This research aims at investigating the bistable characteristics of unsymmetric cross-ply laminates resulting from thermally induced stresses while curing. The bistable characteristics are examined ...with a focus on the change in geometry for a subset of configurations, namely, rectangular, trapezoidal and triangular. To this end, these geometries are systematically investigated leading to a set of non-dimensional parameters establishing the values required for bistable behavior. A new apparatus is designed to measure the magnitude of the force required for snap-through and snap-back. The influence of friction at the supports of the tested panels is minimized by utilizing air cushion for frictionless motion. Predictions from a nonlinear finite element based methodology using the ABAQUS™ code are validated through comparisons with test data.
A composite panel, with a 0/90 unsymmetric layup, exhibits bi-stable anticlastic equilibrium configurations. One way to provide morphing capabilities to such a panel is attained by attaching ...piezoelectric actuators to its surface. In such a design an electric field is applied to the piezoelectric actuators in order to trigger snap-through behavior of the panel/actuator assembly. A simple cantilever beam configuration is discussed to perform actuator assessment. Results are compared to with predictions from Extended Classical Lamination Theory and finite element analysis. Guidelines are proposed to design a morphing unsymmetric panel/actuator assembly. The panel/actuator(s) assembly is manufactured accordingly. Snap-through experiments are conducted and the ABAQUS finite element software is used to predict snap-through behavior. Analysis predictions are in good agreement with test results.
Presently under construction in Lund, Sweden, the European Spallation Source (ESS) will be the world’s brightest neutron source. As such, it has the potential for a particle physics program with a ...unique reach and which is complementary to that available at other facilities. This paper describes proposed particle physics activities for the ESS. These encompass the exploitation of both the neutrons and neutrinos produced at the ESS for high precision (sensitivity) measurements (searches).
The feasibility and very good performance of a kilowatt-level power amplifier in a single-ended architecture, intended for energy systems are demonstrated. The prototype is designed at 352 MHz for ...the ESS LINAC and delivers 1250 W with 71% efficiency in pulsed operation with a duty cycle of 5%, 3.5 ms pulse at 14 Hz repetition.
In this paper, we study scalar mediator induced nonstandard interactions (SNSIs) in the context of the ESSnuSB experiment. In particular, we study the capability of ESSnuSB to put bounds on the SNSI ...parameters and also study the impact of SNSIs in the measurement of the leptonic 𝐶𝑃 phase 𝛿𝐶𝑃. Existence of SNSIs modifies the neutrino mass matrix and this modification can be expressed in terms of three diagonal real parameters (𝜂𝑒𝑒, 𝜂𝜇𝜇, and 𝜂𝜏𝜏) and three off-diagonal complex parameters (𝜂𝑒𝜇, 𝜂𝑒𝜏, and 𝜂𝜇𝜏). Our study shows that the upper bounds on the parameters 𝜂𝜇𝜇 and 𝜂𝜏𝜏 depend upon how Δ𝑚231 is minimized in the theory. However, this is not the case when one tries to measure the impact of SNSIs on 𝛿𝐶𝑃. Further, we show that the 𝐶𝑃 sensitivity of ESSnuSB can be completely lost for certain values of 𝜂𝑒𝑒 and 𝜂𝜇𝜏 for which the appearance channel probability becomes independent of 𝛿𝐶𝑃.
A
bstract
Neutrino oscillation experiments provide a unique window in exploring several new physics scenarios beyond the standard three flavour. One such scenario is quantum decoherence in neutrino ...oscillation which tends to destroy the interference pattern of neutrinos reaching the far detector from the source. In this work, we study the decoherence in neutrino oscillation in the context of the ESSnuSB experiment. We consider the energy-independent decoherence parameter and derive the analytical expressions for P
μe
and P
μμ
probabilities in vacuum. We have computed the capability of ESSnuSB to put bounds on the decoherence parameters namely, Γ
21
and Γ
32
and found that the constraints on Γ
21
are competitive compared to the DUNE bounds and better than the most stringent LBL ones from MINOS/MINOS+. We have also investigated the impact of decoherence on the ESSnuSB measurement of the Dirac CP phase
δ
CP
and concluded that it remains robust in the presence of new physics.
A design study, named
ESS
ν
SB
for European Spallation Source neutrino Super Beam, has been carried out during the years 2018–2022 of how the 5 MW proton linear accelerator of the European Spallation ...Source under construction in Lund, Sweden, can be used to produce the world’s most intense long-baseline neutrino beam. The high beam intensity will allow for measuring the neutrino oscillations near the second oscillation maximum at which the CP violation signal is close to three times higher than at the first maximum, where other experiments measure. This will enable CP violation discovery in the leptonic sector for a wider range of values of the CP violating phase
δ
CP
and, in particular, a higher precision measurement of
δ
CP
. The present Conceptual Design Report describes the results of the design study of the required upgrade of the ESS linac, of the accumulator ring used to compress the linac pulses from 2.86 ms to 1.2 μs, and of the target station, where the 5 MW proton beam is used to produce the intense neutrino beam. It also presents the design of the near detector, which is used to monitor the neutrino beam as well as to measure neutrino cross sections, and of the large underground far detector located 360 km from ESS, where the magnitude of the oscillation appearance of
ν
e
from
ν
μ
is measured. The physics performance of the
ESS
ν
SB
research facility has been evaluated demonstrating that after 10 years of data-taking, leptonic CP violation can be detected with more than 5 standard deviation significance over 70% of the range of values that the CP violation phase angle
δ
CP
can take and that
δ
CP
can be measured with a standard error less than 8° irrespective of the measured value of
δ
CP
. These results demonstrate the uniquely high physics performance of the proposed
ESS
ν
SB
research facility.
A compact single-stage 8-1 Gysel Combiner in planar technology for operation with 352-MHz pulses with peak output power of 10 kW has been designed, manufactured, and tested. The module has 0.2-dB ...insertion loss when operated at nominal power, and the return loss of all ports is 20 dB or better. The module was operated using 3.3-ms pulses at 14-Hz repetition rate without any signs of degradation, thermal heating, or arcing. The new design makes use of inclusions of weakly coupled lines in the common point section of the Gysel combiner. It is possible to adjust port imbalances caused by parasitic line coupling in the system for optimum performance at a given frequency by adjusting the coupling.
PDF
