SRF2011 - List of Authors (Olry, G.)

Paper

Title

Page

Electromechanical Design of 704MHz β 0.65 SC Proton Cavity

110

H. Gassot, F.B. Bouly, G. Olry, S. Rousselot
IPN, Orsay, France

Funding: European Coordination for Accelerator Research & Development (EuCARD)
Within the framework of the EUCARD, IPN Orsay is in charge of design of a 704MHz elliptic superconducting cavity for β = 0.65 high intensity proton linac in pulsed mode. This study offers a new option to replace the injector of the Large Hadron Collider at CERN with SPL (Superconducting Proton Linac) project. For this cavity's design, a compromise between the requirements of high technological performances and the constraint of the cavity's cost should be found. As middle beta elliptical cavity has a big ratio between equator radian and iris radian, the mechanical deformations generate important Lorentz forces detuning. As a consequence, the cavity wall thickness should be increased and one or two stiffening rings between cells are necessary. The additional cost should be imperatively minimized since more than fifty β 0.65 cavities are considered for SPL linac. To do these optimizations, the electromechanical calculations are performed via our simulation platform, which drives and links CATIA for CAD, Cast3m for mechanics and Opera3d for RF. The final design of cavity is presented in this paper.

MOPO039

Low-β Triple Spoke Cavity Design Improvement for Proton Linac

177

H. Gassot, S. Bousson, G. Olry, S. Rousselot
IPN, Orsay, France

Funding: EURISOL (European Isotope-Separation-On-Line Facility) supported by the 6th PCRD of the European Union
Within the framework of the EURISOL, IPN Orsay has proposed a 352MHz triple-spoke superconducting cavity: for the low energy section (beta = 0.3) of high power proton linear accelerators. In terms of structure design, a triple-spoke superconducting cavity has a complicated geometry, 3D modelling is necessary. More, the design requires simulations which couple electromagnetism with mechanics. To perform these tasks, the mechanics simulation code CAST3M (Calcul et Analyse de Structure et Thermique par la méthode des Eléments Finis) has been linked to the electromagnetism code Opera3D via a dedicated platform, which has been developed for this purpose. This work allows the instantaneous passage from CAD (CATIA) design to mechanical calculations using Cast3m and electromagnetic simulations with Opera3D. As a consequence, the delay of design studies has been considerably reduced. The mathematical advances of the simulation platform are summarized. The electromagnetic and mechanical behaviours of the triple-spoke are presented and discussed in this paper.

THIOB05

SPL Cavity Development

684

G. Olry
IPN, Orsay, France

The Superconducting Proton Linac (SPL) is planned as a 4MW machine in pulsed operation at CERN. Two families (beat = 0.65 and β = 1.0) of 5 cell superconducting elliptical cavities, operating at 704.4 MHz, will be used to accelerate H− beam from 160 MeV up to 5 GeV. One of the main challenge is the nominal gradient required for both cavities type: 19 MV/m for the β=0.65 and 25 MV/m for the β=1. Several prototypes of elliptical cavities have been studied by different laboratories (CERN, CEA/Saclay, BNL, IPN Orsay) through a large collaboration (EuCARD program, French and US in-kind contribution) and are now ready for fabrication. First of all, we will present the work done on RF and mechanical optimizations as well as the studies on HOMs. Then, we will give an overview of the short-cryomodule design, housing four β=1.0 cavities, which should be tested at CERN.

FRIOA04

Power Couplers for Spiral-2

947

Y. Gómez Martínez, T. Cabanel, J. Giraud, R. Micoud, M. Migliore, J. Morfin, F. Vezzu
LPSC, Grenoble Cedex, France
P.-E. Bernaudin, P. Bosland
CEA/DSM/IRFU, France
G. Olry
IPN, Orsay, France

The Spiral 2 facility is in construction phase. The driver is a super-conducting linac composed of two types of QWR cavities, β = 0.07 and 0.12 operated at 88 MHz. Each cavity is fed by a Radio Frequency antenna coupler designed to accept up to 40kW CW. The tests of the prototype couplers have been successfully achieved in the two types of cavities. The manufacturing is finished and the processing of the 26 couplers is under way. We report the technological choices and the major issues of the process, including the absence of TiN plating. We present the main results of the tests and the processing of the couplers.

Slides FRIOA04 [1.459 MB]

Paper	Title	Page
MOPO021	Electromechanical Design of 704MHz β 0.65 SC Proton Cavity	110
	H. Gassot, F.B. Bouly, G. Olry, S. Rousselot IPN, Orsay, France
	Funding: European Coordination for Accelerator Research & Development (EuCARD) Within the framework of the EUCARD, IPN Orsay is in charge of design of a 704MHz elliptic superconducting cavity for β = 0.65 high intensity proton linac in pulsed mode. This study offers a new option to replace the injector of the Large Hadron Collider at CERN with SPL (Superconducting Proton Linac) project. For this cavity's design, a compromise between the requirements of high technological performances and the constraint of the cavity's cost should be found. As middle beta elliptical cavity has a big ratio between equator radian and iris radian, the mechanical deformations generate important Lorentz forces detuning. As a consequence, the cavity wall thickness should be increased and one or two stiffening rings between cells are necessary. The additional cost should be imperatively minimized since more than fifty β 0.65 cavities are considered for SPL linac. To do these optimizations, the electromechanical calculations are performed via our simulation platform, which drives and links CATIA for CAD, Cast3m for mechanics and Opera3d for RF. The final design of cavity is presented in this paper.

MOPO039	Low-β Triple Spoke Cavity Design Improvement for Proton Linac	177
	H. Gassot, S. Bousson, G. Olry, S. Rousselot IPN, Orsay, France
	Funding: EURISOL (European Isotope-Separation-On-Line Facility) supported by the 6th PCRD of the European Union Within the framework of the EURISOL, IPN Orsay has proposed a 352MHz triple-spoke superconducting cavity: for the low energy section (beta = 0.3) of high power proton linear accelerators. In terms of structure design, a triple-spoke superconducting cavity has a complicated geometry, 3D modelling is necessary. More, the design requires simulations which couple electromagnetism with mechanics. To perform these tasks, the mechanics simulation code CAST3M (Calcul et Analyse de Structure et Thermique par la méthode des Eléments Finis) has been linked to the electromagnetism code Opera3D via a dedicated platform, which has been developed for this purpose. This work allows the instantaneous passage from CAD (CATIA) design to mechanical calculations using Cast3m and electromagnetic simulations with Opera3D. As a consequence, the delay of design studies has been considerably reduced. The mathematical advances of the simulation platform are summarized. The electromagnetic and mechanical behaviours of the triple-spoke are presented and discussed in this paper.

THIOB05	SPL Cavity Development	684
	G. Olry IPN, Orsay, France
	The Superconducting Proton Linac (SPL) is planned as a 4MW machine in pulsed operation at CERN. Two families (beat = 0.65 and β = 1.0) of 5 cell superconducting elliptical cavities, operating at 704.4 MHz, will be used to accelerate H− beam from 160 MeV up to 5 GeV. One of the main challenge is the nominal gradient required for both cavities type: 19 MV/m for the β=0.65 and 25 MV/m for the β=1. Several prototypes of elliptical cavities have been studied by different laboratories (CERN, CEA/Saclay, BNL, IPN Orsay) through a large collaboration (EuCARD program, French and US in-kind contribution) and are now ready for fabrication. First of all, we will present the work done on RF and mechanical optimizations as well as the studies on HOMs. Then, we will give an overview of the short-cryomodule design, housing four β=1.0 cavities, which should be tested at CERN.

FRIOA04	Power Couplers for Spiral-2	947
	Y. Gómez Martínez, T. Cabanel, J. Giraud, R. Micoud, M. Migliore, J. Morfin, F. Vezzu LPSC, Grenoble Cedex, France P.-E. Bernaudin, P. Bosland CEA/DSM/IRFU, France G. Olry IPN, Orsay, France
	The Spiral 2 facility is in construction phase. The driver is a super-conducting linac composed of two types of QWR cavities, β = 0.07 and 0.12 operated at 88 MHz. Each cavity is fed by a Radio Frequency antenna coupler designed to accept up to 40kW CW. The tests of the prototype couplers have been successfully achieved in the two types of cavities. The manufacturing is finished and the processing of the 26 couplers is under way. We report the technological choices and the major issues of the process, including the absence of TiN plating. We present the main results of the tests and the processing of the couplers.
	Slides FRIOA04 [1.459 MB]