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1. Laboratory tests for MIR light detection and transport with specialty optical fibres

Author

Roberto Benocci, M. Rossella, M. Baruzzo, Humberto Cabrera, K. S. Gadedjisso-Tossou, M. Consonni, M. Bonesini, L. Stoychev, J.J. Suarez-Vargas, Benocci, R, Bonesini, M, Gadedjisso-Tossou, K, Cabrera, H, Stoychev, L, Rossella, M, Baruzzo, M, Consonni, M, and Suarez-Vargas, J

Subjects
sources, Optical fiber, Materials science, Proton, Physics::Instrumentation and Detectors, Physics::Optics, FOS: Physical sciences, Electron, Applied Physics (physics.app-ph), Radiation, 01 natural sciences, Electromagnetic radiation, 030218 nuclear medicine & medical imaging, law.invention, 03 medical and health sciences, 0302 clinical medicine, Optics, law, 0103 physical sciences, Detector alignment and calibration methods (lasers, Lasers, particle-beams), Photon detectors for UV, visible and IR photons (solid-state), Detector alignment and calibration methods, Lasers, Optics, particle-beams, Photon detectors for UV, sources, visible and IR photons (solid-state), Instrumentation, Mathematical Physics, Muon, 010308 nuclear & particles physics, business.industry, Physics - Applied Physics, Laser, Optical cavity, business, Physics - Optics, Optics (physics.optics)
Abstract

The FAMU (Fisica degli Atomi Muonici) experiment at the RIKEN RAL pulsed muon facility will measure the proton Zemach radius with high precision, thus contributing to the solution of the so-called "proton radius puzzle". The situation is now confused and new measurements will help reduce the discrepancy as measured with electrons or muons. To this aim, FAMU will make use of a high-intensity pulsed muon beam at RIKEN-RAL impinging on a cryogenic hydrogen target and a tunable Mid-infrared (MIR) laser emitting at about 6.78 μm, to measure the hyperfine (HFS) splitting of the 1S state of muonic hydrogen. The injection of light into the cryogenic target and its monitoring via dedicated MIR sensors is an asset for the experiment. A possible solution is via specialty MIR fibres based on hollow core waveguides or polycrystalline fibres. Two dedicated setups based on pulsed QCL lasers, from Alpes Laser, emitting around 6.78 μm have been used to study the fibre attenuation while the high energy laser specifically developed for the FAMU project has been used to study the damage threshold at high energies. The alignment of MIR laser radiation into an optical cavity presents criticalities due to geometrical constraints. Its control requires the use of small and sensitive detectors. The results obtained with a quantum IR sensor with an integrated circuit for signal processing are reported.

Published
2020

2. The FAMU experiment: muonic hydrogen high precision spectroscopy studies

Author

Joseph Niemela, E. Vallazza, Alessandro Menegolli, Giuseppe Baldazzi, Eugenio Fasci, V. Bonvicini, F. Fuschino, E. Furlanetto, Massimiliano Clemenza, R. Mazza, Barbara Patrizi, R. Sarkar, M. Citossi, P. J. C. King, D. Cirrincione, L. Stoychev, Humberto Cabrera, D. Guffanti, R. Bertoni, C. De Vecchi, A. Pullia, A. de Bari, K. Ishida, M. Baruzzo, Roberta Ramponi, C. Xiao, K. S. Gadedjisso-Tossou, Angela Pirri, P. Danev, Miltcho B. Danailov, H. E. Roman, A. Vacchi, Dimitar Bakalov, M. Stoilov, Gianluca Morgante, L. Colace, M. Rossella, C. Pizzolotto, Livio Gianfrani, L. Tortora, Valter Maggi, Guido Toci, A. Sbrizzi, Luigi Moretti, M. Bonesini, E. Mocchiutti, Andrzej Adamczak, M. Vannini, J. J. Suárez-Vargas, Adrian D. Hillier, Roberto Benocci, G. Zampa, M. De Vincenzi, L. P. Rignanese, Claudio Labanti, F. Chignoli, Pizzolotto, C., Adamczak, A., Bakalov, D., Baldazzi, G., Baruzzo, M., Benocci, R., Bertoni, R., Bonesini, M., Bonvicini, V., Cabrera, H., Cirrincione, D., Citossi, M., Chignoli, F., Clemenza, M., Colace, L., Danailov, M., Danev, P., de Bari, A., De Vecchi, C., de Vincenzi, M., Fasci, E., Furlanetto, E., Fuschino, F., Gadedjisso-Tossou, K. S., Gianfrani, L., Guffanti, D., Hillier, A. D., Ishida, K., King, P. J. C., Labanti, C., Maggi, V., Mazza, R., Menegolli, A., Mocchiutti, E., Moretti, L., Morgante, G., Niemela, J., Patrizi, B., Pirri, A., Pullia, A., Ramponi, R., Rignanese, L. P., Roman, H. E., Rossella, M., Sarkar, R., Sbrizzi, A., Stoilov, M., Stoychev, L., Suarez-Vargas, J. J., Toci, G., Tortora, L., Vallazza, E., Vannini, M., Xiao, C., Zampa, G., Vacchi, A., Suárez-Vargas, J. J., Pizzolotto, C, Adamczak, A, Bakalov, D, Baldazzi, G, Baruzzo, M, Benocci, R, Bertoni, R, Bonesini, M, Bonvicini, V, Cabrera, H, Cirrincione, D, Citossi, M, Chignoli, F, Clemenza, M, Colace, L, Danailov, M, Danev, P, de Bari, A, De Vecchi, C, de Vincenzi, M, Fasci, E, Furlanetto, E, Fuschino, F, Gadedjisso-Tossou, K, Gianfrani, L, Guffanti, D, Hillier, A, Ishida, K, King, P, Labanti, C, Maggi, V, Mazza, R, Menegolli, A, Mocchiutti, E, Moretti, L, Morgante, G, Niemela, J, Patrizi, B, Pirri, A, Pullia, A, Ramponi, R, Rignanese, L, Roman, H, Rossella, M, Sarkar, R, Sbrizzi, A, Stoilov, M, Stoychev, L, Suarez-Vargas, J, Toci, G, Tortora, L, Vallazza, E, Vannini, M, Xiao, C, Zampa, G, and Vacchi, A

Subjects
X-ray detector, Physics, Nuclear and High Energy Physics, Muon, Proton, 010308 nuclear & particles physics, hyperfine splitting, Hadron, proton Zemach radiu, Radius, 01 natural sciences, Oxygen, Nuclear physics, Charge radius, Transfer rate, 0103 physical sciences, LaBr3:Ce scintillator, Physics::Atomic Physics, 010306 general physics, Ground state, Hyperfine structure, muonic hydrogen, Exotic atom
Abstract

The FAMU experiment aims to measure for the first time the hyperfine splitting of the muonic hydrogen ground state. From this measurement the proton Zemach radius can be derived and this will shed light on the determination of the proton charge radius. In this paper, we describe the scientific goal, the method and the detailed preparatory work. This includes the outcome of preliminary measurements, subsequent refined simulations and the evaluation of the expected results. The experimental setup being built for the measurement of the hyperfine splitting to be performed at the RAL laboratory muon facility is also described.

Published
2020
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3. First FAMU observation of muon transfer from μp atoms to higher-Z elements

Author

L. Tortora, A. Vacchi, L. Colace, Maurizio Bonesini, A. Tomaselli, M. Rossella, Anselmo Margotti, E. Vallazza, Claudio Labanti, D. Guffanti, G. Zampa, R. Mazza, A. Curioni, T. Cervi, P. Danev, R. Carbone, Germano Baldazzi, Ezio Previtali, Paolo Rossi, Roberto Benocci, R. Bertoni, M. Furini, K. S. Gadedjisso-Tossou, L. Stoychev, Miltcho B. Danailov, Dimitar Bakalov, Giovanni Baccolo, M. Stoilov, K. Ishida, F. Fuschino, E. Furlanetto, L. P. Rignanese, M. Moretti, Gianluca Morgante, R. Nardò, Massimiliano Nastasi, G. Campana, C. De Vecchi, F. Chignoli, M. De Vincenzi, I. D'Antone, Andrzej Adamczak, C. Pizzolotto, E. Mocchiutti, A. Iaciofano, S. Meneghini, F. Somma, Valter Maggi, M. Zuffa, Alessandro Menegolli, A. Rachevski, A. de Bari, M. Clemenza, V. Bonvicini, Joseph Niemela, Roberta Ramponi, Mocchiutti, E., Bonvicini, V., Carbone, R., Danailov, M., Furlanetto, E., Gadedjisso-Tossou, K.S., Guffanti, D., Pizzolotto, C., Rachevski, A., Stoychev, L., Vallazza, E., Zampa, G., Niemela, J., Ishida, K., Adamczak, A., Baccolo, G., Benocci, R., Bertoni, R., Bonesini, M., Chignoli, F., Clemenza, M., Curioni, A., Maggi, V., Mazza, R., Moretti, M., Nastasi, M., Previtali, E., Bakalov, D., Danev, P., Stoilov, M., Baldazzi, G., Campana, G., D'Antone, I., Furini, M., Fuschino, F., Labanti, C., Margotti, A., Meneghini, S., Morgante, G., Rignanese, L.P., Rossi, P.L., Zuffa, M., Cervi, T., Bari, A.D., Menegolli, A., Vecchi, C.D., Nardò, R., Rossella, M., Tomaselli, A., Colace, L., Vincenzi, M.D., Iaciofano, A., Somma, F., Tortora, L., Ramponi, R., Vacchi, A., Gadedjisso-Tossou, K. S., Baldazzi, Germano, Rignanese, L. P., Rossi, P. L., Bari, A. De, Vecchi, C. De, Vincenzi, M. De, Iaciofano, Alfredo, Mocchiutti, E, Bonvicini, V, Carbone, R, Danailov, M, Furlanetto, E, Gadedjisso-Tossou, K, Guffanti, D, Pizzolotto, C, Rachevski, A, Stoychev, L, Vallazza, E, Zampa, G, Niemela, J, Ishidaf, K, Adamczak, A, Baccolo, G, Benocci, R, Bertoni, R, Bonesini, M, Chignoli, F, Clemenza, M, Curioni, A, Maggi, V, Mazza, R, Moretti, M, Nastasi, M, Previtali, E, Bakalov, D, Danev, P, Stoilov, M, Baldazzi, G, Campana, G, D'Antone, I, Furini, M, Fuschino, F, Labanti, C, Margotti, A, Meneghini, S, Morgante, G, Rignanese, L, Rossi, P, Zuffa, M, Cervi, T, De Bari, A, Menegolli, A, De Vecchi, C, Nardò, R, Rossella, M, Tomaselli, A, Colace, L, De Vincenzi, M, Iaciofano, A, Somma, F, Tortora, L, and Vacchi, R

Subjects
X-ray detector, Pressurized ga, Ground state, chemistry.chemical_element, Charged particle, Measurements of, Atom, 01 natural sciences, Timing detectors, Nuclear physics, 0103 physical sciences, 010306 general physics, Instrumentation, Hyperfine structure, Mathematical Physics, Exotic atom, X rays, Hyperfine splitting, Physics, Kinetic, Argon, Muon, Rutherford appleton laboratorie, 010308 nuclear & particles physics, Muonic hydrogen, X-ray detectors, Transfer rates, X ray detector, Carbon, chemistry, Carbon dioxide, Timing detector, Excited state, Analysis and statistical methods, Physics::Accelerator Physics, X ray apparatu, Analysis and statistical method, Kinetic energy, Beam (structure), Muon transfer rate
Abstract

The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, U.K.). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited μp atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the μp currently under way. © 2018 The Author(s).

Published
2018

4. Optical and Structural Characterization of Pin Photodetector Based on Germanium Nanocrystals for Third Generation Solar Cells

Author

Bruno Grandidier, K. S. Gadedjisso-Tossou, K. K. Sossoe, Agbeko Messanh Mohou, and M. M. Dzagli

Subjects
Solar cells, Renewable energy, Radiation, Materials science, business.industry, Photodetector, chemistry.chemical_element, Germanium, Quantum dot solar cell, Condensed Matter Physics, Third generation, Characterization (materials science), Nanocrystal, chemistry, Scanning tunneling spectroscopy, Germanium nanocrystals, Optoelectronics, General Materials Science, business
Abstract

We investigated the structural and optoelectronic properties of p-n germanium nanocrystals based junctions embedded between GaAs substrate and layers of ZnO:Al or a-Si:H. Scanning electron microscopy and scanning tunneling microscopy were used on these junctions in this work. Calculations of tunneling current on the substrate showed effect of localized defects trapping Fermi level at the surface tending to make a semi-insulating substrate. The average value of the diameter of the Ge nanoparticle is around 12.5 nm. These results lay the foundation for the development of solar cells which active part is made of GeNCs.

Published
2016

5. Etude du champ lointain de la double hétérostructure laser GaInAsSb/GaAlAsSb

Author

M. A. Mohou, K. S. Gadedjisso-Tossou, and M. M. Dzagli

Subjects
Double hétérostructure, Equations de Maxwell, Diode laser, champ lointain, Earth-Surface Processes
Abstract

La theorie electromagnetique de la double heterostructure (DH) laser Ga1-xAlxAsySb1-y/Ga1-x’Inx’Asy’Sb1-y’/Ga1-xAlxAsySb1-y a ete realisee a partir des equations de Maxwell, Huyghens et Fraunhofer. Elle a permis d’etablir l’expression du champ lointain dans le plan orthogonal a l’heterojonction. L’optimisation de la structure laser a permis d’etablir les conditions pour un meilleur couplage de la DH laser avec la fibre optique. En particulier, nous montrons que le champ perpendiculaire depend de la difference d’indices Δn= (n2 – n1). Mots-cles : Double heterostructure, Equations de Maxwell, Diode laser, champ lointain.

Published
2010

6. Pulse amplification in a Cr4+:forsterite single longitudinal mode (SLM) multi-pass amplifier.

Author

L I Stoychev, H Cabrera, K S Gadedjisso-Tossou, I P Nikolov, P Sigalotti, A A Demidovich, J J Suárez-Vargas, E Mocchiutti, J Niemela, M Baruzzo, N Vasiliev, Y Zaporozhchenko, M B Danailov, and Andrea Vacchi

Abstract

An efficient multi-pass Cr:forsterite master oscillator-power amplifier laser system operating in the single-longitudinal mode was demonstrated and characterized. A significant increase in energy was obtained in a six-pass amplifier configuration giving a maximum value of up to 10.8 mJ, with a good beam quality and without significantly broadening the linewidth or increasing the M2. The amplifier performance was evaluated as a function of the pump energy and the number of passes. A Fourier transformation of the laser pulses was performed to confirm the linewidth value measured using a Fabry–Perot etalon. [ABSTRACT FROM AUTHOR]

Published
2019
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