Author:
Lisowska M.,Angelis Y.,Aune S.,Bortfeldt J.,Brunbauer F.,Chatzianagnostou E.,Dehmelt K.,Desforge D.,Fanourakis G.,Floethner K.J.,Gallinaro M.,Garcia F.,Garg P.,Giomataris I.,Gnanvo K.,Gustavsson T.,Iguaz F.J.,Janssens D.,Kallitsopoulou A.,Kovacic M.,Legou P.,Liu J.,Lupberger M.,Malace S.,Maniatis I.,Meng Y.,Muller H.,Oliveri E.,Orlandini G.,Papaevangelou T.,Pomorski M.,Ropelewski L.,Sampsonidis D.,Scharenberg L.,Schneider T.,Scorsone E.,Sohl L.,van Stenis M.,Tsipolitis Y.,Tzamarias S.E.,Utrobicic A.,Veenhof R.,Wang X.,White S.,Zhang Z.,Zhou Y.
Abstract
Abstract
The PICOSEC Micromegas (MM) detector is a precise timing gaseous detector consisting of
a Cherenkov radiator combined with a photocathode and a MM amplifying structure. A 100-channel
PICOSEC MM prototype with 10 × 10 cm2 active area equipped with a Cesium Iodide (CsI)
photocathode demonstrated a time resolution below σ = 18 ps. The objective of this work
is to improve the PICOSEC MM detector robustness aspects, i.e. integration of resistive MM and
carbon-based photocathodes, while maintaining good time resolution. The PICOSEC MM prototypes
have been tested in laboratory conditions and successfully characterised with 150 GeV/c muon
beams at the CERN SPS H4 beam line. The excellent timing performance below σ = 20 ps for
an individual pad obtained with the 10 × 10 cm2 area resistive PICOSEC MM of
20 MΩ/□ showed no significant time resolution degradation as a result of adding a
resistive layer. A single-pad prototype equipped with a 12 nm thick Boron Carbide (B4C)
photocathode presented a time resolution below σ = 35 ps, opening up new possibilities for
detectors with robust photocathodes. The results made the concept more suitable for the
experiments in need of robust detectors with good time resolution.
Subject
Mathematical Physics,Instrumentation