All the papers should acknowledge the EU funding in the following way: The research leading to these results has received funding from the European Commission under the FP7-INFRASTRUCTURES-2010-1/INFRA-2010-2.2.11 project TIARA (CNI-PP).
Grant agreement no 261905.
CONFERENCE PAPER Design, Fabrication and High Power RF Test of a C-band Accelerating Structure for Feasibility Study of the SPARC photo-injector energy upgrade (IPAC11) / D. Alesini, R. Boni, G. Di Pirro, R. Di Raddo, M. Ferrario, A. Gallo, V. Lollo, F. Marcellini (INFN/LNF); T. Higo, K. Kakihara, S. Matsumoto (KEK); G.Campogiani, A. Mostacci, L. Palumbo, S. Persichelli, V. Spizzo (Rome University La Sapienza); S. Verdú-Andrés (TERA, Novara and IFIC (CSIC-UV)) WP8 / The energy upgrade of the SPARC photo-injector from 160 to more than 260 MeV will be done by replacing a low gradient 3m S-Band structure with two 1.4m high gradient C-band structures. The structures are travelling wave, constant impedance sections, have symmetric waveguide input couplers and have been optimized to work with a SLED RF input pulse. A prototype with a reduced number of cells has been fabricated and tested at high power in KEK (Japan) giving very good performances in terms of breakdown rates (10^6 bpp/m) at high accelerating gradient (>50 MV/m). The paper illustrates the design criteria of the structures, the fabrication procedure and the high power RF test results. TIARA-CONF-WP8-2011-001 / 2011-09-04
CONFERENCE PAPER Issues for a multi-bunch operation with SPARC C-band cavities (IPAC12) / D. Alesini (INFN/LNF), M. Migliorati (INFN/LNF, Rome University La Sapienza), A. Mostacci (INFN/LNF, Rome University La Sapienza), L. Palumbo (INFN-ROMA, Rome University La Sapienza), B. Spataro (INFN/LNF), C. Vaccarezza (INFN/LNF) WP8 / SPARC C-band traveling wave cavities were originally designed for the SPARC energy upgrade in the single bunch operation mode. In the context of a gamma source based on Compton backscattering and based on the SPARC C-band technology, we investigated the issues related to the use of these structures in the multi-bunch operation mode. Several beam configurations have been considered and the effects of transverse and longitudinal long range wakefields on beam dynamics have been studied. In the paper we present the results of these studies and, in particular, the issues related to transverse beam break-up that could prevent the multi-bunch operation. Possible HOM damped structures are also proposed.
CONFERENCE PAPER Status of the C-band RF System for the SPARC-LAB high brightness photo-injector (LINAC12) / R. Boni, D. Alesini, M. Bellaveglia, G. Di Pirro, M. Ferrario, A. Gallo, B. Spataro (INFN/LNF); A. Mostacci, L. Palumbo (Rome University La Sapienza) WP8 / The high brightness photo-injector in operation at the SPARC-LAB facility of the INFN-LNF, Italy, consists of a 150 MeV S-band electron accelerator aiming to explore the physics of low emittance high peak current electron beams and the related technology. Velocity bunching techniques, SASE and Seeded FEL experiments have been carried out successfully. To increase the beam energy so improving the performances of the experiments, it was decided to replace one S-band travelling wave accelerating cavity, with two C-band cavities that allow to reach higher energy gain per meter. The new C-band system is in advanced development phase and will be in operation early in 2013. The main technical issues of the C-band system and the R&D activities carried out till now are illustrated in detail in this paper. TIARA-CONF-WP8-2013-001 / 2013-01-07
NOTE Design, realization and low power RF tests of the C-band structure prototype for SPARC / D. Alesini, M. Ferrario, V. Lollo, R. Di Raddo (INFN/LNF); V. Spizzo, L. Palumbo (Rome University La Sapienza) WP8 / Task 8.1 The energy upgrade of the SPARC photo-injector from 170 to 240 MeV will be done by
replacing a low gradient S-Band structure with two C-band sections. The structures are
traveling wave constant impedance sections, have symmetric axial input couplers and have
been optimized to work with a SLED RF input pulse. The paper presents the design criteria of
the structures, the single cell parameter optimization and the coupler design. We also
illustrate the realization procedure and the low power RF test results on the prototype we have
realized for high gradient test performed at KEK (Japan). TIARA-NOTE-WP8-2011-002 / 2011-06-30
NOTE High Gradient Test of a C-Band Accelerating Structure Prototype for Energy Upgrade of Frascati Photoinjector SPARC (LNF-KEK) / D. Alesini et al. WP8 / Task 8.1 This report describes the activities carried out by the Frascati INFN Laboratories in close collaboration with the
Japanese Laboratory KEK for the development and high-power RF test of a prototype of a room-temperature Cband
travelling-wave accelerating structure. TIARA-NOTE-WP8-2011-003 / 2011-12-22
REPORT Design of a LLRF system for a High Gradient Acceleration R&D Infrastructure (MS31) / M. Brönnimann, I. Brunnenkant, A. Hauff, R. Kalt, L. Schebacher, S. Scherrer, T. Schilcher (PSI) WP8 / Task 8.2 This report summarizes the work which has been carried out to reach MS31, "Design LLRF", within the framework of TIARA, Work Package 8 (HGA, High Gradient Acceleration), Task 8.2 (RF Low Level Electronics for SPARC). The Low Level RF (LLRF) system requirements will be presented as well as a detailed description of the LLRF system design in order to reach the requirements. TIARA-REP-WP8-2012-011 / 2012-07-26
REPORT Design of the Accelerating Structures for a High Gradient Acceleration R&D Infrastructure (MS30) / D. Alesini, M. Bellaveglia, M. E. Biagini, R. Boni, A. Gallo, V. Lollo, L. A. Rossi, S. Strabioli (INFN/LNF)
M. Migliorati, A. Mostacci, L. Palumbo (University of Rome I „LaSapienza“) WP8 / Task 8.1 This report summarizes the work which has been carried out to reach MS30, "Design of the accelerating structures", within the framework of TIARA, Work Package 8 (HGA, High Gradient Acceleration), Task 8.1 (Design of the accelerating structures). TIARA-REP-WP8-2012-010 / 2012-07-26