Conveners
Technology: SRF: Directions for R&D
- Olivier Brunner (CERN)
Technology: SRF Technologies 01
- Anne-Marie Valente-Feliciano
Technology: SRF Technologies 02
- Thomas Proslier
Technology: first session
- Giorgio Apollinari (Fermi National Accelerator Lab. (US))
Technology: second session
- Roberto Losito (CERN)
Technology: R&D
- Tatiana Pieloni (EPF Lausanne)
Current strategy and ongoing activities will be presented, in relation to R&D and preparation of production for the elliptical cavities needed by FCC
In the frame of the Future Circular Collider (FCC) study, CERN is modelling the copper electropolishing process. The aim is to foresee and optimise the process parameters such as cathode geometry, bath flow and temperature, and minimum potential input, namely on the 400 MHz single cell FCC type cavities and thus contributing in achieving the ultimate performance on the Nb/Cu technology. In...
Since the late 80โs, CERN has pioneered development of thin film superconducting radio-frequency cavities for particle accelerators. This technology, used in LEP II, LHC and more recently in HIE-ISOLDE, presents many advantages. As a consequence, many efforts are put in place at CERN in view of its potential implementation in the FCC machines. However, niobium thin film cavities historically...
The Future Circular Collider (FCC) study focuses on the design and technology developments of a new research infrastructure capable of hosting the next generation of particle colliders at CERN. CERN developed significant know-how in the design and fabrication of niobium-coated copper superconducting radiofrequency (SRF) cavities for accelerators, from the Large LEP, to the LHC, and HIE-ISOLDE....
The Nb/Cu SRF cavities offer several advantages with respect to the bulk Nb cavities. However, their application has been limited due to a degradation in the performance systematically observed at high accelerating gradients. In recent years, a vast R&D campaign has been devoted to the optimization of the manufacturing process of 1.3 GHz cavities at all levels, from the production of the...
CERN has successfully operated a number of Nb coated Cu cavities for a number of years, most notably in the LEP, LHC and HIE ISOLDE accelerators. In order to meet the requirements for the Future Circular Collider (FCC), an increase in the quality factor of the accelerating cavities, while maintaining the operating temperature of 4.5 K, is required. Because of its lower BCS resistance and...
The innovative concept of two-stage multi-beam Klystron has been previously proposed and studied for a 1GHz 20MW Klystron for CLIC. This technology utilizes low voltage electron beam in its first stage to reduce the overall tube length, followed by DC post acceleration in the second stage to ensure ultra-high efficiency. This topology is very practical to provide compact design at a low...
An innovative superconducting cavity topology has been recently proposed at CERN and at Lancaster University. It integrates longitudinal slots crossing perpendicularly the RF surface. The RF current lines run along the slots, inducing no perturbation of the accelerating mode. Thanks to this approach, the cavity can be built using halves or quadrants, which is well appropriate to precise...
Coupled aperture magnet designs have been proposed for the dipole and quadrupole of the FCC-ee collider during the CDR phase. They are characterized by a high energy efficiency but the aperture coupling brings additional challenges to achieve the field quality requirements, in particular for the quadrupole when an active system is added to trim the field to the energy saw-tooth generated by...
The Future Circular Collider study program comprises several machine concepts for the future of high-energy particle physics. In particular, a twin-ring e-e+ collider capable to run at beam energies between 45.6 and 182.5 GeV is proposed as a first phase. The design of its two 100-km ring vacuum system has to deal with low-energy (45.6 GeV) high-current (1390 mA) version as well as the...
Power converters are needed to supply all magnets and RF systems for the FCC-ee and FCC-hh. This needs to consider the required accelerator controllability and precision, as well as the electrical AC network power quality. The design procedure needs to minimise the total investment and operational costs (losses, availability, etc.). Aspects such as losses in underground areas, power converters...
The world (both natural and man-made) is a complex, unstructured, cluttered and dynamically changing environment, in which humans and animals move across varying terrain (towns/cities, industrial infrastructures, countryside, forest, mountains, etc.) easily changing their gait, behaviours and motions, while performing simple and complex tasks involving coordination of the arms, body and legs....
At CERN we heavily use robots for inspection, maintenance and repair tasks throughout our accelerator complex, facing challenges of hazardous environments, cluttered areas, changing conditions and limited communication channels. To support these activities, we invest in research and development in novel fields of hardware, sensors, vision, navigation, manipulation, communication and machine...
While the manufacturing industry is strongly engaged in robotization, the construction field is still facing important scientific and technical challenges in this area. Indeed, this sector requires that robots work in large spaces, in accurate ways, on very varied activities where know-how must be adapted to complex environments. Therefore, we present several industrial studies that Nantes...
The most relevant challenges of telerobotics technologies for the coming years are precise manipulation in semi-structured environments, high levels of tightening torque, and reduced execution time. Also, an iterative design of remote handling processes is necessary to comply with maintenance requirements properly. Other aspects to consider are operator training and robot recovery strategies,...
The beam parameters of FCC-ee with its high-intensity beams and large dynamic range lead to exceptional requirements for beam instrumentation devices. For high energy lepton machines, the detection of synchrotron radiation for the measurement of bunch length has been common practice in the past. However, given the exceptional size of FCC-ee, extracting synchrotron light comes with technical...
Currently a semi-passive beam dilution system is foreseen for the FCC-ee beam dumping system. This system utilizes passive beam diluters (spoilers) made from carbon-based materials. To test the performance of these spoilers, an experiment was carried out in November 2021 at CERNs HiRadMat Facility with scaled prototypes of the proposed spoiler design. By using special beam optics to mimic the...
The construction of a mock-up of an arc half-cell of the FCC e+e- collider and booster is proposed, with the goal investigate the aspects related to integration, assembly, transport and maintenance of its components. As a first step, in the next months, it is necessary to develop an optimum overall integration solution for the arc, taking into account all the abovementioned constraints on top...
