K5-302

Remote Electro-Opto Readout of a K5 Module

Ashley Greenall
04/11/02

K5-302 Outer Module using Liverpool Support Card

A scheme has been developed to check the feasibility of reading out a K5 module using the Opto Route (DORIC/VDC) remotely. The module is configured to be electrically 'remote' from the readout support card, the interconnection is made via a 5m screened Ethernet cable (for the BPM encoded CLK0/COM0 and Link0/Link1 data streams). The input signals for the DORIC have been set so that they are switching at 60uA (low-end), the DORIC is specified to expect input signals whose switching range is 60uA - 600uA (for a Logic 1).

Module mounted in Valencia Cooling Box
Module mounted directly onto cooling block - no insulation layer added.
Agnd connection to box.
No common-mode chokes used.
Select = 0, Optical data route.

Nominal ABCD bias settings (FEShp = 30uA, FEBias = 220uA)
Vdet = 120V, Idet = 0.36uA
Thybrid = 33C

Opto-Results

As a comparison the tests are repeated but this time using the Redundant data route with the readout adjacent to the module (no remote interconnection).

Redundant-Results

Redundant TrimRange
Redundant ResponseCurve
Redundant NoiseOcc.

Conclusions/Observations

A K5 module has been demonstrated to perform well with module configuration and data readout over 5m Ethernet cable.
No Stream_errors or Timeouts occurred during data collection.
Module performance is as shown below, (Red is for the Redundant link for comparison):

Front-end Input noise, Link0 = 1455e (1405e), Link1 = 1485e (1438e); (specification is <1500e)
Gain, Link0 = 56.8mV/fC (56.8mV/fC), link1 = 57.4mV/fC (57.65mV/fC) (specification is 50mV/fC)
Threshold variation (for TrimRange 0) , Link0 = 2.33mV (2.16mV), Link1 = 1.79mV (1.96mV).
Noise Occupancy, Link0 = 8.93x 10^-6(6.19x 10^-6 ), Link1 = 7.52 x 10^-6(5.24x 10^-6 ) (specification, after irradiation is <10^-4)

Comparing the Remote Opto-Readout against the Redundant Readout shows little difference in the specified performance parameters. The Input Noise, Gain and Threshold profiles also show the same structure.