PAC09 - List of Authors (Sredniawski, J.J.)

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Sredniawski, J.J.

Paper	Title	Page
WE6RFP001	Lowering the Cost of the ILC SRF Cavity Helium Vessel	2778
	J.J. Sredniawski, D. Holmes, T. Schultheiss AES, Medford, NY
	Funding: Work supported by The Department of Energy under SBIR Contract DE-FG02-08ER85054 From past work we found that within the cost of the String Assembly that dominates the overall cost of the cryomodules for ILC, the greatest cost elements are the helium vessel with the 2 phase pipe assembly, the niobium material, and the SRF cavity fabrication. The cost of niobium is dependant upon market supply and demand and is essentially out of our control. We have carried out an aggressive study to reduce the cost of cavity fabrication in a high production environment, which leaves the helium vessel for further investigation. It is recognized that significant cost savings may be realized if the helium vessel could be constructed of stainless steel instead of titanium material as is currently planned. To facilitate this change (AES) has designed a niobium to stainless steel transition assembly that will interface the helium vessel to the SRF Cavity at each end. Details of the design and analysis of the low cost helium vessel assembly are discussed along with potential cost reductions for the ILC high production run. E. Bonnema, J. Sredniawski,"ILC RF Unit Industrial Cost Study Methodology & Results" **A. Favale, J. Sredniawski, M. Calderaro, E. Peterson,"ILC Cavity Fabrication Optimization for High Production"

Paper

Title

Page

WE6RFP001

Lowering the Cost of the ILC SRF Cavity Helium Vessel

2778

J.J. Sredniawski, D. Holmes, T. Schultheiss
AES, Medford, NY

Funding: Work supported by The Department of Energy under SBIR Contract DE-FG02-08ER85054

From past work we found that within the cost of the String Assembly that dominates the overall cost of the cryomodules for ILC, the greatest cost elements are the helium vessel with the 2 phase pipe assembly, the niobium material, and the SRF cavity fabrication*. The cost of niobium is dependant upon market supply and demand and is essentially out of our control. We have carried out an aggressive study to reduce the cost of cavity fabrication in a high production environment**, which leaves the helium vessel for further investigation. It is recognized that significant cost savings may be realized if the helium vessel could be constructed of stainless steel instead of titanium material as is currently planned. To facilitate this change (AES) has designed a niobium to stainless steel transition assembly that will interface the helium vessel to the SRF Cavity at each end. Details of the design and analysis of the low cost helium vessel assembly are discussed along with potential cost reductions for the ILC high production run.

*E. Bonnema, J. Sredniawski,"ILC RF Unit Industrial Cost Study Methodology & Results"
**A. Favale, J. Sredniawski, M. Calderaro, E. Peterson,"ILC Cavity Fabrication Optimization for High Production"