Journal of the Optical Society of America and Review of Scientific Instruments最新文献_第5页

Review of Scientific Instruments New Products. 科学仪器新产品综述。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0097851

A. Mandelis

引用次数: 0

In situ measurements of electrical resistivity of metals in a cubic multi-anvil apparatus by van der Pauw method. 用范德保法原位测量立方多砧装置中金属的电阻率。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0082207

Fan Yang, Xiaojun Hu, Y. Fei

引用次数: 2

Collective Thomson scattering diagnostic with in situ calibration system for velocity space analysis in large helical device. 大型螺旋装置速度空间分析现场标定系统的集体汤姆逊散射诊断。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0079296

M. Nishiura, Shun Adachi, Kenji Tanaka, S. Kubo, N. Kenmochi, T. Shimozuma, R. Yanai, T. Saito, H. Nuga, R. Seki

{"title":"Collective Thomson scattering diagnostic with in situ calibration system for velocity space analysis in large helical device.","authors":"M. Nishiura, Shun Adachi, Kenji Tanaka, S. Kubo, N. Kenmochi, T. Shimozuma, R. Yanai, T. Saito, H. Nuga, R. Seki","doi":"10.1063/5.0079296","DOIUrl":"https://doi.org/10.1063/5.0079296","url":null,"abstract":"A collective Thomson scattering (CTS) diagnostic with a ±3 GHz band around a 77 GHz gyrotron probe beam was developed to measure the velocity distribution of bulk and fast ions in high-temperature plasmas. We propose a new in situ calibration method for a CTS diagnostic system combined with a raytracing code. The method is applied in two situations for electron cyclotron emission in plasmas and in a CTS diagnostic with a modulated probe beam. Experimental results highlight the importance of refraction correction in probe and receive beams. The CTS spectrum is measured with the in situ calibrated CTS receiver and responds to fast ions originating from a tangential neutral beam with an energy of 170 keV and from a perpendicular beam with an energy of 60 keV, both in the large helical device. From a velocity space analysis model, the results elucidate the measured anisotropic CTS spectrum caused by fast ions. The calibration methods and analyses demonstrated here are essential for CTS, millimeter-wave diagnostics, and electron cyclotron heating required under fusion reactor conditions.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"27 1","pages":"053501"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73514795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

10-nanosecond dead time and low afterpulsing with a free-running reach-through single-photon avalanche diode. 10纳秒的死区时间和低后脉冲与自由运行的通达单光子雪崩二极管。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0086312

S. Farina, I. Labanca, G. Acconcia, M. Ghioni, I. Rech

引用次数: 1

Study of beamlets extracted from a multi-aperture and five-stage acceleration system. 多孔径五段加速系统中光束提取的研究。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0080804

M. Kashiwagi, M. Kisaki, G. Saquilayan, A. Kojima, J. Hiratsuka, M. Ichikawa, Y. Shimabukuro, M. Murayama, H. Tobari

{"title":"Study of beamlets extracted from a multi-aperture and five-stage acceleration system.","authors":"M. Kashiwagi, M. Kisaki, G. Saquilayan, A. Kojima, J. Hiratsuka, M. Ichikawa, Y. Shimabukuro, M. Murayama, H. Tobari","doi":"10.1063/5.0080804","DOIUrl":"https://doi.org/10.1063/5.0080804","url":null,"abstract":"A beam optics study using the ITER-relevant high intense negative ion beams, such as 1 MeV, 200 A/m2, has been performed experimentally and analytically using a multi-aperture and five-stage accelerator. Initially, multi-beamlets generated from this accelerator were deflected in various directions due to the magnetic field and space charge repulsion between beams and showed various divergences. These had limited the pulse length and the beam energy. Compensation methods of the beamlet deflections have worked effectively and contributed to achieving the ITER requirement, the divergence angle of <7 mrad, and the deflection angle of <1 mrad for 1 MeV beam. The beam pulse has been gradually extended from 1 to 100 s and is now going to a longer pulse based on these results. One of the remaining issues is to understand and suppress peripheral components of the beam, namely, the halo, and to reduce the local heat loads observed around the aperture edge. This halo component has been successfully distinguished from the beam core by using a newly developed beam emittance measurement system for high intense beams. By combining this measured beam emittance and the beam simulation, it was clarified for the first time that the halo components are generated in an area of 1 mm width from the aperture edge.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"26 1","pages":"053301"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76541087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Image shift correction, noise analysis, and model fitting of (cathodo-)luminescence hyperspectral maps. 阴极发光高光谱图的像移校正、噪声分析及模型拟合。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0080486

N. Tappy, A. Fontcuberta i Morral, C. Monachon

{"title":"Image shift correction, noise analysis, and model fitting of (cathodo-)luminescence hyperspectral maps.","authors":"N. Tappy, A. Fontcuberta i Morral, C. Monachon","doi":"10.1063/5.0080486","DOIUrl":"https://doi.org/10.1063/5.0080486","url":null,"abstract":"Hyperspectral imaging is an important asset of modern spectroscopy. It allows us to perform optical metrology at a high spatial resolution, for example in cathodoluminescence in scanning electron microscopy. However, hyperspectral datasets present added challenges in their analysis compared to individually taken spectra due to their lower signal to noise ratio and specific aberrations. On the other hand, the large volume of information in a hyperspectral dataset allows the application of advanced statistical analysis methods derived from machine-learning. In this article, we present a methodology to perform model fitting on hyperspectral maps, leveraging principal component analysis to perform a thorough noise analysis of the dataset. We explain how to correct the imaging shift artifact, specific to imaging spectroscopy, by directly evaluating it from the data. The impact of goodness-of-fit-indicators and parameter uncertainties is discussed. We provide indications on how to apply this technique to a variety of hyperspectral datasets acquired using other experimental techniques. As a practical example, we provide an implementation of this analysis using the open-source Python library hyperspy, which is implemented using the well established Jupyter Notebook framework in the scientific community.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"198 1","pages":"053702"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76646558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

High power high voltage bias-T for half wave resonators and radio frequency quadrupole couplers. 高功率高压偏置t半波谐振器和射频四极耦合器。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0086965

B. Kaizer, L. Weissman, A. Perry, T. Zchut, I. Fishman, J. Rodnizki, M. Eizenshtat, E. Farber

引用次数: 1

Optimization of transverse emittance for RF-driven negative hydrogen ion source developed at China Spallation Neutron Source. 中国散裂中子源研制的rf驱动负氢离子源横向发射度优化。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0086220

R. Zhu, Weidong Chen, Hui Li, H. Ouyang, Shengjin Liu, Yongchuan Xiao, Y. Lü, X. Cao, Fa-Bin Li, Jilei Sun, Shunming Liu, K. Xue

引用次数: 2

Modulation-free portable laser frequency and power stabilization system. 无调制便携式激光频率和功率稳定系统。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0083923

Mengke Wang, J. Kong, Jiqing Fu, Hao Liu, Xiaoyun Lu

{"title":"Modulation-free portable laser frequency and power stabilization system.","authors":"Mengke Wang, J. Kong, Jiqing Fu, Hao Liu, Xiaoyun Lu","doi":"10.1063/5.0083923","DOIUrl":"https://doi.org/10.1063/5.0083923","url":null,"abstract":"The performance of laser-based instruments heavily depends on the stability of their laser source. Some instruments, such as the Cs-4He magnetometer, even require the frequency stabilization and the power stabilization at the same time. In this work, we design a double-locking system with a fiber-coupled output on a small bread board and apply it to the pump laser of a Cs-4He magnetometer. By carefully choosing the stabilization methods, we significantly improve the long-term simultaneous stability of frequency and power of the pump laser. The laser frequency drifts in 2 h are reduced from 100 to 10 MHz. For 10 h continuous measurements, their Allan deviation obtains about two orders of magnitude improvement for the averaging time larger than 200 s and reaches σ(τ) = 1.57 × 10-9 with a 200 s averaging time. The laser power stability for 1.8 h also obtains two orders of magnitude improvement from 3.22% to 0.031%, and its power noise reaches a level that is very close to the electronic noise of the detector. Applying this stabilization system to the pump laser of a fiber-coupled Cs-4He magnetometer, its magnetic sensor noise is significantly reduced from 0.158 to 0.009 nT, which is a reasonable noise for magnetic field detection. With this on-board design of the laser stabilization system, it is more convenient to transform the magnetometer into an outdoor device.","PeriodicalId":54761,"journal":{"name":"Journal of the Optical Society of America and Review of Scientific Instruments","volume":"36 1","pages":"053001"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78299024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A three-dimensional small angle measurement system based on autocollimation method. 基于自准直法的三维小角度测量系统。

Journal of the Optical Society of America and Review of Scientific Instruments Pub Date : 2022-05-01 DOI: 10.1063/5.0089964

Wenran Ren, Jiwen Cui, Jiubin Tan

引用次数: 6