Please be patient...
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Gas for DRIII
CCT project
Please be patient...
New HV Scheme
The experience of a broken signal wire in the VD,
that forced CLEO to switch off
about a quarter of all wires in some layers,
prompted us to provide HV to each wire individually.
This was done be removing the decoupling circuits
at the VD end plates,
that were providing HV to a whole section,
and connecting each wire with a HV cable to the outside world.
There we will re-use the PT scheme and PC-boards
to decouple the signal and pre-amplify it.
This is the picture gallery of the old and new hardware.
The new Discriminator Boards
OSU has designed a new discriminator board (IB = Intermediate Board),
which will not only give us the TDC signal,
but also a trigger signal for each wire,
if this is needed in further improvements of CESR's luminosity.
Here
is the detailed description of the boards,
its specs, and the tests
we did.
The new TDC's for the VD
Anticipating a further decrease of efficiency in
the inner layers of the VD
because of increasing occupancy,
the new LeCroy mulit-hit TDC 1877
will be installed.
We already have all 11 TDC's we need
and have calibrated them.
We also used them in the
test of the IB.
This hardware was installed August 1996
into CLEO and is now taking data.
The first data run with the multi-hit electronic read out
gave this first Bhaba event
We zoomed in on the VD hits:
Black (larger) circles are west end hits taken with
the original electronics,
red (smaller) circles are east end hits taken with
the new electronics.
How the raw data looks like for one of the tracks.
The FASTBUS readout controller (FRC)
was built by FNAL and its programming
and connection to the existing
DAQ
is part of the project, too.
Current timing data:
See the
FRC programming project
and the
FRC/DAQ hardware project (FLIF)
to learn more about it.
All projects
Gas for DRIII
CCT project