[On_site_list] Colloquium: Today, 3 p.m.: The Pursuit of Better SRF Cavities - The Bar Has Been Raised

[deborah magaldi]

JEFFERSON LAB COLLOQUIUM

The Pursuit of Better SRF Cavities - The Bar Has Been Raised

Charlie Reece
SRF Institute
Jefferson Lab

Abstract

Superconducting niobium RF (radiofrequency) cavities provide a 
remarkably efficient way to accelerate charged particles, especially for 
CW (continuous wave) applications. Practical cost pressures continue to 
motivate development of ever more energy efficient and lower-capital 
cost systems. The push to realize reliable SRF cavity surfaces with very 
low surface resistance (also known as high Q^0 ) with maximally high 
surface fields is the constant challenge for SRF technology R&D.Recent 
developments have dramatically changed what we understand to be "ideal" 
theoretical performance and have also opened the door to practical 
realization of accelerators with cryogenic heat budgets cut by more than 
60 percent. Both theory and experiment point to a surprising decrease in 
surface resistance with increasing RF field amplitude; a collaborative 
effort involving JLab, FNAL, Cornell, and HZB has made significant 
progress characterizing and learning to manage this phenomenon. The 
LCLS-II project is already committed to exploiting these new 
developments to minimize cryogenic capital and operating costs. These 
new understandings and associated challenges will be reviewed in their 
historical international and JLab context.


Wednesday, Oct. 22, 2014 at 3 p.m.

CEBAF Center auditorium

Cookies & coffee in the CEBAF Center lobby, 2:30 p.m.

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