Conveners
FCC-hh accelerator (EuroCirCol): Machine design WP2 (1)
- Massimo Giovannozzi (CERN)
FCC-hh accelerator (EuroCirCol): Machine design WP2 (2)
- Barbara Dalena (Université Paris-Saclay (FR))
FCC-hh accelerator (EuroCirCol): Experimental Insertion Region design WP3 (1)
- Antoine Chance (CEA)
FCC-hh accelerator (EuroCirCol): Experimental Insertion Region design WP3 (2)
- Tatiana Pieloni (EPF Lausanne)
FCC-hh accelerator (EuroCirCol): Cryo-beam vacuum design WP4 (1)
- Roberto Kersevan (CERN)
FCC-hh accelerator (EuroCirCol): Cryo-beam vacuum design WP4 (2)
- Sara Casalbuoni (IBPT-KIT)
FCC-hh accelerator (EuroCirCol): 16 Tesla magnet WP5 (1)
- Alexander Zlobin (Fermilab)
FCC-hh accelerator (EuroCirCol): 16 Tesla magnet WP5 (2)
- Antti Aleksis Stenvall
The Nb$_3$Sn dipole design for the hadron machine option of the Future Circular Colliders enters in an intense and long R&D phase. As a result, more realistic dipole field quality evaluations are available for beam dynamics studies. The impact of the dipole field quality on the optics design and on the beam lifetime at injection are presented and the non-linear correction schemes defined. The...
Landau damping provided by dedicated octupole magnets should be employed in the FCC-hh as a cure against transverse coherent instabilities, in addition to a transverse feedback system. In the LHC, the Landau octupoles are routinely combined with finite chromaticity and the transverse feedback system in order to ensure the bunch stability through the cycle. We estimate the required Landau...
FCC-hh impedance-driven beam instabilities and the corresponding mitigation techniques will be outlined. Recent post-CDR updates on impedances will be summarized.
In addition to physics requirements and the injector chain capability, the choice of the rf and longitudinal beam parameters in the FCC-hh is defined by transverse and longitudinal single-bunch stability. Namely, the Transverse Mode Coupling Instability (TMCI) should be prevented for the calculated transverse impedance model, and Landau Damping in the longitudinal plane should be provided for...
An overview is given of the design principles and layout of the FCC-hh collimation system, and recent modifications are highlighted. Furthermore, a brief overview of the simulated performance of the system is shown, comparing with design scenarios for beam losses. This topic will be expanded in more detail in the following talks.
Thermo-structural studies of the most loaded primary (TCP) and secondary (TCS) collimators of the FCC were performed for both 1 h Beam Lifetime (BLT) and 0.2 h BLT operating conditions. The simulated collimator has a similar design to primary and secondary collimators used in LHC, though a thicker absorber block in Carbon-Fiber-Carbon (CFC) is adopted. For the early conceptual design, a...
The FCC-hh interaction region is heavily impacted by the collision debris, generated at the interaction point. In order to assess its effects on the triplet as well as on the matching section magnets, FLUKA simulations were performed assuming the ultimate integrated and instantaneous luminosity. In this presentation, the obtained results will be discussed for both the vertical and the...
Synchrotron radiation emitted by the 50 TeV protons of the FCC-hh in the last bending and quadrupole magnets upstream the interaction region has been simulated and characterized in terms of emitted power, flux, photons spectrum and fans. The study is focused on the evaluation of the fraction of photons that reaches the experimental region and may hit the detector.
This work was supported by...
The baseline design for the FCC-hh foresees next to the two high luminosity experiments also two lower luminosity experimental insertions. Similar as in the LHC, in these insertions also the beams from the injector will be injected upstream of the experiment. We present here the status of design for these insertions together with the challenges arising from the combination of these two...
A High Energy Booster (HEB) is needed as an injector for the FCC-hh. This talk outlines the options available based on studies carried out over the last few years. The principal features of each option are shown and a strategy on how to proceed to reach a HEB TDR in 5 years is proposed.
The vacuum chamber of the FCC-hh will have to cope with unprecedented levels of synchrotron radiation power for proton colliders, dealing simultaneously with a tighter magnet aperture. Since the high radiation power and photon flux will release larger amounts of gas into the system, to keep a good vacuum level in the FCC-hh becomes considerably more challenging than in the LHC.
This...
The properties of vacuum components working at cryogenic temperature represent a crucial aspect to assure accelerator's best performances. Recently, pulsed laser processing of Cu samples (LASE-Cu) has been demonstrated to produce rough surfaces, whose structuring at the nanoscale ensures an impressive reduction of the secondary electron yield and, then, of electron cloud phenomena. This...
In recent and future high performance energy colliders, the knowledge of many physical properties of the materials walls to be used is an essential prerequisite. Among others, it is necessary to study materials behaviour after exposure to the synchrotron radiation (SR) produced by the circulating particles. Such SR interacts with the machine vacuum walls and may produce photoelectrons, induce...
The reduction of secondary electron yield (SEY) is a very effective way of mitigation of electron cloud (e-cloud) and beam induced electron multipacting in accelerator beam chambers and RF wave guides. During the past five years it has been shown that Laser Ablation Surface Engineering (LASE) is very effective method to reduce SEY well below one. Furthermore, it was shown that the reduction...
The non-evaporable getter (NEG) coating is an important component of vacuum systems in many current particle accelerators due to its high evenly distributed pumping speed and low thermal outgassing and electron, photon and ion stimulated desorption yields. Coatings made of compound materials, e.g. TiZrV or TiZrHfV, have been found to have the highest sticking probabilities and lowest...
In the framework of the EuroCirCol collaboration (work package 4 "Cryogenic Beam Vacuum System"), three FCC-hh beam screen (BS) prototypes have been tested at the Beam Screen TEstbench Experiment (BESTEX) installed at the 2.5 GeV electron storage ring KARA (KArlsruhe Research Accelerator) light source at the Karlsruhe Institute for Technology (KIT). Each of the three BS prototypes, 2 m in...
We present the CCT design for an FCC-hh or HE-LHC 16-T main dipole magnet and its evolution from initial designs from Lawrence Berkeley National Laboratory to the conceptual design reports. We also discuss main advantages and disadvantages of this design, together with technical challenges and potential solutions as encountered in the model-magnet design and construction at Paul Scherrer Institute.
Three different 16 T dipole magnet options for the Future Circular Collider have been designed within the H2020 EuroCirCol collaboration. Namely, a cosθ-type, a block-type, and a common-coil type magnets have been considered. All magnets were designed using the same design criteria related to magnetic field, cable parameter space, mechanical constraints, and quench protection. The quench...
A 2D collar-based mechanical analysis and a 3D electromagnetic investigation of the 360 T/m FCC main quadrupoles are presented. The magnet coils rely on a conventional cos(2θ) layout. One of the challenges is the windability around the 50 mm aperture of the 16 mm wide Rutherford cable made of 0.85 mm strand. This is going to be investigated in the near future.
Cost-effective manufacturing of Nb3Sn magnets for HE-LHC and FCC could be achieved through optimization of HL-LHC magnet manufacturing performance using key performance indicators (KPI) such as cost and quality. However, optimization of Nb3Sn magnet manufacturing performance is computationally expensive due to the large number of manufacturing parameters, design variables, and KPI, whose...
