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1.
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High intensity beam dynamics assessment and challenges for HL-LHC
/ Rumolo, G (CERN) ; Salvant, B (CERN) ; Mounet, N (CERN) ; Tomás, R (CERN) ; Bartosik, H (CERN) ; Baudrenghien, P (CERN) ; Bruce, R (CERN) ; Buffat, X (CERN) ; Calaga, R (CERN) ; De Maria, R (CERN) et al.
The High Luminosity (HL-LHC) project aims to increase the integrated luminosity of CERN’s Large Hadron Collider (LHC) by an order of magnitude compared to its initial design. This requires a large increase in bunch intensity and beam brightness compared to the first LHC runs, and hence poses serious collective-effects challenges, related in particular to electron cloud, instabilities from beam-coupling impedance, and beam-beam effects. [...]
2024 - 7 p.
- Published in : JINST
- Published in : JACoW HB: 2023 (2024) , pp. 344-350
Fulltext: PublicationJACoW - PDF; PublicationIOP - PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.T05016
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2.
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Recent advances in the CERN PS impedance model and instability simulations following the LHC Injectors Upgrade project
/ Joly, S (Rome U. ; CERN) ; Oeftiger, A (Darmstadt, GSI) ; Iadarola, G (CERN) ; Zannini, C (CERN) ; Migliorati, M (Rome U.) ; Mounet, N (CERN) ; Salvant, B (CERN)
Transverse instability growth rates in the CERN ProtonSynchrotron (PS) are studied thanks to the recently updatedimpedance model of the machine. Using this model, macroparticletracking simulations were performed with a new method well-suitedfor the slicing of short wakes, which achieves comparableperformance to the originally implemented method while reducing therequired number of slices by a factor of 5 to 10. [...]
2024 - 24 p.
- Published in : JINST 19 (2024) P04018
Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.P04018
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3.
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Mitigation strategies for the instabilities induced by the fundamental mode of the HL-LHC Crab Cavities
/ Giacomel, L (CERN) ; Baudrenghien, P (CERN) ; Calaga, R (CERN) ; Buffat, X (CERN) ; Mounet, N (CERN)
The transverse impedance is one of the potentially limitingeffects for the performance of the High-Luminosity Large HadronCollider (HL-LHC). In the current LHC, the impedance is dominatedby the resistive-wall contribution of the collimators at typicalbunch-spectrum frequencies, and is of broad-bandnature. [...]
2024 - 14 p.
- Published in : JINST 19 (2024) P05046
Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.P05046
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4.
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Ultra narrowband detection scheme for dark photon / axion around 30 GHz
/ Miyazaki, A (Uppsala U.) ; Lofnes, T (Uppsala U.) ; Caspers, F (ESI, Archamps ; CERN) ; Spagnolo, P (INFN, Pisa) ; Jelonnek, J (KIT, Karlsruhe) ; Ruess, T (KIT, Karlsruhe) ; Steinmann, J L (KIT, Karlsruhe) ; Thumm, M (KIT, Karlsruhe)
We demonstrated that ultra narrowband filtering at 30 GHz dramatically enhances the signal-to-noise ratio to search for dark matter candidates which couple to millimeter waves. [...]
2022. - 1 p.
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5.
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Progress on HTS Undulator Prototype Coils for Compact FEL Designs
/ Richter, S C (CERN ; KIT, Karlsruhe) ; Ballarino, A (CERN) ; Schoerling, D (CERN) ; Nes, T H (CERN) ; Bernhard, A (KIT, Karlsruhe, IKP) ; Müller, A S (KIT, Karlsruhe)
Compact free-electron lasers require short accelerator structures followed by high peak field and short-period undulators to produce coherent radiation up to hard X-rays. Likewise, future lepton colliders, like CLIC or FCC-ee, require high-field damping wigglers for the creation of low emittance beams. [...]
2022 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4100305
In : 15th European Conference on Applied Superconductivity (EUCAS 2021), Online, 5 - 9 Sep 2021, pp.4100305
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6.
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High-Temperature Superconducting Undulator Prototype Coils for Compact Free-Electron Lasers
/ Richter, S C (CERN ; KIT, Karlsruhe) ; Ballarino, A (CERN) ; Bernhard, A (KIT, Karlsruhe) ; Grau, A W (KIT, Karlsruhe) ; de Jauregui, D Saez (KIT, Karlsruhe) ; Müller, A S (KIT, Karlsruhe)
Short-period and high-field undulators are crucial for the production of coherent light up to X-rays in compact free-electron lasers (FELs). Besides, future colliders like CLIC or FCC-ee demand high-field damping wigglers to reach a low beam emittance. [...]
2023 - 7 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4100207
In : Applied Superconductivity Conference, Honolulu, Hawaii, United States, 23 - 28 Oct 2022
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7.
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8.
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Spectral purification of single-frequency Stokes pulses in doubly resonant integrated diamond resonators
/ Granados, Eduardo (CERN) ; Stoikos, Georgios (CERN) ; Stoikos, Georgios (Natl. Tech. U., Athens)
Pulsed spectrally pure light is required for applications in high-resolution spectroscopy, optical coherent communications, and quantum technologies. In this work, we report on the efficient generation of high peak power, single-frequency, and tunable nanosecond pulses utilizing stimulated scattering, with an increased spectral brightness by exploiting double resonances in an integrated diamond Raman resonator. [...]
2022 - 4 p.
- Published in : Opt. Lett.: 47 (2022) , no. 16, pp. 3976-3979
- Published in : Opt. Lett.: 48 (2023) , no. 2, pp. 497
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9.
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Stability limits with Landau damping in the FCC-hh
/ Astapovych, D (Darmstadt, Tech. Hochsch.) ; Boine-Frankenheim, O (Darmstadt, Tech. Hochsch. ; Darmstadt, GSI) ; Gubaidulin, V (Darmstadt, Tech. Hochsch.) ; Kornilov, V (Darmstadt, GSI) ; Niedermayer, U (Darmstadt, Tech. Hochsch.) ; Schulte, D (CERN)
The resistive wall impedance is one of the expected main drivers of transverse beam instabilities in the proposed Future Circular Collider hadron-hadron option (FCC-hh). We obtain the resistive wall impedance for the FCC-hh beam screen from a two-dimensional finite element solver. [...]
2021 - 21 p.
- Published in : JINST 16 (2021) P01013
Fulltext: PDF;
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10.
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First measurement of the $|t|$-dependence of coherent J/$\psi$ photonuclear production
/ ALICE Collaboration
The first measurement of the dependence on $|t|$, the square of the momentum transferred between the incoming and outgoing target nucleus, of coherent J/ψ photoproduction is presented. The data were measured with the ALICE detector in ultra-peripheral Pb-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}} = 5.02$ TeV with the J/$\psi$ produced in the central rapidity region $|y| < 0.8$, which corresponds to the small Bjorken-$x$ range $(0.3 − 1.4) \times 10 ^{−3}$. [...]
arXiv:2101.04623; CERN-EP-2021-003.-
Geneva : CERN, 2021-06-10 - 21 p.
- Published in : Phys. Lett. B 817 (2021) 136280
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: PDF;
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