TY  - JOUR
A1  - Minaev, Sergey
A1  - Ratzinger, Ulrich
A1  - Podlech, Holger
A1  - Busch, Marco
A1  - Barth, Winfried
T1  - Superconducting, energy variable heavy ion linac with constant 
β, multicell cavities of CH-type
T2  - Physical review. Special topics. Accelerators and beams
N2  - An energy variable ion linac consisting of multigap, constant-β cavities was developed. The effect of phase sliding, unavoidable in any constant-β section, is leading to a coherent rf phase motion, which fits well to the H-type structures with their long π-mode sections and separated lenses. The exact periodicity of the cell lengths within each cavity results in technical advantages, such as higher calculation accuracy when only one single period can be simulated, simpler manufacturing, and tuning. This is most important in the case of superconducting cavities. By using this concept, an improved design for a 217 MHz cw superconducting heavy ion linac with energy variation has been worked out. The small output energy spread of ± 3 AkeV  is provided over the whole range of energy variation from 3.5 to 7.3 AMeV. These capabilities would allow for a competitive research in the field of radiochemistry and for a production of super heavy elements (SHE), especially. A first 19-cell cavity of that type was designed, built, and rf tested successfully at the Institute for Applied Physics (IAP) Frankfurt. A 325.224 MHz, seven-cell cavity with constant  β = 0.16  is under development and will be operated in a frequency controlled mode. It will be equipped with a power coupler and beam tests with Unilac beams at GSI are foreseen.
Y1  - 2009
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/70385
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-703850
SN  - 2469-9888
VL  - 12
IS  - 120101
PB  - American Physical Society
CY  - College Park, MD
ER  -