Author: Dziuba, F.D.
Paper Title Page
WEPWO005 Microphonics Analysis of the SC 325 MHz CH-Cavity 2319
 
  • M. Amberg, M. Busch, F.D. Dziuba, H. Podlech, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • M. Amberg, K. Aulenbacher
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  
  Since the walls of su­per­con­duct­ing (sc) cav­i­ties are kept very thin to sup­port the cool­ing process, even small me­chan­i­cal dis­tur­bances can de­tune the cav­ity. One of the main sources of de­tun­ing a cav­ity is mi­cro­phon­ics. These low-fre­quent vi­bra­tions caused by vac­uum pumps or un­der­ground noise are trans­ferred to the cryo­stat and ex­cite me­chan­i­cal res­o­nances of the cav­ity which may lead to fre­quency shifts larger than the band­width. To de­ter­mine the me­chan­i­cal res­o­nance fre­quen­cies of the sc 325 MHz CH-cav­ity (Cross­bar-H-Mode) sim­u­la­tions with ANSYS Work­bench have been per­formed in a first step. Ad­di­tion­ally, mi­cro­phon­ics mea­sure­ments were taken at room tem­per­a­ture as well as in a ver­ti­cal cryo­stat at 4K in the cryo-lab of the IAP, Frank­furt Uni­ver­sity. Fur­ther­more, the con­trac­tion of the cav­ity walls and the re­sult­ing fre­quency shift due to the cav­ity cool-down has been mea­sured. A com­par­i­son be­tween sim­u­la­tion re­sults and the mea­sured val­ues is pre­sented in this paper.  
 
THPWO007 Advanced Superconducting CW Heavy Ion Linac R&D 3770
 
  • W.A. Barth, S. Mickat, A. Orzhekhovskaya
    GSI, Darmstadt, Germany
  • M. Amberg, K. Aulenbacher, V. Gettmann, S. Jacke
    HIM, Mainz, Germany
  • F.D. Dziuba, H. Podlech, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  An ad­vanced up­grade pro­gram has to be re­al­ized in the next years, such that en­hanced pri­mary beam in­ten­si­ties are avail­able. For this a new sc 28 GHz full per­for­mance ECR ion source has to be es­tab­lished. Via a new low en­ergy beam line an al­ready in­stalled new RFQ and an IH-DTL will pro­vide for cw-heavy ion beams with high av­er­age beam in­ten­sity. It is fore­seen to build a new cw-heavy ion-linac be­hind this high charge state in­jec­tor. In prepa­ra­tion an ad­vanced R&D pro­gram is de­fined: The first linac sec­tion com­pris­ing a sc CH-cav­ity em­bed­ded by two sc so­le­noids (fi­nanced by HIM and partly by HGF-ARD-ini­tia­tive) as a demon­stra­tor will be tested in 2014). After suc­cess­full test­ing an ad­vanced cry­omod­ule com­pris­ing up to 4 rf cav­i­ties is fore­seen. First lay­out sce­nar­ios of this ad­vanced test bench will be pre­sented.  
 
THPWO016 Superconducting CH Cavities for Heavy Ion Acceleration 3794
 
  • F.D. Dziuba, M. Amberg, M. Busch, H. Podlech, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • M. Amberg, K. Aulenbacher, W.A. Barth, S. Mickat
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • W.A. Barth, S. Mickat
    GSI, Darmstadt, Germany
  
  Funding: Work supported by HIM, GSI and BMBF Contr. No. 06FY7102
To demon­strate the op­er­a­tion abil­ity of su­per­con­duct­ing (sc) Cross­bar-H-mode (CH) cav­ity tech­nol­ogy a 217 MHz struc­ture of this type is under de­vel­op­ment at the In­sti­tute for Ap­plied Physics (IAP) of Frank­furt Uni­ver­sity. The cav­ity has 15 ac­cel­er­at­ing cells and a de­sign beta of 0.059. It will be equipped with all nec­es­sary aux­il­iaries like a 10 kW power cou­pler and a tun­ing sys­tem. Cur­rently, the cav­ity is under con­struc­tion. Fur­ther­more, this cav­ity will serve as demon­stra­tor for a sc con­tin­u­ous wave (cw) LINAC at GSI. The pro­posed cw LINAC is highly re­quested to ful­fil the re­quire­ments of nu­clear chem­istry and es­pe­cially for a com­pet­i­tive pro­duc­tion of new Super Heavy El­e­ments (SHE) in the fu­ture. A full per­for­mance test by in­ject­ing and ac­cel­er­at­ing a beam from the GSI High Charge In­jec­tor (HLI) is planned in 2014. The cur­rent sta­tus of the sc CH cav­ity and the demon­stra­tor pro­ject is pre­sented.