Wednesday. IPMU is closed for the next three days, so I'm going to work from home.
UCB SSL Colloquium
Perspectives in observational MeV gamma-ray astronomy
Peter von Ballmoos
* Compton telescopes: use of Compton scattering--that of X-ray or gamma rays inelastically scattering off of electrons (or nucleons), which results in the photons losing energy (Compton shift) and transferring that energy to the electron. Inverse Compton scattering also exists, where the photon can gain energy from a high-energy electron (or nucleon).
Gamma-ray astronomy: study of the most powerful sources and violent events of the universe: particle acceleration, nuclear physics, cosmic explosions, and non-thermal phenomena. The first objective of the talk is to focus on the status of wave- and quantum-optics in the context of space instrumentation. Then the focus will move to the DUAL mission concept: (1) All-sky Compton imager (ASCI) and (2) two optical modules, the Laue-Lens Optic (LLO) and the Coded-mask optic (CMO). The ASCI serves as (1) optimal focal-plan sensor for deep observations with the optical modules, and (2) as a sensitive true all-sky telescope for surveys and monitoring. Optical modules located on the main satellite, and the ASCI is on a deployable structure at a distance of 30m from the main satellite. This configuration permits to maintain the less massive payload at the focal distance, and also reduces the spacecraft-induced detector background; allows all-sky continuous exposure.
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