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View article: Future circular collider feasibility study report
Future circular collider feasibility study report Open
In response to the 2020 Update of the European Strategy for Particle Physics , the Future Circular Collider (FCC) Feasibility Study was launched as an international collaboration hosted by CERN. This report describes the FCC integrated pro…
View article: Shielded Pair Method for Beam Screen Surface Resistance Measurement at Cryogenic Temperature
Shielded Pair Method for Beam Screen Surface Resistance Measurement at Cryogenic Temperature Open
The shielded pair resonator method is a useful tool in the measurement of accelerator components, such as the beam screens used in the Large Hadron Collider (LHC), the High-Luminosity (HL) LHC, or future accelerators. It can measure the re…
View article: Training-free performance of the wax-impregnated SuShi septum magnet
Training-free performance of the wax-impregnated SuShi septum magnet Open
In the framework of the Future Circular Collider Study a new septum magnet concept, nicknamed ‘SuShi’ has been developed, and a prototype was built at Wigner Research Center for Physics, and tested at the FREIA facility of Uppsala Universi…
View article: Status of Nb-Ti CCT Magnet EU Programs for Hadron Therapy
Status of Nb-Ti CCT Magnet EU Programs for Hadron Therapy Open
The use of Canted Cosine Theta (CCT) magnets for accelerator applications has gained popularity due to their ease of manufacturing and assembly. In the context of two EU-Horizon2020-funded projects, HITRIplus and IFAST, the development of …
View article: Strongly curved super-conducting magnets: beam optics modeling and field quality
Strongly curved super-conducting magnets: beam optics modeling and field quality Open
Superconducting (SC) dipoles with a strong curvature (radius smaller than 2 meters, for an aperture of about 100 mm and a length of 1-3 meters) are required for applications where compactness is key, such as the synchrotron and gantry for …
View article: Magnet Technology and Design of Superconducting Magnets for Heavy Ion Gantry for Hadron Therapy
Magnet Technology and Design of Superconducting Magnets for Heavy Ion Gantry for Hadron Therapy Open
Various initiatives in Europe have been launched to study superconducting magnets for a rotatable gantry suitable to deliver up to 440 MeV/A carbon ions for hadron therapy. One initiative is led by INFN inside an agreement with CERN, CNAO,…
View article: Dielectric resonator to measure surface resistance of accelerator components at room temperature and 77 K
Dielectric resonator to measure surface resistance of accelerator components at room temperature and 77 K Open
We measured the surface resistance of titanium, amorphous carbon, and nonevaporable getter (NEG) coatings on copper samples, representative of surface treatments of beam-facing components in the High-Luminosity Large Hadron Collider at CER…
View article: Magnet Layout decision and engineering design report of the curved CCT dipole magnet demonstrator
Magnet Layout decision and engineering design report of the curved CCT dipole magnet demonstrator Open
The Heavy Ion Therapy Research Integration plus (HITRIplus) European H2020 project aims at bringing together, integrating on European scale, and opening up to European researchers from academia and industry, the key research infrastructure…
View article: Straight and Curved Canted Cosine Theta Superconducting Dipoles for Ion Therapy: Comparison Between Various Design Options and Technologies for Ramping Operation
Straight and Curved Canted Cosine Theta Superconducting Dipoles for Ion Therapy: Comparison Between Various Design Options and Technologies for Ramping Operation Open
<p>Canted Cosine Theta layout for accelerator magnets is a very attractive since such magnets can be manufactured and assembled without big tooling, and with a relatively modest number of parts and tools. In the frame of European Hor…
View article: Laser spectroscopy of long-lived pionic and antiprotonic helium in superfluid helium
Laser spectroscopy of long-lived pionic and antiprotonic helium in superfluid helium Open
The PiHe collaboration of PSI recently carried out laser spectroscopy of an infrared transition in three-body pionic helium atoms that were synthesized in a superfluid (He-II) helium target. Analogous measurements of antiprotonic helium at…
View article: Laser spectroscopic studies of long-lived pionic helium at PSI
Laser spectroscopic studies of long-lived pionic helium at PSI Open
A recent laser spectroscopy experiment of three-body pionic helium atoms which was carried out using the 590 MeV ring cyclotron facility of the Paul Scherrer Institute (PSI) is briefly reviewed. The charged pion mass may be precisely deter…
View article: High-resolution laser resonances of antiprotonic helium in superfluid 4He
High-resolution laser resonances of antiprotonic helium in superfluid 4He Open
When atoms are placed into liquids, their optical spectral lines corresponding to the electronic transitions are greatly broadened compared to those of single, isolated atoms. This linewidth increase can often reach a factor of more than a…
View article: A European Collaboration to Investigate Superconducting Magnets for Next Generation Heavy Ion Therapy
A European Collaboration to Investigate Superconducting Magnets for Next Generation Heavy Ion Therapy Open
Next generation ion therapy magnets both for gantry and for accelerator (synchrotron) are under investigation in a recently launched European collaboration that, in the frame of the European H2020 HITRI\nplus\n and I.FAST programmes, has o…
View article: Recent progress of laser spectroscopy measurements of pionic helium
Recent progress of laser spectroscopy measurements of pionic helium Open
We review the results of recent laser spectroscopy experiments on metastable pionic helium atoms at the Paul Scherrer Institute’s 590 MeV cyclotron facility that was carried out by the PiHe collaboration. Some future perspectives are brief…
View article: Report on scipost_202101_00002v2
Report on scipost_202101_00002v2 Open
A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium (π 4 He + ≡ π -+ 4 He 2+ + e -) atoms is presented.An infrared transition (n, ) = (17, 16)→(17, 15) at a resonance frequency of ν ≈…
View article: Report on scipost_202101_00002v1
Report on scipost_202101_00002v1 Open
A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium (π 4 He + ≡ π -+ 4 He 2+ + e -) atoms is presented.An infrared transition (n, ) = (17, 16)→(17, 15) at a resonance frequency of ν ≈…
View article: Realization of the optimal beam dilution pattern of the FCC-hh ring using beating frequencies
Realization of the optimal beam dilution pattern of the FCC-hh ring using beating frequencies Open
In order to avoid the damage of the dump target of the Future Circular Collider’s proton ring, the beam will be swept over its surface using dilution kickers oscillating in the x/y planes with 90 ∘ phase difference, and an amplitude changi…
View article: Dump Line Layout and Beam Dilution Pattern Optimization of the Future Circular Collider
Dump Line Layout and Beam Dilution Pattern Optimization of the Future Circular Collider Open
To avoid any damage to the beam dump target in the Future Circular Collider, the beam will be swept over its surface using oscillating kickers in the x/y planes with a 90-degree phase difference, and an amplitude changing in time, creating…
View article: Shielded Pair Method for Cylindrical Surface Resistance Measurement at Cryogenic Temperature
Shielded Pair Method for Cylindrical Surface Resistance Measurement at Cryogenic Temperature Open
The shielded pair resonator method was already used in the past at CERN to measure the surface resistivity of the LHC beam screen both at room temperature and cryogenic temperature. We have refined and adapted the measurement to be able to…
View article: Two-dimensional conceptual design of a superconducting iron-free opposite field septum magnet
Two-dimensional conceptual design of a superconducting iron-free opposite field septum magnet Open
A novel concept of a superconducting iron-free opposite field septum magnet is presented, which could provide a magnetic field jump of 1.4 T between its two domains, with a septum blade thickness of about 4 mm.
View article: Future circular collider injection and extraction kicker topologies and solid state generators
Future circular collider injection and extraction kicker topologies and solid state generators Open
A 100 TeV center-of-mass energy frontier proton collider, in a new tunnel of 80–100 km circumference, is a central part of CERN’s Future Circular Colliders (FCC) design study. The designs of the injection and extraction systems of the FCC …
View article: SPS Slow Extraction Losses and Activation: Update on Recent Improvements
SPS Slow Extraction Losses and Activation: Update on Recent Improvements Open
Annual high intensity requests of over 10¹⁹ protons on target (POT) from the CERN Super Proton Synchrotron (SPS) Fixed Target (FT) physics program continue, with the prospect of requests for even higher, unprecedented levels in the coming …
View article: NbTi/Nb/Cu Multilayer Shield for the Superconducting Shield (SuShi) Septum
NbTi/Nb/Cu Multilayer Shield for the Superconducting Shield (SuShi) Septum Open
A passive superconducting shield was proposed earlier to realize a high-field (3-4 T) septum magnet for the Future Circular Collider. This paper presents the experimental results of a potential shield material, a NbTi/Nb/Cu multilayer shee…
View article: Use of a Massless Septum to Increase Slow-Extraction Efficiency
Use of a Massless Septum to Increase Slow-Extraction Efficiency Open
The Super Proton Synchrotron (SPS) at CERN provides slow-extracted beam for Fixed Target experiments in the North Area. For the higher extracted beam intensities requested by future experimental proposals, beam-loss induced activation will…
View article: Optimization of Diffuser (Pre-Scatterer) Configurations for Slow Extraction Loss Reduction at Electrostatic Septa
Optimization of Diffuser (Pre-Scatterer) Configurations for Slow Extraction Loss Reduction at Electrostatic Septa Open
Uncontrolled beam loss at the electrostatic septum is a performance limit for several existing or planned high power hadron accelerators delivering slow-extracted spills to fixed targets. A passive diffuser, or pre-scatterer, in a suitable…
View article: High field septum magnet using a superconducting shield for the Future Circular Collider
High field septum magnet using a superconducting shield for the Future Circular Collider Open
A zero-field cooled superconducting shield is proposed to realize a high-field (3–4 T) septum magnet for the Future Circular Collider hadron-hadron (FCC-hh) ring. Three planned prototypes using different materials and technical solutions a…