SRF2011 - List of Authors (Kazakov, S.)

Paper

Title

Page

High Power Couplers for the Project X Linac

361

S. Kazakov, M.S. Champion, S. Cheban, T.N. Khabiboulline, M. Kramp, Y. Orlov, O. Pronitchev, V.P. Yakovlev
Fermilab, Batavia, USA

Project X, a multi-megawatt proton source under development at Fermi National Accelerator Laboratory. [1]. The key element of the project is a superconducting (SC) 3GV continuous wave (CW) proton linac. The linac includes 5 types of SC accelerating cavities of two frequencies.(325 and 650MHz) The cavities consume up to 30 kW average RF power and need proper main couplers. Requirements and approach to the coupler design are discussed in the report. Results of electrodynamics and thermal simulations are presented. New cost effective schemes are described.

TUPO009

How to Eliminate a Copper Coating and to Increase an Average Power of Main Coupler

368

S. Kazakov
Fermilab, Batavia, USA

Idea how to avoid a cooper coating and increase an average power of main coupler by using RF shield is described. RF shield decrease magnetic field at outer wall of coupler, which connected directly to low temperature superconductive (SC) cavity. Shield has thermal contact with coupler at only one point 80K and all RF losses of shield walls are translated to 80K. Cryogenic losses in outer wall of couplers become so small, that there is no need to coat a stainless steel by copper. It decreases a static cryogenic losses as well, simplify technology and promises to make coupler more reliable. More than this, some presented geometries have zero magnetic field around low temperature aria (2K 5K). We can say that coupler “has no dynamic loss” at all.

TUPO042

SLAC/FNAL TTF3 Coupler Assembly and Processing Experience

476

C. Adolphsen, A.A. Haase, C.D. Nantista, J. Tice, F. Wang
SLAC, Menlo Park, California, USA
T.T. Arkan, M.S. Champion, S. Kazakov, A. Lunin, K.S. Premo
Fermilab, Batavia, USA

Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515
The TTF3-style coupler is typically used to power 1.3 GHz TESLA-type superconducting cavities. For the US ILC program, parts purchased in industry for such couplers are received at SLAC where they are inspected, cleaned, assembled as pairs in a Class 10 cleanroom, pumped down, baked at 150 degC and rf processed. The pairs are then shipped to FNAL and installed in cavities that are then tested at input power levels up to 300 kW. This paper describes the coupler results to date including improvements to the procedures and efforts to mitigate problems that have been encountered. Also progress on building a cold coupler section without e-beam wielding is presented.

Poster TUPO042 [0.712 MB]

Paper	Title	Page
TUPO006	High Power Couplers for the Project X Linac	361
	S. Kazakov, M.S. Champion, S. Cheban, T.N. Khabiboulline, M. Kramp, Y. Orlov, O. Pronitchev, V.P. Yakovlev Fermilab, Batavia, USA
	Project X, a multi-megawatt proton source under development at Fermi National Accelerator Laboratory. [1]. The key element of the project is a superconducting (SC) 3GV continuous wave (CW) proton linac. The linac includes 5 types of SC accelerating cavities of two frequencies.(325 and 650MHz) The cavities consume up to 30 kW average RF power and need proper main couplers. Requirements and approach to the coupler design are discussed in the report. Results of electrodynamics and thermal simulations are presented. New cost effective schemes are described.

TUPO009	How to Eliminate a Copper Coating and to Increase an Average Power of Main Coupler	368
	S. Kazakov Fermilab, Batavia, USA
	Idea how to avoid a cooper coating and increase an average power of main coupler by using RF shield is described. RF shield decrease magnetic field at outer wall of coupler, which connected directly to low temperature superconductive (SC) cavity. Shield has thermal contact with coupler at only one point 80K and all RF losses of shield walls are translated to 80K. Cryogenic losses in outer wall of couplers become so small, that there is no need to coat a stainless steel by copper. It decreases a static cryogenic losses as well, simplify technology and promises to make coupler more reliable. More than this, some presented geometries have zero magnetic field around low temperature aria (2K 5K). We can say that coupler “has no dynamic loss” at all.

TUPO042	SLAC/FNAL TTF3 Coupler Assembly and Processing Experience	476
	C. Adolphsen, A.A. Haase, C.D. Nantista, J. Tice, F. Wang SLAC, Menlo Park, California, USA T.T. Arkan, M.S. Champion, S. Kazakov, A. Lunin, K.S. Premo Fermilab, Batavia, USA
	Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515 The TTF3-style coupler is typically used to power 1.3 GHz TESLA-type superconducting cavities. For the US ILC program, parts purchased in industry for such couplers are received at SLAC where they are inspected, cleaned, assembled as pairs in a Class 10 cleanroom, pumped down, baked at 150 degC and rf processed. The pairs are then shipped to FNAL and installed in cavities that are then tested at input power levels up to 300 kW. This paper describes the coupler results to date including improvements to the procedures and efforts to mitigate problems that have been encountered. Also progress on building a cold coupler section without e-beam wielding is presented.
	Poster TUPO042 [0.712 MB]