Speaker
Jerry Va'vra
(SLAC)
Description
Benefiting form from the recent introduction of new fast vacuum-based pho-
ton detectors with a transit time distribution of σ_TTS ∼ 30-150ps, we are
developing novel RICH detector capable of correcting the chromatic error by
timing, attempted the first time ever on such a scale; we are also developing
a novel TOF detector concept. We have built and successfully tested a novel
particle identification detector called Focusing DIRC. The prototype’s concept
is based on the BaBar DIRC with several important improvements: (a) much
faster pixilated photon detectors based on Burle MCP-PMT and Hamamatsu
MaPMT, (b) mirror allowing to make the photon detector smaller and less sen-
sitive to background in future applications, (c) electronics allowing to measure
the single photon resolution to better than σ ∼ 100-200ps, which allows a cor-
rection of the chromatic error. This is the very first time the chromatic error
was corrected by this method. The detector was tested in the SLAC 10GeV
electron test beam. The presented detector concept could be used for the par-
ticle identification at Super B-factory, ILC, Gluex, Panda, etc. While testing
the timing resolution limits of a 64-pixel MCP-PMT with 10 μm MCP holes,
we have achieved a timing resolution of σ ∼ 30ps with single photoelectrons,
and σ ∼ 8-9ps with for a large number of photoelectrons. This is the best re-
sult ever obtained with this type of tube. The results were obtained with the
PiLas laser diode and represent the point resolution response of the tube. We
present a systematic timing resolution study for various timing concepts as a
function of number of photoelectrons and the magnetic field. The presented
TOF detector concept could be used for the particle identification at Super
B-factory endcaps.
Author
Jerry Va'vra
(SLAC)
