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Report on recent results of the PERCIVAL soft X-ray imager

Khromova, A. and Cautero, G. and Giuressi, D. and Menk, R. and Pinaroli, G. and Stebel, L. and Correa, J. and Marras, A. and Wunderer, C. B. and Lange, S. and Tennert, M. and Niemann, M. and Hirsemann, H. and Smoljanin, S. and Reza, S. and Graafsma, H. and Göttlicher, P. and Shevyakov, I. and Supra, J. and Xia, Q. and Zimmer, M. and Guerrini, N. and Marsh, B. and Sedgwick, I. and Nicholls, T. and Turchetta, R. and Pedersen, U. and Tartoni, N. and Hyun, H. J. and Kim, K. S. and Rah, S. Y. and Hoenk, M. E. and Jewell, A. D. and Jones, T. J. and Nikzad, S. (2016) Report on recent results of the PERCIVAL soft X-ray imager. Journal of Instrumentation, 11 (11). Art. No. C11020. ISSN 1748-0221.

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The PERCIVAL (Pixelated Energy Resolving CMOS Imager, Versatile And Large) soft X-ray 2D imaging detector is based on stitched, wafer-scale sensors possessing a thick epi-layer, which together with back-thinning and back-side illumination yields elevated quantum efficiency in the photon energy range of 125–1000 eV. Main application fields of PERCIVAL are foreseen in photon science with FELs and synchrotron radiation. This requires high dynamic range up to 105 ph @ 250 eV paired with single photon sensitivity with high confidence at moderate frame rates in the range of 10–120 Hz. These figures imply the availability of dynamic gain switching on a pixel-by-pixel basis and a highly parallel, low noise analog and digital readout, which has been realized in the PERCIVAL sensor layout. Different aspects of the detector performance have been assessed using prototype sensors with different pixel and ADC types. This work will report on the recent test results performed on the newest chip prototypes with the improved pixel and ADC architecture. For the target frame rates in the 10–120 Hz range an average noise floor of 14e− has been determined, indicating the ability of detecting single photons with energies above 250 eV. Owing to the successfully implemented adaptive 3-stage multiple-gain switching, the integrated charge level exceeds 4 10^6 e− or 57000 X-ray photons at 250 eV per frame at 120 Hz. For all gains the noise level remains below the Poisson limit also in high-flux conditions. Additionally, a short overview over the updates on an oncoming 2 Mpixel (P2M) detector system (expected at the end of 2016) will be reported.

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Jewell, A. D.0000-0001-8834-3769
Additional Information:© 2016 IOP Publishing Ltd and Sissa Medialab srl. Received 28 September 2016; Accepted 7 November 2016; Published 17 November 2016.
Issue or Number:11
Record Number:CaltechAUTHORS:20161117-101849586
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Official Citation:A. Khromova et al 2016 JINST 11 C11020
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72116
Deposited By: Tony Diaz
Deposited On:17 Nov 2016 19:43
Last Modified:09 Mar 2020 13:18

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