Difference between revisions of "Richard's note on RadPhi cables"
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Revision as of 18:03, 17 July 2006
Elliott,
The colors of the cables are not a very useful indicator to me. The
best I can give you without being down there is a total channel count
that you can apply as a "sum rule" to your inventory.
Radphi device |
channel count |
initial delay |
secondary delay |
lead glass wall (LGD) |
620 |
250 ns |
N/A |
barrel scintillators (BSD) |
48 |
80 ns |
170 ns |
forward scintillators (CPV) |
30 |
80 ns |
170 ns |
barrel gamma counters (BGV) |
48 |
80 ns |
170 ns |
upstream scintillators (UPV) |
6 |
80 ns |
170 ns |
The initial delay came off the base (lemo for LGD, bnc for all others)
and ended at the racks. The long ones are mostly S-coiled in the cable
trays, the others are one-length in the same cable tray. At the racks
end the 80 ns cables go into splitters -- don't recall for sure but I
think those were bnc connectors. The long ones ended with lemo
connectors at the racks that fed into the fastbus adc. The 170 ns
cables delay the analog side of the split signals to feed into the
adc. The other side of the split went into a discriminator and then
out on twisted ribbon straight into the tdc. Those ones did not need a
long delay because the tdc operated in common-stop.
Richard Jones