• C. Pasotti, M. Bocciai, L. Bortolossi, A. Fabris, M. Ottobretti, M. Rinaldi, R. Visintini
  ELETTRA, Basovizza

The full energy injection is now the standard procedure for the Elettra synchrotron radiation light source. The four RF storage ring plants have been benefited by this procedure in terms of reliability and stability of operation. The injector booster RF plant is running well. A new High Order Mode (HOM) diagnostic board has been implemented using the radiofrequency (RF) cavity’s signal to improve the HOM’s detection. The analysis and the performances of the new Inductive Output Tube (IOT)based RF power transmitter are presented.

• D. Wang, G. D'Auria, P. Delgiusto, A. Fabris, M.M. Milloch, A. Rohlev, C. Serpico
  ELETTRA, Basovizza

Funding: The work was supported in part by the Italian Ministry of University and Research under grant FIRB-RBAP045JF2

The former linac sections used in the injector system of the Elettra Laboratory storage ring will be upgraded for use on the FERMI@elettra project, a free-electron laser user facility operating down to 3 nm. These seven accelerating sections are 3π/4 mode backward-travelling wave (BTW) constant-impedance structures, powered by 45 MW TH2132A klystrons couple to what was called a PEN – power enhancement network, or more commonly referred to as a SLED system. Due to breakdown problems inside the sections, that was the result of high peak fields generated during conventional SLED operation, the sections experienced difficulties in reaching the design gradients. To lower the peak field and make the compressed pulse “flatter”, phase-modulation of the SLED drive power option is investigated. This paper presents the results of this investigations and includes a detailed mathematically analysis.

• A. Fabris, A.O. Borga, P. Delgiusto, O. Ferrando, A. Franceschinis, F. Gelmetti, M.M. Milloch, A. Milocco, G.C. Pappas, A. Rohlev, C. Serpico, N. Sodomaco, R. Umer, L. Veljak, D. Wang
  ELETTRA, Basovizza

Funding: The work was supported in part by the Italian Ministry of University and Research under grants FIRB-RBAP045JF2 and FIRB-RBAP06AWK3

FERMI@Elettra is a seeded FEL user facility under construction at Sincrotrone Trieste, Italy. The linac is based on S-band normal conducting technology. It will use the accelerating sections of the original Elettra linac injector, seven sections received from CERN after LIL decommissioning and two additional sections to be constructed for a total number of 18 S-band accelerating structures. Installation of the machine is presently being carried on. This paper will provide a summary of the requirements of the different parts of the S-band RF system and of the options for a possible upgrade path both in energy and reliability. The ongoing activities on the main subassemblies, in particular regarding the tests and the installation work, are also presented.