confidence: 99%

“…The energy resolution of Silicon Drift Detectors (SDDs) can reach 122 eV at 5.9 keV at −60 • C 1 . And modern CCDs can reach 130 eV at 6.4 keV under deep refrigeration of below −70 • C (Meidinger et al 2021). But for CMOS sensors, the typical energy resolution is worse than that of CCDs (Wang et al 2019;Narukage et al 2020;Wu et al 2022;Hsiao et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Improving the X-ray energy resolution of a scientific CMOS detector by pixel-level gain correction

Wu¹,

Ling²,

Wang³

et al. 2023

Preprint

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Scientific Complementary Metal Oxide Semiconductor (sCMOS) sensors are finding increasingly more applications in astronomical observations, thanks to their advantages over charge-coupled devices (CCDs) such as a higher readout frame rate, higher radiation tolerance, and higher working temperature. In this work, we investigate the performance at the individual pixel level of a large-format sCMOS sensor, GSENSE-1516BSI, which has 4096 × 4096 pixels, each of 15 µm in size. To achieve this, three areas on the sCMOS sensor, each consisting of 99 × 99 pixels, are chosen for the experiment. The readout noise, conversion gain and energy resolutions of the individual pixels in these areas are measured from a large number (more than 25,000) of X-ray events accumulated for each of the pixels through long time exposures. The energy resolution of these pixels can reach 140 eV at 6.4 keV at room temperature and shows a significant positive correlation with the readout noise. The accurate gain can also be derived individually for each of the pixels from its X-ray spectrum obtained. Variations of the gain values are found at a level of 0.56% statistically among the 30 thousand pixels in the areas studied. With the gain of each pixel determined accurately, a precise gain correction is performed pixel by pixel in these areas, in contrast to the standardized ensemble gain used in the conventional method. In this way, we could almost completely eliminate the degradation of energy resolutions caused by gain variations among pixels. As a result, the energy resolution at room temperature can be signifi-

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eROSITA camera array on the SRG satellite

Cited by 13 publications

References 13 publications

Measuring the soft x-ray quantum efficiency of a hybrid CMOS detector

Measuring the soft x-ray quantum efficiency of a hybrid CMOS detector

Measuring the Soft X-Ray Quantum Efficiency of a Hybrid CMOS Detector

Improving the X-ray energy resolution of a scientific CMOS detector by pixel-level gain correction

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