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Performance evaluation of Littrow lens assembly for Visible Emission Line Corongraph (VELC) on board Aditya-L1 mission

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Abstract

Visible Emission Line Coronagraph (VELC) is the prime payload among the seven payloads on board Aditya-L1 mission. VELC is a dedicated payload for the solar coronal observations. It is capable of simultaneous spectroscopic observations in coronal emission lines 5303 Å, 7892 Å and 10747 Å. Spectrograph of VELC is designed in the Littrow configuration, where same lens system acts as both collimator and camera lens. Performance of Littrow Lens Assembly (LLA) should be optimized for all the three wavelengths, i.e., 5303 Å, 7892 Å and 10747 Å. Also, the diffracted beams from the grating enter the LLA at different off-axis angles. Hence, the performance of the system should be optimized such that the off-axis aberrations are minimized. Being a space based system, constrains such as weight, dimensions and environmental qualification result in stringent requirements on design, fabrication and performance of the LLA. Standalone testing of LLA is crucial to evaluate its performance prior to integrating in the system. This paper provides an overview of the LLA design, detailed discussion about the tests carried out on LLA and the results obtained.

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Acknowledgements

Authors thank all the Scientists/Engineers at the various centres of Indian Space Research Organisation (ISRO) such as URSC, LEOS etc. and Indian Institute of Astrophysics who have made great contributions to the mission to reach at the present state.

Funding

This work is funded by Indian Space Research Organization (ISRO).

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Authors and Affiliations

  1. Indian Institute of Astrophysics, II Block, Koramangala, Bangalore, 560034, India

    Venkata Suresh Narra, Natarajan Venkatasubramanian, Bhavana Hegde, Utkarsha Dasamantarao, Pawan Kumar Somasundaram, Umesh Kamath Padhavu & Raghavendra Prasad Budihal

  2. PI – VELC-ADITYA L1, Indian Institute of Astrophysics, II Block, Koramangala, Bangalore, 560034, India

    Raghavendra Prasad Budihal

  3. LEOS, Indian Space Research Organisation, Bengaluru, India

    Vishweshwar Rao Budhiraju, Bijoy Raha, Rama Subrahmanyam Uppuluri, Venkateswaran Ramaswamy & Sriram Kuppuswamy Venkatesan

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  1. Venkata Suresh Narra
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  2. Vishweshwar Rao Budhiraju
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  3. Natarajan Venkatasubramanian
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  4. Bijoy Raha
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  5. Bhavana Hegde
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  6. Rama Subrahmanyam Uppuluri
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  7. Utkarsha Dasamantarao
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  8. Pawan Kumar Somasundaram
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  9. Venkateswaran Ramaswamy
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  10. Umesh Kamath Padhavu
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  11. Sriram Kuppuswamy Venkatesan
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  12. Raghavendra Prasad Budihal
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Contributions

VSN contributed to the design, performance analysis, testing, data analysis, interpretation and manuscript preparation. BVR contributed to the fabrication, assembly and testing. NV contributed to the design, analysis, fabrication drawings and testing. BR contributed to the fabrication, assembly. BH contributed to the testing and data analysis. RSU contributed to the testing and data analysis. UD contributed to the testing and data analysis. PKS contributed to the design and analysis. VR contributed to the fabrication and assembly. UKP contributed to the design, analysis and testing. SKV contributed to the fabrication, assembly and testing. BRP contributed to the design, performance analysis and testing.

Corresponding author

Correspondence to Venkata Suresh Narra.

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Narra, V.S., Budhiraju, V.R., Venkatasubramanian, N. et al. Performance evaluation of Littrow lens assembly for Visible Emission Line Corongraph (VELC) on board Aditya-L1 mission. J Opt 53, 857–862 (2024). https://doi.org/10.1007/s12596-023-01244-4

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  • DOI: https://doi.org/10.1007/s12596-023-01244-4

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