New generation Multichannel Subtractive Double Pass for imaging spectropolarimetry – The S4I prototype

F. Sayede; P. Mein; J.-P. Amans; J. Moity

doi:10.1051/eas/1255055

All issues

Volume 55 (2012)

EAS Publications Series, 55 (2012) 385-388

Abstract

Issue		EAS Publications Series Volume 55, 2012 4th French-Chinese Meeting on Solar Physics - Understanding Solar Activity: Advances and Challenges


Page(s)		385 - 388
Section		Instrumentation
DOI		https://doi.org/10.1051/eas/1255055
Published online		27 June 2012

Understanding Solar Activity: Advances and Challenges
M. Faurobert, C. Fang and T. Corbard (eds)
EAS Publications Series, 55 (2012) 385-388

New generation Multichannel Subtractive Double Pass for imaging spectropolarimetry – The S4I prototype

F. Sayede¹, P. Mein², J.-P. Amans¹ and J. Moity²

¹ GEPI, Observatoire de Paris, 5 place Jules Janssen, 92195 Meudon, France
² LESIA, Observatoire de Paris, CNRS, UPMC Paris 06, Université Paris Diderot, 5 place Jules Janssen, 92195 Meudon, France

Abstract

Imaging spectropolarimetry is a powerful tool in solar physics. Multichannel Subtractive Double Pass (MSDP) spectrographs can produce simultaneous 2D images in a number of wavelengths covering several line profiles with the following advantages:

- Contrary to long slit spectroscopy, the spatial resolution can reach the diffraction limit.

- Contrary to narrow band filters, full line profiles are recorded at the same time without any image motion and differential seeing effect.

MSDP spectrographs use an entrance window instead of the usual long slit. A new generation MSDP using slicers made of mirrors instead of prisms is proposed for the future 4 m class European Solar Telescope. We describe the beam slicer prototype S4I (Spectral Sampling with Slicer for Solar Instrumentation) that will be tested soon at the 14 m spectrograph of the Meudon Solar Tower.