SRF2011 - List of Authors (Roudier, D.)

Paper

Title

Page

High Power Pulsed Tests of a β=0.5 5-Cell 704 MHz Superconducting Cavity

345

J. Plouin, D. Braud, M. Desmons, G. Devanz, Y. Gasser, E. Jacques, O. Piquet, J.P. Poupeau, D. Roudier, P. Sahuquet
CEA/DSM/IRFU, France
W. Höfle, D. Valuch
CERN, Geneva, Switzerland

A β=0.5 5-cell 704 MHz cavity was developed in the framework of european R&D programs on high intensity pulsed proton injectors. Medium beta elliptical cavities are known to be sensitive to Lorentz detuning, which can become difficult to deal with in pulsed operation. The cavity was optimized to reduce the Lorentz detuning by means of two series of rings welded around the irises, and equipped with a piezo tuning system . In order to test the cavity in pulsed mode, a power coupler with 1 MW capability was connected to the cavity. We report here on the fully equipped cavity tests at 1.8 K carried out in the horizontal cryostat Cryholab at Saclay to study its Rf and mechanical behavior in pulsed mode, mostly with 2 ms pulses at a 50 Hz repetition rate. The compensation of Lorentz force detuning has been achieved at an accelerating gradient of 13 MV/m (44 MV/m peak surface electric field).

Poster TUPO002 [1.917 MB]

THIOB02

Vertical Tests Results of the IFMIF Cavity Prototypes and Cryomodule Development

667

F. Orsini, N. Bazin, P. Bosland, P. Bredy, P. Carbonnier, P. Charon, G. Disset, N. Grouas, P. Hardy, V.M. Hennion, E. Jacques, H. Jenhani, J. Migne, Y. Penichot, J. Plouin, J. Relland, B. Renard, D. Roudier
CEA/IRFU, Gif-sur-Yvette, France
J. Calero, F.M. De Aragon, J.L. Gutiérrez, I. Podadera, S. Sanz, F. Toral, J.G.S. de la Gama
CIEMAT, Madrid, Spain
E.N. Zaplatin
FZJ, Jülich, Germany

In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, an accelerator prototype is presently under design for the first phase of the project. A superconducting option has been chosen for the 5 MeV RF Linac, based on a cryomodule composed of 8 low-beta Half Wave Resonators, 8 Solenoid Packages and 8 RF couplers. This presentation will mainly focus on the HWR development: realization and vertical tests of the two HWR prototypes will be presented, including the validation tests of the innovating cold tuning system, located in the central region of the cavity (results with tuning system are expected for the conference). In addition, the 1st cryomodule current design will be also discussed.

Paper	Title	Page
TUPO002	High Power Pulsed Tests of a β=0.5 5-Cell 704 MHz Superconducting Cavity	345
	J. Plouin, D. Braud, M. Desmons, G. Devanz, Y. Gasser, E. Jacques, O. Piquet, J.P. Poupeau, D. Roudier, P. Sahuquet CEA/DSM/IRFU, France W. Höfle, D. Valuch CERN, Geneva, Switzerland
	A β=0.5 5-cell 704 MHz cavity was developed in the framework of european R&D programs on high intensity pulsed proton injectors. Medium beta elliptical cavities are known to be sensitive to Lorentz detuning, which can become difficult to deal with in pulsed operation. The cavity was optimized to reduce the Lorentz detuning by means of two series of rings welded around the irises, and equipped with a piezo tuning system . In order to test the cavity in pulsed mode, a power coupler with 1 MW capability was connected to the cavity. We report here on the fully equipped cavity tests at 1.8 K carried out in the horizontal cryostat Cryholab at Saclay to study its Rf and mechanical behavior in pulsed mode, mostly with 2 ms pulses at a 50 Hz repetition rate. The compensation of Lorentz force detuning has been achieved at an accelerating gradient of 13 MV/m (44 MV/m peak surface electric field).
	Poster TUPO002 [1.917 MB]

THIOB02	Vertical Tests Results of the IFMIF Cavity Prototypes and Cryomodule Development	667
	F. Orsini, N. Bazin, P. Bosland, P. Bredy, P. Carbonnier, P. Charon, G. Disset, N. Grouas, P. Hardy, V.M. Hennion, E. Jacques, H. Jenhani, J. Migne, Y. Penichot, J. Plouin, J. Relland, B. Renard, D. Roudier CEA/IRFU, Gif-sur-Yvette, France J. Calero, F.M. De Aragon, J.L. Gutiérrez, I. Podadera, S. Sanz, F. Toral, J.G.S. de la Gama CIEMAT, Madrid, Spain E.N. Zaplatin FZJ, Jülich, Germany
	In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power CW accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV, an accelerator prototype is presently under design for the first phase of the project. A superconducting option has been chosen for the 5 MeV RF Linac, based on a cryomodule composed of 8 low-beta Half Wave Resonators, 8 Solenoid Packages and 8 RF couplers. This presentation will mainly focus on the HWR development: realization and vertical tests of the two HWR prototypes will be presented, including the validation tests of the innovating cold tuning system, located in the central region of the cavity (results with tuning system are expected for the conference). In addition, the 1st cryomodule current design will be also discussed.