المؤلفون: Sarkar, Arnab¹ (AUTHOR) arnabsar@mit.edu, Grant, Catherine E.¹ (AUTHOR), Miller, Eric D.¹ (AUTHOR), Bautz, Mark¹ (AUTHOR), Schneider, Benjamin¹ (AUTHOR), Foster, Rick F.¹ (AUTHOR), Schellenberger, Gerrit² (AUTHOR), Allen, Steven³ (AUTHOR), Kraft, Ralph P.² (AUTHOR), Wilkins, Dan³ (AUTHOR), Falcone, Abe⁴ (AUTHOR), Ptak, Andrew⁵ (AUTHOR)

المصدر: Astrophysical Journal. 7/20/2024, Vol. 970 Issue 1, p1-12. 12p.

مصطلحات موضوعية: *MAGNETIC spectrometer, *GALACTIC cosmic rays, *X-rays, *X-ray spectrometers

مستخلص: Galactic cosmic-ray (GCR) particles have a significant impact on the particle-induced background of X-ray observatories, and their flux exhibits substantial temporal variability, potentially influencing background levels. In this study, we present 1 day binned high-energy reject rates derived from the Chandra-ACIS and XMM-Newton EPIC-pn instruments, serving as proxies for the GCR particle flux. We systematically analyze the ACIS and EPIC-pn reject rates and compare them with the AMS proton flux. Our analysis initially reveals robust correlations between the AMS proton flux and the ACIS/EPIC-pn reject rates when binned over 27 day intervals. However, a closer examination reveals substantial fluctuations within each 27 day bin, indicating shorter-term variability. Upon daily binning, we observe finer temporal structures in the data sets, demonstrating the presence of recurrent variations with periods of ∼25 days and 23 days in the ACIS and EPIC-pn reject rates, respectively, spanning the years 2014–2018. Notably, during the 2016–2017 period, we additionally detect periodicities of ∼13.5 days and 9 days in the ACIS and EPIC-pn reject rates, respectively. Intriguingly, we observe a time lag of ∼6 days between the AMS proton flux and the ACIS/EPIC-pn reject rates during the second half of 2016. This time lag is not visible before 2016 and after 2017. The underlying physical mechanisms responsible for this time lag remain a subject of ongoing investigation. [ABSTRACT FROM AUTHOR]

المؤلفون: Cortesi, Marco¹ cortesi@frib.msu.edu, Pereira, Jorge¹, Dziubinski, Sean^1,2, Lidia, Steven¹, Zegers, Remco^1,2, Bazin, Daniel^1,2, Cerizza, Giordano¹, Asciutto, Joseph¹, Gade, Alexandra^1,2

المصدر: EPJ Web of Conferences. 12/8/2023, Vol. 290, p1-5. 5p.

مصطلحات موضوعية: *DATA acquisition systems, *MAGNETIC spectrometer, *DETECTORS, *ENERGY dissipation, *SOUND spectrography

مستخلص: The present work describes the ongoing upgrade of the focal-plane detector system and the associated data acquisition system of the large-acceptance S800 magnetic spectrograph. It includes the development of an innovative micro-pattern gaseous detector readout for the tracking system, a novel energy-loss detector concept for Z-identification, and a high resolution optical readout for the timing scintillator detector. The upgraded focal-plane detector system will allow for improved particle identification for heavy-ion beams above Z=100, at higher rate capability (> 25 kHz). [ABSTRACT FROM AUTHOR]

المؤلفون: Spatafora, Alessandro, Carbone, Diana, Cappuzzello, Francesco, Cavallaro, Manuela, Acosta, Luis E., Agodi, Clementina, Amador-Valenzuela, Paulina, Borello-Lewin, Thereza, Brischetto, Giuseppe A., Calvo, Daniela, Chávez-Lomelí, Efrain R., Ciraldo, Irene, De Gregorio, Giovanni, Delaunay, Franck, Djapo, Haris, Eke, Canel, Finocchiaro, Paolo, Firat, Suna, Fisichella, Maria, Gargano, Angela

المصدر: EPJ Web of Conferences; 3/14/2024, Vol. 292, p1-6, 6p

مصطلحات موضوعية: MULTICHANNEL communication, NUCLEAR reactions, CYCLOTRONS, MAGNETIC spectrometer, SPECTROMETRY

مستخلص: The study of a network of nuclear reactions populated in the ¹⁸O + ¹²C collision is the main topic of the present paper. It was performed to test nuclear structure and reaction theories in describing the full reaction mechanism occurring in the (¹⁸O, ¹⁸F) single charge exchange nuclear reaction. From the experimental side, an ¹⁸O beam was produced at 275 MeV incident energy by the K800 superconducting cyclotron and the MAGNEX magnetic spectrometer was used at the Laboratori Nazionali del Sud of the Istituto Nazionale di Fisica Nucleare to momentum analyse the ejectiles produced in the nuclear reactions within the same experimental setup. From the theoretical side, the proposed approach consists of analysing the whole network of nuclear reactions in the framework of a unique comprehensive and coherent theoretical calculation. This holistic approach, applied both to the experimental and theoretical analysis, is the main feature and novelty of the work presented here. [ABSTRACT FROM AUTHOR]

: Copyright of EPJ Web of Conferences is the property of EDP Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Pérez-Vidal, R. M.^1,2 (AUTHOR), Galtarossa, F.³ (AUTHOR), Mijatović, T.⁴ (AUTHOR), Szilner, S.⁴ (AUTHOR), Zanon, I.² (AUTHOR), Brugnara, D.² (AUTHOR), Pellumaj, J.^2,5 (AUTHOR), Ciemala, M.⁶ (AUTHOR), Valiente-Dobón, J. J.² (AUTHOR), Corradi, L.² (AUTHOR), Clément, E.⁷ (AUTHOR), Leoni, S.^8,9 (AUTHOR), Fornal, B.⁶ (AUTHOR), Siciliano, M.¹⁰ (AUTHOR), Gadea, A.¹ (AUTHOR) gadea@ific.uv.es

المصدر: European Physical Journal A -- Hadrons & Nuclei. May2023, Vol. 59 Issue 5, p1-15. 15p.

مصطلحات موضوعية: *NUCLEAR structure, *MAGNETIC spectrometer, *EXCITED states, *PROTON transfer reactions

مصطلحات جغرافية: EUROPE

مستخلص: Multi-Nucleon Transfer (MNT) reactions have been used for decades as a reaction mechanism, in order to populate excited states in nuclei far from stability and to perform nuclear structure studies. Nevertheless, the development of set-ups involving high acceptance tracking magnetic spectrometers (mainly existing in Europe), coupled with the Advanced GAmma Tracking Array (AGATA) opens new possibilities, especially if they are used in conjunction with high-intensity stable beams or ISOL RIBs. In this article, we will discuss the capabilities of such set-ups aiming at different goals, including complete information in high-resolution spectroscopy as well as lifetime measurements. [ABSTRACT FROM AUTHOR]

المؤلفون: Gogami, Toshiyuki¹ gogami.toshiyuki.4a@kyoto-u.ac.jp, Achenbach, Patrick², Ahn, Jung Keun³, Androić, Darko⁴, Aoki, Kanae⁵, Asaturyan, Arshak⁶, Botta, Elena⁷, Bukhari, Masroor. H.⁸, Camsonne, Alexandre⁹, Covrig, Silviu. C.⁹, Ebata, Kengo^1,10, Ekawa, Hiroyuki¹¹, Evtoukhovitch, Petr¹², Feliciello, Alessandro⁷, Fujioka, Hiroyuki¹³, Fujita, Manami¹⁰, Garibaldi, Franco¹⁴, Harada, Takeshi. K.^1,10, Hasegawa, Shoichi¹⁰, Hasegawa, Tomoyuki¹⁵

المصدر: EPJ Web of Conferences. 11/18/2022, Vol. 271, p1-7. 7p.

مصطلحات موضوعية: *NUCLEAR physics experiments, *MAGNETIC spectrometer, *HADRONS, *COMPOSITE particles (Nuclear particles), *PHYSICS experiments

مستخلص: In the K1.8 beam-line at Hadron Experimental Facility of J-PARC, a new magnetic spectrometer S-2S is being installed. S-2S was designed to achieve a high momentum resolution of Δp/p = 6 × 10−4 in FWHM. Several strangeness-physics programs which require the high resolution will be realized by S-2S. The present article introduces J-PARC E70 (missing-mass spectroscopy of Ξ12Be) and E94 (missing-mass spectroscopy of Λ7Li, Λ10B, and Λ12C) experiments. [ABSTRACT FROM AUTHOR]

المؤلفون: TIAN Baoxian1, WANG Haoran1,2, BO Nan1,2, LIU Fulong1, SUN Wei1, LIN Lin3, WANG Naiyan

المصدر: Yuanzineng kexue jishu, Vol 58, Iss 4, Pp 903-912 (2024)

مصطلحات موضوعية: electron magnetic spectrometer, electron energy spectrum, energy dispersion, energy resolution, Nuclear engineering. Atomic power, TK9001-9401, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798

الوصف: The interactions of ultra-intense lasers with targets can generate relativistic electrons and various secondary particles such as energetic protons, ions, neutrons, X and γ rays. The particles and rays have been used in many fields of science research and applications including inertial confinement fusion (ICF), laser nuclear physics, laboratory astrophysics, charge particle acceleration, particle imaging, nuclear medicine, biology, and material science. As the primary particles, the characterization of hot electrons is very essential for understanding laser-plasma physics, optimizing particle parameters, and meeting various application requirements. In previous studies, electron magnetic spectrometer (EMS) is commonly favored because of its simple structure and low cost. The electrons of different energy are directly deflected along different trajectories by the Lorenz force to disperse electron energies. In most designs of EMSs, the magnetic field and energy dispersion were only described. The detailed characteristic parameters and their influencing factors, such as energy resolution, angle divergence broadening, and oblique incidence effects, lack in-depth analysis. Otherwise, most EMSs were used in laser-plasma experiments without calibration. The reliability and uncertainties of electron spectrum data should be further investigated. In the work, a compact and wide-range electron magnetic spectrometer with magnetic strength of 500 Gs were described. The detailed characteristics of the EMS were analyzed, including electron energy dispersion, energy dispersion gradient, energy resolution, and oblique incident effect. The results indicate that the energy resolution is influenced by electron energy, incident aperture, and divergence angle. Compared to the front and rear panel, the electrons deflected to the side panel have significant advantages in energy dispersion gradient and energy resolution. The energy range of the side panel should be considered as the main work region. The EMS were calibrated by 0.7-2 MeV electrons on the DC-SRF-Ⅱ beam line device. The spectrum peak energy is approximately equal to the corrected energy passing through the 200 μm beryllium window. The electron energy resolution is slightly larger than the EMS energy resolution itself, and it is significantly increased in air compared to that in vacuum. In order to improve the energy resolution, the incident aperture and divergence angle should be further reduced, which are also beneficial for reducing background signals. The EMS will be used to measure hot electrons produced by laser-solid interactions in the following work. The accurate measurement of the electron energy spectrum is of great significance for studying and optimizing the hot electron, proton, and X/γ sources and their applications.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1000-6931Test

الوصول الحر: https://doaj.org/article/7287dc4afdd545839370379cc264553aTest

المؤلفون: Tacza, J., Li, G., Raulin, J.-P.

المصدر: Space Weather: The International Journal of Research & Applications; Apr2024, Vol. 22 Issue 4, p1-14, 14p

مصطلحات موضوعية: ELECTRIC circuits, MAGNETIC spectrometer, MAGNETIC measurements, SPACE stations, SEA level, COSMIC rays

مصطلحات جغرافية: ARGENTINA

مستخلص: The suppression of high-energy cosmic rays, known as Forbush decreases (FDs), represents a promising factor in influencing the global electric circuit (GEC) system. Researchers have delved into these effects by examining variations, often disruptive, of the potential gradient (PG) in ground-based measurements taken in fair weather regions. In this paper, we aim to investigate deviations observed in the diurnal curve of the PG, as compared to the mean values derived from fair weather conditions, during both mild and strong Forbush decreases. Unlike the traditional classification of FDs, which are based on ground level neutron monitor data, we classify FDs using measurements of the Alpha Magnetic Spectrometer (AMS-02) on the International Space Station. To conduct our analysis, we employ the superposed epoch method, focusing on PGs collected between January 2010 and December 2019 at a specific station situated at a low latitude and high altitude: the Complejo Astronómico El Leoncito (CASLEO) in Argentina (31.78°S, 2,550 m above sea level). Our findings reveal that for events associated with FDs having flux amplitude (A) decrease ≤10%, no significant change in the PG is observed. However, for FDs with A > 10%, a clear increase in the PG is seen. For these A > 10% events, we also find a good correlation between the variation of Dst and Kp indices and the variation of PG. [ABSTRACT FROM AUTHOR]

: Copyright of Space Weather: The International Journal of Research & Applications is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Michaud, J.¹ (AUTHOR) julien.michaud@ijclab.in2p3.fr, Balana, A.¹ (AUTHOR), Blank, B.¹ (AUTHOR), Daudin, L.¹ (AUTHOR), Husson, A.¹ (AUTHOR), Lachacinski, B.¹ (AUTHOR), Lacombe, K.¹ (AUTHOR), Serani, L.¹ (AUTHOR)

المصدر: Nuclear Instruments & Methods in Physics Research Section B. Aug2023, Vol. 541, p243-245. 3p.

مصطلحات موضوعية: *MAGNETIC spectrometer, *PULSE generators, *MAGNETIC separators, *ION sources, *ION beams, *MAGNETIC testing

مستخلص: Characterizing a (high resolution) magnetic separator may not be easy as it is difficult to find a stable ion source providing species with close enough masses to separate. As these instruments perform a momentum separation (B ρ = p / q), their mass and energy resolution are strictly the same. One can use this property to characterize the mass resolution of a spectrometer through its energy resolution. Hence, multiple identical beams with close energies can be used to test a magnetic spectrometer in almost real conditions. The method we present allows to populate an ion beam with multiple close and well-defined energies. It consists in using an arbitrary pulse generator to temporally change the acceleration potential of the ion source, and create a custom energy distribution, where the length in time of the pulse is the production ratio of the contaminant and the amplitude its relative energy (i.e. its mass). [Display omitted] [ABSTRACT FROM AUTHOR]

المؤلفون: Yan, Qi¹ (AUTHOR) qyan@cern.ch, Choutko, Vitaly¹ (AUTHOR)

المصدر: European Physical Journal C -- Particles & Fields. Mar2023, Vol. 83 Issue 3, p1-29. 29p.

مصطلحات موضوعية: *MAGNETIC spectrometer, *PARTICLE detectors, *PARTICLE physics, *PERMANENT magnets, *SPACE stations

الشركة/الكيان: EUROPEAN Organization for Nuclear Research

مستخلص: The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector operating at an altitude of ∼ 410 km aboard the International Space Station. The AMS silicon tracker, together with the permanent magnet, measures the rigidity (momentum/charge) of cosmic rays in the range from ∼ 0.5 GV to several TV. In order to have accurate rigidity measurements, the positions of more than 2000 tracker modules have to be determined at the micron level by an alignment procedure. The tracker was first aligned using the 400 GeV/c proton test beam at CERN and then re-aligned using cosmic-ray events after being launched into space. A unique method to align the permanent magnetic spectrometer for a space experiment is presented. The developed underlying mathematical algorithm is discussed in detail. [ABSTRACT FROM AUTHOR]

المؤلفون: Yang, Fei¹ (AUTHOR), Sun, Qie¹ (AUTHOR), Cheng, Lin² (AUTHOR)

المصدر: Numerical Heat Transfer: Part A -- Applications. 2023, Vol. 83 Issue 4, p417-439. 23p.

مصطلحات موضوعية: *MAGNETIC spectrometer, *ORBITS (Astronomy), *PARTICLE physics, *SOLAR cells, *PARTICLE detectors

مستخلص: Alpha Magnetic Spectrometer (AMS) is a unique particle physics detector installed on the International Space Station (ISS). In this article, the numerical simulation model of AMS in orbit was established in Thermal Desktop. With the model, temperature variations of AMS surfaces under the ISS normal and special operating conditions were analyzed, the effects of ISS orbital parameters and ISS special operations on the temperatures of AMS were revealed, and the extreme thermal situations of AMS RAM and WAKE main radiators were obtained. As for the high temperature warnings occurred at Power distribution system (PDS) under the hottest situation, locking ISS starboard solar arrays vertically is effectively and suggested as the thermal control strategy. [ABSTRACT FROM AUTHOR]