Kottamia Faint Imaging Spectro-Polarimeter (KFISP): opto-mechanical design, software control and performance analysis View Full Text


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Article Info

DATE

2021-10-13

AUTHORS

Yosry A. Azzam, F. I. Y. Elnagahy, Gamal B. Ali, A. Essam, Somaya Saad, Hamed Ismail, I. Zead, Nasser M. Ahmed, Michitoshi Yoshida, Koji S. Kawabata, Hiroshi Akitaya, A. Shokry, Y. H. M. Hendy, Ali Takey, G. M. Hamed, Peter Mack

ABSTRACT

In this paper we describe the Kottamia Faint Imaging Spectro-Polarimeter (KFISP) that has been recently developed and designed to be mounted at the Cassegrain focus of the 1.88 m telescope at Kottamia Astronomical Observatory (KAO), Egypt. The optical design of KFISP is developed such that it can be used in various modes of operation. These are: direct imaging, spectroscopic, polarimetric imaging, and spectro-polarimetric. The KFISP is an all-refractive design to meet the polarimetric requirements and includes a focal reducer with a corrector section, collimator section, parallel beam section (containing various imaging components), and camera section. The corrector section gives an unvignetted Field-of-View of 8' × 8' and the collimator section has a focal length of 305 mm and matches the focal ratio of the input beam. The parallel beam section is 200 mm long and near the middle of it there is an image of the telescope pupil. The camera section includes 5 elements and has a focal length of 154.51 mm which gives an instrument effective final focal ratio of f/6.14 (acting as a telescope focal reducer of 1:2 ratio). The KFISP contains an internal calibration system which hosts the calibration light injection system, an integrating sphere equipped with the required calibration light sources. The opto-mechanical parts of KFISP contain a double-layered carbon fiber strut structure and comprises its subsystems of slit and guider assemblies, filter wheel drawer, grism wheel drawer, polarimetric components cubical box, and CCD camera which is integrated with camera optics. The CCD camera has 2048 × 2048 pixels with 13.5-micron square pixel size. The camera is cooled by liquid Nitrogen and is fixed to the KFISP through the integrated camera lens. The KFISP has been fully commissioned, mounted and is being tested in all modes of operation. In this paper we introduce the ambitious scientific goals, the optical setups of KFISP, its opto-mechanical implementation and the performance analysis of the instrument. In addition, we describe the camera system, its performance, and its software control. Finally, we present a sample of the first light observations obtained from the instrument. More... »

PAGES

1-26

References to SciGraph publications

  • 2004-01-01. Kottamia Telescope Upgrading in DEVELOPING BASIC SPACE SCIENCE WORLD-WIDE
  • 1986-01. Astronomical research activities with the 74 inch telescope at Kottamia observatory in ASTROPHYSICS AND SPACE SCIENCE
  • 1955-04. Achromatic combinations of birefringent plates in PROCEEDINGS - MATHEMATICAL SCIENCES
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10686-021-09802-z

    DOI

    http://dx.doi.org/10.1007/s10686-021-09802-z

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1141837499

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/34658528


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    9 schema:description In this paper we describe the Kottamia Faint Imaging Spectro-Polarimeter (KFISP) that has been recently developed and designed to be mounted at the Cassegrain focus of the 1.88 m telescope at Kottamia Astronomical Observatory (KAO), Egypt. The optical design of KFISP is developed such that it can be used in various modes of operation. These are: direct imaging, spectroscopic, polarimetric imaging, and spectro-polarimetric. The KFISP is an all-refractive design to meet the polarimetric requirements and includes a focal reducer with a corrector section, collimator section, parallel beam section (containing various imaging components), and camera section. The corrector section gives an unvignetted Field-of-View of 8' × 8' and the collimator section has a focal length of 305 mm and matches the focal ratio of the input beam. The parallel beam section is 200 mm long and near the middle of it there is an image of the telescope pupil. The camera section includes 5 elements and has a focal length of 154.51 mm which gives an instrument effective final focal ratio of f/6.14 (acting as a telescope focal reducer of 1:2 ratio). The KFISP contains an internal calibration system which hosts the calibration light injection system, an integrating sphere equipped with the required calibration light sources. The opto-mechanical parts of KFISP contain a double-layered carbon fiber strut structure and comprises its subsystems of slit and guider assemblies, filter wheel drawer, grism wheel drawer, polarimetric components cubical box, and CCD camera which is integrated with camera optics. The CCD camera has 2048 <math><mo>×</mo></math> 2048 pixels with 13.5-micron square pixel size. The camera is cooled by liquid Nitrogen and is fixed to the KFISP through the integrated camera lens. The KFISP has been fully commissioned, mounted and is being tested in all modes of operation. In this paper we introduce the ambitious scientific goals, the optical setups of KFISP, its opto-mechanical implementation and the performance analysis of the instrument. In addition, we describe the camera system, its performance, and its software control. Finally, we present a sample of the first light observations obtained from the instrument.
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    14 schema:keywords Astronomical Observatory
    15 CCD camera
    16 Cassegrain focus
    17 Egypt
    18 Faint Imaging Spectro-Polarimeter
    19 Imaging Spectro-Polarimeter
    20 KFISP
    21 Kottamia Astronomical Observatory
    22 Observatory
    23 Spectro-Polarimeter
    24 addition
    25 ambitious scientific goals
    26 analysis
    27 assembly
    28 beam
    29 beam section
    30 box
    31 calibration light injection system
    32 calibration light source
    33 calibration system
    34 camera
    35 camera lens
    36 camera optics
    37 camera section
    38 camera system
    39 carbon fiber
    40 collimator section
    41 components cubical box
    42 control
    43 corrector section
    44 cubical box
    45 design
    46 direct imaging
    47 double-layered carbon fiber
    48 drawer
    49 effective final focal ratio
    50 elements
    51 fibers
    52 field
    53 filter wheel drawer
    54 final focal ratio
    55 first light observations
    56 focal length
    57 focal ratio
    58 focal reducer
    59 focus
    60 goal
    61 grism wheel drawer
    62 guider assemblies
    63 images
    64 imaging
    65 implementation
    66 injection system
    67 input beam
    68 instrument
    69 instrument effective final focal ratio
    70 internal calibration system
    71 length
    72 lens
    73 light injection system
    74 light observations
    75 light source
    76 liquid nitrogen
    77 mechanical design
    78 middle
    79 mode
    80 mode of operation
    81 nitrogen
    82 observations
    83 operation
    84 optical design
    85 optical setup
    86 optics
    87 opto-mechanical implementation
    88 opto-mechanical parts
    89 paper
    90 parallel beam section
    91 part
    92 performance
    93 performance analysis
    94 pixel size
    95 pixels
    96 polarimetric components cubical box
    97 polarimetric imaging
    98 polarimetric requirements
    99 pupils
    100 ratio
    101 reducer
    102 refractive design
    103 required calibration light sources
    104 requirements
    105 samples
    106 scientific goals
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    108 setup
    109 size
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    111 software control
    112 source
    113 sphere
    114 square pixel size
    115 structure
    116 subsystems
    117 subsystems of slit
    118 system
    119 telescope
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    121 unvignetted Field
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