CERN Accelerating science

Accelerator Physics

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2024-12-20
12:11
Long-range beam-beam mitigation for round optics / Fartoukh, Stephane (CERN) ; Kostoglou, Sofia (CERN)
When colliding high intensity bunch trains at low beta*, a sufficiently large crossing angle needs to be imposed at the interaction point (IP) in order to separate the two beams before and after the collision, and mitigate the so-called long-range beam-beam (BBLR) effect, which otherwise can be very detrimental to the beam lifetime. [...]
CERN-ACC-NOTE-2023-0029.
- 2023

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2024-12-19
05:10
Development of self-modulation as a function of plasma length / Clairembaud, Arthur (Munich, Max Planck Inst. ; Munich, Tech. U.) ; Turner, Marlene (CERN) ; Muggli, Patric (Munich, Max Planck Inst.)
We use numerical simulations to determine whether the saturation length of the self-modulation (SM) instability of a long proton bunch in plasma could be determined by measuring the radius of the bunch halo SM produces. [...]
arXiv:2412.12922.
- 13.
Fulltext

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2024-12-11
06:11
A Novel Method for Transverse Beam-Coupling Impedance Measurements in Particle Accelerator Devices Using the Bead-Pull Method / Antuono, Chiara (U. Rome La Sapienza (main) ; CERN) ; Sito, Leonardo (CERN ; Naples U.) ; Calzone, Eleonora (U. Rome La Sapienza (main) ; CERN) ; el Dali, D (CERN) ; Migliorati, Mauro (CERN ; U. Rome La Sapienza (main)) ; Mostacci, Andrea (CERN ; U. Rome La Sapienza (main)) ; Fienga, Francesco (CERN ; Naples U.) ; Marrazzo, Vincenzo Romano (CERN ; Naples U.) ; Breglio, Giovanni (CERN ; Naples U.) ; Rumolo, G (CERN) et al.
In high-energy particle accelerators, circulating particle beams with high intensity interact electromagnetically with their surroundings (i.e., metallic vacuum chambers of various geometries). These electromagnetic interactions, which are typically described through the concept of beam-coupling impedance, can represent a serious issue in terms of stability of the particle beam and heating on the accelerator structures. [...]
2024 - 9 p. - Published in : IEEE Trans. Instrum. Meas. 73 (2024) 8005209 Fulltext: PDF;

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2024-12-10
05:13
Development and commissioning of ion-optical elements for ion and antiproton beams with energies up to 5 keV / Klink, Clara (Darmstadt, Tech. U. ; CERN) ; Schlaich, Moritz (Darmstadt, Tech. U.) ; Fischer, Jonas (Darmstadt, Tech. U.) ; Obertelli, Alexandre (Darmstadt, Tech. U.) ; Schmidt, Alexander (Darmstadt, Tech. U.) ; Wienholtz, Frank (Darmstadt, Tech. U.)
In nuclear and atomic physics experiments, charged ion beams often need to be guided from the ion production to the experimental site. In the PUMA experiment, an ion source beamline was developed, which can be operated with up to \SI5{\kilo\electronvolt} beam energy at a base pressure of $10^{-9}$ mbar or better. [...]
arXiv:2410.18724.- 2024-11-15 - 22 p. - Published in : JINST 19 (2024) T11009 Fulltext: 2410.18724 - PDF; Publication - PDF;

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2024-12-02
12:20
Optics Measurements with the Transverse Damper in the Large Hadron Collider / Nissinen, Tuuli
Effective control of beam optics is critical for achieving the luminosity targets in particle colliders such as the Large Hadron Collider (LHC) [...]
CERN-THESIS-2024-245 - 2024 - 67.


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2024-11-30
06:10
Precision luminosity measurement at hadron colliders / Wanczyk, Joanna Malgorzata
This thesis links two realms of particle accelerator dynamics and precision particle physics [...]
2024 - 171.


10.5075/epfl-thesis-10500

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2024-11-29
16:54
Design and optimization of higher order mode couplers for the superconducting cavities of the PERLE energy recovery Linac / Barbagallo, Carmelo
The Powerful Energy Recovery Linac for Experiments (PERLE) is an energy recovery linac (ERL) facility based on superconducting radio-frequency (SRF) technology to be hosted at the Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab) in France [...]
CERN-THESIS-2024-244 - 2024 - 270.


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2024-11-28
06:06
Mitigation Strategies for the Instabilities Induced by the Fundamental Mode of the HL-LHC Crab Cavities / Giacomel, Lorenzo (CERN) ; Baudrenghien, Philippe (CERN) ; Buffat, Xavier (CERN) ; Calaga, Rama (CERN) ; Mounet, Nicolas (CERN)
The transverse impedance is one of the potentially limiting effects for the performance of the High-Luminosity Large Hadron Collider (HL-LHC). In the current LHC, the impedance is dominated by the resistive-wall contribution of the collimators at typical bunch-spectrum frequencies, and is of broad-band nature. [...]
2024 - 4 p. - Published in : JACoW HB 2023 (2024) 571-574 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.571-574

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2024-11-20
04:03
Measurement of the emittance of accelerated electron bunches at the AWAKE experiment / AWAKE Collaboration
The vertical plane transverse emittance of accelerated electron bunches at the AWAKE experiment at CERN has been determined, using three different methods of data analysis. [...]
arXiv:2411.08681.
- 20.
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2024-11-13
09:35
710 kW stable average-power in a 45,000 finesse two-mirror optical cavity / Lu, Xin-Yi (Tsinghua University) ; Martens, Aurelien (Université Paris-Saclay (FR))
Very-high average optical enhancement cavities are be- ing used both in fundamental and applied research. The most demanding applications require stable megawatt level average power of infrared picosecond pulses with repetition rates of several tens of MHz. [...]
CERN-PBC-Notes-2024-005.- Geneva : CERN, 2024 - 4. Fulltext: PDF;

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