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Design and construction of charged-particle telescope array for study of exotic nuclear clustering structure

Nuclear Science and Techniques 2024年第8期35卷 114-123页

作者： Zheng‑Li Liao Xi‑Guang Cao Yu‑Xuan Yang Chang‑Bo Fu Xian‑Gai Deng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Zhengzhou University Zhengzhou 450001China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438China

The exploration of exotic shapes and properties of atomic nuclei,e.g.,αcluster and toroidal shape,is a fascinating field in nuclear *** study the decay of these nuclei,a novel detector aimed at detecting multipleα-particle events was designed and *** detector comprises two layers of double-sided silicon strip detectors(DSSD)and a cesium iodide scintillator array coupled with silicon photomultipliers array as light sensors,which has the advantages of their small size,fast response,and large dynamic *** coupled with cesium iodide crystal arrays are used to distinguish multipleα*** detector array has a compact and integrated design that can be adapted to different experimental *** detector array was simulated using Geant4,and the excitation energy spectra of someα-clustering nuclei were reconstructed to demonstrate the *** simulation results show that the detector array has excellent angular and energy resolutions,enabling effective reconstruction of the nuclear excited state by multipleαparticle *** detector offers a new and powerful tool for nuclear physics experiments and has the potential to discover interesting physical phenomena related to exotic nuclear structures and their decay mechanisms.

关键词： Cluster decay Toroidal structure telescope array SiPM Energy resolution

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An Observation Scheduling System for Radio telescope array

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APPLIED SCIENCES-BASEL 2025年第6期15卷 3088-3088页

作者： Ma, Chi Zhao, Rushuang Lao, Baoqiang Xiao, Wenjun Liu, Hui You, Ziyi Guizhou Normal Univ Sch Phys & Elect Sci Guiyang 550025 Peoples R China Yunnan Univ Sch Phys & Astron Kunming 650000 Peoples R China

The 4 x 4.5 m radio telescope array at Guizhou Normal University is an astronomical observation facility in operation, mainly aiming at the scientific detection of pulsars and fast radio bursts. To adequately address the observational requirements of this telescope array, we developed an observation scheduling system. This system is able to predict and plot the elevation change curves of the observed targets in relation to the telescope array during the whole day. In addition, for multiple targets, it provides intelligent scheduling and processing according to the observable time. The system also offers a comprehensive database of calibrators for the flux calibration of the targets. Moreover, it can generate pre-configured array uv coverage maps, which assist in determining the optimal configuration of the array. This system has been operating during the daily observations of the 4x4.5 m radio telescope array and has successfully detected two typical pulsars. It has also been tested for applicability in target-observation prediction in other radio telescope arrays.

关键词： telescope array trajectory prediction intelligent scheduling flux calibration uv coverage software development

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HighSpec: A High-Resolution Spectrograph for the MAST telescope array 10

HighSpec: A High-Resolution Spectrograph for the MAST Telesc...

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Conference on Ground-Based and Airborne Instrumentation for Astronomy X

作者： Rimalt, Yahel Sofer Ben-Ami, Sagi Ofek, Eran Hallakoun, Na'ama Irani, Ido Ironi, Oren Achren, Jani Bichkovsky, Alex Blumenzweig, Arie Hershko, Ofir Kuncarayakti, Hanindyo Mattila, Seppo Mazeh, Tsevi Mikhnevich, Gleb Polishook, David Yaron, Ofer Weizmann Inst Sci 234 Herzl St IL-7610001 Rehovot Israel Incident Angle Oy Capsiankatu 4 A 29 FI-20320 Turku Finland Univ Turku Dept Phys & Astron Tuorla Observ Vaisalantie 20 Piikkio 21500 Finland Univ Turku Finnish Ctr Astron ESO FINCA FI-20014 Turku Finland Tel Aviv Univ 55 Chaim Levanon St IL-6997801 Tel Aviv Israel

ISBN: (纸本)9781510675155;9781510675162

We present the updated design of HighSpec, a high-resolution R similar to 20, 000 spectrograph designed for the Multi Aperture Spectroscopic telescope (MAST). HighSpec offers three observing modes centered at the Ca II H&K, Mgb triplet, and Ha lines. Each mode is supported by a highly optimized ion-etched grating, contributing to an instrument exceptional peak efficiency of greater than or similar to 85% for the two latter bands (greater than or similar to 55% for the Ca II H&K band). Optimizing throughput over wavelength coverage (Delta lambda = 10-17 nm), HighSpec enables the precise measurement of spectral lines from faint targets. This approach is especially relevant for stellar object studies, specifically of WDs, which are intrinsically faint and have few spectroscopic lines. Each observing mode was tailored to target spectral features essential for WD research. Its integration with MAST, an array of 20 custom-designed telescopes that can function as a single large telescope (equivalent to a 2.7m telescope in collecting area) or multiplexing over the entire sky, provides unique adaptability for extensive and effective spectroscopic campaigns. Currently in its final assembly and testing stages, HighSpec's on-sky commissioning is scheduled for 2025.

关键词： Optical spectrographs telescope array high-resolution ion-etched grating white dwarfs

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The Grand Spherical telescope array (GSTA) 10

The Grand Spherical Telescope Array (GSTA)

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Conference on Ground-Based and Airborne telescopes X

作者： Nishikawa, Jun Natl Astron Observ Japan 2-21-1 Osawa Mitaka Tokyo 1818588 Japan Grad Univ Adv Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo 1818588 Japan NINS Astrobiolgy Ctr 2-21-1 Osawa Mitaka Tokyo 1818588 Japan

ISBN: (纸本)9781510675117;9781510675124

This paper describes a telescope concept that has an aperture area equivalent to 88 m in diameter by arranging 16 telescopes with an aperture of 22 m closely within a 250 m range. The primary mirror uses an off-axis spherical mirror fixed on the ground to eliminate diurnal movement and reduce costs, and a subsequent correction unit consisting of three or more aspherical mirrors corrects most of the aberrations of the primary mirror. The correction unit is placed on a cliff of about 40m high, and diurnal motion can be tracked for 20 minutes around the meridian passes. Multiple correction units separated in the north-south direction can be operated simultaneously at each telescope. The wide-field camera is integrated with the correction unit, but the other instruments are fixed on the cliff and the light is relayed there. All telescopes are equipped with wide-field cameras and enable high-speed deep surveys. High signal-to-noise ratio spectroscopic observations can be made by installing the same spectrograph on all telescopes. In addition, all telescopes have laser-guide star adaptive optics, optical delaylines, and coude paths, which allow light from all telescopes to be focused in one location in phase to function as one ultimate telescope. This will enable the exploration of exoplanets and the study of galactic objects with high angular resolution and high sensitivity.

关键词： extremely large telescope spherical telescope survey telescope telescope array

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Nulling interferometry in space does not require a rotating telescope array

Nulling interferometry in space does not require a rotating ...

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Conference on Space telescopes and Instrumentation - Optical, Infrared, and Millimeter Wave

作者： Henault, Francois Univ Grenoble Alpes Ctr Natl Rech Sci Inst Planetol & Astrophys Grenoble BP 53 F-38041 Grenoble France

ISBN: (纸本)9781510653429

Space borne nulling interferometry in the mid-infrared waveband is one of the most promising techniques for characterizing the atmospheres of extra-solar planets orbiting in the habitable zone of their parent star, and possibly discovering life markers. One of its most difficult challenges is the control of free-flying telescope spacecrafts moving around a central combiner in order to modulating the planet signal, within accuracy better than one micrometer at least. Moreover, the whole array must be reconfigured regularly in order to observe different celestial targets, thus increasing the risk of loosing one or more spacecrafts and aborting the mission before its normal end. In this paper is described a simplified optical configuration where the telescopes do not need to be rotated, and the number of necessary array reconfigurations is minimized. It allows efficient modulation of the planet signal, only making use of rotating prisms or mirrors located into the central combiner. In this paper the general principle of a nulling interferometer with a fixed telescope array is explained. Mathematical relations are established in order to determining the planet modulation signal. Numerical simulations are carried out for three different arrangements of the collecting telescopes. They confirm that nulling interferometry in space does not require a rotating telescope array.

关键词： Nulling interferometry Space interferometer telescope array Extrasolar planets

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Generation of the Ground Detector Readings of the telescope array Experiment and the Search for Anomalies Using Neural Networks

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MOSCOW UNIVERSITY PHYSICS BULLETIN 2023年第SUPPL 1期78卷 S59-S63页

作者： Fitagdinov, R. R. Kharuk, I. V. Russian Acad Sci Inst Nucl Res Moscow 117312 Russia Moscow Inst Phys & Technol Dolgoprudnyi 141700 Moscow Oblast Russia

We report on the development of neural networks for generating readings from telescope array's surface detectors with the largest registered integral signal. To achieve this goal, we implemented generative Wasserstein adversarial networks with the gradient penalty. The data used to train the model was generated using the Monte Carlo method. We obtained visually similar data which are consistent with the physics of the underlying processes. The anomaly search method can be employed to identify discrepancies between real and simulated data, as well as to introduce a quantitative measure of similarity between the real detector readings and those generated by the neural network's readings.

关键词： telescope array GAN fast Monte Carlo data sampling astrophysics

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Recent Results and Future Prospects From the telescope array Experiment

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Nuclear and Particle Physics Proceedings 2017年 291-293卷 74-81页

作者： Ikeda, Daisuke Institute for Cosmic Ray Research University of Tokyo Kashiwa 277-8582 Chiba Japan

The telescope array (TA) experiment is the largest Ultra-High Energy Cosmic Ray (UHECR) observatory in the northern hemisphere, located in the west Utah desert. The recent results of the measurements for the energy spectrum, composition and anisotropy of UHECRs from the TA seven years observation are presented. In addition, the design and current status of the TA extensions, TA×4 and TALE, is discussed. © 2017 Elsevier B.V.

关键词： anisotropy cosmic ray energy spectrum hotspot mass composition telescope array UHECR

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Results from the telescope array Experiment

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Nuclear and Particle Physics Proceedings 2016年 273-275卷 440-445页

作者： Jui, Charles C.H. Department of Physics and Astronomy University of Utah 115 S 1400 E JFB 201 Salt Lake City 84112 UT United States

The telescope array (TA) is the largest ultrahigh energy cosmic ray detector in the northern hemisphere. The experiment consists of three fluorescence stations viewing the air space over a surface array of 507 scintillation counters deployed over 700 square kilometers. TA has been in operation since 2008. The most recent results from TA, including that of composition studies and search for arrival direction anisotropy, will be presented. We will also report on the progress of the new TA low energy extension (TALE). © 2016.

关键词： Anisotropy Composition Cosmic rays Energy spectrum Particle astrophysics telescope array

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Supernova and optical transient observations using the three wide-field telescope array of the KMTNet 6

Supernova and optical transient observations using the three...

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Conference on Ground-Based and Airborne telescopes VI

作者： Moon, Dae-Sik Kim, Sang Chul Lee, Jae-Joon Pak, Mina Park, Hong Soo He, Matthias Yang Antoniadis, John Ni, Yuan Qi Lee, Chung-Uk Kim, Seung-Lee Park, Byeong-Gon Kim, Dong-Jin Cha, Sang-Mok Lee, Yongseok Gonzalez, Santiago Univ Toronto Dept Astron & Astrophys 50 St Geroge St Toronto ON M5S 4H4 Canada Korea Astron & Space Sci Inst 776 Daedeokdae Ro Daejeon South Korea Korea Univ Sci & Technol 217 Gajeong Ro Daejeon South Korea Univ Toronto Dunlap Inst Astron & Astrophys 50 St George St Toronto ON M5S 4H4 Canada Kyung Hee Univ Sch Space Res Yongin 17104 South Korea Univ Chile Millennium Inst Astrophys Beauchef 851 Santiago Chile Univ Chile Ctr Math Modelling Beauchef 851 Santiago Chile

ISBN: (数字)9781510601925

ISBN: (纸本)9781510601918;9781510601925

The Korea Microlensing telescope Network (KMTNet) is a network of three new 1.6-m, wide-field telescopes spread over three different sites in Chile, South Africa and Australia. Each telescope is equipped with a four square degree wide-field CCD camera, making the KMTNet an ideal facility for discovering and monitoring early supernovae and other rapidly evolving optical transients by providing 24-hour continuous sky coverage. We describe our inaugurating program of observing supernovae and optical transients using about 20% of the KMTNet time in 2015-2019. Our early results include detection of infant supernovae, novae and peculiar transients as well as numerous variable stars and low surface brightness objects such as dwarf galaxies.

关键词： time domain transients supernovae novae variable stars dwarf galaxies stellar explosion telescope array

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Recent Results from the telescope array Project

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Nuclear and Particle Physics Proceedings 2016年 279-281卷 15-22页

作者： Hanlon, William F. High Energy Astrophysics Institute & Department of Physics and Astronomy University of Utah USA 201 James Fletcher Building 115 South 1400 East Salt Lake City 84112-0830 UT United States

The telescope array Project (TA) is the largest cosmic ray observatory in the northern hemisphere and has entered its eighth year of data collection exploring astrophysical phenomena at the highest ends of the cosmic ray energy spectrum. New additions to TA have expanded its reach down to lower parts of the energy spectrum, thus allowing it to probe over an unprecedented 4.5 decades of energy via hybrid detection techniques. Recent results suggestive of anisotropy in the arrival direction of cosmic rays are presented as well as updated measurements of the spectrum, primary source composition, new measurement of the inelastic proton-air cross section, and the first ever quantitative radar cross section upper limit measurement. © 2016 Elsevier B.V.

关键词： Anisotropy Composition Cosmic Rays Proton-Air Cross Section Proton-Proton Cross Section Radar Cross Section Spectrum telescope array UHECR

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