J.M. Jimenez
CERN
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Featured researches published by J.M. Jimenez.
ieee particle accelerator conference | 2007
Fritz Caspers; J.M. Jimenez; Owain Rhodri Jones; T. Kroyer; Christophe Vuitton; Timothy W. Hamerla; Andreas Jansson; Joel Misek; Ralph J. Pasquinelli; Peter Seifrid; D. Sun; David Tinsley
The LHC Schottky observation system is based on traveling wave type high sensitivity pickup structures operating at 4.8 GHz. The choice of the structure and operating frequency is driven by the demanding LHC impedance requirements, where very low impedance is required below 2 GHz, and good sensitivity at the selected band at 4.8 GHz. A sophisticated filtering and triple down-mixing signal processing chain has been designed and implemented in order to achieve the specified 100 dB instantaneous dynamic range without range switching. Detailed design aspects for the complete systems and test results without beam are presented and discussed.
Proceedings of the 2005 Particle Accelerator Conference | 2005
Daniel Schulte; G. Arduini; V. Baglin; J.M. Jimenez; Francesco Ruggiero; F. Zimmermann
Novel measurements of the electron cloud have been performed in the SPS in 2004. The LHC beam in the SPS consists of a number of short bunch trains. By varying the distance between these trains it is possible to test the survival of the electrons after the bunch passage. In this paper, results from simulations and experiments are compared.
Proceedings of the 2003 Particle Accelerator Conference | 2003
J.M. Jimenez; Q. Arduini; V. Baglin; P. Collier; G. Ferioli; B. Henrist; N. Hilleret; L. Jensen; B. Jenninger; Jean Michel Laurent; A. Rossi; K. Weiss; F. Zimmermann
A summary of the main results obtained so far from the electron cloud studies using strip detectors, pick-ups, COLDEX and a 100 MHz coaxial resonator will be presented. The spatial and energy distributions of the electrons in the cloud measured by the strip detectors will be detailed and compared to the results obtained with a conventional retarding field detector. The evidence of the scrubbing effect and of the NEG coatings as remedies to reduce the electron cloud activity will also be shown. In a second part, the improved hardware of the experiments will be presented together with the program of measurements foreseen for the 2003 SPS run.
Vacuum | 1999
J.M. Jimenez; J.L. Dorier; N. Hilleret
A large area (50 cm(2)) particle counter working under vacuum (10(-7) mbar) has been developed at CERN and applied to measurements of particles released by several vacuum components like valves, gauges and ion pumps. This technique has also been applied to study the migration of particles under vacuum with and without an applied electric field. This counter, which is based on the scattering of laser light by particles, is described with comments on the technical choices. The results of the contamination released by vacuum components and the effects of an electric field will be presented
Archive | 2002
P. Collier; M Ainoux; J.M. Jimenez; A Rizzo; K. Weiss; Alan Spinks; R Guinand
Vacuum | 2009
J.M. Jimenez
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268) | 2001
G. Arduini; J.M. Jimenez; K. Weiss
Vacuum | 2012
Giuseppe Bregliozzi; G. Lanza; Vincent Baglin; J.M. Jimenez
Archive | 2002
Gianluigi Arduini; F. Zimmermann; L. Jensen; J.M. Jimenez; B. Dehning; G. Rumolo; B. Henrist; P. Collier; K. Weiss; G. Ferioli; Jean Michel Laurent
Conf. Proc. | 2012
G. Lanza; Vincent Baglin; Giuseppe Bregliozzi; J.M. Jimenez
