Dr. Ali Kashani Profile

Dr. Ali Kashani

at NASA Ames Research Ctr

SPIE Involvement:

Author

Publications (7)

SPIE Journal Paper | 11 March 2021 Open Access

Mid-infrared spectrometer and camera for the Origins Space Telescope

Itsuki Sakon, Thomas Roellig, Kimberly Ennico-Smith, Taro Matsuo, Yuji Ikeda, Tomoyasu Yamamuro, Keigo Enya, Takehiko Wada, Mitsunobu Kawada, Aoi Takahashi, Yuki Sarugaku, Naofumi Fujishiro, Naoshi Murakami, Jun Nishikawa, Takayuki Kotani, Shohei Goda, Masayuki Ido, Satoshi Itoh, Takahiro Tsuboi, Takahiro Sumi, Masatsugu Kamiura, Takeo Manome, Naoto Iida, Kentaro Yanagibashi, Thomas Greene, Bernardus Helvensteijn, Lynn Hofland, Roy Johnson, Ali Kashani, Emmett Quigley, Robert McMurray, Hanae Inami, Denis Burgarella, the Origins Space Telescope mission concept study team

JATIS, Vol. 7, Issue 01, 011013, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.011013

KEYWORDS: Sensors, Spectroscopy, Mirrors, Cameras, Mid-IR, Space telescopes, Electronics, Telescopes, Detector arrays, Mercury cadmium telluride

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The mid-infrared spectrometer and camera transit spectrometer (MISC-T) is one of the three baseline instruments for Origins Space Telescope (Origins) and provides the capability to assess the habitability of nearby exoplanets and search for signs of life. MISC-T employs a densified pupil optical design, and HgCdTe and Si:As detector arrays. This optical design allows the instrument to be relatively insensitive to minor line-of-sight pointing drifts and telescope aberrations, and the detectors do not require a sub-Kelvin refrigerator. MISC-T has three science spectral channels that share the same field-of-view by means of beam splitters, and all channels are operated simultaneously to cover the full spectral range from 2.8 to 20 μm at once with exquisite stability and precision (<5 ppm between 2.8 to 11 μm, <20 ppm between 11 and 20 μm). A Lyot-coronagraph-based tip–tilt sensor located in the instrument fore-optics uses the light reflected by a field stop, which corresponds to 0.3% of the light from the target, to send fine pointing information to the field steering mirror in the Origins telescope. An additional MISC Wide Field Imager (WFI) is studied as an upscope option for the Origins. MISC-WFI offers a wide field imaging (3 ′ × 3 ′ ) and low-resolution spectroscopic capability with filters and grating-prisms (grisms) covering 5 to 28 μm. The imaging capability of the MISC-WFI will be used for general science objectives. The low-resolution spectroscopic capability in MISC-WFI with a resolving power R ( = λ / Δλ) of a few hundreds will be used to measure the mid-infrared dust features and ionic lines at z up to ∼1 in the Origins mission’s Rise of Metals and Black Hole Feedback programs. The MISC-WFI also serves as a focal plane pointing and guiding instrument for the observatory, including when the MISC-T channel is performing its exoplanet spectroscopy observations.

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Proceedings Article | 13 December 2020 Poster + Paper

Laboratory experiment of densified pupil spectrograph for the Origins Space Telescope

T. Matsuo, T. Greene, R. Johnson, R. McMurray, T. Roellig, K. Ennico-Smith, B. Helvensteijn, A. Kashani, H. Shibai, T. Sumi, S. Itoh, I. Sakon, T. Yamamuro, Y. Ikeda, T. Manome, N. Iida, K. Yanagibashi, M. Kamiura

Proceedings Volume 11443, 114436D (2020) https://doi.org/10.1117/12.2560421

KEYWORDS: Spectrographs, Space telescopes, Prototyping, Cryogenics, Telescopes, Device simulation, Signal detection, Sensors, Optical aberrations, Mid-IR

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Proceedings Article | 1 August 2018 Paper

A highly stable spectrophotometric capability for the Origins Space Telescope (OST) mid-infrared imager, spectrometer, coronagraph (MISC)

Taro Matsuo, Tom Greene, Thomas Roellig, Robert McMurray, Roy Johnson, Ali Kashani, Shohei Goda, Masayuki Ido, Satoshi Ito, Takahiro Tsuboi, Tomoyasu Yamamuro, Yuji Ikeda, Hiroshi Shibai, Takahiro Sumi, Itsuki Sakon, Kimberly Ennico-Smith

Proceedings Volume 10698, 1069844 (2018) https://doi.org/10.1117/12.2311896

KEYWORDS: Spectrographs, Sensors, Spectroscopy, Telescopes, Stars, Space telescopes, Mid-IR, Planets, Mirrors, Imaging systems

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Proceedings Article | 30 July 2010 Paper

Cooling system for the soft x-ray spectrometer (SXS) onboard ASTRO-H

Ryuichi Fujimoto, Kazuhisa Mitsuda, Noriko Yamasaki, Yoh Takei, Masahiro Tsujimoto, Hiroyuki Sugita, Yoichi Sato, Keisuke Shinozaki, Atsushi Okamoto, Takaya Ohashi, Yoshitaka Ishisaki, Yuichiro Ezoe, Kumi Ishikawa, Masahide Murakami, Shunji Kitamoto, Hiroshi Murakami, Toru Tamagawa, Madoka Kawaharada, Hiroya Yamaguchi, Kosuke Sato, Akio Hoshino, Kenichi Kanao, Seiji Yoshida, Mikio Miyaoka, Michael DiPirro, Peter Shirron, Gary Sneiderman, Richard Kelley, F. Scott Porter, Caroline Kilbourne, John Crow, Andrea Mattern, Ali Kashani, Dan McCammon

Proceedings Volume 7732, 77323H (2010) https://doi.org/10.1117/12.856909

KEYWORDS: Cryocoolers, Cooling systems, X-rays, Spectroscopy, Liquids, X-ray astronomy, Sensors, Space operations, Detector arrays, Failure analysis

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Proceedings Article | 29 July 2010 Paper

The x-ray microcalorimeter spectrometer onboard of IXO

J. W. den Herder, R. Kelley, K. Mitsuda, L. Piro, S. Bandler, P. Bastia, K. Boyce, M. Bruin, J. Chervenak, L. Colasanti, W. B. Doriese, M. DiPirro, M. Eckart, Y. Ezoe, E. Figueroa-Feliciano, L. Ferrari, R. Fujimoto, F. Gatti, K. Gendreau, L. Gottardi, R. den Hartog, G. Hilton, H. Hoevers, K. Irwin, Y. Ishisaki, A. Kashani, C. Kilbourne, P. de Korte, J. van der Kuur, C. Macculi, T. Mineo, J. H. Nieland, T. Ohashi, S. Paltani, E. Perinati, F. Porter, P. Shirron, S. Smith, Y. Takei, M. Tashiro, G. Torrioli, M. Tsujimoto, H. van Weers, N. Yamasaki

Proceedings Volume 7732, 77321H (2010) https://doi.org/10.1117/12.856018

KEYWORDS: Sensors, X-rays, Image resolution, Magnetism, Spectroscopy, Spectral resolution, Multiplexing, Cooling systems, Magnetic sensors, Optical filters

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Proceedings Article | 26 September 2007 Paper

Technologies for cooling of large distributed and deployable loads

A. Kashani, J. Maddocks, G. Nellis, Y. Gianchandani

Proceedings Volume 6678, 667804 (2007) https://doi.org/10.1117/12.734351

KEYWORDS: Cryogenics, Control systems, Cryocoolers, Head, Temperature metrology, Microelectromechanical systems, Silicon, Actuators, Interfaces, Copper

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Proceedings Article | 13 October 1997 Paper

Detector mount system for thermal isolation

Mark Sullivan, Matthew Bye, Paul Ehrensberger, Enrique Romero, Howard Demroff, Scott Fletcher, Daniel DeBra, John Goebel, Paul Limtiaco, Donald Davidson, Lynn Huff, Ada Jefferson, Ali Kashani, Dale Gill, Kenneth Triebes, Jeff Grant

Proceedings Volume 3132, (1997) https://doi.org/10.1117/12.290178

KEYWORDS: Sensors, Telescopes, Optical isolators, Space telescopes, Cryogenics, Electronics, Quartz, Gyroscopes, Beam splitters, Photodiodes

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