Hall A uses RG-213 cable as an analog delay line. The trigger logic which generates the gate signal requires a finite amount of time. In order to avoid the detector output arriving at the input of the ADC or TDC modules prior to the arrival of the gate signal, a delay is inserted in-line. This RG-213 delay is required to hold the analog pulse for the photomultiplier tubes. Several options are available for forming an analog delay. Hall A selected a coaxial cable. RG-213 was selected based on cost vs. performance evaluation by Hall B.
RG/U Type Cable |
Inner Conductor (Ohms/1000ft) |
Dielectric Material |
DOD | Number/Type of Shielding Braids (Ohms/1000ft) |
O.D. | Weight (lb/ft) |
Nom. Imped. (Ohms) |
Nom. Cap pf/ft |
Max. Operating Voltage (Volts RMS) |
Comments |
---|---|---|---|---|---|---|---|---|---|---|
213 | .0888 2.26 7/.0296 BC 0.75 (1.7) |
PE | .285 7.24 |
1 / 97% BC (1.2) |
.405 10.29 |
0.099 | 50 | 30.8 | 5000 | Use up to 1000 MHz |
8 | .0855 2.17 7/.0285 BC 0.72 |
PE | .285 7.24 |
1/BC | .405 10.29 |
0.106 | 52 | 29.5 | 4000 | Use RG213 |
8A | .0855 2.17 7/.0285 BC 0.72 |
PE | .285 7.24 |
1/BC | .420 10.29 |
0.106 | 52 | 29.5 | 5000 | Use RG213 |