Abstract
The Future Circular Collider for hadrons (FCC-hh) is the proposed high-energy frontier particle collider, which is expected to enable proton-proton collisions at a center-of-mass energy of 100 TeV. The specifications for the FCC-hh injection kicker system are very challenging. To provide fast magnetic field rise and fall times, and low ripple during the flat-top, ferrite loaded transmission line type magnets will be used. To limit the beam coupling impedance, a suitable beam screen will be placed in the aperture of each kicker magnet. Due to issues associated with the ``conventional'' beam screen design, used in the injection kickers magnets of the Large Hadron Collider (LHC), such as high voltage (HV) breakdowns and yoke heating problems, we have developed a novel concept of a helical beam screen. The fundamental advantage of the new design, in comparison to the conventional beam screen, is a significant reduction of the maximum voltage induced on the screen conductors, thus a greatly reduced probability of an electrical breakdown of the beam screen. In addition, the longitudinal beam coupling impedance of the helical beam screen is optimized to reduce power deposition in the kicker magnet. Furthermore, the helical beam screen allows a reduction of the maximum transverse beam coupling impedance of the kicker system. Detailed numerical simulations, theoretical studies and experimental results demonstrate that a new design is a promising solution not only for the FCC-hh, but also for existing machines.
Highlights
The FCC-hh is foreseen to extend research in high energy physics when the Large Hadron Collider (LHC) and its high-luminosity upgrade (HL-LHC) reach their full discovery potential [1]
Due to issues associated with the “conventional” beam screen design, used in the injection kickers magnets of the Large Hadron Collider (LHC), such as high voltage (HV) breakdowns and yoke heating problems, we have developed a novel concept of a helical beam screen
Due to the HV issues associated with the conventional beam screen design, we have proposed and studied the new concept of a helical beam screen
Summary
The FCC-hh is foreseen to extend research in high energy physics when the LHC and its high-luminosity upgrade (HL-LHC) reach their full discovery potential [1]. Since the circulating beam passes through the aperture of the kicker magnet, the beam induced heating, with long duration fills, causes a temperature rise of the ferrite yoke, which could exceed its Curie temperature (TC). To limit power deposition in the ferrite yoke, a suitable beam screen, placed in the aperture of each kicker magnet, will be a critical feature. The beam screen must satisfy challenging requirements of good HV performance, low beam coupling impedance, fast magnetic field rise and fall times with low ripple of the field during the flat-top, low secondary electron yield (SEY), good radiation resistance, compatibility with ultrahigh vacuum and the ability to withstand temperatures up to 350°C during bakeouts. The helical screen design reduces the maximum transverse impedance of the kicker system, it is the baseline proposed for the FCC-hh
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