| Paper |
Title |
Page |
| MOPKF042 |
Status of the SPARC Project
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399 |
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- M. Ferrario, D. Alesini, M. Bellaveglia, S. Bertolucci, M.E. Biagini, R. Boni, M. Boscolo, M. Castellano, A. Clozza, G. Di Pirro, A. Drago, A. Esposito, D. Filippetto, V. Fusco, A. Gallo, A. Ghigo, S. Guiducci, M. Incurvati, C. Ligi, F. Marcellini, L. Pellegrino, M.A. Preger, R. Ricci, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, F. Tazzioli, C. Vaccarezza, M. Vescovi, C. Vicario
INFN/LNF, Frascati (Roma)
- F. Alessandria, A. Bacci, M. Mauri
INFN/LASA, Segrate (MI)
- I. Boscolo, F. Brogli, S. Cialdi, C. De Martinis, D. Giove, C. Maroli, V. Petrillo, M. Romé, L. Serafini
INFN-Milano, Milano
- L. Catani, E.C. Chiadroni, A. Cianchi, S. Tazzari
Università di Roma II Tor Vergata, Roma
- F. Ciocci, G. Dattoli, A. Doria, F. Flora, G.P. Gallerano, L. Giannessi, E. Giovenale, G. Messina, L. Mezi, P.L. Ottaviani, L. Picardi, M. Quattromini, A. Renieri, C. Ronsivalle
ENEA C.R. Frascati, Frascati (Roma)
- D. Dowell, P. Emma, C. Limborg-Deprey, D. Palmer
SLAC, Menlo Park, California
- D. Levi, M. Mattioli, G. Medici
Università di Roma I La Sapienza, Roma
- M. Migliorati, A. Mostacci, L. Palumbo
Rome University La Sapienza, Roma
- P. Musumeci, J. Rosenzweig
UCLA, Los Angeles, California
- M. Nisoli, S. Stagira, S. de Silvestri
Politecnico/Milano, Milano
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The aim of the SPARC project is to promote an R&D activity oriented to the development of a high brightness photoinjector to drive SASE-FEL experiments at 500 nm and higher harmonics generation. It has been proposed by a collaboration among ENEA-INFN-CNR-Universita‘ di Roma Tor Vergata-INFM-ST and funded by the Italian Government with a 3 year time schedule. The machine will be installed at LNF, inside an existing underground bunker. It is comprised of an rf gun driven by a Ti:Sa laser to produce 10-ps flat top pulses on the photocathode, injecting into three SLAC accelerating sections. We foresee conducting investigations on the emittance correction and on the rf compression techniques up to kA level. The SPARC photoinjector can be used also to investigate beam physics issues like surface-roughness-induced wake fields, bunch-length measurements in the sub-ps range, emittance degradation in magnetic compressors due to CSR. We present in this paper the status of the design activities of the injector and of the undulator. The first test on diagnostic prototypes and the first experimental achievements of the flat top laser pulse production are also discussed.
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| TUPKF025 |
Superconducting Niobium Film for RF Applications
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1021 |
| |
- A. Cianchi, L. Catani, A. Cianchi, S. Tazzari
INFN-Roma II, Roma
- Y.H. Akhmadeev
Institute of High Current Electronics, Tomsk
- A. Andreone, G. Cifariello, E. Di Gennaro, G. Lamura
Naples University Federico II, Napoli
- J.L. Langner
The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
- R.R. Russo
Università di Roma II Tor Vergata, Roma
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Thin niobium film coated copper RF cavities are an interesting possible alternative to bulk-Nb cavities since copper is much cheaper than niobium, it has higher thermal conductivity and a better mechanical stability. Unfortunately, the observed degradation of the quality factor with increased cavity voltage of sputtered accelerating cavities restricts their usage in future large linear accelerators needing gradients higher than 15MV/m. We are developing an alternate deposition technology, based on a cathodic arc system working in UHV conditions. Its main advantages compared to standard sputtering are the ionized state of the evaporated material, the absence of gases to sustain the discharge, the much higher energy of atoms reaching the substrate surface and the possibility of higher deposition rates. To ignite the arc we use a Nd-YAG pulsed laser focused on the cathode surface that provides a reliable and ultraclean trigger. Recent results on the characterization of niobium film samples produced under different conditions are presented showing that the technique can produce bulk-like films suitable for RF superconducting applications.
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| TUPKF025 |
Superconducting Niobium Film for RF Applications
|
1021 |
| |
- A. Cianchi, L. Catani, A. Cianchi, S. Tazzari
INFN-Roma II, Roma
- Y.H. Akhmadeev
Institute of High Current Electronics, Tomsk
- A. Andreone, G. Cifariello, E. Di Gennaro, G. Lamura
Naples University Federico II, Napoli
- J.L. Langner
The Andrzej Soltan Institute for Nuclear Studies, Centre Swierk, Swierk/Otwock
- R.R. Russo
Università di Roma II Tor Vergata, Roma
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Thin niobium film coated copper RF cavities are an interesting possible alternative to bulk-Nb cavities since copper is much cheaper than niobium, it has higher thermal conductivity and a better mechanical stability. Unfortunately, the observed degradation of the quality factor with increased cavity voltage of sputtered accelerating cavities restricts their usage in future large linear accelerators needing gradients higher than 15MV/m. We are developing an alternate deposition technology, based on a cathodic arc system working in UHV conditions. Its main advantages compared to standard sputtering are the ionized state of the evaporated material, the absence of gases to sustain the discharge, the much higher energy of atoms reaching the substrate surface and the possibility of higher deposition rates. To ignite the arc we use a Nd-YAG pulsed laser focused on the cathode surface that provides a reliable and ultraclean trigger. Recent results on the characterization of niobium film samples produced under different conditions are presented showing that the technique can produce bulk-like films suitable for RF superconducting applications.
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| THPLT058 |
Commissioning of the OTR Beam Profile Monitor System at TTF/VUV-FEL Injector
|
2616 |
| |
- A. Cianchi, L. Catani, E.C. Chiadroni
INFN-Roma II, Roma
- M. Castellano, G. Di Pirro
INFN/LNF, Frascati (Roma)
- K. Honkavaara
DESY, Hamburg
- M. Raparelli
Università di Roma II Tor Vergata, Roma
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The TESLA Test Facility (TTF) linac at DESY is being extended to an energy of 1 GeV to drive a new Free Electron Laser facility (VUV-FEL)with wavelengths between 100 nm and 6 nm.Beam profile monitors based on optical transition radiation (OTR) are one of the most important electron beam diagnostics tools. The OTR imaging system is designed to measure the transverse beam size and shape with a resolution down to 10 um. The images are digitized by CCD cameras. A network structure allows a simpler topology to connect the large number of cameras (24).This paper considers the commissioning of the OTR beam profile monitors during the first running period of the injector in spring 2004.
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| THPLT059 |
Design Study of a Movable Emittance Meter Device for the SPARC Photoinjector
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2619 |
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- A. Cianchi, L. Catani
INFN-Roma II, Roma
- M. Boscolo, M. Castellano, A. Clozza, G. Di Pirro, M. Ferrario, D. Filippetto, V. Fusco
INFN/LNF, Frascati (Roma)
- L. Giannessi, L. Picardi, M. Quattromini, C. Ronsivalle
ENEA C.R. Frascati, Frascati (Roma)
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Preliminary studies of the SPARC rf gun are planned to obtain an accurate analysis and optimization of the emittance compensation scheme, measuring the beam emittance evolution downstream the RF gun with an appropriate diagnostic system. Since with a space charge dominated beam the use of the quad-scan method is not possible a 1D pepper-pot method will be used. A mask with narrow slits will be mounted on a movable support, spanning a 1.5 m meters region to measure the emittance in several positions and reconstruct its behavior in the post gun section. Numerical simulations of the measurement process, mainly based on PARMELA and TREDI, are used to estimate the achievable accuracy and to optimize the experimental setup. Wake field effects induced by the beam propagation through the long bellows have been also investigated with HOMDYN. Based on these simulations the design of the apparatus, called emittance-meter, has been realized and is under construction at LNF.
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