SRF2011 - List of Authors (Rousselot, S.)

Paper	Title	Page
MOPO005	Conceptual Design of the Superconducting Proton Linac (SPL) Short Cryo-module	43
	V. Parma, P. Bestman, N. Bourcey, O. Capatina, P. Coelho Moreira de Azevedo, E. Montesinos, T. Renaglia, A. Vande Crean, W. Weingarten, L.R. Williams CERN, Geneva, Switzerland P. Dambre, P. Duchesne, P. Duthil, D. Reynet, S. Rousselot IPN, Orsay, France
	Funding: With contribution from EuCARD, Grant Agreement No:227579 The Superconducting Proton Linac (SPL) is an R&D effort conducted by CERN in partnership with other international laboratories, aimed at developing key technologies for the construction of a multi-megawatt proton linac based on state-of-the-art SRF technology, which would serve as a driver for new physics facilities such as neutrinos and radioactive ion beams. Amongst the main objectives of this effort, are the development of 704 MHz bulk niobium β=1 elliptical cavities, operating at 2 K and providing an accelerating field of 25 MV/m, and testing of a string of cavities integrated in a machine-type cryo-module. In an initial phase only 4 out of the 8 cavities of an SPL cryo-module will be tested in a ½ length cryo-module developed for this purpose thus called the Short Cryo-module. This paper presents the conceptual design of the Short Cryo-module, highlighting its innovative principles in terms of cavity supporting and alignment, and describes the integration of cavities and their main equipment (RF couplers, helium vessels, tuners, magnetic shielding) inside the cryo-module and their assembly method. The operational scenarios and test plans are also presented and discussed.

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.

Paper

Title

Page

Conceptual Design of the Superconducting Proton Linac (SPL) Short Cryo-module

43

V. Parma, P. Bestman, N. Bourcey, O. Capatina, P. Coelho Moreira de Azevedo, E. Montesinos, T. Renaglia, A. Vande Crean, W. Weingarten, L.R. Williams
CERN, Geneva, Switzerland
P. Dambre, P. Duchesne, P. Duthil, D. Reynet, S. Rousselot
IPN, Orsay, France

Funding: With contribution from EuCARD, Grant Agreement No:227579
The Superconducting Proton Linac (SPL) is an R&D effort conducted by CERN in partnership with other international laboratories, aimed at developing key technologies for the construction of a multi-megawatt proton linac based on state-of-the-art SRF technology, which would serve as a driver for new physics facilities such as neutrinos and radioactive ion beams. Amongst the main objectives of this effort, are the development of 704 MHz bulk niobium β=1 elliptical cavities, operating at 2 K and providing an accelerating field of 25 MV/m, and testing of a string of cavities integrated in a machine-type cryo-module. In an initial phase only 4 out of the 8 cavities of an SPL cryo-module will be tested in a ½ length cryo-module developed for this purpose thus called the Short Cryo-module. This paper presents the conceptual design of the Short Cryo-module, highlighting its innovative principles in terms of cavity supporting and alignment, and describes the integration of cavities and their main equipment (RF couplers, helium vessels, tuners, magnetic shielding) inside the cryo-module and their assembly method. The operational scenarios and test plans are also presented and discussed.

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.