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.
We present performance studies of a full-length prototype for the CASTOR quartz-tungsten sampling calorimeter, installed in the very forward region of the CMS experiment at the LHC. The response ...linearity and energy resolution, the uniformity, as well as the showers’ spatial properties in the prototype have been studied with electrons, pions and muons of various energies. A special study was also carried out for testing the light-output with a 90-degree cut of the quartz plates of the calorimeter. The data were taken during the CASTOR test beam at CERN/SPS in 2007.
Updated physics performance of the ESSnuSB experiment Alekou, A.; Baussan, E.; Blaskovic Kraljevic, N. ...
The European physical journal. C, Particles and fields,
12/2021, Letnik:
81, Številka:
12
Journal Article
Recenzirano
Odprti dostop
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration ...and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of
5
%
for signal and
10
%
for background, we find that there is
10
σ
(
13
σ
)
CP violation discovery sensitivity for the baseline option of 540 km (360 km) at
δ
CP
=
±
90
∘
. The corresponding fraction of
δ
CP
for which CP violation can be discovered at more than
5
σ
is
70
%
. Regarding CP precision measurements, the
1
σ
error associated with
δ
CP
=
0
∘
is around
5
∘
and with
δ
CP
=
-
90
∘
is around
14
∘
(
7
∘
)
for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have
3
σ
sensitivity for 540 km baseline except
δ
CP
=
±
90
∘
and
5
σ
sensitivity for 360 km baseline for all values of
δ
CP
. The octant of
θ
23
can be determined at
3
σ
for the values of:
θ
23
>
51
∘
(
θ
23
<
42
∘
and
θ
23
>
49
∘
) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at
3
σ
are:
40
∘
<
θ
23
<
52
∘
(
42
∘
<
θ
23
<
51
.
5
∘
) and
2.485
×
10
-
3
eV
2
<
Δ
m
31
2
<
2.545
×
10
-
3
eV
2
(
2.49
×
10
-
3
eV
2
<
Δ
m
31
2
<
2.54
×
10
-
3
eV
2
) for the baseline of 540 km (360 km).
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).
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration ...and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of Formula omitted for signal and Formula omitted for background, we find that there is Formula omitted Formula omitted CP violation discovery sensitivity for the baseline option of 540 km (360 km) at Formula omitted. The corresponding fraction of Formula omitted for which CP violation can be discovered at more than Formula omitted is Formula omitted. Regarding CP precision measurements, the Formula omitted error associated with Formula omitted is around Formula omitted and with Formula omitted is around Formula omitted Formula omitted for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have Formula omitted sensitivity for 540 km baseline except Formula omitted and Formula omitted sensitivity for 360 km baseline for all values of Formula omitted. The octant of Formula omitted can be determined at Formula omitted for the values of: Formula omitted ( Formula omitted and Formula omitted) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at Formula omitted are: Formula omitted ( Formula omitted) and Formula omitted eV Formula omitted eV Formula omitted ( Formula omitted eV Formula omitted eV Formula omitted) for the baseline of 540 km (360 km).
Status of the detector design studies for ESSνSB Park, J.; Cederkäll, J.; Christiansen, P. ...
21st International Workshop on Neutrinos from Accelerators, NuFact 2019,Daegu, Korea, Republic of,2019-08-26 - 2019-08-31,
06/2020, Letnik:
369
Conference Proceeding
Recenzirano
Odprti dostop
The European Spallation Source Neutrino Super Beam (ESSνSB) project aims at a discovery of leptonic CP violation with a precise measurement of the CP phase angle. ESSνSB is characterized by an ...intense neutrino beam to be produced at ESS by a 5-MW proton beam, and the placement of the far detector at the second oscillation maximum. The aims of the near detector for ESSνSB are neutrino flux and interaction cross section measurements. For this purpose, designs consisting of a fine-grained tracker and a 1-kiloton water Cherenkov detector are under investigation. On the other hand, the far detector will be a water Cherenkov detector with an estimated fiducial volume of 500 kilotons. The design considerations include an evaluation of the stability of the detector hall and excavation sites in deep underground mines. All of the detector simulations are based on frameworks which involve Geant4. A versatile event display toolkit for visualization and physics outreach activities has been developed.
In this Snowmass 2021 white paper, we summarise the Conceptual Design of the European Spallation Source neutrino Super Beam (ESSvSB) experiment and its synergies with the possible future muon based ...facilities, e.g. a Low Energy nuSTORM and the Muon Collider. The ESSvSB will benefit from the high power, 5 MW, of the European Spallation Source (ESS) LINAC in Lund-Sweden to produce the world most intense neutrino beam, enabling measurements to be made at the second oscillation maximum. Assuming a ten-year exposure, physics simulations show that the CP-invariance violation can be established with a significance of 5 sigma over more than 70% of all values of delta CP and with an error in the measurement of the delta CP angle of less than 8 degree for all values of delta CP. However, several technological and physics challenges must be further studied before achieving a final Technical Design. Measuring at the 2nd oscillation maximum necessitates a very intense neutrino beam with the appropriate energy. For this, the ESS proton beam LINAC, which is designed to produce the world's most intense neutron beam, will need to be upgraded to 10 MW power, 2.5 GeV energy and 28 Hz beam pulse repetition rate. An accumulator ring will be required for the compression of the ESS LINAC beam pulse from 2.86 ms to 1.3 mus. A high power target station facility will be needed to produce a well-focused intense (super) mu-neutrino beam. The physics performance of that neutrino Super Beam in conjunction with a megaton underground Water Cherenkov neutrino far detector installed at a distance of either 360 km or 540 km from the ESS, the baseline, has been evaluated.
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration ...and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of \(5\%\) for signal and \(10\%\) for background, we find that there is \(10\sigma\) \((13\sigma)\) CP violation discovery sensitivity for the baseline option of 540 km (360 km) at \(\delta_{\rm CP} = \pm 90^\circ\). The corresponding fraction of \(\delta_{\rm CP}\) for which CP violation can be discovered at more than \(5 \sigma\) is \(70\%\). Regarding CP precision measurements, the \(1\sigma\) error associated with \(\delta_{\rm CP} = 0^\circ\) is around \(5^\circ\) and with \(\delta_{\rm CP} = -90^\circ\) is around \(14^\circ\) \((7^\circ)\) for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have \(3\sigma\) sensitivity for 540 km baseline except \(\delta_{\rm CP} = \pm 90^\circ\) and \(5\sigma\) sensitivity for 360 km baseline for all values of \(\delta_{\rm CP}\). The octant of \(\theta_{23}\) can be determined at \(3 \sigma\) for the values of: \(\theta_{23} > 51^\circ\) (\(\theta_{23} < 42^\circ\) and \(\theta_{23} > 49^\circ\)) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at \(3 \sigma\) are: \(40^\circ < \theta_{23} < 52^\circ\) (\(42^\circ < \theta_{23} < 51.5^\circ\)) and \(2.485 \times 10^{-3}\) eV\(^2 < \Delta m^2_{31} < 2.545 \times 10^{-3}\) eV\(^2\) (\(2.49 \times 10^{-3}\) eV\(^2 < \Delta m^2_{31} < 2.54 \times 10^{-3}\) eV\(^2\)) for the baseline of 540 km (360 km).
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