O. Borovkova, H. Hashim, M. Kozhaev, S. Dagesyan, A. Chakravarty, M. Levy, V. Belotelov
Ultra-thin magnetic dielectric films are of prime importance due to their applications for nanophotonics and spintronics. Here, we propose an efficient method for the magneto-optical investigation of ultra-thin magnetic films which allows one to access their state of magnetization and magneto-optical properties. It is based on the surface-plasmon-polariton-assisted transverse magneto-optical Kerr effect (TMOKE). In our experiments, sub-100 nm-thick bismuth-substituted lutetium iron-garnet films covered with a plasmonic gold grating have been analyzed. The excitation of surface plasmon-polaritons provides resonance enhancement of TMOKE up to 0.04 and makes it easily detectable in the experiment. For films thicker than 40 nm, the TMOKE marginally depends on the film thickness. A further decrease in the film thickness diminishes TMOKE since for such thicknesses the surface plasmon-polariton field partly penetrates inside the non-magnetic substrate. Nevertheless, the TMOKE remains measurable even for few-nm-thick films, which makes this technique unique for the magneto-optical study of ultra-thin films. Particularly, the proposed method reveals that the off-diagonal components of the magnetic film permittivity tensor grow slightly with the reduction of the film thickness.
{"title":"TMOKE as efficient tool for the magneto-optic analysis of ultra-thin magnetic films","authors":"O. Borovkova, H. Hashim, M. Kozhaev, S. Dagesyan, A. Chakravarty, M. Levy, V. Belotelov","doi":"10.1063/1.5012873","DOIUrl":"https://doi.org/10.1063/1.5012873","url":null,"abstract":"Ultra-thin magnetic dielectric films are of prime importance due to their applications for nanophotonics and spintronics. Here, we propose an efficient method for the magneto-optical investigation of ultra-thin magnetic films which allows one to access their state of magnetization and magneto-optical properties. It is based on the surface-plasmon-polariton-assisted transverse magneto-optical Kerr effect (TMOKE). In our experiments, sub-100 nm-thick bismuth-substituted lutetium iron-garnet films covered with a plasmonic gold grating have been analyzed. The excitation of surface plasmon-polaritons provides resonance enhancement of TMOKE up to 0.04 and makes it easily detectable in the experiment. For films thicker than 40 nm, the TMOKE marginally depends on the film thickness. A further decrease in the film thickness diminishes TMOKE since for such thicknesses the surface plasmon-polariton field partly penetrates inside the non-magnetic substrate. Nevertheless, the TMOKE remains measurable even for few-nm-thick films, which makes this technique unique for the magneto-optical study of ultra-thin films. Particularly, the proposed method reveals that the off-diagonal components of the magnetic film permittivity tensor grow slightly with the reduction of the film thickness.","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87705280","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}
Pub Date : 2018-01-22DOI: 10.1007/978-3-319-92726-8_2
I. Stern, N. Sullivan, David B. Tanner
{"title":"Symmetry Breaking in Haloscope Microwave Cavities","authors":"I. Stern, N. Sullivan, David B. Tanner","doi":"10.1007/978-3-319-92726-8_2","DOIUrl":"https://doi.org/10.1007/978-3-319-92726-8_2","url":null,"abstract":"","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"1 1","pages":"21-29"},"PeriodicalIF":0.0,"publicationDate":"2018-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88591788","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}
Pub Date : 2018-01-03DOI: 10.1007/978-981-10-7665-7_2
T. Ghosh
{"title":"Detectors for Nuclear Physics","authors":"T. Ghosh","doi":"10.1007/978-981-10-7665-7_2","DOIUrl":"https://doi.org/10.1007/978-981-10-7665-7_2","url":null,"abstract":"","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"14 1","pages":"15-27"},"PeriodicalIF":0.0,"publicationDate":"2018-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79188199","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}
Pub Date : 2018-01-01DOI: 10.3964/j.issn.1000-0593(2018)01-0308-06
王圣浩, 刘世杰, 王微微, 张志刚
In this paper, based on the framework of traditional spectrophotometry, we put forward a novel fast and high-accuracy technique for measuring transmittance spectrum in VIS-NIR wave range, its key feature is that during the measurement procedure, the output wavelength of the grating monochromator is kept increasing continuously and at the same time, the photoelectric detectors execute a concurrently continuous data acquisition routine. Initial experiment result shows that the newly proposed technique could shorten the time consumed for measuring the transmittance spectrum down to 50% that of the conventional spectrophotometric method, a relative error of 0.070% and a repeatability error of 0.042% are generated. Compared with the current mostly used techniques (spectrophotometry, methods based on multi-channel spectrometer and strategy using Fourier transform spectrometer) for obtaining transmittance spectrum in VIS-NIR, the new strategy has at all once the following advantages, firstly the measuring speed could be greatly quicken, fast measurement of transmittance spectrum in VIS-NIR is therefore promising, which would find wide application in dynamic environment, secondly high measuring accuracy (0.1%-0.3%) is available, and finally the measuring system has high mechanical stability because the motor of the grating monochromator is rotating continuously during the measurement.
{"title":"快速、 高精度可见光-近红外透射光谱测量技术研究","authors":"王圣浩, 刘世杰, 王微微, 张志刚","doi":"10.3964/j.issn.1000-0593(2018)01-0308-06","DOIUrl":"https://doi.org/10.3964/j.issn.1000-0593(2018)01-0308-06","url":null,"abstract":"In this paper, based on the framework of traditional spectrophotometry, we put forward a novel fast and high-accuracy technique for measuring transmittance spectrum in VIS-NIR wave range, its key feature is that during the measurement procedure, the output wavelength of the grating monochromator is kept increasing continuously and at the same time, the photoelectric detectors execute a concurrently continuous data acquisition routine. Initial experiment result shows that the newly proposed technique could shorten the time consumed for measuring the transmittance spectrum down to 50% that of the conventional spectrophotometric method, a relative error of 0.070% and a repeatability error of 0.042% are generated. Compared with the current mostly used techniques (spectrophotometry, methods based on multi-channel spectrometer and strategy using Fourier transform spectrometer) for obtaining transmittance spectrum in VIS-NIR, the new strategy has at all once the following advantages, firstly the measuring speed could be greatly quicken, fast measurement of transmittance spectrum in VIS-NIR is therefore promising, which would find wide application in dynamic environment, secondly high measuring accuracy (0.1%-0.3%) is available, and finally the measuring system has high mechanical stability because the motor of the grating monochromator is rotating continuously during the measurement.","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"99 6 1","pages":"308"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83619241","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}
V. Guiseppe, C. Christofferson, Kaitlyn Hair, F. M. Adams
The next generation low-background detectors operating deep underground aim for unprecedented low levels of radioactive backgrounds. The deposition and presence of radon progeny on detector surfaces is an added source of energetic background events. In addition to limiting the detector material’s radon exposure in order to reduce potential surface backgrounds, it is just as important to clean surfaces to remove inevitable contamination. Such studies of radon progeny removal have generally found that a form of etching is effective at removing some of the progeny (Bi and Pb), however more aggressive techniques, including electropolishing, have been shown to effectively remove the Po atoms. In the absence of an aggressive etch, a significant fraction of the Po atoms are believed to either remain behind within the surface or redeposit from the etching solution back onto the surface. We explore the chemical nature of the aqueous Po ions and the effect of the oxidation state of Po to maximize the Po ions remaining in the etching solution of contaminated Cu surfaces. We present a review of the previous studies of surface radon progeny removal and our findings on the role of oxidizing agents and a cell potential in the preparation of a clean etching technique.The next generation low-background detectors operating deep underground aim for unprecedented low levels of radioactive backgrounds. The deposition and presence of radon progeny on detector surfaces is an added source of energetic background events. In addition to limiting the detector material’s radon exposure in order to reduce potential surface backgrounds, it is just as important to clean surfaces to remove inevitable contamination. Such studies of radon progeny removal have generally found that a form of etching is effective at removing some of the progeny (Bi and Pb), however more aggressive techniques, including electropolishing, have been shown to effectively remove the Po atoms. In the absence of an aggressive etch, a significant fraction of the Po atoms are believed to either remain behind within the surface or redeposit from the etching solution back onto the surface. We explore the chemical nature of the aqueous Po ions and the effect of the oxidation state of Po to maximize the Po ions remain...
{"title":"A review and outlook for the removal of radon-generated Po-210 surface contamination","authors":"V. Guiseppe, C. Christofferson, Kaitlyn Hair, F. M. Adams","doi":"10.1063/1.5019006","DOIUrl":"https://doi.org/10.1063/1.5019006","url":null,"abstract":"The next generation low-background detectors operating deep underground aim for unprecedented low levels of radioactive backgrounds. The deposition and presence of radon progeny on detector surfaces is an added source of energetic background events. In addition to limiting the detector material’s radon exposure in order to reduce potential surface backgrounds, it is just as important to clean surfaces to remove inevitable contamination. Such studies of radon progeny removal have generally found that a form of etching is effective at removing some of the progeny (Bi and Pb), however more aggressive techniques, including electropolishing, have been shown to effectively remove the Po atoms. In the absence of an aggressive etch, a significant fraction of the Po atoms are believed to either remain behind within the surface or redeposit from the etching solution back onto the surface. We explore the chemical nature of the aqueous Po ions and the effect of the oxidation state of Po to maximize the Po ions remaining in the etching solution of contaminated Cu surfaces. We present a review of the previous studies of surface radon progeny removal and our findings on the role of oxidizing agents and a cell potential in the preparation of a clean etching technique.The next generation low-background detectors operating deep underground aim for unprecedented low levels of radioactive backgrounds. The deposition and presence of radon progeny on detector surfaces is an added source of energetic background events. In addition to limiting the detector material’s radon exposure in order to reduce potential surface backgrounds, it is just as important to clean surfaces to remove inevitable contamination. Such studies of radon progeny removal have generally found that a form of etching is effective at removing some of the progeny (Bi and Pb), however more aggressive techniques, including electropolishing, have been shown to effectively remove the Po atoms. In the absence of an aggressive etch, a significant fraction of the Po atoms are believed to either remain behind within the surface or redeposit from the etching solution back onto the surface. We explore the chemical nature of the aqueous Po ions and the effect of the oxidation state of Po to maximize the Po ions remain...","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"15 1","pages":"070003"},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84882561","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}
Rita F. Sonka, J. Bock, K. Megerian, B. Steinbach, A. Turner, Cheng Zhang
We study the mechanism of instability in transition edge sensor (TES) bolometers used for ground based observations of the Cosmic Microwave Background (CMB) at 270GHz. The instability limits the range of useful operating resistances of the TES down to ≈50% of R_n, and due to variations in detector properties and optical loading within a column of multiplexed detectors, limits the effective on sky yield. Using measurements of the electrical impedance of the detectors, we show the instability is due to the increased bolometer leg G for higher-frequency detection inducing decoupling of the palladium-gold heat capacity from the thermistor. We demonstrate experimentally that the limiting thermal resistance is due to the small cross sectional area of the silicon nitride bolometer island, and so is easily fixed by layering palladium-gold over an oxide protected TES. The resulting detectors can be biased down to a resistance ≈10% of R_n.
{"title":"Characterization and Improvement of the Thermal Stability of TES Bolometers","authors":"Rita F. Sonka, J. Bock, K. Megerian, B. Steinbach, A. Turner, Cheng Zhang","doi":"10.7907/4V3D-7K67.","DOIUrl":"https://doi.org/10.7907/4V3D-7K67.","url":null,"abstract":"We study the mechanism of instability in transition edge sensor (TES) bolometers used for ground based observations of the Cosmic Microwave Background (CMB) at 270GHz. The instability limits the range of useful operating resistances of the TES down to ≈50% of R_n, and due to variations in detector properties and optical loading within a column of multiplexed detectors, limits the effective on sky yield. Using measurements of the electrical impedance of the detectors, we show the instability is due to the increased bolometer leg G for higher-frequency detection inducing decoupling of the palladium-gold heat capacity from the thermistor. We demonstrate experimentally that the limiting thermal resistance is due to the small cross sectional area of the silicon nitride bolometer island, and so is easily fixed by layering palladium-gold over an oxide protected TES. The resulting detectors can be biased down to a resistance ≈10% of R_n.","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88038403","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}
B. Battaglieri, A. Celentano, R. Vita, E. Izaguirre, G. Krnjaic, E. Smith, S. Stepanyan, A. Bersani, E. Fanchini, S. Fegan, P. Musico, M. Osipenko, M. Ripani, E. Santopinto, M. Taiuti, P. Schuster, N. Toro, M. Dalton, A. Freyberger, F. Girod, V. Kubarovsky, M. Ungaro, G. Cataldo, R. Leo, D. Bari, L. Lagamba, E. Nappi, R. Perrino, M. Carpinelli, V. Sipala, S. Aiello, V. Bellini, M. Napoli, A. Giusa, F. Mammoliti, E. Leonora, F. Noto, N. Randazzo, G. Russo, M. Sperduto, C. Sutera, C. Ventura, L. Barion, G. Ciullo, M. Contalbrigo, P. Lenisa, A. Movsisyan, F. Spizzo, M. Turisini, F. D. Persio, E. Cisbani, C. Fanelli, F. Garibaldi, F. Meddi, G. Urciuoli, S. Pereira, E. Sanctis, D. Hasch, V. Lucherini, M. Mirazita, R. Montgomery, S. Pisano, G. Simi, A. D’Angelo, L. Lanza, Alessandro Rizzo, C. Schaerf, I. Zonta, D. Calvo, A. Filippi, M.Holtrop, R. Peremuzyan, D. Glazier, D. Ireland, B. Mckinnon, D. S. Afanasev, B. Briscoe, N. Kalantarians, Lamiaa El Fassi, L.Weinstein, P. Beltrame, A. Murphy, D. Watts, L. Zana,
This document is an update to the proposal PR12-16-001 Dark matter search in a Beam-Dump eXperiment (BDX) at Jefferson Lab submitted to JLab-PAC44 in 2016 reporting progress in addressing questions raised regarding the beam-on backgrounds. The concerns are addressed by adopting a new simulation tool, FLUKA, and planning measurements of muon fluxes from the dump with its existing shielding around the dump. First, we have implemented the detailed BDX experimental geometry into a FLUKA simulation, in consultation with experts from the JLab Radiation Control Group. The FLUKA simulation has been compared directly to our GEANT4 simulations and shown to agree in regions of validity. The FLUKA interaction package, with a tuned set of biasing weights, is naturally able to generate reliable particle distributions with very small probabilities and therefore predict rates at the detector location beyond the planned shielding around the beam dump. Second, we have developed a plan to conduct measurements of the muon ux from the Hall-A dump in its current configuration to validate our simulations.
{"title":"Dark matter search in a Beam-Dump eXperiment (BDX) at Jefferson Lab: an update on PR12-16-001","authors":"B. Battaglieri, A. Celentano, R. Vita, E. Izaguirre, G. Krnjaic, E. Smith, S. Stepanyan, A. Bersani, E. Fanchini, S. Fegan, P. Musico, M. Osipenko, M. Ripani, E. Santopinto, M. Taiuti, P. Schuster, N. Toro, M. Dalton, A. Freyberger, F. Girod, V. Kubarovsky, M. Ungaro, G. Cataldo, R. Leo, D. Bari, L. Lagamba, E. Nappi, R. Perrino, M. Carpinelli, V. Sipala, S. Aiello, V. Bellini, M. Napoli, A. Giusa, F. Mammoliti, E. Leonora, F. Noto, N. Randazzo, G. Russo, M. Sperduto, C. Sutera, C. Ventura, L. Barion, G. Ciullo, M. Contalbrigo, P. Lenisa, A. Movsisyan, F. Spizzo, M. Turisini, F. D. Persio, E. Cisbani, C. Fanelli, F. Garibaldi, F. Meddi, G. Urciuoli, S. Pereira, E. Sanctis, D. Hasch, V. Lucherini, M. Mirazita, R. Montgomery, S. Pisano, G. Simi, A. D’Angelo, L. Lanza, Alessandro Rizzo, C. Schaerf, I. Zonta, D. Calvo, A. Filippi, M.Holtrop, R. Peremuzyan, D. Glazier, D. Ireland, B. Mckinnon, D. S. Afanasev, B. Briscoe, N. Kalantarians, Lamiaa El Fassi, L.Weinstein, P. Beltrame, A. Murphy, D. Watts, L. Zana, ","doi":"10.2172/1431583","DOIUrl":"https://doi.org/10.2172/1431583","url":null,"abstract":"This document is an update to the proposal PR12-16-001 Dark matter search in a Beam-Dump eXperiment (BDX) at Jefferson Lab submitted to JLab-PAC44 in 2016 reporting progress in addressing questions raised regarding the beam-on backgrounds. The concerns are addressed by adopting a new simulation tool, FLUKA, and planning measurements of muon fluxes from the dump with its existing shielding around the dump. First, we have implemented the detailed BDX experimental geometry into a FLUKA simulation, in consultation with experts from the JLab Radiation Control Group. The FLUKA simulation has been compared directly to our GEANT4 simulations and shown to agree in regions of validity. The FLUKA interaction package, with a tuned set of biasing weights, is naturally able to generate reliable particle distributions with very small probabilities and therefore predict rates at the detector location beyond the planned shielding around the beam dump. Second, we have developed a plan to conduct measurements of the muon ux from the Hall-A dump in its current configuration to validate our simulations.","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87481943","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}
Pub Date : 2017-11-30DOI: 10.3390/INSTRUMENTS2010003
M. Auger, Y. Chen, A. Ereditato, D. Goeldi, I. Kreslo, D. Lorca, M. Luethi, T. Mettler, J. Sinclair, M. Weber
ArCLight is a novel device for detecting scintillation light over large areas with Photon Detection Efficiency (PDE) of the order of a few percent. Its robust technological design allows for efficient use in large-volume particle detectors, such as Liquid Argon Time Projection Chambers (LArTPCs) or liquid scintillator detectors. Due to its dielectric structure it can be placed inside volumes with high electric field. It could potentially replace vacuum PhotoMultiplier Tubes (PMTs) in applications where high PDE is not required.
{"title":"ArCLight - a Compact Dielectric Large-Area Photon Detector","authors":"M. Auger, Y. Chen, A. Ereditato, D. Goeldi, I. Kreslo, D. Lorca, M. Luethi, T. Mettler, J. Sinclair, M. Weber","doi":"10.3390/INSTRUMENTS2010003","DOIUrl":"https://doi.org/10.3390/INSTRUMENTS2010003","url":null,"abstract":"ArCLight is a novel device for detecting scintillation light over large areas with Photon Detection Efficiency (PDE) of the order of a few percent. Its robust technological design allows for efficient use in large-volume particle detectors, such as Liquid Argon Time Projection Chambers (LArTPCs) or liquid scintillator detectors. Due to its dielectric structure it can be placed inside volumes with high electric field. It could potentially replace vacuum PhotoMultiplier Tubes (PMTs) in applications where high PDE is not required.","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"161 11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83273250","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}
C. Christofferson, N. Abgrall, S. Alvis, I. Arnquist, F. Avignone, A. Barabash, C. Barton, F. Bertrand, T. Bode, A. Bradley, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Y. Chan, P. Chu, C. Cuesta, J. Detwiler, C. Dunagan, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, L. Hehn, R. Henning, E. Hoppe, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, C. O'Shaughnessy, G. Othman, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, R. Robertson, N. Rouf, B. Shanks, M. Shirchenko, A. Suriano, D. Tedeschi, J. Trimble, R. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, C.-H. Yu, V. Yumatov, I. Zhitnikov, B. Zhu
The Majorana Demonstrator is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The Demonstrator has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and p...
{"title":"Contamination control and assay results for the Majorana Demonstrator ultra clean components","authors":"C. Christofferson, N. Abgrall, S. Alvis, I. Arnquist, F. Avignone, A. Barabash, C. Barton, F. Bertrand, T. Bode, A. Bradley, V. Brudanin, M. Busch, M. Buuck, T. Caldwell, Y. Chan, P. Chu, C. Cuesta, J. Detwiler, C. Dunagan, Y. Efremenko, H. Ejiri, S. Elliott, T. Gilliss, G. Giovanetti, M. Green, J. Gruszko, I. Guinn, V. Guiseppe, C. Haufe, L. Hehn, R. Henning, E. Hoppe, M. Howe, K. Keeter, M. Kidd, S. Konovalov, R. Kouzes, A. M. Lopez, R. Martin, R. Massarczyk, S. Meijer, S. Mertens, J. Myslik, C. O'Shaughnessy, G. Othman, A. Poon, D. Radford, J. Rager, A. Reine, K. Rielage, R. Robertson, N. Rouf, B. Shanks, M. Shirchenko, A. Suriano, D. Tedeschi, J. Trimble, R. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. White, J. Wilkerson, C. Wiseman, W. Xu, E. Yakushev, C.-H. Yu, V. Yumatov, I. Zhitnikov, B. Zhu","doi":"10.1063/1.5019001","DOIUrl":"https://doi.org/10.1063/1.5019001","url":null,"abstract":"The Majorana Demonstrator is a neutrinoless double beta decay experiment utilizing enriched Ge-76 detectors in 2 separate modules inside of a common solid shield at the Sanford Underground Research Facility. The Demonstrator has utilized world leading assay sensitivities to develop clean materials and processes for producing ultra-pure copper and plastic components. This experiment is now operating, and initial data provide new insights into the success of cleaning and processing. Post production copper assays after the completion of Module 1 showed an increase in U and Th contamination in finished parts compared to starting bulk material. A revised cleaning method and additional round of surface contamination studies prior to Module 2 construction have provided evidence that more rigorous process control can reduce surface contamination. This article describes the assay results and discuss further studies to take advantage of assay capabilities for the purpose of maintaining ultra clean fabrication and p...","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"40 1","pages":"060005"},"PeriodicalIF":0.0,"publicationDate":"2017-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81376703","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}
X. Liu, W. Guo, Y. Wang, M. Dai, L. Wei, B. Dober, C. Mckenney, G. Hilton, J. Hubmayr, J. Austermann, J. Ullom, J. Gao, M. Vissers
We present a wafer trimming technique for producing superconducting micro-resonator arrays with highly uniform frequency spacing. With the light-emitting diode (LED) mapper technique demonstrated previously, we first map the measured resonance frequencies to the physical resonators. Then, we fine-tune each resonator's frequency by lithographically trimming a small length, calculated from the deviation of the measured frequency from its design value, from the interdigitated capacitor. We demonstrate this technique on a 127-resonator array made of titanium-nitride (TiN) and show that the uniformity of frequency spacing is greatly improved. The array yield in terms of frequency collisions improves from 84% to 97%, while the quality factors and noise properties are unaffected. The wafer trimming technique provides an easy-to-implement tool to improve the yield and multiplexing density of large resonator arrays, which is important for various applications in photon detection and quantum computing.
{"title":"Superconducting micro-resonator arrays with ideal frequency spacing and extremely low frequency collision rate","authors":"X. Liu, W. Guo, Y. Wang, M. Dai, L. Wei, B. Dober, C. Mckenney, G. Hilton, J. Hubmayr, J. Austermann, J. Ullom, J. Gao, M. Vissers","doi":"10.1063/1.5016190","DOIUrl":"https://doi.org/10.1063/1.5016190","url":null,"abstract":"We present a wafer trimming technique for producing superconducting micro-resonator arrays with highly uniform frequency spacing. With the light-emitting diode (LED) mapper technique demonstrated previously, we first map the measured resonance frequencies to the physical resonators. Then, we fine-tune each resonator's frequency by lithographically trimming a small length, calculated from the deviation of the measured frequency from its design value, from the interdigitated capacitor. We demonstrate this technique on a 127-resonator array made of titanium-nitride (TiN) and show that the uniformity of frequency spacing is greatly improved. The array yield in terms of frequency collisions improves from 84% to 97%, while the quality factors and noise properties are unaffected. The wafer trimming technique provides an easy-to-implement tool to improve the yield and multiplexing density of large resonator arrays, which is important for various applications in photon detection and quantum computing.","PeriodicalId":8827,"journal":{"name":"arXiv: Instrumentation and Detectors","volume":"33 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91456445","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}
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