Daniele Mirarchi
A5063049508- Particle Accelerators and Free-Electron Lasers
- Crystallography and Radiation Phenomena
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Particle accelerators and beam dynamics
- Nuclear materials and radiation effects
- High-Energy Particle Collisions Research
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Geophysical Methods and Applications
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- Ion-surface interactions and analysis
- Nuclear Physics and Applications
- Advanced Electron Microscopy Techniques and Applications
- Graphite, nuclear technology, radiation studies
- Electron and X-Ray Spectroscopy Techniques
- Optical Systems and Laser Technology
- Microstructure and mechanical properties
- Calibration and Measurement Techniques
- X-ray Diffraction in Crystallography
- Spectroscopy Techniques in Biomedical and Chemical Research
- Astrophysics and Cosmic Phenomena
European Organization for Nuclear Research
2016-2025
University of Manchester
2020-2021
Cockcroft Institute
2021
Brookhaven National Laboratory
2020
GANIL
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2010-2017
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2017
Kurchatov Institute
2017
Two high-accuracy goniometers equipped with two bent silicon crystals were installed in the betatron cleaning insertion of CERN Large Hadron Collider (LHC) during its long shutdown. First beam tests recently performed at LHC 450 GeV/c and 6500 stored proton beams to investigate feasibility halo collimation assisted by crystals. For first time channeling protons was observed a particle accelerator. A strong reduction losses due nuclear inelastic interactions aligned crystal comparison...
Abstract The TOTEM experiment at the LHC has performed first measurement $$\sqrt{s} = 13\,\mathrm{TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mspace /><mml:mi>TeV</mml:mi></mml:mrow></mml:math> of $$\rho $$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ρ</mml:mi></mml:math> parameter, real to imaginary ratio nuclear elastic scattering amplitude $$t=0$$...
The CERN Large Hadron Collider (LHC) is designed to collide proton beams of unprecedented energy, in order extend the frontiers high-energy particle physics. During first very successful running period 2010--2013, LHC was routinely storing protons at 3.5--4 TeV with a total beam energy up 146 MJ, and even higher stored energies are foreseen future. This puts extraordinary demands on control losses. An un-controlled loss tiny fraction could cause superconducting magnet undergo transition into...
The concept of crystal collimation relies on the use bent crystals to coherently deflect positively charged particles with suitable impact conditions by trapping them in potential well generated adjacent crystalline planes. resulting deflection is much higher than what can be achieved multiple scattering amorphous materials. For this reason, technique has been explored past decades for applications particle accelerators. In particular, a full test stand was installed betatron insertion Large...
Efficient steering of particle beams in accelerators by means bent crystals has been pursued over the last decades. Recent achievements their operational deployment at CERN resulted a renewed interest exploitation for advanced accelerator and high energy physics concepts. Efforts to date have focused on establishing planar channeling, given intrinsic complexity process. However, know-how developed with operation Large Hadron Collider allowed this be pushed step further, demonstrating that...
A study of crystal assisted collimation has been continued at the CERN SPS for different energies stored beams using 120 GeV/c and 270 protons Pb ions with per charge. bent silicon used as a primary collimator deflected halo particles channeling directing them into tungsten absorber. strong correlation beam losses in off-momentum intensity measured first high dispersion (HD) area downstream was observed. In conditions, loss rate induced by inelastic interactions nuclei is significantly...
The TOTEM experiment at the LHC has performed first measurement $\sqrt{s} = 13$ TeV of $ρ$ parameter, real to imaginary ratio nuclear elastic scattering amplitude $t=0$, obtaining following results: $ρ= 0.09 \pm 0.01$ and 0.10 0.01$, depending on different physics assumptions mathematical modelling. unprecedented precision measurement, combined with total cross-section measurements in an energy range larger than 10 (from 2.76 13 TeV), implied exclusion all models classified published by...
A setup of two bent crystals and a fixed target in the CERN Large Hadron Collider (LHC) could enable study magnetic (MDM) electric (EDM) dipole moments short-lived charm baryons with unprecedented accuracy. At core experiment is crystal which particles interest, such as $\Lambda_c^+$ $\Xi_c^+$ particles, can be confined between crystalline planes, inducing deflection that enforces spin precession measurable by detectors. The requires inside LHC vacuum to create charmed baryons. first serves...
The Large Hadron Collider (LHC) at CERN is built to collide intense proton beams with an unprecedented energy of 7 TeV. design stored per beam 362 MJ makes the LHC highly destructive, so that any losses risk cause quenches superconducting magnets or damage accelerator components. Collimators are installed protect machine and they define a minimum normalized aperture, below which no other element allowed. This imposes limit on achievable luminosity, since when squeezing β* (the β-function...
The results of observation and studies focusing 400 GeV/c proton beam with the help bent single crystals are presented. Two silicon have been used in measurements. focal length first second is found to be 1.48 m 0.68 m, respectively. mean square size horizontal profile focus was 3.1 4.3 times as small at exit crystals.
Bent silicon crystals mounted on high-accuracy angular actuators were installed in the CERN Super Proton Synchrotron (SPS) and extensively tested to assess feasibility of crystal-assisted collimation circular hadron colliders. The adopted layout was exploited regularly upgraded for about a decade by UA9 Collaboration. investigations provided compelling evidence strong reduction beam losses induced nuclear inelastic interactions aligned comparison with amorphous orientation. A conceptually...
Channeling is the confinement of trajectory a charged particle in crystalline solid. Positively particles channeled between crystal planes oscillate with certain oscillation length, which depends on energy. A whose thickness half length for planar channeling may act as mirror particles. If incident angle plane less than critical channeling, under-barrier undergo an and exit reversal their transverse momentum, i.e., are "mirrored" by planes. Unlike traditional scheme relying millimeter-long...
The data produced at the particle physics experiments Large Hadron Collider (LHC) contain not only signals from collisions, but also a background component proton losses around accelerator. Understanding, identifying and possibly mitigating this machine-induced is essential for an efficient taking, especially some new searches. Among sources of are hadronic electromagnetic showers on nearby collimators due to beam-halo cleaning. In article, first dedicated LHC measurements type presented....
During Long Shutdown 1, 18 Large Hadron Collider (LHC) collimators were replaced with a new design, in which beam position monitor (BPM) pick-up buttons are embedded the collimator jaws. The BPMs provide direct measurement of orbit at collimators, and therefore can be used to align more quickly than using standard technique relies on feedback from losses. Online measurements also allow for reducing operational margins collimation hierarchy placed specifically cater unknown drifts, decreasing...
In ideal two-stage collimation systems, the secondary collimator–absorber should have its length sufficient to exclude practically exit of halo particles with large impact parameters. UA9 experiments on crystal assisted SPS beam a 60 cm long tungsten bar is used as which insufficient for full absorption protons. Multi-turn simulation studies allowed select position loss monitor downstream area where contribution deflected by in channeling regime but emerging from considerably reduced. This...
This paper is devoted to an experimental study of focusing and defocusing positively charged particle beams with the help specially bent single crystals. Four crystals have been fabricated for this purpose. The studies performed at CERN SPS in $400\text{ }\text{ }\mathrm{GeV}/c$ proton $180\text{ pion beams. results measurements beam envelopes are presented. rms size horizontal profile focus was 5--8 times smaller than exit measured focal lengths were 4--21 m. good agreement calculations....
A deflection efficiency of about 61% was observed for 400 GeV/c protons due to channeling, most strongly along the 〈110〉 axis a bent silicon crystal. It is comparable with in planar channeling and considerably larger than case 〈111〉 axis. The measured probability inelastic nuclear interactions only 10% its amorphous level whereas (110) planes it 25%. High small beam losses make this axial orientation crystal useful tool steering high energy charged particles.
The UA9 experimental equipment was installed in the CERN-SPS March '09 with aim of investigating crystal assisted collimation coasting mode. Its basic layout comprises silicon bent crystals acting as primary collimators mounted inside two vacuum vessels. A movable 60 cm long block tungsten located downstream at about 90 degrees phase advance intercepts deflected beam. Scintillators, Gas Electron Multiplier chambers and other beam loss monitors measure nuclear rates induced by interaction...
Within UA9 Collaboration bent silicon crystals has been irradiated by 400 GeV proton beams at the H8 line of CERN SPS North Area. Proton–crystal interactions were investigated analyzing particle trajectories hitting crystal. 26 tested and 10 them used to extract key crystal properties, such as bending angle, channeling efficiency so on. A statistical analysis results is presented. The provide experimental data be for an exhaustive comparison with simulation routines.