The JUNGFRAU Detector for Applications at Synchrotron Light Sources and XFELs

Mozzanica, A.; Andrä, M.; Barten, R.; Bergamaschi, A.; Chiriotti, S.; Brückner, Martin; Dinapoli, R.; Fröjdh, E.; Greiffenberg, D.; Leonarski, Filip; Lopez-Cuenca, C.; Mezza, D.; Redford, S.; Ruder, C.; Schmitt, B.; Shi, X.; Thattil, D.; Tinti, G.; Vetter, S.; Zhang, Jiaguo

doi:10.1080/08940886.2018.1528429

Cited by 52 publications

(46 citation statements)

References 11 publications

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“…GaAs:Cr sensors, bump bonded at the Paul Scherrer Institut (PSI), were characterized with the low noise, charge-integrating readout chip JUNGFRAU1.0 which has been developed by the Photon Science Detector Group of PSI in Switzerland [ 18 , 19 ]. The pixel array consists of 256 × 256 pixels with a pixel size of 75 × 75 µm 2 .…”

Section: Readout Chip and Test Systemmentioning

confidence: 99%

Characterization of Chromium Compensated GaAs Sensors with the Charge-Integrating JUNGFRAU Readout Chip by Means of a Highly Collimated Pencil Beam

Greiffenberg

Andrä

Barten

et al. 2021

Sensors

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Chromium compensated GaAs or GaAs:Cr sensors provided by the Tomsk State University (Russia) were characterized using the low noise, charge integrating readout chip JUNGFRAU with a pixel pitch of 75 × 75 µm2 regarding its application as an X-ray detector at synchrotrons sources or FELs. Sensor properties such as dark current, resistivity, noise performance, spectral resolution capability and charge transport properties were measured and compared with results from a previous batch of GaAs:Cr sensors which were produced from wafers obtained from a different supplier. The properties of the sample from the later batch of sensors from 2017 show a resistivity of 1.69 × 109 Ω/cm, which is 47% higher compared to the previous batch from 2016. Moreover, its noise performance is 14% lower with a value of (101.65 ± 0.04) e- ENC and the resolution of a monochromatic 60 keV photo peak is significantly improved by 38% to a FWHM of 4.3%. Likely, this is due to improvements in charge collection, lower noise, and more homogeneous effective pixel size. In a previous work, a hole lifetime of 1.4 ns for GaAs:Cr sensors was determined for the sensors of the 2016 sensor batch, explaining the so-called “crater effect” which describes the occurrence of negative signals in the pixels around a pixel with a photon hit due to the missing hole contribution to the overall signal causing an incomplete signal induction. In this publication, the “crater effect” is further elaborated by measuring GaAs:Cr sensors using the sensors from 2017. The hole lifetime of these sensors was 2.5 ns. A focused photon beam was used to illuminate well defined positions along the pixels in order to corroborate the findings from the previous work and to further characterize the consequences of the “crater effect” on the detector operation.

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Section: Readout Chip and Test Systemmentioning

confidence: 99%

Characterization of Chromium Compensated GaAs Sensors with the Charge-Integrating JUNGFRAU Readout Chip by Means of a Highly Collimated Pencil Beam

Greiffenberg

Andrä

Barten

et al. 2021

Sensors

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“…Single cylindrical Si(111) crystal with 1 mm segments and 25 cm focal radius dispersed the X-ray fluorescence with Bragg angles around 79 degrees 46,59 . Dispersed photons were registered on a per-shot basis by a 4.5 M JUNGFRAU detector 60,61 (75 × 75 µm 2 pixel size and 4 × 72 cm 2 active area) which allows operation at any Bragg angle in the 40-80 degrees range without any detector motion. JUNGFRAU is a charge integrating pixel hybrid detector designed specifically for XFELs.…”

Section: Methodsmentioning

confidence: 99%

Taking a snapshot of the triplet excited state of an OLED organometallic luminophore using X-rays

et al. 2020

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OLED technology beyond small or expensive devices requires light-emitters, luminophores, based on earth-abundant elements. Understanding and experimental verification of charge transfer in luminophores are needed for this development. An organometallic multicore Cu complex comprising Cu-C and CuP bonds represents an underexplored type of luminophore. To investigate the charge transfer and structural rearrangements in this material, we apply complementary pump-probe X-ray techniques: absorption, emission, and scattering including pump-probe measurements at the X-ray free-electron laser SwissFEL. We find that the excitation leads to charge movement from C-and P-coordinated Cu sites and from the phosphorus atoms to phenyl rings; the Cu core slightly rearranges with 0.05 Å increase of the shortest Cu-Cu distance. The use of a Cu cluster bonded to the ligands through C and P atoms is an efficient way to keep structural rigidity of luminophores. Obtained data can be used to verify computational methods for the development of luminophores.

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“…While the relatively thick sensor (0.5 mm Si), provides good efficiency to photons with high energies of up to 25 keV, the large active area of circa 50 cm 2 allows coverage of a wide region of reciprocal space (i.e., extended q-range). Additionally, two Jungfrau detectors [36], one single module 500k and another 2-module (1 Megapixel), can be mounted on a motorized robot arm above the sample area and utilized for measuring the X-ray emission spectra or Figure 1. The 900 m long X-ray beam path in the photon transport tunnel sections (XTD2 and XTD9) from the SASE1 undulator exit (at the right) to the experimental hall (left end).…”

Section: Fxe Instrumentation and Capabilitiesmentioning

confidence: 99%

“…While the relatively thick sensor (0.5 mm Si), provides good efficiency to photons with high energies of up to 25 keV, the large active area of circa 50 cm 2 allows coverage of a wide region of reciprocal space (i.e., extended q-range). Additionally, two Jungfrau detectors [36], one single module 500k and another 2-module (1 Megapixel), can be mounted on a motorized robot arm above the sample area and utilized for measuring the X-ray emission spectra or X-ray scattering/diffraction from the sample if required. For fully pulse-resolved detection of the emission spectra at MHz pulse repetition rates, the robot can also be equipped with a one-dimensional Gotthard-I strip detector [37] (version II will also soon be available [38]).…”

Section: Fxe Instrumentation and Capabilitiesmentioning

confidence: 99%

Ultrafast X-ray Photochemistry at European XFEL: Capabilities of the Femtosecond X-ray Experiments (FXE) Instrument

et al. 2020

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Time-resolved X-ray methods are widely used for monitoring transient intermediates over the course of photochemical reactions. Ultrafast X-ray absorption and emission spectroscopies as well as elastic X-ray scattering deliver detailed electronic and structural information on chemical dynamics in the solution phase. In this work, we describe the opportunities at the Femtosecond X-ray Experiments (FXE) instrument of European XFEL. Guided by the idea of combining spectroscopic and scattering techniques in one experiment, the FXE instrument has completed the initial commissioning phase for most of its components and performed first successful experiments within the baseline capabilities. This is demonstrated by its currently 115 fs (FWHM) temporal resolution to acquire ultrafast X-ray emission spectra by simultaneously recording iron Kα and Kβ lines, next to wide angle X-ray scattering patterns on a photoexcited aqueous solution of [Fe(bpy)3]2+, a transition metal model compound.

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The JUNGFRAU Detector for Applications at Synchrotron Light Sources and XFELs

Cited by 52 publications

References 11 publications

Characterization of Chromium Compensated GaAs Sensors with the Charge-Integrating JUNGFRAU Readout Chip by Means of a Highly Collimated Pencil Beam

Characterization of Chromium Compensated GaAs Sensors with the Charge-Integrating JUNGFRAU Readout Chip by Means of a Highly Collimated Pencil Beam

Taking a snapshot of the triplet excited state of an OLED organometallic luminophore using X-rays

Ultrafast X-ray Photochemistry at European XFEL: Capabilities of the Femtosecond X-ray Experiments (FXE) Instrument

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