SRF2011 - List of Authors (Hoffstaetter, G.H.)

Paper

Title

Page

Recent SRF Developments for ERLs

13

G.H. Hoffstaetter, M. Tigner
CLASSE, Ithaca, New York, USA

Research and Development of SRF technology is being advanced around the world. We review developments in Europe, Asia and North America citing specifics from Helmholtz Zentrum Berlin, KEK, JLab and Cornell. These programs are designed in part to improve BBU control, power coupling and Qo which is crucial for minimizing power consumption for operation of ERLs as CW sources of high-current low-emittance beams.

Slides MOIOA03 [5.475 MB]

MOPO016

Superconducting RF for the Cornell Energy-Recovery Linac Main Linac

90

M. Liepe, Y. He, G.H. Hoffstaetter, S. Posen, J. Sears, V.D. Shemelin, M. Tigner, N.R.A. Valles, V. Veshcherevich
CLASSE, Ithaca, New York, USA

Funding: Supported by NSF award DMR-0807731.
Cornell University is developing the superconducting RF technology required for the construction of a 100 mA hard X-ray light source driven by an Energy-Recovery Linac. Prototype components of the 5 GeV cw SRF main linac cryomodule are under development, fabrication and testing. This work includes an optimized 7-cell SRF cavity, a broadband HOM beamline absorber, and a 5 kW cw RF input coupler. In this paper we give an overview of these activities at Cornell.

THPO012

Influence of Foreign Particles on the Quality Factor of a Superconducting Cavity

728

V.D. Shemelin, G.H. Hoffstaetter
CLASSE, Ithaca, New York, USA

Funding: Supported by NSF award DMR-0807731.
The quality factor of superconducting (SC) cavities of the Cornell Energy Recovery Linac (ERL) Injector measured in its horizontal cryostat appears systematically lower than in vertical tests. Furthermore, this lower value of the Q factor is scattered in a range of about Here, an explanation of these effects is presented taking into account contamination of the cavities by microscopic particles of ferrite used in the higher order mode (HOM) loads and other particles present in the vicinity of cavities during assembly of the horizontal cryostat. The average Q degradation and the scatter of Q values are used to estimate the size and the number of contaminants per cavity. We also analyze, which materials have relevant contaminants.

Paper	Title	Page
MOIOA03	Recent SRF Developments for ERLs	13
	G.H. Hoffstaetter, M. Tigner CLASSE, Ithaca, New York, USA
	Research and Development of SRF technology is being advanced around the world. We review developments in Europe, Asia and North America citing specifics from Helmholtz Zentrum Berlin, KEK, JLab and Cornell. These programs are designed in part to improve BBU control, power coupling and Qo which is crucial for minimizing power consumption for operation of ERLs as CW sources of high-current low-emittance beams.
	Slides MOIOA03 [5.475 MB]

MOPO016	Superconducting RF for the Cornell Energy-Recovery Linac Main Linac	90
	M. Liepe, Y. He, G.H. Hoffstaetter, S. Posen, J. Sears, V.D. Shemelin, M. Tigner, N.R.A. Valles, V. Veshcherevich CLASSE, Ithaca, New York, USA
	Funding: Supported by NSF award DMR-0807731. Cornell University is developing the superconducting RF technology required for the construction of a 100 mA hard X-ray light source driven by an Energy-Recovery Linac. Prototype components of the 5 GeV cw SRF main linac cryomodule are under development, fabrication and testing. This work includes an optimized 7-cell SRF cavity, a broadband HOM beamline absorber, and a 5 kW cw RF input coupler. In this paper we give an overview of these activities at Cornell.

THPO012	Influence of Foreign Particles on the Quality Factor of a Superconducting Cavity	728
	V.D. Shemelin, G.H. Hoffstaetter CLASSE, Ithaca, New York, USA
	Funding: Supported by NSF award DMR-0807731. The quality factor of superconducting (SC) cavities of the Cornell Energy Recovery Linac (ERL) Injector measured in its horizontal cryostat appears systematically lower than in vertical tests. Furthermore, this lower value of the Q factor is scattered in a range of about Here, an explanation of these effects is presented taking into account contamination of the cavities by microscopic particles of ferrite used in the higher order mode (HOM) loads and other particles present in the vicinity of cavities during assembly of the horizontal cryostat. The average Q degradation and the scatter of Q values are used to estimate the size and the number of contaminants per cavity. We also analyze, which materials have relevant contaminants.