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T: Fachverband Teilchenphysik
T 22: Detektorsysteme 1
T 22.2: Talk
Monday, March 24, 2014, 11:20–11:35, GFH 01-721
The ALPS-II Experiment in Hamburg; The current state — Reza Hodajerdi and •Friederike Januschek for the ALPS-II collaboration — Deutsches Elektronen-Synchrotron, Hamburg, Germany
A few years ago the ALPS-I (Any Light Particle Search) experiment in Hamburg with its light-shining-through-the-wall (LSW) set up has given the best constraints of purely laboratory based experiments on the axion-like-particle to photon coupling gaγ ≤ 7 × 10−8 GeV−1, ma ≤ 10−4 eV so far. To increase the sensitivity for axion-like particles and other weakly interacting slim particles (WISPs), a second experiment (ALPS-II, Hamburg) has been designed to reach a value of ga γ ≈ 2 × 10−11 GeV−1. To probe the new parameter space, ALPS-II will be improved in all three essential experimental scopes for a LSW experiment. In the ALPS-II setup, a new type of detector has been applied; the transition-edge-sensor as a single photon detector. By straightening the magnets of the HERA it is possible to provide a magnetic field of about 5 Tesla for the whole 200 m long setup. Furthermore the laser power in ALPS-II will be increased compared to ALPS-I. The ALPS-II production cavity can increase the optical power of the light beam directed towards the wall by a factor of 5000 compared to the power of the injected laser (30 W). Behind the wall, the regeneration cavity increases the probability with which photons are created from the axion-like particle field by a factor of 40000. Altogether the improvements lead to a three orders of magnitude more sensitive setup than ALPS-I.