Dresden 2017 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 5: Hadron and Electron Accelerators
AKBP 5.2: Talk
Wednesday, March 22, 2017, 15:15–15:30, MOL 213
High-Temperature Superconductor Coating for the FCC Beam Screen — •Patrick Krkotić1, Uwe Niedermayer1, and Oliver Boine-Frankenheim1,2 — 1TU Darmstadt - TEMF — 2GSI Helmholtzzentrum für Schwerionenforschung Darmstadt
The international Future Circular Collider (FCC-hh) study develops a conceptual design for a post LHC particle accelerator with collision energies up to 100 TeV. To mitigate beam instabilities the coupling impedance of the beam screen has to be sufficiently low. So far, copper coatings are intended, but the resulting impedance might not be low enough to run without an active feedback. Therefore, High-Temperature Superconductors (HTS) in the operating beam screen temperature of 40K to 60K are studied to reduce the coupling impedance.
The main idea is to display HTS and copper in several selected positions in the beam screen in form of alternating stripes. This is combined with a very thin surface layer of amorphous carbon coating to reduce the electron cloud effect. The behaviour of HTS and change in impedance under the given temperatures, frequencies, magnetic fields and synchrotron radiation is examined. The results of coupling impedance simulations using the two-dimensional finite element solver BeamImpedance2D [1] are given.
[1] U. Niedermayer, O. Boine-Frankenheim, and H. De Gersem, Phys. Rev. Special Topics * Accelerators and Beams 18, 032001, (2015)