Update on POLA-01 measurements in Catania

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Presentation transcript:

Update on POLA-01 measurements in Catania 14/02/2019 Chiara Pinto, Francesco Riggi, Paola La Rocca

Outline Summary on POLA-01 – CATA-01 coincidence measurements Possible use of these measurements to monitor civil structures stability MC simulations and optimization of relative position between detectors

Measurements Measure 1 – outside the acceptance interval of CATA-01, in order to detect two independent muons coming from the same shower. About 13 days acquisition time. Measure 2 – inside the acceptance interval of CATA-01, in order to detect also muons passing through both detectors. Detectors geometry select a narrow acceptance cone (POLA-01: 40 cm x 60 cm). About 47 days acquisition time.

CATA-01 → floor -1 POLA-01 → floor 3 POLA-01 floor 3 15 m 5,4 m floor -1 CATA-01 Geometrical disposition of the two detectors in Catania Physics department. 7,6 m CATA-01 POLA-01

Track selection Coincidence window |(Δt + (t-int(t)) ∙ 2500 -1500) – 140| < 600 ns Quality cuts χ2 < 10 -2 ns < ToF < 10 ns Number of satellites POLA-01 ≥ 3 Number of satellites CATA-01 ≥ 3 Number of tracks POLA-01 = 1 Number of tracks CATA-01 = 1 Corrected time difference spectrum Measurements OUTSIDE CATA-01 acceptance cone: 3 days data taking. Measurements INSIDE CATA-01 acceptance cone: 13 days data taking.

Theta distribution < θ > Δ<θ> 31.03° 0.05° POLA-01 outside CATA-01 acceptance POLA-01 inside CATA-01 acceptance On the left panel the background due to independent muons is shown. On the right there is a peak in a selected region of θ, corresponding to muons passing through both detectors, superimposed on the background.

Phi distribution As before, for the φ distribution. < φ > Δ<φ> 216.43° 0.20° POLA-01 outside CATA-01 acceptance POLA-01 inside CATA-01 acceptance As before, for the φ distribution.

Monitoring of civil structures stability IDEA → using a tracking detector (EEE telescope) and an additional detector (e.g. a scintillator) to test the civil structures stability on a long time scale. This tool can monitor small (mm) shifts of parts of the structure over long time periods. → No need of visibility or empty spaces (VS optical systems) Performances of the method depend on the capability of the main tracking detector, geometry and position of the additional detectors , measurement stability, acquisition time, ...

Measurements Four sets of measurements: Reference -> 0 cm First shift -> 20 cm Second shift -> 10 cm Third shift -> 5 cm POLA-01 POLA-01 x [cm] 20 10 5 0

Theta variation per day blue points (20 cm shift) are higher than red points (reference position), and green points (10 cm shift) are in an intermediate position between red and blue points. Extracting θ centroids day by day one can see that in average there is a shift.

< θ > ± Δ<θ> < φ > ± Δ<φ> 20 cm shift x [cm] < θ > ± Δ<θ> < φ > ± Δ<φ> 31.03° ± 0.05° 216.43° ± 0.20° +20 31.45° ± 0.06° 216.23° ± 0.32° POLA-01 inside CATA-01 acceptance POLA-01 inside CATA-01 acceptance

< θ > ± Δ<θ> < φ > ± Δ<φ> x [cm] < θ > ± Δ<θ> < φ > ± Δ<φ> 31.03° ± 0.05° 216.43° ± 0.20° +10 31.36° ± 0.08° 216.15° ± 0.29° 10 cm shift POLA-01 inside CATA-01 acceptance POLA-01 inside CATA-01 acceptance

< θ > ± Δ<θ> < φ > ± Δ<φ> x [cm] < θ > ± Δ<θ> < φ > ± Δ<φ> 31.03° ± 0.05° 216.43° ± 0.20° +5 31.36° ± 0.08° 216.15° ± 0.29° 5 cm shift POLA-01 inside CATA-01 acceptance POLA-01 inside CATA-01 acceptance

Distribution of average direction in space Mean values for θ and φ angles, estimated with a gaussian fit. Estimation of the average direction in space, summing on all the tracks, in 3 configurations (5 cm, 10 cm, 20 cm). Gaussian fit x [cm] < θ > ± Δ<θ> < φ > ± Δ<φ> 31.03° ± 0.05° 216.39° ± 0.16° +5 31.18° ± 0.07° 215.88° ± 0.33° +10 31.36° ± 0.08° 215.98° ± 0.30° +20 31.45° ± 0.06° 215,67° ± 0.20° Relative distance Relative angle shift 20 cm 0.44° 10 cm 0.24° 5 cm 0.31° 5 cm measurement has a very short statistics – just 4 days

Effect of relative position Performances of the method depend on the capability of the main tracking detector, geometry and position of the additional detectors , measurement stability, acquisition time, ... So, we moved POLA-01 in a different position, in order to estimate the effect of the relative position. 2,5 m POLA-01 CATA-01 CATA-01 → floor -1 POLA-01 → floor 3

Closer to the vertical position x [cm] < θ > ± Δ<θ> < φ > ± Δ<φ> vertical 13.32° ± 0.02° 87.14° ± 0.17° POLA-01 inside CATA-01 acceptance POLA-01 inside CATA-01 acceptance

Relative horizontal distance between detectors Relative distance Relative angle shift 20 cm 0.44° 10 cm 0.24° 5 cm 0.31° Statistics Simulations Experimental results Relative horizontal distance between detectors Acquisition time # events 9,3 m ~ 7 ∙ 105 s 757 2,5 m ~ 6 ∙ 105 s 4305 2,5 m Statistics increased of a factor ~ 7, in agreement with MC simulations. 9,3 m

Conclusions and outlook Present sensitivity of the method may be roughly estimated of the order of few cm for a data taking period of 1 week Proper optimization of relative position can increase statistics Monte Carlo simulations in progress to better understand the results and improve operational conditions Paper in preparation