Review of Scientific Instruments最新文献_第9页

Neutral pressure measurement in TCV tokamak using ASDEX-type pressure gauges. 用asdex型压力表测量TCV托卡马克中性压力。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0278364

G Sun, H Reimerdes, H Elaian, M Baquero-Ruiz, B Brown, M Gospodarczyk, M Noël, E Tonello

{"title":"Neutral pressure measurement in TCV tokamak using ASDEX-type pressure gauges.","authors":"G Sun, H Reimerdes, H Elaian, M Baquero-Ruiz, B Brown, M Gospodarczyk, M Noël, E Tonello","doi":"10.1063/5.0278364","DOIUrl":"https://doi.org/10.1063/5.0278364","url":null,"abstract":"Probing the neutral gas distribution at the edge of magnetic confinement fusion devices is critical for plasma exhaust studies. In the TCV tokamak, a set of ASDEX-type hot ionization pressure gauges (APGs) has been installed for fast, in situ measurements of the neutral pressure distribution in the TCV chamber. The APGs have been calibrated against Baratron pressure gauges (BPGs) for pressures ranging from less than one mPa to several hundred mPa. A correction to account for the residual pressure in the pumped torus is proposed to improve the measurement accuracy at low pressures. APG measurements in a series of plasma discharges with varied density ramp rates are analyzed and compared with the BPG pressure measurements. APG measurements feature a significantly faster time response and extend the BPG measurement range to lower pressures. Systematically higher neutral pressures measured with APGs compared to BPGs connected to the same TCV port are attributed to the BPG's slower time response and a nonuniform neutral distribution in gauge ports during the plasma discharge. The initial APG operations in TCV have been proven successful, which validates the APG as an adequate pressure measurement technique for the upcoming TCV divertor upgrades.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144800115","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

The Simons Observatory: Large diameter and large load-capacity superconducting magnetic bearing for a millimeter-wave polarization modulator. 西蒙斯天文台：用于毫米波偏振调制器的大直径和大负载容量超导磁轴承。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0274694

Daichi Sasaki, Junna Sugiyama, Kyohei Yamada, Bryce Bixler, Yuki Sakurai, Kam Arnold, Bradley R Johnson, Akito Kusaka

{"title":"The Simons Observatory: Large diameter and large load-capacity superconducting magnetic bearing for a millimeter-wave polarization modulator.","authors":"Daichi Sasaki, Junna Sugiyama, Kyohei Yamada, Bryce Bixler, Yuki Sakurai, Kam Arnold, Bradley R Johnson, Akito Kusaka","doi":"10.1063/5.0274694","DOIUrl":"https://doi.org/10.1063/5.0274694","url":null,"abstract":"We present the design methodology and characterization of a superconducting magnetic bearing (SMB) system for the polarization modulator in the small aperture telescope-low-frequency (SAT-LF), one of the SATs of the Simons Observatory (SO) that is sensitive at 30/40 GHz. SO is a cosmic microwave background (CMB) polarization experiment, with SATs targeting the search for primordial parity-odd polarization anisotropies at degree scales. Each SAT uses a cryogenic, rotating half-wave plate (HWP) as a polarization modulator to reduce atmospheric 1/f noise and instrumental systematics. The HWP system employs an SMB, composed of a magnet and a superconductor, to provide a 550 mm clear aperture and stable 2 Hz rotation at 50 K. A challenge in the SAT-LF HWP system is the heavy 35 kg load on the SMB due to a thicker HWP than used in previous telescopes. Since the SMB stiffness is critical for maintaining HWP alignment in the telescope, we developed a quantitative prediction method using finite element simulations with H-formulation. We evaluated stiffness for various magnet and superconductor geometries, refining their dimensions. The predictions are within 9% of the measurements of the SMB system. We also showed that the SMB produces sufficiently low friction-induced heat dissipation, measured at 0.26 W during 2 Hz rotation. The design methodology and implementation of the SMB here not only provides an enabling technology for SO SAT-LF but also is a stepping stone for future CMB experiments that make use of HWP polarization modulators.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144966766","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

Development and demonstration of an active optical axis alignment method for divertor infrared thermography system in ITER. ITER导流红外热成像系统主动光轴对准方法的研制与论证。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0273766

Tomohiko Ushiki, Ryota Imazawa, Tatsuo Sugie, Kosuke Shimizu, Shunsuke Tainaka, Naoto Kasano, Hiroyuki Tachibana, Butch Buenavidez, Yuzi Katayanagi, Yoshihiko Nunoya

引用次数: 0

A Bayesian approach to time-domain photonic Doppler velocimetry analysis. 时域光子多普勒测速分析的贝叶斯方法。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0267409

J R Allison, R Bordas, J Read, G Burdiak, V Beltrán, N Joiner, H Doyle, N Hawker, J Skidmore, T Ao, A Porwitzky, D Dolan, B Farfan, C Johnson, A Hansen

{"title":"A Bayesian approach to time-domain photonic Doppler velocimetry analysis.","authors":"J R Allison, R Bordas, J Read, G Burdiak, V Beltrán, N Joiner, H Doyle, N Hawker, J Skidmore, T Ao, A Porwitzky, D Dolan, B Farfan, C Johnson, A Hansen","doi":"10.1063/5.0267409","DOIUrl":"https://doi.org/10.1063/5.0267409","url":null,"abstract":"Photonic Doppler velocimetry (PDV) is an established technique for measuring the velocities of fast-moving surfaces in high-energy-density experiments. In the standard approach to PDV analysis, the short-time Fourier transform (STFT) is used to generate a spectrogram from which the velocity history of the target is inferred. The user chooses the form, duration, and separation of the window function. Here, we present a Bayesian approach to infer the velocity directly from the PDV oscilloscope trace, without using the spectrogram for analysis. This is clearly a difficult inference problem due to the highly periodic nature of the data, but we find that with carefully chosen prior distributions for the model parameters, we can accurately recover the injected velocity from synthetic data. We validate this method using PDV data collected at the STAR two-stage light gas gun at Sandia National Laboratories, recovering shock-front velocities in quartz that are consistent with those inferred using the STFT-based approach and are interpolated across regions of low signal-to-noise data. Although this method does not rely on the same user choices as the STFT, we caution that it can be prone to misspecification if the chosen model is not sufficient to capture the velocity behavior. Analysis using posterior predictive checks can be used to establish whether a better model is required, although more complex models come with additional computational cost, often taking more than several hours to converge when sampling the Bayesian posterior. We, therefore, recommend it be viewed as a complementary method to that of the STFT-based approach.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144817423","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

Photoacoustic signal to image based convolutional neural network for defect detection. 基于光声信号到图像的卷积神经网络缺陷检测。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0275680

Zekeriya Balcı, Ahmet Mert

引用次数: 0

Development of a capacitance measurement for pulsed magnetic fields. 脉冲磁场电容测量仪的研制。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0272814

William K Peria, Shengzhi Zhang, Sangyun Lee, Gabriel Silva Freitas, Vivien S Zapf, Choongjae Won, Sang-Wook Cheong, Minseong Lee

{"title":"Development of a capacitance measurement for pulsed magnetic fields.","authors":"William K Peria, Shengzhi Zhang, Sangyun Lee, Gabriel Silva Freitas, Vivien S Zapf, Choongjae Won, Sang-Wook Cheong, Minseong Lee","doi":"10.1063/5.0272814","DOIUrl":"https://doi.org/10.1063/5.0272814","url":null,"abstract":"Capacitance measurements are crucial for probing the electrical properties of materials. In this study, we develop and implement a capacitance measurement technique optimized for pulsed magnetic fields. Our approach employs an auto-balancing bridge method, leveraging a high-bandwidth transimpedance amplifier to mitigate parasitic contributions from coaxial cables. This technique enables precise capacitance measurements in rapidly changing magnetic fields, as demonstrated in experiments on the magnetoelectric material NiCo2TeO6. The results reveal strong magnetoelectric coupling, including a pronounced hysteresis in capacitance that coincides with magnetization measurements and an enhanced energy dissipation peak at high sweep rates. Compared to traditional LCR meter measurements in DC fields, our method exhibits excellent agreement while providing additional insight into field-induced phase transitions. This work establishes a robust methodology for capacitance measurements under extreme conditions and opens new opportunities for studying multiferroic and correlated electron systems under high magnetic fields.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144966509","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

FPGA-suitable interpolated convolution centroiding algorithms for crossed-strip readout. 适合fpga的交叉条读出插值卷积质心算法。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0279491

Xiao-Yun Zuo, Jin-Kun Zheng, Jin-Yao Duan, Yang Yang, Yong-Lin Bai

引用次数: 0

Liquid sample holder for optimal fluid magnetic measurements. 液体样品保持最佳流体磁测量。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0241987

Z Boekelheide, I Koltsova, C L Dennis

引用次数: 0

Research on internal defect detection of multilayer media based on phase coherence far-focused pixel-based imaging method. 基于相位相干远聚焦像元成像方法的多层介质内部缺陷检测研究。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0280144

Shuang Liu, Huifeng Zheng, Baoming Peng, Cheng Hang, Guoyang Teng, Chenlong Yang

{"title":"Research on internal defect detection of multilayer media based on phase coherence far-focused pixel-based imaging method.","authors":"Shuang Liu, Huifeng Zheng, Baoming Peng, Cheng Hang, Guoyang Teng, Chenlong Yang","doi":"10.1063/5.0280144","DOIUrl":"https://doi.org/10.1063/5.0280144","url":null,"abstract":"In ultrasonic inspection of internal defects within multilayer media, traditional amplitude-based imaging methods frequently suffer from low signal-to-noise ratio (SNR) and inconsistent defect characterization, particularly for identically sized flaws at varying depths, primarily due to interface reflections and material attenuation. To address these challenges, a phase-coherent far-focused pixel-based (PC-FPB) imaging algorithm is proposed in this paper. This method constructs coherent imaging signals using a vector coherence factor and introduces a novel scan-line-based coherence modulation strategy. A dynamic threshold is statistically determined from the distribution of maximum coherence factors across scan lines and applied through a multiplicative fusion mechanism to selectively enhance coherent defect signals and suppress background noise. Experimental validation on multilayer structures demonstrates that the imaging intensity and SNR for deep-seated defects are significantly enhanced by the PC-FPB imaging algorithm. Comparative results further indicate that it outperforms conventional amplitude-based methods in the detection of deep defects. For single-hole imaging, the defect amplitude was improved by 9.8 dB and the image SNR increased by 7.7 dB. In multi-hole imaging, the maximum quantification error for defects with a diameter of 1 mm was recorded at 0.245 mm2, demonstrating a high degree of consistency in the imaging of identically sized defects at varying depths. Furthermore, the average SNR of defects at various depths increased by 15 dB and the average lateral resolution improved by 53.4%. The findings confirm that PC-FPB effectively overcomes the limitations of traditional methods and enhances defect detection in multilayer structures.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"96 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144966677","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

An inflatable "finger-lock" for stabilizing nailfold capillary videos and modulating blood flow velocities. 一种可充气的“指锁”，用于稳定甲襞毛细血管视频和调节血流速度。

IF 1.7 4区工程技术

Review of Scientific Instruments Pub Date : 2025-08-01 DOI: 10.1063/5.0267558

Marcus L Forst, Gabriela Rincon, Juliette H Levy, David N Cornfield, Stephen R Quake

引用次数: 0