Accelerator Seminar: Ganapati Myneni

Speaker: Ganapati Myneni

S&T Lessons Learned – The Good, The Bad and The Ugly

Abstract: In this presentation, I will share the lessons learned starting from my humble S&T journey beginning as a Research Scholar at IITM Chennai, India to present and their relevance to SRF technology advances and for futuristic Thorium based green energy systems in order to provide clean air and clean water for the humanity.

The S&T of SRF cavities involve intrinsic and extrinsic contamination of niobium surfaces. The extrinsic contaminates are molecular and/or particulates and the intrinsic contaminant is mostly hydrogen. These contaminants need to be completely eliminated to obtain the maximum possible accelerating gradients and high-quality factors with niobium cavities. So let us first briefly look back at the contamination control aspects that are very critical to achieve and maintain high performance SRF cavity structures in accelerator systems. Additionally, let us review the niobium production technologies namely fine grain (FG), medium grain (MG) & large grain (LG) and pros and cons of choosing best one of them to produce cost effective and high-performance accelerator structures for science frontiers as well as industrial applications. Finally, the performance limiting hydrogen problem/issue in the current SRF technology need to be carefully evaluated, scientific approaches have to be invented and implemented to achieve the required Eacc and Q0. KEK/JLab is in an advantageous and envious position to lead the worlds SRF community to greater heights. Compton sources by frequency chirping extend to the highest harmonics emitted from the source and are remarkably insensitive to being degraded by electron beam thermal effects.

https://www.jlab.org/accelerator/seminars