Review of Scientific Instruments最新文献_第10页

Development of a helix-based beam position monitor calibration system for sub-relativistic charged-particle beams.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0256290

Minwen Wang, Xin Zhuo, Mingtong Zhao, Maocheng Wang, Yihua Yan, Wenbo Ye, Mengtong Qiu, Zhongming Wang, Rui Zhu

{"title":"Development of a helix-based beam position monitor calibration system for sub-relativistic charged-particle beams.","authors":"Minwen Wang, Xin Zhuo, Mingtong Zhao, Maocheng Wang, Yihua Yan, Wenbo Ye, Mengtong Qiu, Zhongming Wang, Rui Zhu","doi":"10.1063/5.0256290","DOIUrl":"https://doi.org/10.1063/5.0256290","url":null,"abstract":"Accurate calibration of beam position monitor (BPM) responses is a prerequisite for precise beam position measurements. Traditional methods such as the stretched-wire or antenna method can accurately calibrate BPM responses for relativistic beams, but there has been a lack of effective calibration methods for non-relativistic beams, limiting the measurement accuracy of BPMs in low-energy proton or heavy ion linear accelerators. In this study, we developed a BPM calibration platform based on helical slow-wave structures, capable of effectively simulating the electromagnetic fields generated by non-relativistic beams and calibrating the BPM response to these beams. We introduced a period averaging method, which reduces calibration errors caused by impedance mismatches in the helix. We achieved offline calibration of button-type BPMs for non-relativistic beam response characteristics with β as low as 0.122 using this platform. BPM calibration data were compared with simulations and then on-line measurements in the medium beam transport line at the Xi'an Proton Application Facility. Within the central linear response region of the BPM (∼16% of the BPM aperture), the calibrated linear sensitivity of 0.0668 ± 0.0003 is in close agreement with the actual measurement result of 0.0669 ± 0.0009. In the nonlinear response region further from the center, extending to at least 60% of the BPM aperture, the relative measurement error of beam position can be controlled to within 1.2% after calibration. This advance significantly expands the measurement range and enhances the measurement accuracy of BPMs for non-relativistic beams.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143701373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First measurements with the Faraday cup fast ion loss detector on Wendelstein 7-X.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0223953

Samuel A Lazerson, David J Kulla, Alexandra LeViness, Brandon F Lee, Matthias Steffen, Beate Kursinski, Karsten Ewert

{"title":"First measurements with the Faraday cup fast ion loss detector on Wendelstein 7-X.","authors":"Samuel A Lazerson, David J Kulla, Alexandra LeViness, Brandon F Lee, Matthias Steffen, Beate Kursinski, Karsten Ewert","doi":"10.1063/5.0223953","DOIUrl":"https://doi.org/10.1063/5.0223953","url":null,"abstract":"The first measurements made with a prototype Faraday cup fast ion loss detector (FC-FILD) on the Wendelstein 7-X (W7-X) device are presented and shown to be consistent with lost neutral beam fast ions. The FC-FILD is a small form factor, energy resolving detector designed to be mounted inside the first wall armor tiles of W7-X. Such mounting will allow for a future detector array to be installed, which has been shown to be critical for demonstrating improved fast ion confinement with plasma beta (β = 2μ0p/B2). The prototype diagnostic is composed of a movable armature with a water cooled diagnostic head, mimicking the first wall armor tile cooling structure. The movement of the armature allows for assessment of different detector positions relative to the plasma edge. Measurements of lost fast ions in the low shear magnetic configuration are correlated with neutral beam blips and the neutral beam energy spectrum. Analysis of the rise time of the signals presents a timescale much faster than the energy or particle confinement time and of the order of the predicted neutral beam fast ion slowing down time. Simulations predict a larger signal amplitude than measured, and possible reasons for this are discussed. Finally, a redesigned aperture is presented, which allows for fast ions to reach the detector in a larger set of magnetic configurations.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143543140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intelligent tetrahydrothiophene gas detection based on electrochemical sensor array. 基于电化学传感器阵列的智能四氢噻吩气体检测。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0226213

Guoqing Xiao, Xi Lai, Liang Ge, Yong He, Yi Teng

{"title":"Intelligent tetrahydrothiophene gas detection based on electrochemical sensor array.","authors":"Guoqing Xiao, Xi Lai, Liang Ge, Yong He, Yi Teng","doi":"10.1063/5.0226213","DOIUrl":"https://doi.org/10.1063/5.0226213","url":null,"abstract":"With extensive use of natural gas energy, various gas accidents occur frequently. Reasonable odorization of natural gas is an effective way to detect gas leakage in time and avoid gas explosions. Therefore, it is necessary to realize the identification and concentration detection of natural gas odorants to ensure early warning without degrading the gas quality. Given the cross-interference effect of electrochemical gas sensors and the poor accuracy of conventional analysis methods, this paper proposed a method based on principal component analysis and the K-nearest neighbor algorithm to realize gas recognition. In addition, the backpropagation-AdaBoost model combined with an electrochemical sensor array was employed to estimate the concentration of tetrahydrothiophene, an odorant in natural gas. The natural gas from the Chenghua district of Chengdu was used as the gas source to verify the reliability of the method. The experimental results show that the gas recognition rate reaches 90.17%, and the tetrahydrothiophene concentration detection average relative error reduced to 3.37%. The results demonstrate that the method can effectively improve the prediction accuracy and reduce the impact of cross-interference on the detection of tetrahydrothiophene. The method can provide technical support for natural gas odorant detection with great engineering significance for solving gas safety problems.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143543143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-temperature biaxial testing machines in aerospace.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0235131

Jinglong Zhao, Yanbin Li, Dahai Zhang, Fangzhou Lu, Qingguo Fei

引用次数: 0

Design and application of low pressure and low temperature facility to study aeronautical flame during pull-away.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0244870

M-E Clavel, W Vasquez, A Vandel, B Quevreux, S Leveneur, F Collin-Bastiani, G Cabot, B Renou

{"title":"Design and application of low pressure and low temperature facility to study aeronautical flame during pull-away.","authors":"M-E Clavel, W Vasquez, A Vandel, B Quevreux, S Leveneur, F Collin-Bastiani, G Cabot, B Renou","doi":"10.1063/5.0244870","DOIUrl":"https://doi.org/10.1063/5.0244870","url":null,"abstract":"Ignition and re-ignition in aeronautical engines are vital for ensuring operability, especially under high-altitude conditions where low pressure, low temperature, and reduced flow rates impact fuel atomization and evaporation, leading to potential flame instability or extinction. To address this, a High Altitude Re-ignition for gas Turbine (HARTur) facility is developed to replicate conditions at altitudes of up to 30 000 ft and to study the pull-away phase of re-ignition where the engine accelerates from wind-milling to idle conditions. This facility simulates thermodynamic conditions similar to those in aeronautical combustion chambers during pull-away, with pressures as low as 30 kPa and temperatures down to 248 K. HARTur has been designed to characterize the performance of rich-quench-lean injection systems through global combustion efficiency analysis and extinction limits. This study details the facility setup, calibration, and experimental results for four operating conditions during pull-away. Combustion efficiency is estimated from burned gas temperature measurements obtained via pressure drop across a nozzle at the combustion chamber exit. Operating points near atmospheric conditions achieve higher combustion efficiencies compared to low-pressure and low-temperature conditions, where the flame is more susceptible to extinguishing from minor disturbances, which narrows the pull-away corridor. In-depth local analyses of spray and flame structures, performed using advanced optical diagnostics (laser tomography, planar laser-induced fluorescence, and particle image velocimetry), revealed that low-temperature, low-pressure conditions widen spray angles, degrade atomization, and destabilize recirculation zones, leading to potential flame extinction. These findings underscore the importance of optimizing injector designs and metering strategies to enhance engine operability under extreme conditions.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143649495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reconstruction of local emissivity profile from line integrated data using Abel transform.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0242943

Apoorv Tiwari, Somita Dhal, R K Paul

引用次数: 0

Loading of the narrow line Tm MOT from a pulsed cold atomic beam.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0252998

M Yaushev, D Mishin, D Tregubov, N Kolachevsky, A Golovizin

引用次数: 0

Development of a femtosecond analytical electron microscopy based on a Schottky field emission transmission electron microscope.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0226913

Shaozheng Ji, Jiangteng Guo, Zefang Li, Ling Tong, Junqing Guo, Jingchao Liu, Ying Deng, Can Liu, Zepeng Sun, Xiang Chen, Cuntao Gao, Fang Liu, Min Feng, Xuewen Fu

{"title":"Development of a femtosecond analytical electron microscopy based on a Schottky field emission transmission electron microscope.","authors":"Shaozheng Ji, Jiangteng Guo, Zefang Li, Ling Tong, Junqing Guo, Jingchao Liu, Ying Deng, Can Liu, Zepeng Sun, Xiang Chen, Cuntao Gao, Fang Liu, Min Feng, Xuewen Fu","doi":"10.1063/5.0226913","DOIUrl":"https://doi.org/10.1063/5.0226913","url":null,"abstract":"Ultrafast transmission electron microscopy (UTEM) has gained wide applications in the nanoscale dynamics with femtosecond, even attosecond, resolution. The instrument development is still in progress to satisfy the various applications. At Nankai University, we built an UTEM with a laser-driven Schottky field emitter based on a field emission TEM (Talos200i) of Thermo Fisher Scientific. This study comprehensively examines the performance of the UTEM, including the continuous mode and ultrafast photoemission mode. The investigation focuses on optimizing brightness, temporal resolution, energy dispersion, and stability in ultrafast photoemission mode, achieving a temporal resolution of ∼200 fs and an energy dispersion of 0.7 eV with excellent stability through careful adjustments of laser parameters and equipment settings. In scanning transmission electron microscopy mode, the beam size of the photoemission mode is ∼1.4 nm at specific settings with potential for further improvement. As application examples, we illustrate the results of photoinduced structural dynamics of gold film and MoS2 thin flake by ultrafast electron diffraction. We also report the polarization dependent optical interference pattern characterized by the photoinduced near field microscopy effect in a silicon thin film sample prepared by the focused ion beam method. These findings provide valuable insights for researchers aiming to leverage the UTEM's capabilities for advanced electron microscopy applications and pave the way for future advancements in UTEM technology.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143542863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Full-image operation of fast charge exchange recombination spectroscopy with high-spatial and high-wavelength resolutions in large helical device.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0251924

T Kobayashi, M Yoshinuma, K Ida

引用次数: 0

LOGLformer: Integrating local and global characteristics for depression scale estimation from facial expressions.

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2025-03-01 DOI: 10.1063/5.0231737

Cui Cao, Lang He

{"title":"LOGLformer: Integrating local and global characteristics for depression scale estimation from facial expressions.","authors":"Cui Cao, Lang He","doi":"10.1063/5.0231737","DOIUrl":"https://doi.org/10.1063/5.0231737","url":null,"abstract":"According to a publication by the World Health Organization, depression is projected to emerge as the leading mental health issue. In the domain of affective computing, deep learning techniques are frequently employed to represent facial dynamics using both local and global perspectives for the purpose of automatic depression detection (ADD). Yet, current models overlook the crucial interplay between local and global dynamics in discerning the significant features essential for ADD. Addressing this oversight, a novel hybrid computational architecture, named LOGLFormer, has been introduced. This architecture integrates CNN-derived local attributes and transformer-sourced global patterns tailored for ADD. Within LOGLFormer, the design philosophies of ResNet and ViT inspire the CNN and transformer branches, respectively. The synergy of these branches encompasses local convolutional mechanisms, self-attention strategies, and multilayer perceptron entities. Furthermore, the intricacies arising from disparities in CNN and transformer feature sets are reconciled through the specially devised feature alignment module. Rigorous comparative analysis underscores the distinctive efficacy of the LOGLFormer in recognizing depression, notably outperforming several state-of-the-art techniques on two dedicated depression databases: AVEC2013 and AVEC2014. Code will be available at https://github.com/helang818/LOGLFormer.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 3","pages":""},"PeriodicalIF":1.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143701377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0