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Prototype:
Thanks to their
STAR TOF MRPC R&D/production experiences, Tsinghua Univ. and USTC has
dedicated to R&D Large Area MRPC since 2006 and provided four pieces modules
of before April, 2007. Two of
the prototypes which built at USTC, see Fig 1&2, has been installed into
STAR for RUN 7. It attached to the HV hox outside the iron bars to take
data of Au+Au collisions, after cosmic ray testing at BNL.
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Fig
1: the 1st Long MRPC built at USTC |
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Fig 2 :
the 1st MTD prototype
was fixed-up in the gas tray-box at BNL |
Nearly at the same
time, end of
2007, Tsinghua
University also set out to R&D Large Area MRPC for STAR project. Fig 3
shows the first module built in Miyun Factory, Beijing. It almost has
the same geometry parameters with USTC's, except for gas gap number is
not 5*2 but 6*2.
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Fig
3 :
Tsinghua group
built its first Long MRPC at the Miyun Factory, photo was taken
during the installation. |
In Fig 4, the other two pieces of MRPC prototype
were shipped to BNL and then passed the primary DAQ/signal checking. Among them,
the one built in Tsinghua University has a higher resistance. In the photograph
taken in BNL lab, they were piled up and made into a cosmic muon telescope with
two scintillators.
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Fig
4 :
A cosmic
muon telescope system at BNL lab, the module from USTC is in the
silver tray box (upper) and the one from Tsinghua is in white, two scintillators with PMTs
are also included. |
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