IPAC2012 - List of Authors (Riddone, G.)

Paper

Title

Page

A Multi Purpose X Band Accelerating Structure

70

M.M. Dehler, A. Citterio, R. Zennaro
Paul Scherrer Institut, Villigen, Switzerland
G. D'Auria, C. Serpico
ELETTRA, Basovizza, Italy
D. Gudkov, A. Samoshkin
JINR, Dubna, Moscow Region, Russia
S. Lebet, G. Riddone, J. Shi
CERN, Geneva, Switzerland

In a collaboration between CERN, PSI and Sincrotrone Trieste (ST), a series of four multipurpose X-band accelerating structures has been designed and fabricated. The structures have 72 cells with a phase advance of 5 pi/6 and include upstream and downstream wakefield monitors to measure the beam alignment. We give an overview of the electrical and mechanical design and describe the fabrication of the first units. We also present the results of the low level RF tests. Using measurements of the internal cell to cell misalignment, the residual transverse wake and the noise floor of the wake field monitors are computed. Furthermore, we present the first experiences running the structures under high power.

Slides MOOBC03 [15.521 MB]

TUPPR033

Improved Modelling of the Thermo-mechanical Behavior of the CLIC Two-Beam Module

1891

G. Riddone, T.O. Niinikoski, F. Rossi
CERN, Geneva, Switzerland
R.J. Raatikainen, K. Österberg
HIP, University of Helsinki, Finland
A. Samoshkin
JINR, Dubna, Moscow Region, Russia

The luminosity goal of the CLIC collider, currently under study, imposes micrometer mechanical stability of the 2-m-long two-beam modules, the shortest repetitive elements of the main linacs. These modules will be exposed to variable high power dissipation during operation resulting in mechanical distortions in and between module components. The stability of the CLIC module is being tested in laboratory conditions at CERN in a full-scale prototype module. In this paper, the revised finite element model developed for the CLIC two-beam module is described. In the current model, the structural behavior of the module is studied in more detail compared to the earlier configurations, in particular for what regards the contact modeling. The thermal and structural results for the module are presented considering the thermo-mechanical behavior of the CLIC collider in its primary operation modes. These results will be compared to the laboratory measurements to be done in 2012 with the full-scale prototype module. The experimental results will allow for better understanding of the module behavior and they will be propagated back to the present thermo-mechanical model.

THPPC060

Commissioning of the First Klystron-based X-band Power Source at CERN

3428

J.W. Kovermann, N. Catalan-Lasheras, S. Curt, S. Döbert, G. McMonagle, S.F. Rey, G. Riddone, K.M. Schirm, I. Syratchev, L. Timeo
CERN, Geneva, Switzerland
J.P. Eichner, A.A. Haase, D.W. Sprehn
SLAC, Menlo Park, California, USA
A. Hamdi, F. Peauger
CEA/DSM/IRFU, France

A new klystron based x-band rf power source working at 11.994GHz has been installed and commissioned at CERN in collaboration with CEA Saclay and SLAC for CLIC accelerating structure tests. The system comprises a solid state high voltage modulator, an XL5 klystron developed by SLAC, a cavity based SLED type pulse compressor, the necessary low level rf system including rf diagnostics and interlocks and the surrounding vacuum, cooling and controls infrastructure. The klystron can produce up to 50MW rf pulses of 1500ns pulse width and 50Hz repetition rate. After pulse compression, up to 100MW of rf power at 250ns pulse with are available in the structure test bunker. This paper describes in more detail this setup and the results of the commissioning which was necessary to arrive at the mentioned performance.

Paper	Title	Page
MOOBC03	A Multi Purpose X Band Accelerating Structure	70
	M.M. Dehler, A. Citterio, R. Zennaro Paul Scherrer Institut, Villigen, Switzerland G. D'Auria, C. Serpico ELETTRA, Basovizza, Italy D. Gudkov, A. Samoshkin JINR, Dubna, Moscow Region, Russia S. Lebet, G. Riddone, J. Shi CERN, Geneva, Switzerland
	In a collaboration between CERN, PSI and Sincrotrone Trieste (ST), a series of four multipurpose X-band accelerating structures has been designed and fabricated. The structures have 72 cells with a phase advance of 5 pi/6 and include upstream and downstream wakefield monitors to measure the beam alignment. We give an overview of the electrical and mechanical design and describe the fabrication of the first units. We also present the results of the low level RF tests. Using measurements of the internal cell to cell misalignment, the residual transverse wake and the noise floor of the wake field monitors are computed. Furthermore, we present the first experiences running the structures under high power.
	Slides MOOBC03 [15.521 MB]

TUPPR033	Improved Modelling of the Thermo-mechanical Behavior of the CLIC Two-Beam Module	1891
	G. Riddone, T.O. Niinikoski, F. Rossi CERN, Geneva, Switzerland R.J. Raatikainen, K. Österberg HIP, University of Helsinki, Finland A. Samoshkin JINR, Dubna, Moscow Region, Russia
	The luminosity goal of the CLIC collider, currently under study, imposes micrometer mechanical stability of the 2-m-long two-beam modules, the shortest repetitive elements of the main linacs. These modules will be exposed to variable high power dissipation during operation resulting in mechanical distortions in and between module components. The stability of the CLIC module is being tested in laboratory conditions at CERN in a full-scale prototype module. In this paper, the revised finite element model developed for the CLIC two-beam module is described. In the current model, the structural behavior of the module is studied in more detail compared to the earlier configurations, in particular for what regards the contact modeling. The thermal and structural results for the module are presented considering the thermo-mechanical behavior of the CLIC collider in its primary operation modes. These results will be compared to the laboratory measurements to be done in 2012 with the full-scale prototype module. The experimental results will allow for better understanding of the module behavior and they will be propagated back to the present thermo-mechanical model.

THPPC060	Commissioning of the First Klystron-based X-band Power Source at CERN	3428
	J.W. Kovermann, N. Catalan-Lasheras, S. Curt, S. Döbert, G. McMonagle, S.F. Rey, G. Riddone, K.M. Schirm, I. Syratchev, L. Timeo CERN, Geneva, Switzerland J.P. Eichner, A.A. Haase, D.W. Sprehn SLAC, Menlo Park, California, USA A. Hamdi, F. Peauger CEA/DSM/IRFU, France
	A new klystron based x-band rf power source working at 11.994GHz has been installed and commissioned at CERN in collaboration with CEA Saclay and SLAC for CLIC accelerating structure tests. The system comprises a solid state high voltage modulator, an XL5 klystron developed by SLAC, a cavity based SLED type pulse compressor, the necessary low level rf system including rf diagnostics and interlocks and the surrounding vacuum, cooling and controls infrastructure. The klystron can produce up to 50MW rf pulses of 1500ns pulse width and 50Hz repetition rate. After pulse compression, up to 100MW of rf power at 250ns pulse with are available in the structure test bunker. This paper describes in more detail this setup and the results of the commissioning which was necessary to arrive at the mentioned performance.