A free-standing thin foil bolometer for measuring soft x-ray fluence
A free-standing thin foilbolometer formeasuring softx-ray fluence inz-pinch experiments is developed. For the first time, we present the determination of its sensitivity by different methods. The results showed great consistency for the different methods, which confirms the validity of the sensitivity and provides confidence for its application inz-pinch experiments. It should be highlighted that the sensitivity of a free-standing foilbolometer could be calibrated directly using Joule heating without any corrections that will be necessary for a foilbolometer with substrate because of heat loss. The difference of the wavefo...
Source: Review of Scientific Instruments - October 4, 2016 Category: Physics Authors: Qingyuan Hu, Jiamin Ning, Fan Ye, Shijian Meng, Rongkun Xu, Jianlun Yang, Yanyun Chu, Yi Qin, Yuecheng Fu, Faxin Chen and Zeping Xu Source Type: research
Development of fast neutron pinhole camera using nuclear emulsion for neutron emission profile measurement in KSTAR
We have developed a compact fastneutroncamera based on a stack ofnuclear emulsion plates and a pinholecollimator. Thecamera was installed at J-port of Korea superconducting tokamak advanced research at National Fusion Research Institute, Republic of Korea. Fastneutronimages agreed better with calculated ones based onMonte Carloneutron simulation using the uniform distribution of Deuterium-Deuterium (DD)neutron source in a torus of 40 cm radius. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - October 4, 2016 Category: Physics Authors: Y. Izumi, H. Tomita, Y. Nakayama, S. Hayashi, K. Morishima, M. Isobe, M. S. Cheon, K. Ogawa, T. Nishitani, T. Naka, T. Nakano, M. Nakamura and T. Iguchi Source Type: research
The progress in development of edge tangential Thomson scattering system on HL-2A tokamak
The edge tangential Thomsonscattering system (ETTSS) was developed for the first time on a HL-2Atokamak. A Nd:YAG laser with a 1064 nm wavelength, 4 J energy, and 30 Hz repetition rate is employed on the ETTSS. Thelaser beam injects the plasma in the tangential direction on the mid-plane of the machine, and the angles between the laser injection direction and thescattered light collection direction are in the range from 157.5 ° to 162.8°. Thescattered light collectionoptics with 0.21-0.47 magnification is utilized to collect thescattered light ofmeasurement range from R = 1900 mm to 2100 mm (the normalized radius is from...
Source: Review of Scientific Instruments - October 4, 2016 Category: Physics Authors: C. H. Liu, Y. Huang, Y. Q. Wang, Z. Feng, Z. P. Hou and B. Z. Fu Source Type: research
Extending helium partial pressure measurement technology to JET DTE2 and ITER
The detection limit for helium (He) partial pressure monitoring via thePenning discharge optical emissiondiagnostic, mainly used fortokamakdivertor effluent gasanalysis, is shown here to be possible for He concentrations down to 0.1% in predominantly deuterium effluents. This result from a dedicated laboratory study means that the technique can now be extended to intrinsically (non-injected) He produced as fusion reaction ash in deuterium-tritium experiments. The paper also examines thresholdionization mass spectroscopy as a potential backup to the optical technique, but finds that further development is needed to attain w...
Source: Review of Scientific Instruments - October 4, 2016 Category: Physics Authors: C. C. Klepper, T. M. Biewer, U. Kruezi, S. Vartanian, D. Douai, D. L. Hillis, C. Marcus and JET Contributors Source Type: research
Erratum: “Degradation/oxidation susceptibility of organic photovoltaic cells in aqueous solutions” [Rev. Sci. Instrum. 86, 124101 (2015)]
(Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: K. Habib, A. Husain and A. Al-Hazza Source Type: research
Note: Modified π-type Butterworth-Van Dyke model for dual-mode Lamb-wave resonator with precise two-port Y-parameter characterizations
Dual-mode Lamb-waveresonator has become a powerful component forclock reference and sensing applications, enabling efficient compensations oftemperature effects, concurrentmeasurements of multiple environmental parameters, etc. An equivalent circuitmodel for the dual-mode Lamb-waveresonator is indispensable as it provides a means as well as being an effective tool for evaluating device characteristics and to aid the designing of circuitry for theresonators. This could be the first time ever that an efficient equivalent-circuitmodel, i.e., modified π-type Butterworth-Van Dykemodel for dual-mode Lamb-waveresonators is repor...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: Yong Wang, Yan Hong, Wang Ling Goh and Xiaojing Mu Source Type: research
A single-pulse shock tube coupled with high-repetition-rate time-of-flight mass spectrometry and gas chromatography for high-temperature gas-phase kinetics studies
Shock tubes are frequently used to investigate the kinetics of chemical reactions in the gas phase at high temperatures. Conventionally, two complementary arrangements are used where eithertime-resolved intermediate speciesmeasurements are conducted after the initiation of thereaction or where the product composition is determined after rapid initiation and quenching of thereaction through gas-dynamic processes. This paper presents a facility that combines both approaches to determine comprehensive information. A single-pulseshock tube is combined with high-sensitivity gas chromatography/mass spectrometry for product compo...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: P. Sela, B. Shu, M. Aghsaee, J. Herzler, O. Welz, M. Fikri and C. Schulz Source Type: research
Novel control modes to improve the performance of rectilinear ion trap mass spectrometer with dual pressure chambers
The rectilinearion trap (RIT) has gradually become one of the preferred massanalyzers for portablemass spectrometers because of its simple configuration. In order to enhance the performance, including sensitivity, quantitation capability, throughput, and resolution, a novel RITmass spectrometer with dualpressurechambers was designed and characterized. The studied system constituted aquadrupole linearion trap (QLIT) in the firstchamber and a RIT in the secondchamber. Two controlmodes are hereby proposed: StorageQuadrupole Linear Ion Trap-RectilinearIon Trap (SQLIT-RIT)mode, in which the QLIT was used athigh pressure for ion...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: Xinming Huo, Fei Tang, Xiaohua Zhang, Jin Chen, Yan Zhang, Cheng ’an Guo and Xiaohao Wang Source Type: research
Ultra-low-frequency vertical vibration isolator based on a two-stage beam structure for absolute gravimetry
To reduce seismic and environmental vibration noise, ultra-low-frequency verticalvibration isolation systems play an important role in absolute gravimetry. For this purpose, an isolator based on a two-stage beam structure is proposed and demonstrated. The isolator has a simpler and more robust structure than the present ultra-low-frequency vertical activevibration isolators. In the system, two beams are connected to a frame using flexural pivots. The upper beam is suspended from the frame with a normal hex spring and the lower beam is suspended from the upper one using a zero-length spring. The pivot of the upper beam is n...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: G. Wang, K. Wu, H. Hu, G. Li and L. J. Wang Source Type: research
Open microwave cavity for use in a Purcell enhancement cooling scheme
Amicrowavecavity is described which can be used to cool lepton plasmas for potential use in synthesis of antihydrogen. The cooling scheme is an incarnation of thePurcell effect: when plasmas are coupled to amicrowavecavity, the plasma cooling rate isresonantly enhanced through increased spontaneous emission of cyclotron radiation. Thecavity forms a threeelectrode section of a Penning-Malmberg trap and has a bulged cylindrical geometry with open ends aligned with the magnetic trapping axis. This allows plasmas to be injected and removed from thecavity without the need for moving parts while maintaining high quality factors ...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: N. Evetts, I. Martens, D. Bizzotto, D. Longuevergne and W. N. Hardy Source Type: research
The design and analysis of channel transmission communication system of XCTD profiler
In this paper, a channel transmission communication system of expendable conductivity-temperature-depth is established in accordance to the operation characteristics of the transmission line to more accurately assess the characteristics of deep-sea abandoned profiler channel. The wrappinginductance is eliminated to maximum extent through the wrapping pattern of the underwater spool and the overwater spool and the calculation of the wrapping diameter. The feasibility of the proposed channel transmission communication system is verified throughtheoreticalanalysis and practicalmeasurement of the transmission signal error rate...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: Yu Zheng, Xiao-Rui Wang, Xiang-Yu Jin, Guo-Min Song, Ying-Sheng Shang and Hong-Zhi Li Source Type: research
Asymmetry parameter of peaked Fano line shapes
Thespectroscopicline shape of electronic and vibrationalexcitations is ubiquitously described by a Fano profile. In the case of nearly symmetric and peaked Fanoline shapes, the fit of the conventional Fano function to experimental data leads to difficulties in unambiguously extracting the asymmetry parameter, which may vary over orders of magnitude without degrading the quality of the fit. Moreover, the extracted asymmetry parameter depends on initially guessed values. Using thespectroscopic signature of the single-CoKondo effect on Au(110) the ambiguity of the extracted asymmetry parameter is traced to the highly symmetri...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: S. Meierott, T. Hotz, N. N éel and J. Kröger Source Type: research
A two-dimensional angular-resolved proton spectrometer
We present a novel design of two-dimensional (2D) angular-resolved spectrometer for full beam characterization of ultrashort intense laser drivenproton sources. A rotated 2D pinhole array was employed, as selective entrance before a pair of parallel permanent magnets, to sample the fullproton beam into discrete beamlets. Theproton beamlets are subsequently dispersed without overlapping onto a planardetector. Representative experimental result ofprotons generated from femtosecond intense laser interaction with thin foil target is presented. (Source: Review of Scientific Instruments)
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: Su Yang, Xiaohui Yuan, Yuan Fang, Xulei Ge, Yanqing Deng, Wenqing Wei, Jian Gao, Feichao Fu, Tao Jiang, Guoqian Liao, Feng Liu, Min Chen, Yutong Li, Li Zhao, Yanyun Ma, Zhengming Sheng and Jie Zhang Source Type: research
Highly compact and easy-to-use optical chip interferometer with picometric performances
In this paper, we present a compact, inexpensive, and easy-to-use optical chipinterferometer based on thetelecom integratedwaveguidetechnology. The measurement evaluation is focused on the resolution and the noise level of thesensor. The power spectral density of 100fm Hz−1/2 @ 10 kHz is reached in static conditions. The same level is obtained with the standard Allan deviation for both short and long term measurements. Dynamic performances are also evaluated with sub-nanometer measurements made withpiezoelectric systems. The potential bandwidth of thesensor is very high and is currently only limited by electronics (250 k...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: W. A. Merzouk, B. Cagneau, F. Gardillou, K. Hilouane and L. Chassagne Source Type: research
Time-resolved ARPES with sub-15 fs temporal and near Fourier-limited spectral resolution
An experimental setup for time- and angle-resolved photoelectron spectroscopy with sub-15 fs temporal resolution is presented. A hollow-fibercompressor is used for the generation of 6.5 fs white light pump pulses, and a high-harmonic-generation source delivers 11 fs probe pulses at a photon energy of 22.1 eV. A value of 13 fs full width at half-maximum of the pump-probe cross correlation signal is determined by analyzing aphotoemission intensity transient probing a near-infrared interband transition in 1T-TiSe2. Notably, the energy resolution of the setup conforms to typical values reported in conventional time-resolvedpho...
Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: G. Rohde, A. Hendel, A. Stange, K. Hanff, L.-P. Oloff, L. X. Yang, K. Rossnagel and M. Bauer Source Type: research
