Particle Physics Seminar

Micropattern gaseous detectors (MPGD), Micromegas and GEM are widely used by
many experiments and future projects: COMPASS, CAST, LHC-B, TOTEM, STAR,
NA48, n-TOF, ILC TPC project, T2K TPC, ATLAS SPLC, dEDM. The high radiation resistance
and excellent spatial and time resolution make them an invaluable tool to confront future
detector challenges at the next generation of colliders. Originally developed for the highenergy
physics, MPGD applications have expanded to astrophysics, neutrino physics,
neutron detection and medical imaging.
We will present a detailed review on principle and basic performance of
Micromegas detector. We will point out new developments that are currently under way:
- An industrial way of fabricating the detector in a single process, called bulk
Micromegas allowing to build large, robust and cheap detectors.
- A novel high-precision fabrication technology using etching through copperkapton-
copper, called micro-Bulk, providing the entire Micromegas structure on a single
thin foil.
- High accuracy, TPC read-out detectors, with positive ion suppression capability
permitting to resolve high particle density events. Its use for low-energy, lowbackground
rare event detection will also be discussed.
- A marriage of micro-pixels and MPGD is currently under development provides
single electron detection and unprecedented 3d accuracy.
A particular attention will be devoted on the ability of these detectors to detect low
energy ion recoils which is a must in dark matter search in order to determine the
direction of WIMP wind.
A new type of radiation detector based on a spherical geometry will also be
presented. The detector consists of a large spherical gas volume with a central electrode
forming a radial electric field. A small spherical sensor located at the center is acting as a
proportional amplification structure. It allows high gas gains... For complete abstract: http://www.phy.bnl.gov/~partsem/fy09/giomataris_abstract.pdf