| Article | |
| Report number | sLHC-PROJECT-Report-0026 ; CERN-sLHC-PROJECT-Report-0026 |
| Title | Design of the Pi-Mode Structure (PIMS) for Linac4 |
| Author(s) | Gerigk, F (CERN) ; Wegner, R (CERN) |
| Publication | 2010 |
| Imprint | 04 May 2009 |
| Number of pages | 4 |
| In: | Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.FR5REP051 |
| Subject category | Accelerators and Storage Rings |
| sLHC activity | Linac4 |
| Abstract | The PIMS will accelerate an H| − | beam from 100 MeV to 160 MeV, the output energy of Linac4. The cell length is constant within each of the 12 seven-cell cavities, but increases from cavity to cavity according to the increasing beam velocity. Its mechanical design is derived from the five-cell normal conducting LEP cavities, which were in operation at CERN for approximately 15 years. Even though the shunt impedance is around 10% lower than for a Side-Coupled Linac (SCL) operating at 704 MHz, the PIMS has the advantage of using the same RF frequency (352 MHz) as all the other accelerating structures in Linac4, thus simplifying and standardising the linac RF system. Furthermore, the simplified mechanical construction of the PIMS, which uses only 84 cells instead of over 400 for the SCL, also reduces construction costs and tuning effort. In this paper we present the electromagnetic design of the PIMS, including the arguments for the choice of a 5% cell-to-cell coupling factor, the shape of the coupling cells, the dimensioning of the wave-guide ports, and the expected field errors during operation. |
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Rekord stworzony 2009-11-06, ostatnia modyfikacja 2014-01-08
