Slide 1 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010.

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Presentation transcript:

Slide 1 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

The project was officially approved by CERN Management at the end of 2009 and is inside the CERN Medium Term Plan. The HIE upgrade of Radioactive Ion Beams at ISOLDE will occur on three fronts: Intensity (LINAC4 and target development) Quality (RFQ cooler) Energy (superconducting linear accelerator) 32 superconducting quarter-wave accelerating cavities. 8 superconducting solenoids. An addition of almost 40 MV of accelerating potential in 16.0 m. Design energy: 10 MeV/u for A/q = 4.5 Two sections: Low and high energy Slide 2 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

The first-order beam dynamics design is complete using the LANA code, benchmarking with Travel (Path Manager) and TRACE3D. Systematic studies of a parametric resonance phenomenon causing transverse emittance growth was investigated and suppressed. The study has been submitted for publication. Slide 3 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

Realistic beam dynamics studies made using the TRACK code has validated the design: target energy attained with minimal emittance growth (a few %). Operating point. Slide 4 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

Intensive studies of the existing REX linac in order to measure the longitudinal beam properties at injection to the SC upgrade. Slide 5 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

Slide 6 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

Tuning plate and actuator Variable coupler Focus on R&D of high-beta cavity. Simulations benchmarked using MWS, SuperFISH and HFSS. Slide 7 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

First copper cavity manufactured in-house at CERN, a second is in production. Pre-sputtering assembly, fabrication and cleaning of the copper substrate. Slide 8 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

R&D of sputtering at CERN using both diode and magnetron methods. A campaign of RF tests in tandem with sputtering R&D thanks to new test facility at SM18. Sputtering chamber.Nb cathode.Solenoid for magnetron sputtering. Slide 9 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010

Preliminary results: Strong copper substrate reduces the effects of microphonics. Cavity design modified to reduce sensitivity to He pressure fluctuations. Design Q reached at low field. Currently see strong multipacting at low field. Sputtering development now working in tandem with cavity testing at SM18. The internal structure of the test cryostat at SM18. The sputtered Nb deposit of the high-beta prototype. Slide 10 of 10Matthew Fraser – CI MEW Meeting, 25 th October 2010