|
 On
March 28th, 2008, the BTF (Beijing Test Beam Facility) concluded its
last running season of 437hrs and will soon enter into its upgrade
phase. During the last running season six users had carried out their
experiments on BTF and three main detector beam tests had been
accomplished.
1. HXMT ¨C LE Background Particle Beam Test ( Particle Astrophysics
Centre) Hard X-ray Modulation Telescope ( HXMT£©is an all-sky hard X-ray
survey equipment. One of the main components with HXMT is the Low Energy
X-ray Telescope (LE). The aim of the LE beam test was to study the
background effects of high energy particles in cosmic rays. The test
measured the LE energy and time responses with high energy particles (electron,pion
and proton), whose momentum scope was from 300MeV to 1.1Gev.
2. MRPC-Multi-gap Resistive Plate Chamber (Department of Engineering
Physics, Tsinghua University)Multi-gap resistive plate chamber (MRPC)
proved to have good time resolution (less than 100 ps) and high
detection efficiency (higher than 95%), which has been applied to
construct a full barrel time-of-flight (TOF) detector for the STAR
experiment at RHIC. The new MRPC (50KHz/cm2) prototype with a high
counting rate was successfully tested on BTF.
 3.CVD
Diamond Film Detector (Northwest Institute of Nuclear Technology)The
diamond detector is characteristic of radiation-resistance and fast time
response, which will be applied on BEPCII and BESIII to measure the
irradiated flux and dose rate. The performance test of the detector
module was successfully carried out on BTF.
Following the approval of the Chinese Academy of Sciences and that of
the Institute of High Energy Physics, preparations for the BTF upgrade
are now fully under way and it will experience a long shutdown during
the period of 2008-2009. The main upgrade tasks include: improving beam
optics and beam measurement with new BPMs, improving alignment scheme
(by utilizing laser based techniques), shortening the current
spectrometer and adding TPC+GEM¡¯s detector for double particle
identification, rebuilding particle tracking detectors, adding
instrument sproviding real-time measurements for material radiation
damage and radiation biology.
Efforts by all involved in the above tests and experiment are highly
appreciated. |
