Volume 140, Number 6, December 2022
|Number of page(s)||7|
|Section||Nuclear and plasma physics, particles and fields|
|Published online||28 December 2022|
Potential impedance reduction by REBCO-coated conductors as beam screen coating for the Future Circular Hadron Collider
1 ALBA Synchrotron Light Source - Carrer de la Llum 2-26, 08290 Cerdanyola del Valles, Barcelona, Spain
2 UPC CommSensLab, Department of Signal Theory and Communications, Universitat Politècnica de Catalunya C. Jordi Girona 1, 08034 Barcelona, Spain
3 CERN, Technology Department - Espl. des Particules 1, 1211 Meyrin, Switzerland
(a) E-mail: email@example.com (corresponding author)
Received: 6 October 2022
Accepted: 12 December 2022
The Future Circular Collider study creates a conceptual design for a post-LHC particle accelerator using 16 T superconducting dipoles to achieve collision energies of up to 100 TeV in a 90 km circumference ring. A copper-coated beam screen, similar to that used in the LHC, is planned. However, the undertaken research indicates that copper at the high working temperature of 50 K has a strong influence on the accelerator's performance, particularly at injection energy. In this work, we relate the experimentally determined properties of REBCO-coated conductors with their potential performance in the FCC-hh beam screen. Specifically, we use a round pipe approximation to demonstrate that a beam screen coated with a combination of REBCO and copper can have a much lower resistive wall impedance than one using only copper. The reduction is substantial (several orders of magnitude), and is observed in both the longitudinal and transverse wall impedance. Such a reduction has important effects on beam stability, operating costs, potential reduction in beam screen size, and lowering the stringent specifications of the 16 T magnets required for the Future Circular Hadron Collider.
© 2022 The author(s)
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