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  Performance testing of a large-format reflection grating prototype for a suborbital rocket payload

Donovan, B. D., McEntaffer, R. L., DeRoo, C. T., Tutt, J. H., Grisé, F., Eichfel, C. M., et al. (2020). Performance testing of a large-format reflection grating prototype for a suborbital rocket payload. Journal of Astronomical Instrumentation, 9(4): 2050017. doi:10.1142/S2251171720500178.

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Donovan, Benjamin D., Author
McEntaffer, Randall L., Author
DeRoo, Casey T., Author
Tutt, James H., Author
Grisé, Fabien, Author
Eichfel, Chad M., Author
Gall, Oren Z., Author
Burwitz, Vadim1, Author              
Hartner, Gisela1, Author              
Pelliciari, Carlo1, Author              
La Caria, Marlis-Madeleine1, Author              
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: The soft X-ray grating spectrometer on board the Off-plane Grating Rocket Experiment (OGRE) hopes to achieve the highest resolution soft X-ray spectrum of an astrophysical object when it is launched via suborbital rocket. Paramount to the success of the spectrometer are the performance of the >250 reflection gratings populating its reflection grating assembly. To test current grating fabrication capabilities, a grating prototype for the payload was fabricated via electron-beam lithography at The Pennsylvania State University’s Materials Research Institute and was subsequently tested for performance at Max Planck Institute for Extraterrestrial Physics’ PANTER X-ray Test Facility. Bayesian modeling of the resulting data via Markov chain Monte Carlo (MCMC) sampling indicated that the grating achieved the OGRE single-grating resolution requirement of Rsub>g</sub>(λ∕Δλ)>4500 at the 94% confidence level. The resulting Rsub>g</sub> posterior probability distribution suggests that this confidence level is likely a conservative estimate though, since only a finite Rsub>g</sub> parameter space was sampled and the model could not constrain the upper bound of Rsub>g</sub> to less than infinity. Raytrace simulations of the tested system found that the observed data can be reproduced with a grating performing at Rsub>g</sub>=∞. It is therefore postulated that the behavior of the obtained Rsub>g</sub> posterior probability distribution can be explained by a finite measurement limit of the system and not a finite limit on Rsub>g</sub>. Implications of these results and improvements to the test setup are discussed.

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 Dates: 2020
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1142/S2251171720500178
Other: LOCALID: 3309664
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Title: Journal of Astronomical Instrumentation
Source Genre: Journal
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Pages: - Volume / Issue: 9 (4) Sequence Number: 2050017 Start / End Page: - Identifier: -