TY  - JOUR
AU  - Alesini, D.
AU  - Boni, R.
AU  - Di Pirro, G.
AU  - Di Raddo, R.
AU  - Ferrario, M.
AU  - Gallo, A.
AU  - Lollo, V.
AU  - Marcellini, F.
AU  - Palumbo, L.
AU  - Spizzo, V.
AU  - Mostacci, A.
AU  - Campogiani, G.
AU  - Persichelli, S.
AU  - Enomoto, A.
AU  - Higo, T.
AU  - Kakihara, K.
AU  - Kamitani, T.
AU  - Matsumoto, S.
AU  - Sugimura, T.
AU  - Yokoyama, K.
AU  - Verdu-Andres, S.
PY  - 2013
DA  - 2013//
TI  - The C-Band accelerating structures for SPARC photoinjector energy upgrade
T2  - J. Instrum.
JO  - Journal of Instrumentation
SP  - P05004 - 24pp
VL  - 8
PB  - Iop Publishing Ltd
KW  - Acceleration cavities and magnets superconducting (high-temperature superconductor
KW  - radiation hardened magnets
KW  - normal-conducting
KW  - permanent magnet devices
KW  - wigglers and undulators)
KW  - Accelerator Subsystems and Technologies
KW  - Instrumentation for FEL
AB  - The use of C-Band structures for electron acceleration and production of high quality beams has been proposed and adopted in several linac projects all over the world. The two main projects that adopted such type of structures are the Japanese Free Electron Laser (FEL) project in Spring-8 and the SwissFEL project at Paul Scherrer Institute (PSI). Also the energy upgrade of the SPARC photo-injector at LNF-INFN (Italy) from 150 to more than 240 MeV will be done by replacing a low gradient S-Band accelerating structure with two C-band structures. The structures are Traveling Wave (TW) and Constant Impedance (CI), 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 realization procedure and the low and high power RF test results on a prototype. The high power tests have been carried out by the Frascati INFN Laboratories in close collaboration with the Japanese Laboratory KEK. Experimental results confirmed the feasibility of the operation of the prototype at 50 MV/m with about 10(6) breakdowns per pulse per meter. Such high gradients have not been reached before in C-Band systems and demonstrated the possibility to use C-band accelerators, if needed, at such high field level. The results of the internal inspection of the structure after the high power test are also presented.
SN  - 1748-0221
UR  - https://doi.org/10.1088/1748-0221/8/05/P05004
DO  - 10.1088/1748-0221/8/05/P05004
LA  - English
N1  - WOS:000320726000014
ID  - Alesini_etal2013
ER  -