Paper |
Title |
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TUOBC03 |
Experimental Measurements of e-Cloud Mitigation using Clearing Electrodes in the DAΦNE Collider |
1107 |
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- D. Alesini, T. Demma, A. Drago, A. Gallo, S. Guiducci, C. Milardi, P. Raimondi, M. Zobov
INFN/LNF, Frascati (Roma), Italy
- S. De Santis
LBNL, Berkeley, California, USA
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Recently the electron-positron collider DAΦNE has started delivering luminosity to the KLOE-2 experiment. For this run special metallic electrodes for e-cloud clearing were installed in all the dipole and wiggler magnets of the collider positron ring. Experimental measurements of the effectiveness of the electrodes in the mitigation of the e-cloud effects in the positron beam have been done showing an impressive effectiveness of these devices in the cure of the e-cloud effects in the positron beam. In particular the electrodes allow reducing the vertical beam size increase, the growth rate of transverse instabilities and the tune shifts induced by the electron cloud. Frequency shifts measurements of the vacuum chamber resonances switching on and off the electrodes have also been done showing their effect in the reduction of the electron cloud density. In this paper we summarize the results of all our observations and the experimental measurements of the e-cloud suppression with these electrodes.
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Slides TUOBC03 [2.825 MB]
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TUOBB01 |
A European Proposal for the Compton Gamma-ray Source of ELI-NP |
1086 |
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- L. Serafini, I. Boscolo, F. Broggi, V. Petrillo
Istituto Nazionale di Fisica Nucleare, Milano, Italy
- O. Adriani, G. Graziani, G. Passaleva
INFN-FI, Sesto Fiorentino, Italy
- S. Albergo, A. Tricomi
INFN-CT, Catania, Italy
- D. Alesini, M.P. Anania, A. Bacci, R. Bedogni, M. Bellaveglia, C. Biscari, R. Boni, M. Boscolo, M. Castellano, E. Chiadroni, A. Clozza, E. Di Pasquale, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, A. Gallo, G. Gatti, A. Ghigo, F. Marcellini, C. Maroli, G. Mazzitelli, E. Pace, L. Pellegrino, R. Ricci, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, P. Tomassini, C. Vaccarezza, S. Vescovi, F. Villa
INFN/LNF, Frascati (Roma), Italy
- D. Angal-Kalinin, J.A. Clarke, B.D. Fell, A.R. Goulden, J.D. Herbert, S.P. Jamison, P.A. McIntosh, R.J. Smith, S.L. Smith
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- P. Antici, M. Coppola, L. Lancia, A. Mostacci, L. Palumbo
URLS, Rome, Italy
- N. Bliss, B.G. Martlew
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
- P. Cardarelli, M. Gambaccini
INFN-Ferrara, Ferrara, Italy
- L. Catani, A. Cianchi
INFN-Roma II, Roma, Italy
- I. Chaikovska, O. Dadoun, A. Stocchi, A. Variola, Z.F. Zomer
LAL, Orsay, France
- C. De Martinis
INFN/LASA, Segrate (MI), Italy
- F. Druon, P. Fichot
ILE, Palaiseau Cedex, France
- E. Iarocci
University of Rome "La Sapienza", Rome, Italy
- M. Migliorati
Rome University La Sapienza, Roma, Italy
- A.-S. Müller
IN2P3, Paris, France
- V. Nardone
Università di Roma I La Sapienza, Roma, Italy
- C. Ronsivalle
ENEA C.R. Frascati, Frascati (Roma), Italy
- M. Veltri
Uniurb, Urbino (PU), Italy
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A European proposal is under preparation for the Compton gamma-ray Source of ELI-NP. In the Romanian pillar of ELI (the European Extreme Light Infrastructure) an advanced gamma-ray beam is foreseen, coupled to two 10 PW laser systems. The photons will be generated by Compton back-scattering in the collision between a high quality electron beam and a high power laser. A European collaboration formed by INFN, Univ. of Roma La Sapienza, Orsay-LAL of IN2P3, Univ. de Paris Sud XI and ASTeC at Daresbury, is preparing a TDR exploring the feasibility of a machine expected to achieve the Gamma-ray beam specifications: energy tunable between 1 and 20 MeV, narrow bandwidth (0.3%) and high spectral density, 104 photons/sec/eV. We will describe the lay-out of the 720 MeV RF Linac and the collision laser with the associated optical cavity, as well as the optimized beam dynamics to achieve maximum phase space density at the collision, taking into account beam loading and beam break-up due to the acceleration of long bunch trains. The predicted gamma-ray spectra will be evaluated as the gamma photons collimators background. An option for electron bunches recirculation will also be illustrated.
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Slides TUOBB01 [5.099 MB]
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WEPPP017 |
Recent Results at the SPARCLAB Facility |
2758 |
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- M. Ferrario, D. Alesini, M.P. Anania, M. Bellaveglia, R. Boni, M. Castellano, E. Chiadroni, G. Di Pirro, A. Drago, A. Esposito, A. Gallo, C. Gatti, G. Gatti, A. Ghigo, T. Levato, E. Pace, L. Pellegrino, R. Pompili, A.R. Rossi, B. Spataro, P. Tomassini, C. Vaccarezza, F. Villa
INFN/LNF, Frascati (Roma), Italy
- A. Bacci, C. De Martinis, L. Serafini
Istituto Nazionale di Fisica Nucleare, Milano, Italy
- A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
- G. Dattoli, E. Di Palma, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, I.P. Spassovsky, V. Surrenti
ENEA C.R. Frascati, Frascati (Roma), Italy
- D. Di Giovenale
INFN-Roma II, Roma, Italy
- U. Dosselli
INFN, Roma, Italy
- R. Faccini
INFN-Roma, Roma, Italy
- R. Fedele
Naples University Federico II, Mathematical, Physical and Natural Sciences Faculty, Napoli, Italy
- M. Gambaccini
INFN-Ferrara, Ferrara, Italy
- D. Giulietti
UNIPI, Pisa, Italy
- L.A. Gizzi, L. Labate
CNR/IPP, Pisa, Italy
- P. Londrillo
INFN-Bologna, Bologna, Italy
- S. Lupi
Università di Roma I La Sapienza, Roma, Italy
- A. Mostacci, L. Palumbo
Rome University La Sapienza, Roma, Italy
- G. Passaleva
INFN-FI, Sesto Fiorentino, Italy
- V. Petrillo
Universita' degli Studi di Milano, Milano, Italy
- J.V. Rau
ISM-CNR, Rome, Italy
- G. Turchetti
Bologna University, Bologna, Italy
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A new facility named SPARCLAB (Sources for Plasma Accelerators and Radiation Compton with Lasers and Beams) has been recently launched at the INFN National Labs in Frascati, merging the potentialities of the old projects SPARC and PLASMONX. The SPARC project, a collaboration among INFN, ENEA and CNR, is now completed, hosting a 150 MeV high brightness electron beam injector which feeds a 12 meters long undulator. Observation of FEL radiation in the SASE, Seeded and HHG modes has been performed from 500 nm down to 40 nm wevelength. A second beam line has been also installed to drive a narrow band THz radiation source. In parallel to that, INFN decided to host a 300 TW laser that will be linked to the linac and devoted to explore laser-matter interaction, in particular with regard to laser-plasma acceleration in the self injection and external injection modes, (the PLASMONX experiments). The facility will be also used for particle driven plasma acceleration experiments (the COMB experiment). A Thomson scattering experiment coupling the electron bunch to the high-power laser to generate coherent monochromatic X-ray radiation is also in the commissioning phase.
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