Search results for "Instrument"

Prospects for beyond the Standard Model physics searches at the Deep Underground Neutrino Experiment

2021

The Deep Underground Neutrino Experiment (DUNE) will be a powerful tool for a variety of physics topics. The high-intensity proton beams provide a large neutrino flux, sampled by a near detector system consisting of a combination of capable precision detectors, and by the massive far detector system located deep underground. This configuration sets up DUNE as a machine for discovery, as it enables opportunities not only to perform precision neutrino measurements that may uncover deviations from the present three-flavor mixing paradigm, but also to discover new particles and unveil new interactions and symmetries beyond those predicted in the Standard Model (SM). Of the many potential beyond…

Error analysis and calibration for a novel pipe profiling tool

2020

Integrity of industrial pipework is ensured through routine inspection. Internal visual inspection tools are capable of characterising degradation in the form of corrosion, pitting, erosion and cracking. The accuracy of such inspection systems has a direct impact on decisions regarding the remaining lifetime of the asset. By minimising error margins, the asset may be operated with confidence for longer, with less uncertainty. This paper considers a probe system consisting of a laser profiler and camera that produces a textured 3D model of the internals of 2 – 6 inch pipework. The accuracy of the system is defined by the ability to extract laser projections from an image as it travels down t…

Plasma Dynamics Characterization for Improvement of Resonantly Enhanced Harmonics Generation in Indium and Tin Laser-Produced Plasmas

2022

R.A.G. is grateful to H. Kuroda for providing the access to the laser facility. As a Center of Excellence, the Institute of Solid State Physics at the University of Latvia received funding from the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement no. 739508, project CAMART².

Recent progress on the superconducting ion source VENUS.

2012

The 28 GHz Ion Source VENUS (versatile ECR for nuclear science) is back in operation after the superconducting sextupole leads were repaired and a fourth cryocooler was added. VENUS serves as an R&D device to explore the limits of electron cyclotron resonance source performance at 28 GHz with its 10 kW gryotron and optimum magnetic fields and as an ion source to increase the capabilities of the 88-Inch Cyclotron both for nuclear physics research and applications. The development and testing of ovens and sputtering techniques cover a wide range of applications. Recent experiments on bismuth demonstrated stable operation at 300 eμA of Bi31+, which is in the intensity range of interest for hig…

The relationship between visible light emission and species fraction of the hydrogen ion beams extracted from 2.45 GHz microwave discharge.

2015

The relationship between Balmer-α and Fulcher-band emissions with extracted H + , H + 2 , and H + 3 ions is demonstrated for a 2.45 GHz microwave discharge. Ion mass spectra and optical measurements of Balmer-α and Fulcher-band emissions have been obtained with a Wien Filter having an optical viewport on the plasma chamber axis. The beam of approximately 1 mA is analyzed for different plasma conditions simultaneously with the measurement of light emissions both with temporal resolution. The use of visible light emissions as a valuable diagnostic tool for monitoring the species fraction of the extracted beams is proposed. peerReviewed

Photoelectron emission experiments with ECR-driven multi-dipolar negative ion plasma source

2017

Photoelectron emission measurements have been performed using a 2.45 GHz ECR-driven multi-dipolar plasma source in a low pressure hydrogen discharge. Photoelectron currents induced by light emitted from ECR zone and H− production region are measured from Al, Cu, Mo, Ta, and stainless steel (SAE 304) surfaces as a function of microwave power and neutral hydrogen pressure. The total photoelectron current from the plasma chamber wall is estimated to reach values up to 1 A for 900 W of injected microwave power. It is concluded that the volumetric photon emission rate in wavelength range relevant for photoelectron emission is a few times higher in arc discharge. peerReviewed

Fracture and fatigue of titanium narrow dental implants: New trends in order to improve the mechanical response

2019

Sixty-four fractured commercially pure titanium (cp-Ti) narrow dental implants (NDIs) with similar macrogeometry and connection designs were studied after different implantation times in humans in order to determine their reliability and to evaluate the causes of the fracture. These NDIs were compared with other similar implants, made with alloyed titanium with 15% Zr and with 12% strained titanium. Original implants were tested under static and fatigue conditions, simulating the tri-axial loads in the mouth by means of a Bionix hydraulic test machine. Fractography was studied using field-emission scanning electron microscopy (FSEM). The results showed that cp-Ti NDI exhibits low strength f…

The implementation of new special education legislation in Finland

2014

This article examines the implementation of new special education legislation in Finland among students with significant disabilities. The data consist of a nationwide survey and field observations. In the analysis, a policy implementation framework is utilized as a theoretical lens. The findings suggest that schools and municipalities that had participated in long-term development projects had more capacity and willingness to reform special education practices substantially, suggesting that learning in one policy area can transfer to other domains across multiple levels of national and local governments. The key findings highlight the significance of professional trust as a policy instrum…

Emma Brockes ja Megan Rapinoe, Yksi elämä. Megan Rapinoen tarina

2021

Iespējamie virzītājspēki vēja parku akceptēšanai un sociāli iekļaujošai izmantošanai Latvijā

2020

Lai gan Latvijas rādītāji atjaunojamo energoresursu izmantošanā enerģijas ražošanai ir vieni no labākajiem Eiropas Savienībā (ES), ierindojot Latviju šajā kategorijā trešajā vietā starp ES valstīm, vēja enerģijas devums šajā nopelnā ir nebūtisks, kā arī jaunākie centieni šo situāciju mainīt ir rezultējušies ar aktīvu iedzīvotāju pretestību un vēja parka ieceres noraidījumu no pašvaldības puses. Maģistra darba ietvaros autore ir pētījusi citu valstu labās prakses piemērus vēja enerģijas akceptējamības veicināšanā; WinWind projekta ietvaros ar vēja nozari saistītu ieinteresēto pušu (stakeholder) lokā identificējusi iniciatīvas un rīcības, kas stimulētu kopienas vēja parku izveidi Latvijā; ar …