[Cuga] **TODAY**Pizza Seminar Series- Wednesday, September 21, 2011- A message from Hari Areti

[Lorelei Carlson]

    Seminar is today. See you there!

Wednesday, September 21, 2011
****CC F113****
12:00-1:00pm

*International Linear Collider (ILC), Superconducting Radio Frequency 
(SRF) Acceleration, and ILC High-Gradient SRF Cavity R&D at Jefferson Lab*


*Rong-Li Geng*

Thomas Jefferson National Accelerator Facility


Abstract:

The International Linear Collider (ILC) is a proposed future colliding 
beam machine (500 GeV center of mass) based on superconducting radio 
frequency (SRF) electron/positron linacs, the same technology pioneered 
by the SRF electron linacs at CEBAF. An international team of 
accelerator experts is about to be completing the technical design of 
ILC in 2012. The acceleration gradient of SRF cavities is a crucial 
parameter in governing the energy reach as well as the cost of the 
machine. With the support of DOE HEP's ILC program and in collaboration 
with Fermilab, Cornell, KEK and DESY etc, Jefferson Lab has been 
involved in the ILC cavity high gradient R&D since 2006. This effort 
resulted in the state-of-the-art gradient performance in the 1-meter 
long ILC cavities. A major fruit of JLab's ILC high gradient program is 
the establishment of repeatable electropolishing of the cavity RF 
surface for reproducible gradient performance. This success not only 
helped defend the ILC gradient choice but also laid foundation of the 
final surface processing technology for the SRF cavities of the CEBAF 12 
GeV upgrade project.  In this talk, I will: (1) briefly introduce the 
ILC; (2) highlights JLab's high gradient cavity R&D results; (3) 
presents the improved understanding of the physics of the cavity 
performance (gradient and quality factor) limits. I will also outlines 
future opportunities for high performance SRF cavity development 
presented by the ILC 1 TeV upgrade design.        


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