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Cavity shape optimization for a superconducting linear collider
https://cds.cern.ch/record/2108982
Haëbel, EMosnier, ASekutowicz, JSat, 28 Nov 2015 05:01:10 GMT1992https://cds.cern.ch/record/2108982['']Superconducting cavities
https://cds.cern.ch/record/2108981
Weingarten, WSat, 28 Nov 2015 05:01:08 GMT1992https://cds.cern.ch/record/2108981['']Evidence for Torque Caused by a Magnetic Impulse on a Nonmagnetic Torsion Pendulum
https://cds.cern.ch/record/2108274
I have performed an experiment which is a variant of the one suggested recently by F. O. Minotti and T. E. Raptis. The aim of this experiment is to check the generation of a pulsed gravitational potential by a transient magnetic field as predicted by a scalar tensor theory of gravity. Such a scalar tensor theory allows an enhanced coupling of its fundamental long-range real scalar field as well as its external scalar field to the electromagnetic field, according to the author's previous papers. Several possible sources that could mimic the predicted effect have been ruled out. Finally, it seems likely that the predicted effect is there with the right order of magnitude, as expected.Mbelek, Jean PaulThu, 26 Nov 2015 06:40:36 GMT31 Oct 2015arXiv:1511.08151https://cds.cern.ch/record/2108274['arXiv:1511.08151']arXiv:1511.08151Time-dependent Bragg diffraction bymultilayer gratings
https://cds.cern.ch/record/2108266
The time-dependent Bragg diffraction by multilayer gratings working by reflection or by transmission is investigated. The study is performed by generalizing the time-dependent coupled-wave theory previously developed for one-dimensional photonic crystal [Andr{\'e} J-M and Jonnard P, J. Opt. 17, 085609 (2015)] and also by extending the Takagi-Taupin approach of the dynamical theory of diffraction. The indicial response is calculated. It presents a time-delay with a transient time that is a function of the extinction length for reflection geometry and of the extinction length combined with the thickness of the grating for transmission geometry.André, Jean-MichelJonnard, PhilippeThu, 26 Nov 2015 06:40:35 GMT25 Nov 2015arXiv:1511.08094https://cds.cern.ch/record/2108266['arXiv:1511.08094']arXiv:1511.08094Photon plasma--wave interaction via Compton scattering
https://cds.cern.ch/record/2108265
The Kompaneets theory of photon kinetic evolution due to the Compton effect in the absence of absorption and emission is extended to the case of the Vlasov plasma wave oscillations. Under the assumption that the electron distribution function at equilibrium is perturbed by a solution of the linearised Vlasov equation in the long-wavelength limit, a solution of the Kompaneets kinetic equation for the photon distribution function is found and discussed.Erochenkova, GChandre, CristelThu, 26 Nov 2015 06:40:35 GMT25 Nov 2015arXiv:1511.08091https://cds.cern.ch/record/2108265['arXiv:1511.08091']arXiv:1511.08091Three-dimensional magnetic cloak working from DC to 250 kHz
https://cds.cern.ch/record/2108259
Invisible cloaking is one of major outcomes of the metamaterial research, but the practical potential, in particular for high frequencies (e.g., microwave to visible light), is fatally challenged by the complex material properties they usually demand. On the other hand, it will be advantageous and also technologically instrumental to design cloaking devices for applications at low frequencies where electromagnetic components are favorably uncoupled. In this work, we vastly develop the bilayer approach to create a three-dimensional magnetic cloak able to work in both static and dynamic fields. Under the quasi-static approximation, we demonstrate a perfect magnetic cloaking device with a large frequency band from zero to 250 kHz. The practical potential of our device is experimentally verified by using a commercial metal detector, which may lead us to having a real cloaking application where the dynamic magnetic field can be manipulated in desired ways.Zhu, JianfeiJiang, WeiLiu, YichaoYin, GeYuan, JunHe, SailingMa, YunguiThu, 26 Nov 2015 06:40:34 GMT25 Nov 2015arXiv:1511.08005https://cds.cern.ch/record/2108259['arXiv:1511.08005']arXiv:1511.08005Theoretical description of the efficiency enhancement in DSSC sensitized by newly synthesized heteroleptic Ru complexes
https://cds.cern.ch/record/2108258
Recently, some new series of heteroleptic ruthenium-based dyes, the so-called RD dyes, were designed and synthesized showing better performances compared to the well-known homoleptic N719. In this work, using the density-functional theory and its time-dependent extension, we have investigated the electronic structure and absorption spectra of these newly synthesized dyes, and compared the results to those of N3 dye to describe the variations of the properties due to the molecular engineering of ancillary ligand. We have shown that the calculation results of the absorption spectra for these dyes using the PBE0 for the exchange-correlation functional are in a better agreement with the experiment than using B3LYP or range-separated CAM-B3LYP. We have also derived a formula based on the DFT and used it to visually describe the level shifts in a solvent. The higher $J_{sc}$ observed in these new dyes is explained by the fact that here, in contrast to N3, the excitation charge was effectively transferred to the anchoring ligand. Furthermore, we have shown that the difference dipole moment vectors of the ground and excited states can be used to determine the charge-transfer direction in an excitation process. Finally, the different electron lifetimes observed in these dyes is explained by investigating the adsorption geometries and the relative orientations of iodine molecules in different ``dye$\cdots$I$_2$'' complexes.Azar, Yavar TPayami, MahmoudThu, 26 Nov 2015 06:40:34 GMT25 Nov 2015arXiv:1511.07995https://cds.cern.ch/record/2108258['arXiv:1511.07995']arXiv:1511.07995Counterintuitive issues in the charge transport through molecular junctions
https://cds.cern.ch/record/2108250
Whether at phenomenological or microscopic levels, most theoretical approaches to charge transport through molecular junctions postulate or attempt to justify microscopically the existence of a dominant molecular orbital (MO). Within such single level descriptions, experimental current-voltage I-V curves are sometimes/often analyzed by using analytical formulas expressing the current as a cubic expansion in terms of the applied voltage V, and relate possible V-driven shifts of the level energy offset relative to the metallic Fermi energy \varepsilon_{0} to an asymmetry of molecule-electrode couplings or to an asymmetric location of the "center of gravity" of the MO with respect to electrodes. In this paper, we present results demonstrating the failure of these intuitive expectations. For example, we show how typical data processing based on cubic expansions yields a value of \varepsilon_0 underestimated by a typical factor of about two. When compared to theoretical results of DFT approaches, which typically underestimate the HOMO-LUMO gap by a similar factor, this may create the false impression of "agreement" with experiments in situations where this is actually not the case. Further, such cubic expansions yield model parameter values dependent on the bias range width employed for fitting, which is unacceptable physically. Finally, we present an example demonstrating that, counter-intuitively, the bias-induced change in the energy of an MO located much closer to an electrode can occur in a direction that is opposite to the change in the Fermi energy of that electrode. This is contrary to what one expects based on a "lever rule" argument, according to which the MO "feels" the local value of the electric potential, which is assumed to vary linearly across the junction and is closer to the potential of the closer electrode.Baldea, IoanThu, 26 Nov 2015 06:40:34 GMT24 Nov 2015arXiv:1511.07905https://cds.cern.ch/record/2108250['arXiv:1511.07905']arXiv:1511.07905Dimensional Equations of Entropy
https://cds.cern.ch/record/2108243
Entropy is a quantity which is of great importance in physics and chemistry. The concept comes out of thermodynamics, proposed by Rudolf Clausius in his analysis of Carnot cycle and linked by Ludwig Boltzmann to the number of specific ways in which a physical system may be arranged. Any physics classroom, in its task of learning physics, has therefore to face this crucial concept. As we will show in this paper, the lectures can be enriched by discussing dimensional equations linked to the entropy of some physical systems.Sparavigna, Amelia CarolinaThu, 26 Nov 2015 06:40:33 GMT22 Nov 2015arXiv:1511.07822https://cds.cern.ch/record/2108243['arXiv:1511.07822']arXiv:1511.07822Modeling of the substrate influence on multielement THz detector operation
https://cds.cern.ch/record/2108241
The development of THz multielement uncooled imagers based on focal plane arrays (FPAs) requires an optimization of the system parameters to achieve a homogeneous sensitivity of the array elements. Results of numerical simulation of the eight-element linear array of planar antennas with detecting elements, on a substrate of finite dimensions are presented. We establish how the substrate thickness h and the relative permittivity epsilon influence antenna pattern and antenna-detector matching for each element. We show that the antenna pattern depends on the detector position more than the antenna-detector impedance matching. The gain of array elements, the antenna-detector matching, and the homogeneity of the detector sensitivity can be simultaneously optimized by the proper choice of the substrate thickness h and the relative permittivity epsilon. We show that multielement systems with large substrate thickness and high relative permittivity are not suitable for the imaging system implementation. To achieve uniform multielement system sensitivity, substrates with low permittivity (epsilon < 5) and/or low thickness (h < 60 mkm for the Si substrate) should be used. Finally, we investigate the operation of the detector array with optimally chosen substrate parameters together with the focusing lens, and show that the system is able to work as FPA without significant image corruption.Sakhno, MGumenjuk-Sichevska, JSizov, FThu, 26 Nov 2015 06:40:33 GMT24 Nov 2015arXiv:1511.07807https://cds.cern.ch/record/2108241['arXiv:1511.07807']arXiv:1511.07807A Historical Discussion of Angular Momentum and its Euler Equation
https://cds.cern.ch/record/2108229
We propose a discussion of angular momentum and its Euler equation, with the aim of giving a short outline of their history. This outline can be useful for teaching purposes too, to amend some problems that students can have in learning this important physical quantity.Sparavigna, Amelia CarolinaThu, 26 Nov 2015 06:40:31 GMT23 Nov 2015arXiv:1511.07748https://cds.cern.ch/record/2108229['arXiv:1511.07748']arXiv:1511.07748Modeling of electron energy spectra and mobilities in semi-metallic Hg1-xCdxTe quantum wells
https://cds.cern.ch/record/2108228
Electron mobility, energy spectra and intrinsic carrier concentrations in the n-type Hg0.32Cd0.68Te / Hg1-xCdxTe / Hg0.32Cd0.68Te quantum well (QW) in semi-metallic state are numerically modeled. Energy spectra and wave functions were calculated in the framework of the 8-band k-p Hamiltonian. In our model, electron scattering on longitudinal optical phonons, charged impurities, and holes has been taken into account, and the mobility has been calculated by an iterative solution of the Boltzmann transport equation. Our results show that the increase of the electron concentration in the well enhances the screening of the 2D electron gas, decreases the hole concentration, and can ultimately lead to a high electron mobility at liquid nitrogen temperatures. The increase of the electron concentration in the QW could be achieved in situ by delta-doping of barriers or by applying the top-gate potential. Our modeling has shown that for low molar composition x the concentration of holes in the well is high in a wide range of electron concentrations; in this case, the purity of samples does not significantly influence the electron mobility. These results are important in the context of establishing optimal parameters for the fabrication of high-mobility Hg1-xCdxTe quantum wells able to operate at liquid nitrogen temperature and thus suitable for applications in terahertz detectors.Melezhik, E OGumenjuk-Sichevska, J VSizov, F FThu, 26 Nov 2015 06:40:31 GMT24 Nov 2015arXiv:1511.07745https://cds.cern.ch/record/2108228['arXiv:1511.07745']arXiv:1511.07745Spatial social dilemmas: dilution, mobility and grouping effects with imitation dynamics
https://cds.cern.ch/record/2108227
We present an extensive, systematic study of the Prisoner's Dilemma and Snowdrift games on a square lattice under a synchronous, noiseless imitation dynamics. We show that for both the occupancy of the network and the (random) mobility of the agents there are intermediate values that may increase the amount of cooperators in the system and new phases appear. We analytically determine the transition lines between these phases and compare with the mean field prediction and the observed behavior on a square lattice. We point out which are the more relevant microscopic processes that entitle cooperators to invade a population of defectors in the presence of mobility and discuss the universality of these results.Vainstein, Mendeli HArenzon, Jeferson JThu, 26 Nov 2015 06:40:30 GMT24 Nov 2015arXiv:1511.07740https://cds.cern.ch/record/2108227['arXiv:1511.07740']arXiv:1511.07740Impacts of suppressing guide on information spreading
https://cds.cern.ch/record/2108207
It is quite common that guides are introduced to suppress the information spreading in modern society for different purposes. In this paper, an agent-based model is established to quantitatively analyze the impacts of suppressing guides on information spreading. We find that the spreading threshold depends on the attractiveness of the information and the topology of the social network with no suppressing guides at all. Usually, one would expect that the existence of suppressing guides in the spreading procedure may result in less diffusion of information within the overall network. However, we find that sometimes the opposite is true: the manipulating nodes of suppressing guides may lead to more extensive information spreading when there are audiences with the reversal mind. These results can provide valuable theoretical references to public opinion guidance on various information, e.g., rumor or news spreading.Xu, JinghongZhang, LinMa, BaojunWu, YeThu, 26 Nov 2015 06:40:27 GMT23 Nov 2015arXiv:1511.07544https://cds.cern.ch/record/2108207['arXiv:1511.07544']arXiv:1511.07544Weyl spinors and the helicity formalism
https://cds.cern.ch/record/2108200
In this work we give a review of the original formulation of the relativistic wave equation for particles with spin one-half. Traditionally \`a la Dirac, it's proposed that the ``square root'' of the Klein-Gordon (K-G) equation involves a 4 component (Dirac) spinor and in the non-relativistic limit it can be written as 2 equations for two 2 component spinors. On the other hand, there exists Weyl's formalism, in which one works from the beginning with 2 component Weyl spinors, which are the fundamental objects of the helicity formalism. In this work we rederive Weyl's equations directly, starting from K-G equation. We also obtain the electromagnetic interaction through minimal coupling and we get the interaction with the magnetic moment. As an example of the use of that formalism, we calculate Compton scattering using the helicity methods.Diaz-Cruz, J LorenzoLopez, Bryan LariosMeza-Aldama, OPerez, Jonathan ReyesThu, 26 Nov 2015 06:40:27 GMT19 Nov 2015arXiv:1511.07477https://cds.cern.ch/record/2108200['arXiv:1511.07477']arXiv:1511.07477Further evidence for a dynamically generated secondary bow in $^{13}$C+$^{12}$C rainbow scattering
https://cds.cern.ch/record/2108190
The existence of a secondary bow is confirmed for 13C+12C nuclear rainbow scattering in addition to the 16O+12C system. This is found by studying the experimental angular distribution of 13C+12C scattering at the incident 13C energy $E_L$=250 MeV with an extended double folding (EDF) model that describes all the diagonal and off-diagonal coupling potentials derived from the microscopic wave functions for 12C using a density-dependent nucleon-nucleon force. The Airy minimum at \theta$ $\approx$70$^\circ$, which is not reproduced by a conventional folding potential, is revealed to be a secondary bow generated dynamically by a coupling to the excited state 2+ (4.44 MeV) of 12C. The essential importance of the quadruple {\it Y2} term (reorientation term) of potential of the excited state 2+ of 12C for the emergence of a secondary bow is found. The mechanism of the secondary bow is intuitively explained by showing how the trajectories are refracted dynamically into the classically forbidden angular region beyond the rainbow angle of the primary rainbow.Ohkubo, SHirabayashi, YOgloblin, A AThu, 26 Nov 2015 06:40:01 GMT24 Nov 2015arXiv:1511.07939https://cds.cern.ch/record/2108190['arXiv:1511.07939']arXiv:1511.07939BSM effects on the Higgs transverse-momentum spectrum in an EFT approach
https://cds.cern.ch/record/2108159
Effective Field Theories offer a consistent bottom-up approach to parametrise small deviations from Standard Model predictions. In this work we report on the application of the Effective Field Theory to shed light on effects from high-scale physics beyond the Standard Model on the Higgs transverse-momentum spectrum. The Standard Model prediction for the transverse-momentum distribution in Higgs boson production through gluon fusion is augmented by three new dimension-six operators, implying the modification of the top and bottom Yukawa couplings, and the inclusion of a point-like Higgs-gluon coupling. We present resummed transverse-momentum spectra including these operators at NLO+NLL accuracy and study their effects on the shape of the distribution. The proper parametrization of such effects becomes increasingly important for experimental analyses in Run II of the LHC.Grazzini, MassimilianoIlnicka, AgnieszkaSpira, MichaelWiesemann, MariusThu, 26 Nov 2015 06:38:43 GMT25 Nov 2015arXiv:1511.08059https://cds.cern.ch/record/2108159['arXiv:1511.08059']arXiv:1511.08059Complex Masses of Resonances in the Potential Approach
https://cds.cern.ch/record/2108153
Quarkonium resonances in the complex-mass scale are studied. Relativistic quark potential model is used to describe the quark-antiquark system. The complex-mass formula is obtained from two exact asymptotic solutions for the QCD motivated potential with the distance-dependent value of the strong coupling in QCD. The centered masses and total widths of some meson resonances are calculated. A possible origin of the ``dark matter'' and the ``Missing Mass''is discussed.Sergeenko, M NThu, 26 Nov 2015 06:38:42 GMT24 Nov 2015arXiv:1511.07816https://cds.cern.ch/record/2108153['arXiv:1511.07816']arXiv:1511.07816A Dynamical System Analysis of Holographic Dark Energy Models with Different IR Cutoff
https://cds.cern.ch/record/2108117
The paper deals with a dynamical system analysis of the cosmological evolution of an holographic dark energy (HDE) model interacting with dark matter (DM) which is chosen in the form of dust. The infrared cut-off of the holographic model is chosen as future event horizon or Ricci length scale. The interaction term between dark energy and dark matter is chosen of following three types i) proportional to the sum of the energy densities of the two dark components ii) proportional to the product of the matter energy densities and iii) proportional to dark energy density. The dynamical equations are reduced to an autonomous system for the three cases and corresponding phase space is analyzed.Mahata, NilanjanaChakraborty, SubenoyThu, 26 Nov 2015 06:36:34 GMT25 Nov 2015arXiv:1511.07955https://cds.cern.ch/record/2108117['arXiv:1511.07955']arXiv:1511.07955Towards realistic $f(T)$ models with nonminimal torsion-matter coupling extension
https://cds.cern.ch/record/2108116
Using the observation data of SNeIa, CMB and BAO, we establish two concrete $f(T)$ models with nonminimal torsion-matter coupling extension. We study in detail the cosmological implication of our models and find they are successful in describing the observation of the Universe, its large scale structure and evolution. In other words, these models do not change the successful aspects of $\Lambda$CDM scenario under the error band of fitting values as describing the evolution history of the Universe including radiation-dominated era, matter-dominated era and the present accelerating expansion. Meanwhile, the significant advantage of these models is that they could avoid the cosmological constant problem of $\Lambda$CDM. A joint analysis is performed by using the data of CMB+BAO+JLA, which leads to $\Omega_{m0}=0.255\pm 0.010, \Omega_{b0}h^2=0.0221\pm 0.0003$ and $H_0=68.54\pm 1.27$ for model I and $\Omega_{m0}=0.306\pm 0.010, \Omega_{b0}h^2=0.0225\pm 0.0003$ and $H_0=60.97\pm 0.44$ for model II at 1$\sigma$ confidence level. The evolution of the decelaration parameter $q(a)$ and the effective equation of state $w_{DE}(a)$ are displayed. Furthermore, The resulted age of the Universe from our models is consistent with the ages of the oldest globular clusters. As for the fate of the Universe, model I results in a de Sitter accelerating phase while model II appears a power-law one, even though $w_{DE0}< -1$ makes model I look like a phantom at present time.Feng, Chao-junGe, Fei-feiLi, Xin-zhouLin, Rui-huiZhai, Xiang-huaThu, 26 Nov 2015 06:36:34 GMT24 Nov 2015arXiv:1511.07935https://cds.cern.ch/record/2108116['arXiv:1511.07935']arXiv:1511.07935Gravitational Encounters and the Evolution of Galactic Nuclei. IV. Captures Mediated by Gravitational-Wave Energy Loss
https://cds.cern.ch/record/2108090
Direct numerical integrations of the two-dimensional Fokker-Planck equation are carried out for compact objects orbiting a supermassive black hole (SBH) at the center of a galaxy. As in Papers I-III, the diffusion coefficients incorporate the effects of the lowest-order post-Newtonian corrections to the equations of motion. In addition, terms describing the loss of orbital energy and angular momentum due to the 5/2-order post-Newtonian terms are included. In the steady state, captures are found to occur in two regimes that are clearly differentiated in terms of energy, or semimajor axis; these two regimes are naturally characterized as "plunges" (low binding energy) and "EMRIs," or extreme-mass-ratio inspirals (high binding energy). The capture rate, and the distribution of orbital elements of the captured objects, are presented for two steady-state models based on the Milky Way: one with a relatively high density of remnants and one with a lower density. In both models, but particularly in the second, the steady-state energy distribution and the distribution of orbital elements of the captured objects are substantially different than if the Bahcall-Wolf energy distribution were assumed. The ability of classical relaxation to soften the blocking effects of the Schwarzschild barrier is quantified.These results, together with those of Papers I-III, suggest that a Fokker-Planck description can adequately represent the dynamics of collisional loss cones in the relativistic regime.Merritt, DavidThu, 26 Nov 2015 06:34:54 GMT25 Nov 2015arXiv:1511.08169https://cds.cern.ch/record/2108090['arXiv:1511.08169']arXiv:1511.08169The ICRF-3: Status, plans, and progress on the next generation International Celestial Reference Frame
https://cds.cern.ch/record/2108082
The goal of this presentation is to report the latest progress in creation of the next generation of VLBI-based International Celestial Reference Frame, ICRF3. Two main directions of ICRF3 development are improvement of the S/X-band frame and extension of the ICRF to higher frequencies. Another important task of this work is the preparation for comparison of ICRF3 with the new generation optical frame GCRF expected by the end of the decade as a result of the Gaia mission.Malkin, ZJacobs, C SArias, FBoboltz, DBoehm, JBolotin, SBourda, GCharlot, PDe Witt, AFey, AGaume, RHeinkelmann, RLambert, SMa, CNothnagel, ASeitz, MGordon, DSkurikhina, ESouchay, JTitov, OThu, 26 Nov 2015 06:34:52 GMT25 Nov 2015arXiv:1511.08035https://cds.cern.ch/record/2108082['arXiv:1511.08035']arXiv:1511.08035Periodic Motion near the Surface of Asteroids
https://cds.cern.ch/record/2108069
We are interested in the periodic motion and bifurcations near the surface of an asteroid. The gravity field of an irregular asteroid and the equation of motion of a particle near the surface of an asteroid are studied. The periodic motions around the major body of triple asteroid 216 Kleopatra and the OSIRIS REx mission target asteroid 101955 Bennu are discussed. We find that motion near the surface of an irregular asteroid is quite different from the motion near the surface of a homoplastically spheroidal celestial body. The periodic motions around the asteroid 101955 Bennu and 216 Kleopatra indicate that the geometrical shapes of the orbits are probably very sophisticated. There exist both stable periodic motions and unstable periodic motions near the surface of the same irregular asteroid. This periodic motion which is unstable can be resonant or non resonant. The period doubling bifurcation and pseudo period doubling bifurcation of periodic orbits coexist in the same gravity field of the primary of the triple asteroid 216 Kleopatra. It is found that both of the period doubling bifurcations of periodic orbits and pseudo period-doubling bifurcation of periodic orbits have four different paths. The pseudo period doubling bifurcation found in the potential field of primary of triple asteroid 216 Kleopatra shows that there exist stable periodic orbits near the primary s equatorial plane, which gives an explanation for the motion stability of the triple asteroid 216 Kleopatra s two moonlets, Alexhelios and Cleoselene.Jiang, YuBaoyin, HexiLi, HengnianThu, 26 Nov 2015 06:34:49 GMT24 Nov 2015arXiv:1511.07926https://cds.cern.ch/record/2108069['arXiv:1511.07926']arXiv:1511.07926KIC 8462852 - The Infrared Flux
https://cds.cern.ch/record/2108067
We analyzed the warm Spitzer/IRAC data of KIC 8462852. We found no evidence of infrared excess at 3.6 micron and a small excess of 0.43 +/- 0.18 mJy at 4.5 micron, below the 3 sigma threshold necessary to claim a detection. The lack of strong infrared excess 2 years after the events responsible for the unusual light curve observed by Kepler, further disfavors the scenarios involving a catastrophic collision in a KIC 8462852 asteroid belt, a giant impact disrupting a planet in the system or a population of a dust-enshrouded planetesimals. The scenario invoking the fragmentation of a family of comets on a highly elliptical orbit is instead consistent with the lack of strong infrared excess found by our analysis.Marengo, MassimoHulsebus, AlanWillis, SarahThu, 26 Nov 2015 06:34:49 GMT24 Nov 2015arXiv:1511.07908https://cds.cern.ch/record/2108067['arXiv:1511.07908']arXiv:1511.07908Attenuation measurements of vacuum ultraviolet light in liquid argon revisited
https://cds.cern.ch/record/2108037
The attenuation of vacuum ultraviolet light in liquid argon in the context of its application in large liquid noble gas detectors has been studied. Compared to a previous publication several technical issues concerning transmission measurements in general are addressed and several systematic effects were quantitatively measured. Wavelength-resolved transmission measurements have been performed from the vacuum ultraviolet to the near-infrared region. On the current level of sensitivity with a length of the optical path of 11.6 cm, no xenon-related absorption effects could be observed, and pure liquid argon is fully transparent down to the short wavelength cut-off of the experimental setup at 118 nm. A lower limit for the attenuation length of pure liquid argon for its own scintillation light has been estimated to be 1.10 m based on a very conservative approach.Neumeier, ADandl, THimpsl, AHofmann, MOberauer, LPotzel, WSchönert, SUlrich, AThu, 26 Nov 2015 06:34:40 GMT24 Nov 2015arXiv:1511.07726https://cds.cern.ch/record/2108037['arXiv:1511.07726']arXiv:1511.07726