When a computer is surprised and when it is notーMaking computer reliable in space


In Sci-Fi movies, androids are often depicted as having cold and emotionless character. We may have such impression because most of computers rely on digital processing in which everything is flatly divided into "1" or "0", but--would you believe it?--they are easily surprised and often get upset! It is caused by a strike of tiny invisible particles, fragments of exploding stars a.k.a cosmic ray, but the shock is significant. The shock makes a computer chip surprised and lose its memory, control, and even its fundamental ability to boot up. For successful space missions, we must make chips tough. This talk will present our recent findings such as surprising upsets or digital bit flips of magnetic memories, which are believed to be immune to the shock, and our laser-based "workout" equipment developed for the first time in Japan. Also displayed on the screen is the status of the development of JAXA next-generation space-chips.

Place: 2F Conf. room(1236)


The JEM-EUSO program: Study of Ultra-High Energy Cosmic Rays and atmospheric events from Balloon and International Space Station

Marco Casolino

In this colloquium we will discuss the status and perspectives of the JEM-EUSO missions, carried forth by a collaboration of about 300 researchers from 16 countries, to study Ultra-High Energy comic rays, strange quark matter and terrestrial phenomena with balloon- and space-borne detectors.In particular we will discuss the recent EUSO-SPB (Super Pressure Balloon) flight. Launch took place from Wanaka, New Zealand, in April 2017. EUSO-SPB is the second balloon flight (the first one was from Canada in 2014) using Fresnel lens optics (manufactured in Riken) and Multi-Anode Photomultipliers in the focal surface. We will also discuss the MINI-EUSO mission, to be launched on board the International Space Station (ISS) in beginning 2018. MINI-EUSO is a 25cm diameter, Fresnel lens optics using a similar Focal surface to the one of SPB. It will observe the Earth from the UV-transparent window of the Russian Service module. Its main goals are the search of strange quark matter, study of meteors, Transient Luminous Effects occurring in the upper layers of the atmosphere and seach for E>5e20 eV UHECR events. Future work for a second SPB flight and the construction of K-EUSO, the first large area space UHECR observatory will also be addressed.

Place: 2F Conf. room(1236)

Studying the Early Universe with NASA's JWST

Alberto Conti
Northrop Grumman

The James Webb Space Telescope (JWST) is NASA's next orbiting observatory and the scientific successor to the Hubble Space Telescope. JWST is an international collaboration between NASA, the European Space Agency, and the Canadian Space Agency. NASA's Goddard Space Flight Center is managing the overall development effort. Northrop Grumman is NASA's main industrial partner, and the Space Telescope Science Institute will operate JWST after launch.
During my remarks, I will discuss the current state of the telescope development and address the science that JWST is planning on targeting in the areas of galaxy formation and evolution.

Place: Shin-A 2F Conf room A (1257)