• B. Schlitt, G. Clemente, C.M. Kleffner, M.T. Maier, A. Reiter, W. Vinzenz, H. Vormann
  GSI, Darmstadt
• C. Biscari
  INFN/LNF, Frascati (Roma)
• E. Bressi, M. Pullia, E. Vacchieri, S. Vitulli
  CNAO Foundation, Milan
• A. Pisent, P.A. Posocco, C. Roncolato
  INFN/LNL, Legnaro (PD)

The Cen­tro Nazionale di Adroter­apia On­co­log­i­ca (CNAO) present­ly under com­mis­sion­ing in Pavia, Italy, will be the first Ital­ian fa­cil­i­ty for the treat­ment of deeply seat­ed tu­mours with pro­ton and car­bon ion beams. The CNAO ac­cel­er­a­tor com­pris­es a 7 MeV/u in­jec­tor linac and a 400 MeV/u syn­chrotron. The 216.8 MHz linac is a copy of the linac at the Hei­del­berg Ion-Beam Ther­a­py Cen­tre (HIT) and con­sists of a 400 keV/u 4-rod type RFQ and of a 20 MV IH type drift tube linac. In 2004, a col­lab­o­ra­tion be­tween CNAO and GSI was es­tab­lished for con­struc­tion and com­mis­sion­ing of the linac. GSI su­per­vised the man­u­fac­tur­ing of the linac and of its tech­ni­cal sys­tems, per­formed cop­per-plat­ing, as­sem­bly, and tun­ing (to­geth­er with IAP Frank­furt), and de­liv­ered com­plete beam di­ag­nos­tics sys­tems. The RFQ was test­ed at GSI with pro­ton beams to­geth­er with the BD sys­tems prior to de­liv­ery to CNAO. In­stal­la­tion and com­mis­sion­ing in Pavia were per­formed in col­lab­o­ra­tion by CNAO, GSI, and INFN. RFQ and there­after IH linac were suc­cess­ful­ly com­mis­sioned in two steps in 2009, both with (H3)+ and car­bon ion beams. The re­sults of the linac com­mis­sion­ing will be re­port­ed as well as a com­par­i­son to the HIT linac.

• P. Gerhard, W.A. Barth, L.A. Dahl, A. Orzhekhovskaya, K. Tinschert, W. Vinzenz, H. Vormann, S.G. Yaramyshev
  GSI, Darmstadt
• A. Schempp, M. Vossberg
  IAP, Frankfurt am Main

The super heavy el­e­ment re­search is one of the out­stand­ing pro­jects at GSI. At SHIP* six new el­e­ments have been dis­cov­ered; more­over, nu­cle­ar chem­i­cal ex­per­i­ments with trans­ac­tinides were re­cent­ly per­formed at TASCA**. This ex­per­i­men­tal pro­gram strong­ly ben­e­fits from high av­er­age beam in­ten­si­ties. In the past beam cur­rents were raised sig­nif­i­cant­ly by a num­ber of im­prove­ments. The pre­sent up­grade pro­gram com­pris­es the in­stal­la­tion of a su­per­con­duct­ing (sc) 28 GHz ECR ion source, a new fron­tend (low en­er­gy beam trans­port and RFQ), and, in the long term, an sc cw Linac. For the short term, the new RFQ will raise the duty fac­tor by a fac­tor of two (50%), lim­it­ed by the fol­low­ing ac­cel­er­a­tor only. This bot­tle­neck will be re­solved by the ap­plied cw Linac. Beam tests with a newly de­vel­oped sc CH cav­i­ty are sched­uled for 2012. The setup of the RFQ as the major up­grade of the 20 year old HLI*** is in progress, the com­mis­sion­ing will be fin­ished in March 2010. Be­sides a high­er duty fac­tor, im­proved lon­gi­tu­di­nal beam qual­i­ty and trans­mis­sion are ex­pect­ed. This paper re­ports on the chal­leng­ing rf and beam com­mis­sion­ing.

* Separator for Heavy Ion Reaction Products
** TransActinide Separator and Chemistry Apparatus
*** High charge state injector, a part the UNILAC

• R. Eichhorn, A. Araz, U. Bonnes, F. Hug, M. Konrad, P. Nonn
  TU Darmstadt, Darmstadt
• G. Schreiber, W. Vinzenz
  GSI, Darmstadt
• R. Stassen
  FZJ, Jülich

Dur­ing the re­design of the low level RF sys­tem for the S-DALINAC, a base­band ap­proach was cho­sen. The RF sig­nals from/ to the cav­i­ty are con­vert­ed into the base­band via I/Q Mod­u­la­tors/ De­mod­u­la­tors. The ad­van­tage of this de­sign was re­al­ized lat­eron, as adap­tion of other fre­quen­cies be­comes rather easy. The sys­tem, orig­i­nal­ly de­signed for 3 GHz su­per­con­duct­ing cav­i­ty in cw op­er­a­tion is cur­rent­ly mod­i­fied to con­trol a 324 MHz room tem­per­a­ture CH cav­i­ty in pulsed op­er­a­tion. We will re­port on the rf con­trol sys­tem prin­ci­ple, the re­quired mod­i­fi­ca­tions and first re­sults.