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HSFA 2 technical description Technical Details

Spectrograph HSFA2
(Horizontal-Sonnen-Forschungs-Anlage)

Description and Technical Details

In 1980s two medium-size horizontal solar telescopes 50/35000 cm with large spectrographs Czerny-Turner made by Carl Zeiss Jena were installed in the Ondњejov observatory. The Czerny-Turner-spectrographs in the Ondњejov observatory called HSFA1 and HSFA2 according to the German name Horizontal-Sonnen-Forschungs-Anlage ("horizontal device for solar research") have been explored for more than two decades. A process of modernization was completed recently. The reconstruction of the optical parts of the spectrograph of the HSFA2, which is supposed to be overbuilded into a multichannel spectrograph operating simultaneously in several diagnostically important spectral lines, is decribed briefly.

The high quality equipment of the HSFA2 was made by Carl Zeiss, Jena. There is a better resolution (angular resolution is 0.33" for H-alpha, the chromatic resolution is 12.60 mA for H-alpha) and high quality optics. The HSFA2 is placed about 400m far away from the main building in a forrest. There are no streets and buildings in the neighbourhood of the spectrograph room or other unwanted source of air-convection. The height of the coelestat above the ground is about 6 m. But there are several disadvantages. The HSFA2 is more complicated to activate due to the installed hydraulic system which is usable only by temperature above 5ђC. Other problem was that the original grating and objective were dedicated for configurations of larger detectors. But the main problem was the fact that we had a limited space inside the spectrograph-room. The long and narrow room was designed for a one-way-spectrograph.

Parameters HSFA2

  1. diameter of the telescope primary mirror DT=500 mm

    - focal lentgh of the telescope primary mirror fmirr=35 m

    - focal lentgh of the collimator mirror fcoll=10 m

  2. Diffraction grating - Richardson, Spectra-Physics

    - nominal blaze angle - 17.5

    - nominal wavelengh 1st order (Littrow) - 500 nm

    - the width of the diffraction grating W=206 mm

    - the height of the diffraction grating H=154 mm

    - number of grooves per mm - 1200

    Camera - VDS Vosskuehler: CCD-1300LN

    - size of one pixel 6.7 μm x 6.7 μm

    - size of the chip 1280(H) x 1024(V) pixels

§Optical scheme§ §Electtrical scheme§ §Manual HSFA2§ §Install frame-grabber §Images HSFA-2§


Soft

REFERENCES

  1. Kotrш P., Kschioneck K.: 2003; From Czerny-Turner to a Multichannel Spectrograph, from Photografic to CCD Detectors ; in Proc. of the International Solar Cycle Studies 2003 Symposium: "SOLAR VARIABILITY AS AN INPUT TO THE EARTH`S ENVIRONMENT", held June 23-28, 2003, Tatranska Lomnica, Slovak Republic, ESA SP-535, A. Wilson (ed.), p. 717-722.
  2. Klva?a M., Sobotka M., Kotrш P., KnэЮek M., Heinzel P.: Reconstruction of the HSFA telescopes, Astronomische Nachrichten, Vol. 322, p. 371-374., 2001
  3. Kotrc P., Kupryakov Yu. A., J. Lesko: 2006; Modernizovany opticky spektrograf v Ondrejove - popis, data, zkusenosti, vyhledy; Zbornik referatov z 18. celostatneho slnecneho seminara, Modra, cerven 2006, editor I. Dorotovic, SUH Hurbanovo, publikovano na CD prispevek c. 31.
  4. P. Kotrc, E. V. Kononovich, Yu. A. Kupryakov:2007; Solar spectral observations at the Ondrejov Observatory with Moscow State University cooperation ; Astronomical and Astrophysical Transactions Vol. 26, Nos. 4-5, August-October 2007, 267-273.