Jul 22 – 26, 2019
Europe/Rome timezone

Irradiation tests of superconducting detectors and comparison with simulations

Jul 25, 2019, 5:45 PM
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia


Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector Development and Physics Poster session


Dr Yuto Minami (High Energy Accelerator Research Organization)


We target to realise a future satellite mission, LiteBIRD, which will observe full sky at the second Sun-Earth Lagrangian point (L2) and measure the polarisation of the Cosmic Microwave Backgrounds (CMB).
We plan to use Transition Edge Sensor (TES) bolometers to measure the polarisation signal.Measurements of past satellite missions at L2 were disturbed by galactic cosmic rays.Therefore, we need to mitigate the effects from galactic cosmic rays to realise our mission.
Our main concern is the following process:
(1) Cosmic rays deposit energy in silicon substrate where bolometers are.
(2) The energy is propagated by phonons in the silicon substrate.
(3) When some phonons enter a bolometer, the bolometer senses it and spurious signal is created.

In this poster, at first, we show our ideas to mitigate the phonon propagation, as well as the set-up of irradiation test to verify the mitigation ideas.
Next, we show the simulated results of some configurations of parameters using a phonon simulator. Following this, we show the results of irradiation tests,
and compare them to the data from phonon simulations. Finally, we discuss our results and conclude.

Student (Ph.D., M.Sc. or B.Sc.) N
Less than 5 years of experience since completion of Ph.D Y

Primary authors

Dr Yuto Minami (High Energy Accelerator Research Organization) Mr Yoshiki Akiba (High Energy Accelerator Research Organization) Dr Aritoki Suzuki (Lawrence Berkeley National Laboratory) Mr Shawn Beckman (University of California, Berkeley) Prof. Adrian Lee (University of California, Berkeley ) Dr Noah Kurninsky (Fermi National Accelerator Laboratory) Mr Kutsuma Hiroki (Tohoku University) Dr Christopher Raum (University of California, Berkeley) Dr Benjamin Westbrook (University of California, Berkeley) Dr Trevor Sasse (University of California Berkeley) Dr Satoru Mima (RIKEN) Prof. Chao-Lin Kuo (Stanford University) Prof. Masashi Hazumi (Highe Energy Accelerator Research Organization) Ms Samantha Stever (Kavli Institute for the Physics and Mathematics of the Universe)

Presentation materials