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- 摘要
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- 实验方案
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Characterisation of Timepix3 with 3D sensor
摘要： Tests were performed at the SPS facilities at CERN using a 40 GeV/c pion beam with prototype 3D-Timepix3 detectors (3D detector). A planar-Timepix3 (planar detector) was placed along the beam axis together with the 3D detectors in a telescope arrangement for comparison and reference. We demonstrate that the combination of 3D-geometry silicon sensors and Timepix3 module can reduce the effect of charge sharing and lowers the carrier drift-time, while giving the same spectroscopy performance without sacrificing the timing or any performance advantages of the Timepix3 module.
关键词： Performance of High Energy Physics Detectors,databases),Detector control systems (detector and experiment monitoring and slow-control systems,hardware,algorithms,architecture
更新于2025-09-23 15:23:52
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Rays via Single-Shot Laser-Electron Interaction
摘要： Generation of circularly polarized (CP) and linearly polarized (LP) γ rays via the single-shot interaction of an ultraintense laser pulse with a spin-polarized counterpropagating ultrarelativistic electron beam has been investigated in nonlinear Compton scattering in the quantum radiation-dominated regime. For the process simulation, a Monte Carlo method is developed which employs the electron-spin-resolved probabilities for polarized photon emissions. We show efficient ways for the transfer of the electron polarization to the high-energy photon polarization. In particular, multi-GeV CP (LP) γ rays with polarization of up to about 95% can be generated by a longitudinally (transversely) spin-polarized electron beam, with a photon flux meeting the requirements of recent proposals for the vacuum birefringence measurement in ultrastrong laser fields. Such high-energy, high-brilliance, high-polarization γ rays are also beneficial for other applications in high-energy physics, and laboratory astrophysics.
关键词： nonlinear Compton scattering,electron-spin-resolved probabilities,high-energy physics,Monte Carlo method,circularly polarized γ rays,vacuum birefringence,quantum radiation-dominated regime,laboratory astrophysics,linearly polarized γ rays
更新于2025-09-23 15:19:57
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High energy proton micro-bunches from a laser plasma accelerator
摘要： Recent advances on laser-driven ion accelerators have sparked an increased interest in such energetic particle sources, particularly towards the viability of their usage in a breadth of applications, such as high energy physics and medical applications. Here, we identify a new ion acceleration mechanism and we demonstrate, via particle-in-cell simulations, for the first time the generation of high energy, monochromatic proton micro-bunches while witnessing the acceleration and self-modulation of the accelerated proton beam in a dual-gas target, consisting of mixed ion species. in the proposed ion acceleration mechanism due to the interaction of an ultra-short, ultra-intense (2 PW, 20 fs) laser pulses with near-critical-density partially ionized plasmas (C & H species), we numerically observed high energy monochromatic proton microbunches of high quality (peak proton energy 350 MeV, laser to proton conversion efficiency ~10?4 and angular divergence <10 degree), which can be of high relevance for medical applications. We envisage that through this scheme, the range of attained energies and the monochromaticity of the accelerated protons can be increased with existing laser facilities or allow for laser-driven ion acceleration investigations to be pursued at moderate energies in smaller scale laser laboratories, hence reducing the size of the accelerators. the use of mixed-gas targets will enable high repetition rate operation of these accelerators, free of plasma debris and electromagnetic pulse disruptions.
关键词： proton micro-bunches,laser-driven ion accelerators,medical applications,particle-in-cell simulations,high energy physics
更新于2025-09-16 10:30:52
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Multiple colliding laser pulses as a basis for studying high-field high-energy physics
摘要： Apart from maximizing the strength of optical electromagnetic fields achievable at high-intensity laser facilities, the collision of several phase-matched laser pulses has been identified theoretically as a trigger of and way to study various phenomena. These range from the basic processes of strong-field quantum electrodynamics to the extraordinary dynamics of the generated electron-positron plasmas. This has paved the way for several experimental proposals aimed at both fundamental studies of matter at extreme conditions and the creation of particle and radiation sources. Because of the unprecedented capabilities of such sources, they have the potential to open up new opportunities for experimental studies in nuclear and quark-gluon physics. We perform here a systematic analysis of different regimes and opportunities achievable with the concept of multiple colliding laser pulses, for both current and upcoming laser facilities. We reveal that several distinct regimes could be within reach of multi-petawatt laser facilities.
关键词： high-field high-energy physics,quantum electrodynamics,multiple colliding laser pulses,electron-positron plasmas,particle and radiation sources
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE International Symposium on Circuits and Systems (ISCAS) - Florence, Italy (2018.5.27-2018.5.30)] 2018 IEEE International Symposium on Circuits and Systems (ISCAS) - Design of a radiation-tolerant high-speed driver for Mach Zender Modulators in High Energy Physics
摘要： This paper presents the integrated circuit design, targeting a CMOS 65 nm 1.2 V technology, of a high-speed driver that provides the differential input signals to a Mach Zender Modulator (MZM), and allows tuning of the MZM operating point through adjustment of the bias voltage. A multi-voltage isolated domain circuit through deep n-well trenches, to face the high voltage swing and the bias regulation requirements of the MZM. The MZM device, whose prototype has been implemented in silicon photonics iSiPP50G technology, is emerging as a promising solution for radiation tolerant, several hundreds of Mrad, and high-speed, in the range of 10 Gbps, optical links. These stringent requirements are needed in high energy physics experiments in the upgrade of the Large Hadron Collider or in future Linear Colliders.
关键词： High-speed CMOS driver,Mach-Zender Modulator driving circuit,Radiation tolerance,High energy physics
更新于2025-09-11 14:15:04
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Polarized Positron Beams via Intense Two-Color Laser Pulses
摘要： The generation of ultrarelativistic polarized positrons during the interaction of an ultrarelativistic electron beam with a counterpropagating two-color petawatt laser pulse is investigated theoretically. Our Monte Carlo simulation, based on a semiclassical model, incorporates photon emissions and pair productions, using spin-resolved quantum probabilities in the local constant field approximation, and describes the polarization of electrons and positrons for the pair production and photon emission processes, as well as the classical spin precession in between. The main reason for the polarization is shown to be the spin asymmetry of the pair production process in strong external fields, combined with the asymmetry of the two-color laser field. Employing a feasible scenario, we show that highly polarized positron beams, with a polarization degree of ζ ≈ 60%, can be produced in a femtosecond timescale, with a small angular divergence, ～74 mrad, and high density, ～1014 cm?3. The laser-driven polarized positron source raises hope for providing an alternative for high-energy physics studies.
关键词： polarized positron beams,ultrarelativistic electron beam,local constant field approximation,spin-resolved quantum probabilities,high-energy physics,Monte Carlo simulation,two-color laser pulses
更新于2025-09-11 14:15:04
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Performance of active edge pixel sensors
摘要： To cope with the High Luminosity LHC harsh conditions, the ATLAS inner tracker has to be upgraded to meet requirements in terms of radiation hardness, pile up and geometrical acceptance. The active edge technology allows to reduce the insensitive area at the border of the sensor thanks to an ion etched trench which avoids the crystal damage produced by the standard mechanical dicing process. Thin planar n-on-p pixel sensors with active edge have been designed and produced by LPNHE and FBK foundry. Two detector module prototypes, consisting of pixel sensors connected to FE-I4B readout chips, have been tested with beams at CERN and DESY. In this paper the performance of these modules are reported. In particular the lateral extension of the detection volume, beyond the pixel region, is investigated and the results show high hit e?ciency also at the detector edge, even in presence of guard rings.
关键词： Particle tracking detectors,Large detector systems for particle and astroparticle physics,Performance of High Energy Physics Detectors
更新于2025-09-10 09:29:36
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Monte Carlo methods for TMD analyses
摘要： Monte Carlo simulations are an indispensable tool in experimental high-energy physics. Indeed, many discoveries rely on realistic modeling of background processes. In the field of transverse-momentum-dependent parton distribution and fragmentation functions there is a clear lack of a reliable Monte Carlo physics generator that can be used in experimental and phenomenological analyses. The need for such Monte Carlo generators, the status of some solutions and prospects are discussed.
关键词： Monte Carlo simulations,fragmentation functions,transverse-momentum-dependent parton distribution,high-energy physics
更新于2025-09-10 09:29:36
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Encyclopedia of Spectroscopy and Spectrometry || Accelerator Mass Spectrometry (AMS)
摘要： Accelerator mass spectrometry (AMS) was developed for analyzing 14C in environmental and archeological specimens in the 1970s (although it was first demonstrated in the 1930s). It is now principally used to measure only a handful of isotopes, although it is feasible to apply it to many additional analytes. AMS represents the marriage of high-energy physics with radioanalytical chemistry and finds applications in geoscience, environmental analysis, archeology, cosmochemistry, biosciences, medicine, material science, nuclear chemistry, and physics. AMS employs a high-energy tandem accelerator to raise ion energies to the mega-electron-volt (MeV) range and enable complete destruction and avoidance of isobaric interferences. Typical AMS is thus capable of measuring very small isotope ratios, typically in the range of 10^-15 (atomic ratio). Isotopes of interest include 14C, 10Be, 26Al, 36Cl, 41Ca, and 129I. Measured rare/natural ratios for these isotopes fall well below the 1–10^-9 range measured with other mass spectrometers (except for laser-based systems with resonance ionization techniques, which can match the range of the AMS).
关键词： radioanalytical chemistry,AMS,high-energy physics,isotopes,Accelerator Mass Spectrometry
更新于2025-09-04 15:30:14
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The Phase1 CMS Pixel detector upgrade
摘要： The pixel detector of the CMS experiment will be replaced in an extended end-of-year shutdown during winter 2016/2017 with an upgraded one able to cope with peak instantaneous luminosities beyond the nominal LHC instantaneous luminosity of 1 × 1034 cm?2 s?1. Under the conditions expected in the coming years, which will see an increase of a factor two in instantaneous luminosity, the present system would experience a dynamic ine?ciency caused mainly by data losses due to bu?er over?ows. The Phase I upgrade of the CMS pixel detector, described in this paper, will operate at full e?ciency at an instantaneous luminosity of 2 × 1034 cm?2 s?1 and beyond, thanks to a new readout chip. The new detector will feature one additional tracking point both in the barrel and in the forward regions, while reducing the material budget as a result of a new CO2 cooling system and optimised layout of the services. In this paper, the design and the technological choices of the Phase I detector will be reviewed and the status of the construction of the detector and the performance of its components will be discussed.
关键词： Particle tracking detectors,Radiation-hard detectors,Performance of High Energy Physics Detectors,Si microstrip and pad detectors
更新于2025-09-04 15:30:14