Design and implementation of Dilation X-ray Imager for NIF "DIXI"

M J. Ayers; S. R. Nagel; B. Felker; P. M. Bell; D. K. Bradley; K. Piston; J. Parker; Z. Lamb; J. D. Kilkenny; T. J. Hilsabeck; T. Chung; J. D. Hares; A. K. L. Dymoke-Bradshaw

doi:10.1117/12.2026803

26 September 2013 Design and implementation of Dilation X-ray Imager for NIF "DIXI"

M J. Ayers, S. R. Nagel, B. Felker, P. M. Bell, D. K. Bradley, K. Piston, J. Parker, Z. Lamb, J. D. Kilkenny, T. J. Hilsabeck, T. Chung, J. D. Hares, A. K. L. Dymoke-Bradshaw

Author Affiliations +

Proceedings Volume 8850, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion II; 88500C (2013) https://doi.org/10.1117/12.2026803
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

Gated X-Ray imagers have been used on many ICF experiments around the world for time resolved imaging of the target implosions. DIXI (Dilation X-ray Imager) is a new fixed base diagnostic that has been developed for use in the National Ignition Facility. The DIXI diagnostic utilizes pulse-dilation technology [1,2,3,4] and uses a high magnification pinhole imaging system to project images onto the instrument. DIXI is located outside the NIF target chamber approximately 6.5m from target chamber center (TCC). The pinholes are located 10cm from TCC and are aligned to the DIXI optical axis using a diagnostic instrument manipulator (DIM) on an adjacent port. By use of an extensive lead and poly shielded drawer enclosure DIXI is capable of collecting data at DT neutron yields up to Yn~ 10¹⁶ on CCD readout and up to Yn~ 10¹⁷ on film. Compared to existing pinhole x-ray framing cameras DIXI also provides a significant improvement in temporal resolution, <10ps, and the ability to capture a higher density of images due to the fact the pinhole array does not require collimators. The successful deployment of DIXI on the NIF required careful attention to the following subsystems, pinhole imaging, debris shielding, filtering and image plate (FIP), EMI protection, large format CsI photocathode design, detector head, detector head electronics, control electronics, CCD, film recording and neutron shielding. Here we discuss the initial design, improvements implemented after rigorous testing, infrastructure and commissioning of DIXI on the NIF.

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M J. Ayers, S. R. Nagel, B. Felker, P. M. Bell, D. K. Bradley, K. Piston, J. Parker, Z. Lamb, J. D. Kilkenny, T. J. Hilsabeck, T. Chung, J. D. Hares, and A. K. L. Dymoke-Bradshaw "Design and implementation of Dilation X-ray Imager for NIF "DIXI"", Proc. SPIE 8850, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion II, 88500C (26 September 2013); https://doi.org/10.1117/12.2026803

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