Active Collimator Preamplifier Cabling and Electronics
Here is some info about cabling and power supply needs for the Active Collimator.
First of all, here are the spec sheets for the amplifiers and power supplies (PS)
Two such power supplies will be needed to source the current necessary for 8 amplifiers used. Richard can correct me if I am wrong, but both PS's have been procured and are sitting at UConn.
The amplifiers are powered and configured (by 3 TTL lines) via a male DB9 connector and the PS has a male DB9 connector on its end. For our beam tests so far, it was sufficient to use custom mappable DB9<->RJ45 adapters and pass the needed voltage levels via CAT5 cable. Because we configured all our amplifiers in the same way, we used essentially an RJ45 replicator (simply many RJ45 jacks all ganged together). PS, 3 TTL lines and the client amplifiers were all plugged into this replicator.
This is still appropriate in the Hall for the power (+/-15V), signal ground and power ground, but now we want to configure each amplifier individually. So, essentially we need to bring 3 TTL lines bundled with the common powers and grounds interfaced with a DB9 connector
In summary:
- Amplifier side: DB9 male:
- 3 TTL lines
- 4 DC power lines: +15V, -15V, sig GND, pwr GND
- Power Supply: DB9 male:
- 4 DC power lines: +15V, -15V, sig GND, pwr GND
- TTL driver (from accelerator folks): connector not yet known:
- 3 TTL outputs) x 8
This is all regarding power and configuration. Regarding the signals: cables from Active Collimator to the amplifiers have been procured. As for taking amplified output signals from the cave to the Hall to plug into the accelerator equipment rack.
Please ignore the DB9 pin in the manuals that refers to the amplifier output. We do not want to wire this and intend to read out the amps from the provided BNC connector. We will need 8 BNC->(something, TBD with accel. folks) cables of sufficient length to bring from upstream end of cave to the rack in the Hall.
Note on cable type and length: the amplified analog signals are of order kHz bandwidth and the TTL lines will be switched rarely by hand, so shaping is not an issue.
