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Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO
- Source :
- Adaptive Optics Systems V.
- Publication Year :
- 2016
- Publisher :
- SPIE, 2016.
-
Abstract
- HARMONI is a visible and near-infrared integral field spectrograph designed to be a first-light instrument on the European extremely large telescope. It will use both single-conjugate and laser tomographic adaptive optics to fully exploit high-performance and sky coverage. Using a fast AO modelling toolbox, we simulate anisoplanatism effects on the point spread function of the single-conjugate adaptive optics of HARMONI. We investigate the degradation of the correction performance with respect to the off-axis distance in terms of Strehl ratio and ensquared energy. In addition, we analyse what impact the natural guide source magnitude, AO sampling frequency and number of sub-apertures have on performance. We show, in addition to the expected PSF degradation with the field direction, that the PSF retains a coherent core even at large off-axis distances. We demonstrated the large performance improvement of fine tuning the sampling frequency for dimer natural guide stars and an improvement of approx. 50% in SR can be reached above the nominal case. We show that using a smaller AO system with only 20x20 sub-apertures it is possible to further increase performance and maintain equivalent performance even for large off-axis angles.
- Subjects :
- Point spread function
Physics
010308 nuclear & particles physics
business.industry
media_common.quotation_subject
Astrophysics::Instrumentation and Methods for Astrophysics
Strehl ratio
01 natural sciences
Encircled energy
Optics
Integral field spectrograph
Sky
0103 physical sciences
Extremely Large Telescope
Performance improvement
business
Adaptive optics
010303 astronomy & astrophysics
media_common
Subjects
Details
- ISSN :
- 0277786X
- Database :
- OpenAIRE
- Journal :
- Adaptive Optics Systems V
- Accession number :
- edsair.doi...........fc7c184b120585c725dcc7b30b9e0aab