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Superconducting magnets technology for a European heavy ion gantry
/ Prioli, Marco (LASA, Segrate) ; Santini, Carlo (LASA, Segrate) ; Barna, Daniel (Wigner RCP, Budapest) ; Gusvitskii, Todor (Rome U.) ; Perini, Diego (CERN) ; Bianchi, E (INFN, Genoa) ; Felcini, Enrico (CNAO, Milan) ; De Matteis, Ernesto (LASA, Segrate) ; Toral, Fernando (Madrid, CIEMAT) ; Levi, Filippo (INFN, Genoa) et al.
Various initiatives in Europe have been launched to study superconducting magnets for a rotatable gantry suitable to deliver up to 430 MeV/u carbon ions for hadron therapy. Different technologies and layouts are being considered: the baseline solution is developed within the EuroSIG collaboration and consists of a strongly curved cos-$\theta$ dipole based on the classical NbTi superconductor. [...]
2024 - 5 p.
- Published in : JACoW IPAC 2024 (2024) WEXN1
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.WEXN1
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Magnet technology and design of superconducting magnets for heavy ion gantry for hadron therapy
/ Lecrevisse, T (IRFU, Saclay) ; Kirby, G (CERN) ; Rossi, Lucio (Milan U. ; INFN, Milan) ; Carloni, Anna Giulia (INFN, Milan) ; Barna, Daniel (Wigner RCP, Budapest) ; Tommasini, Davide (CERN) ; Gautheron, Emma (CERN) ; Felcini, Enrico (CNAO, Milan) ; De Matteis, Ernesto (INFN, Milan) ; Prioli, Marco (INFN, Milan) et al.
Various initiatives in Europe have bene launched to study superconducting magnets for a rotatable gantry suitable for delivery up to 440 MeV/A carbon ions for hadron therapy. One initiative is led by INFN inside an agreement with CERN, CNAO and MedAustron aiming at designing and manufacturing a strongly curved costheta dipole (Rbending = 1.6 m) rated for 4 T central field and a ramp rate of 0.15-0.4 T/s. [...]
2023
- Published in : JACoW IPAC 2023 (2023) THPM041
Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.THPM041
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Dielectric resonator to measure surface resistance of accelerator components at room temperature and 77 K
/ Brunner, Kristóf (CERN) ; Krkotić, Patrick (CERN) ; Pinto, Pedro Costa (CERN) ; Diaz-Rato, Eduardo Gibbons (CERN) ; Pfeiffer, Stephan (CERN) ; Vollenberg, Wilhelmus (CERN) ; Calatroni, Sergio (CERN) ; Barna, Dániel (Wigner RCP, Budapest) ; Pont, Montse (CELLS - ALBA, LLS) ; O'Callaghan, Joan (Barcelona, Polytechnic U.)
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 CERN. Measurements were done at room temperature as well as at liquid nitrogen temperature (77 K) by means of a novel large dielectric resonator operating at 3.4 GHz. [...]
2023 - 8 p.
- Published in : Phys. Rev. Accel. Beams 26 (2023) 083101
Fulltext: PDF;
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Recent progress of laser spectroscopy measurements of pionic helium
/ Hori, Masaki (Munich, Max Planck Inst. Quantenopt. ; Munich U.) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt.) ; Dax, Andreas (PSI, Villigen) ; Barna, Dániel (CERN)
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 briefly discussed..
2022 - 8 p.
- Published in : EPJ Web Conf. 262 (2022) 01004
Fulltext: PDF;
In : 7th International Conference on Exotic Atoms and Related Topics, Online, 13 - 17 Sep 2021, pp.01004
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Dump Line Layout and Beam Dilution Pattern Optimization of the Future Circular Collider
/ Facskó, Benedek (Wigner RCP, Budapest) ; Barna, Daniel (Wigner RCP, Budapest) ; Lechner, Anton (CERN) ; Renner, Elisabeth (CERN)
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 a spiral pattern. The ideal pattern must have an increasing spiral pitch towards smaller radii to produce an even energy deposition density. [...]
Geneva : JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 3815-3818
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.3815-3818
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High-resolution laser resonances of antiprotonic helium in superfluid $^{4}$He
/ Sótér, Anna (Munich, Max Planck Inst. Quantenopt. ; Zurich, ETH) ; Aghai-Khozani, Hossein (Munich, Max Planck Inst. Quantenopt.) ; Barna, Dániel (CERN ; Wigner RCP, Budapest) ; Dax, Andreas (CERN ; PSI, Villigen) ; Venturelli, Luca (U. Brescia ; INFN, Pavia) ; Hori, Masaki (Munich, Max Planck Inst. Quantenopt. ; Munich U.)
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 million, obscuring spectroscopic structures and preventing high-resolution spectroscopy, even when superfluid helium, which is the most transparent, cold and chemically inert liquid, is used as the host material. [...]
2022 - 14 p.
- Published in : Nature 603 (2022) 411-415
Fulltext: PDF; External link: Interactions.org article
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Shielded Pair Method for Cylindrical Surface Resistance Measurement at Cryogenic Temperature
/ Brunner, Kristóf (CERN ; Wigner RCP, Budapest) ; Barna, Daniel (Wigner RCP, Budapest) ; Calatroni, Sergio (CERN) ; Caspers, Fritz (CERN)
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 measure other types of beam screens and also to operate in a strong dipolar magnetic field. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 1132-1135
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.1132-1135
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Recent results of laser spectroscopy experiments of pionic helium atoms at PSI
/ HORI, Masaki (Munich, Max Planck Inst. Quantenopt.) ; Aghai-Khozani, H (Munich, Max Planck Inst. Quantenopt.) ; Sótér, Anna (Munich, Max Planck Inst. Quantenopt.) ; Dax, Andreas (PSI, Villigen) ; Barna, Daniel (CERN)
A review of a recent experiment carried out at PSI involving laser spectroscopy of metastable pionic helium $(\pi^4\textrm{He}^+ \equiv \pi^- + ^4\textrm{He}^{2+}+e^-)$ atoms is presented. An infrared transition $(n, \ell ) = (17,16) \to (17, 15)$ at a resonance frequency of $\nu \approx 183760$ GHz was detected..
2021 - 11 p.
- Published in : SciPost Phys. Proc. 5 (2021) 026
Fulltext: PDF;
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Realization of the optimal beam dilution pattern of the FCC-hh ring using beating frequencies
/ Barna, Dániel (Wigner RCP, Budapest ; Miskolc U.) ; Facskó, Benedek (Wigner RCP, Budapest) ; Lechner, Anton (CERN) ; Renner, Elisabeth (CERN)
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 changing with time, thereby creating a spiral-like pattern. The natural time-dependence of the amplitude is the exponential decay of a damped oscillating circuit, which results in a decreasing pitch, and thereby increasing energy deposition density towards small radii. [...]
2021 - 8 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 992 (2021) 165048
Fulltext: PDF;
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