Search

Your search keyword '"Caspers F"' showing total 74 results
Start Over Author "Caspers F" Publisher ieee
74 results on '"Caspers F"'

2. Bench measurements of low frequency transverse impedance

Author

Andrea Mostacci, Caspers, F., Vos, L., and Iriso, U.

Subjects
Physics, Nuclear magnetic resonance, Transmission line, Acoustics, Damping factor, Impedance matching, Physics::Accelerator Physics, Wave impedance, Quarter-wave impedance transformer, Input impedance, Electrical impedance, Characteristic impedance
Abstract

For frequencies below 10 MHz the classical two wire transmission line method is subject to difficulties in sensitivity and measurement uncertainties. Thus for evaluation of the low frequency transverse impedance properties of the LHC dump kicker a modified version of the two wire transmission line has been used. It consists, in the present case, of a 10 turn loop of approximately 1 meter length and 2 cm width. The change of input impedance of the loop is measured as a function of the surroundings and by using a proper reference (metallic beam pipe) these changes are converted into a meaningful transverse beam coupling impedance. Measurements of several calibration objects have shown close agreement with theoretical results.

Published
2004
Full Text
View/download PDF

3. Ferrite Characterization for the Design of an Accelerating Cavity With Perpendicular Biasing.

Author

Eberhardt, J., Caspers, F., and Vollinger, C.

Subjects
*FERRITES, *CAVITY resonators, *TOROIDAL magnetic circuits, *CYCLOTRONS, *PERMEABILITY measurement, *QUALITY factor meters
Abstract

A perpendicular biased ferrite loaded accelerating cavity is studied for a possible upgrade of the CERN accelerator complex which could help to overcome the intensity limitations occurring at the SPS injection. The required accelerating cavity should cover a frequency range of 18 to 40 MHz with high cavity Q, which poses high demands on the ferrite material properties. A test setup is presented to measure the relative permeability and magnetic losses of full scale ferrite garnets (350 mm outer and 200 mm inner diameter) in a magnetic bias field within the frequency range of interest. An one-port reflection measurement provides adequate input to model the relative permeability of the ferrite in numerical simulations for different magnetic bias fields. A resonant measurement setup was used to cross-check simulation results with measurement data and to investigate the magnetic losses of the ferrite material. A numerical model of a simplified accelerating cavity is used to study the capability of the garnet G-510 as a perpendicular biased tuning ferrite. [ABSTRACT FROM PUBLISHER]

Published
2016
Full Text
View/download PDF

4. Tests of a Roman pot prototype for the totem experiment

Author

Deile, M, Alagoz, E, Anelli, G, Antchev, G, Ayache, M, Caspers, F, Dimovasili, E, Dinapoli, R, Drouhin, F, Eggert, K, Escourrou, J L, Fochler, O, Gill, K, Grabit, R, Haug, F, Jarron, P, Kaplon, J, Kroyer, T, Luntama, T, Macina, D, Mattelon, E, Niewiadomski, H, Mirabito, L, Noschis, E P, Oriunno, M, Park, A, Perrot, A L, Pirotte, O, Quetsch, J M, Regnier, F, Ruggiero, G, Saramad, S, Siegrist, P, Snoeys, W, Souissi, T, Szczygiel, R, Troska, J, Vasey, F, Verdier, A, Da Via, C, Hasi, J, Kok, A, Watts, S, Kaspar, J, Kundrat, V, Lokajicek, M V, Smotlacha, J, Avati, V, Jarvinen, M, Kalliokoski, M, Kalliopuska, J, Kurvinen, K, Lauhakangas, R, Oljemark, F, Orava, R, Osterberg, K, Palmieri, V, Saarikko, H, Soininen, A, Boccone, V, Bozzo, M, Buzzo, A, Cuneo, S, Ferro, F, Macri, M, Minutoli, S, Morelli, A, Musico, P, Negri, M, Santroni, A, Sette, G, Sobol, A, Berardi, V, Catanesi, M G, Radicioni, E, Deile, M, Alagoz, E, Anelli, G, Antchev, G, Ayache, M, Caspers, F, Dimovasili, E, Dinapoli, R, Drouhin, F, Eggert, K, Escourrou, J L, Fochler, O, Gill, K, Grabit, R, Haug, F, Jarron, P, Kaplon, J, Kroyer, T, Luntama, T, Macina, D, Mattelon, E, Niewiadomski, H, Mirabito, L, Noschis, E P, Oriunno, M, Park, A, Perrot, A L, Pirotte, O, Quetsch, J M, Regnier, F, Ruggiero, G, Saramad, S, Siegrist, P, Snoeys, W, Souissi, T, Szczygiel, R, Troska, J, Vasey, F, Verdier, A, Da Via, C, Hasi, J, Kok, A, Watts, S, Kaspar, J, Kundrat, V, Lokajicek, M V, Smotlacha, J, Avati, V, Jarvinen, M, Kalliokoski, M, Kalliopuska, J, Kurvinen, K, Lauhakangas, R, Oljemark, F, Orava, R, Osterberg, K, Palmieri, V, Saarikko, H, Soininen, A, Boccone, V, Bozzo, M, Buzzo, A, Cuneo, S, Ferro, F, Macri, M, Minutoli, S, Morelli, A, Musico, P, Negri, M, Santroni, A, Sette, G, Sobol, A, Berardi, V, Catanesi, M G, and Radicioni, E

Abstract

The TOTEM collaboration has developed and tested the first prototype of its Roman Pots to be operated in the LHC. TOTEM Roman Pots contain stacks of silicon detectors with strips oriented in two orthogonal directions. To measure proton scattering angles of a few microradians, the detectors will approach the beam centre to a distance of 10 sigma + 0.5 mm (= 1.3 mm). Dead space near the detector edge is minimised by using two novel "edgeless" detector technologies. The silicon detectors are used both for precise track reconstruction and for triggering. The first full-sized prototypes of both detector technologies as well as their read-out electronics have been developed, built and operated. The tests took place in the proton beam-line of the SPS accelerator ring. In addition, the pot's shielding against electromagnetic interference and the longitudinal beam coupling impedance have been measured with the wire method.

Published
2005

9. Transverse impendance of LHC collimators

Author

Metral, E., primary, Arduini, G., additional, Assmann, R., additional, Boccardi, A., additional, Bohl, T., additional, Caspers, F., additional, Gasior, M., additional, Jones, O.R., additional, Kasinski, K.K., additional, Kroyer, T., additional, Redaelli, S., additional, Robert-Demolaize, G., additional, Rumolo, G., additional, Steinhagen, R., additional, Weiler, T., additional, Zimmermann, F., additional, Bracco, C., additional, Salvant, B., additional, and Roncarolo, F., additional

Published
2007
Full Text
View/download PDF

12. Electron cloud and beam scrubbing in the LHC

Author

Bruning, O., primary, Caspers, F., additional, Collins, I.R., additional, Grobner, O., additional, Henrist, B., additional, Hilleret, N., additional, Laurent, J.-M., additional, Morvillo, M., additional, Pivi, M., additional, Ruggiero, F., additional, and Zhang, X., additional

Published
1999
Full Text
View/download PDF

13. The Effect of 2-Directional Magnetic Biasing Used for Tuning of a Ferrite-Loaded Re-entrant Cavity.

Author

Vollinger, C., Caspers, F., and Jensen, E.

Subjects
*HOLES, *FERRITES, *RESONANCE, *MAGNETIC fields, *ELECTROMAGNETIC theory
Abstract

Cavities that are partially filled with ferrite material provide a tunable resonance frequency by making use of the changing \mu-characteristics of ferrites when exposed to an external magnetic bias field. The concept of using either parallel or perpendicular magnetic biasing to reach a certain resonance frequency of a cavity has been known for many years. However, a cavity based on superposition of perpendicular and parallel magnetic fields to obtain improved ferrite characteristics was suggested in W. R. Smythe “Reducing ferrite tuner power loss by bias field rotation,” IEEE Trans. Nucl. Sci., vol. 30, no. 4, pp. 273–275, 1983, but to our knowledge was neither tested nor built. Such a 2-directional biasing is expected to provide a reduction in RF losses for an identical tuning range as compared with the classical 1-directional magnetic bias. We have successfully tested this theory with a measurement set-up consisting of a ferrite-filled cavity, exposed to external biases that allow the clear separation of the two orientations of superposed magnetic bias fields. The outcome is an enlargement of tuning range with high cavity Q and the possibility of fast tuning. In this paper, we describe the measurement set-up and present the tuning ranges that we attained by applying different bias schemes. [ABSTRACT FROM PUBLISHER]

Published
2013
Full Text
View/download PDF

14. Metrological Performance of a Ferrimagnetic Resonance Marker for the Field Control of the CERN Proton Synchrotron.

Author

Arpaia, P., Buzio, M., Caspers, F., Golluccio, G., and Oberson, D.

Subjects
FERRIMAGNETIC materials, MAGNETIC fields, ACCELERATOR magnets, TRANSDUCERS
Abstract

In particle accelerators, “field markers” provide a digital trigger when the magnetic field crosses a given threshold. In this paper, the metrological characterization of a magnetic field marker, based on a ferrimagnetic resonance transducer referencing the flux sensed by a coil, is reported. The experimental results of a validation test campaign at the European Organization for Nuclear Research (CERN) to test the marker in static as well as fast ramping fields (up to 2.5 T/s) are illustrated. The repeatability of \pm 4\ \muT attained in the range (60 to 100) mT is very promising to increase the performance of the Proton Synchrotron accelerator at CERN. [ABSTRACT FROM PUBLISHER]

Published
2012
Full Text
View/download PDF

22. Tests of A Roman Pot Prototype for the Totem Experiment.

Author

Deile, M., Alagoz, E., Anelli, G., Antchev, G., Ayache, M., Caspers, F., Dimovasili, E., Dinapoli, R., Drouhin, F., Eggert, K., Escourrou, J.L., Fochler, O., Gill, K., Grabit, R., Haug, F., Jarron, P., Kaplon, J., Kroyer, T., Luntama, T., and Macina, D.

Published
2005
Full Text
View/download PDF

27. Multipactor in a Coaxial Line Under the Presence of an Axial DC Magnetic Field.

Author

Gonzalez-Iglesias, D., Perez, A. M., Anza, S., Vague, J., Gimeno, B., Boria, V. E., Raboso, D., Vicente, C., Gil, J., Caspers, F., and Conde, L.

Subjects
MAGNETIC fields, RADIO frequency, ELECTRIC lines, ELECTRICAL conductors, ELECTRIC discharges, DIRECT currents, WAVEGUIDES
Abstract

The main goal of this letter is the analysis of the multipactor effect within a coaxial waveguide structure when an external axial dc magnetic field is applied. We have designed and manufactured a coaxial waveguide sample that has been immersed within a long solenoid. Numerical and experimental results confirm a significant change in the RF breakdown behavior with regard to the case without the axial dc magnetic field, as well as the existence of single- and double-surface multipactor regimes. Good agreement between theory and experimental data has been found. [ABSTRACT FROM PUBLISHER]

Published
2012
Full Text
View/download PDF

36. The antiproton decelerator: AD

Author

Baird, S., primary, Berlin, D., additional, Boillot, J., additional, Bosser, J., additional, Brouet, M., additional, Buttkus, J., additional, Caspers, F., additional, Chohan, V., additional, Dekkers, D., additional, Eriksson, T., additional, Garoby, R., additional, Giannini, R., additional, Grobner, O., additional, Gruber, J., additional, Hemery, J.Y., additional, Koziol, H., additional, Maccaferri, R., additional, Maury, S., additional, Metzger, C., additional, Metzmacher, K., additional, Mohl, D., additional, Mulder, H., additional, Paoluzzi, M., additional, Pedersen, F., additional, Riunaud, J.P., additional, Serre, C., additional, Simon, D.J., additional, Tranquille, G., additional, Tuyn, J., additional, and Van der Schueren, A., additional

Full Text
View/download PDF

38. LHC Collimation: Design and Results from Prototyping and Beam Tests

Author

Assmann, R., primary, Aberle, O., additional, Arduini, G., additional, Bertarelli, A., additional, Braun, H., additional, Brugger, M., additional, Burkhardt, H., additional, Calatroni, S., additional, Caspers, F., additional, Chiaveri, E., additional, Dallochio, A., additional, Dehning, B., additional, Ferrari, A., additional, Gasior, M., additional, Grudiev, A., additional, Holzer, E.B., additional, Jeanneret, J.B., additional, Jimenez, J.M., additional, Kadi, Y., additional, Losito, R., additional, Magistris, M., additional, Masi, A., additional, Mayer, M., additional, Metral, E., additional, Perret, R., additional, Rathjen, C., additional, Redaelli, S., additional, Robert-Demolaize, G., additional, Roesler, S., additional, Santana, M., additional, Schulte, D., additional, Sievers, P., additional, Tsoulou, K., additional, Vincke, H., additional, Vlachoudis, V., additional, Wenninger, J., additional, Baishev, I., additional, Kurochkin, I., additional, and Spiezia, G., additional

Full Text
View/download PDF

41. The Large Hadron Collider vacuum system

Author

Angerth, B., primary, Bertinelli, F., additional, Brunet, J.-C., additional, Calder, R., additional, Caspers, F., additional, Cruikshank, P., additional, Dalin, J.-M., additional, Grobner, O., additional, Kos, N., additional, Mathewson, A., additional, Poncet, A., additional, Reymermier, C., additional, Ruggiero, F., additional, Sholz, T., additional, Sgobba, S., additional, and Wallen, E., additional

Full Text
View/download PDF

47. Commissioning and first operation of the Antiproton Decelerator (AD)

Author

Belochitskii, P., primary, Bosser, J., additional, Buttkus, J., additional, Carli, C., additional, Caspers, F., additional, Chohan, V., additional, Cornuet, D., additional, Eriksson, T., additional, Findlay, A., additional, Giovannozzi, M., additional, Holzer, B., additional, Maccaferri, R., additional, Madsen, N., additional, Marchesotti, M., additional, Maury, S., additional, Mohl, D., additional, Pasinelli, S., additional, Pedersen, F., additional, Soby, L., additional, and Tranquille, G., additional

Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results