1. The group is developing readout electronics for initial use with the prototype test-stand at Fermilab. This work will contribute towards the design and cost-estimate for a full-scale NLC muon detector readout. Readout Electronics Development for the NLC Muon Detector Mani Tripathi Britt Holbrook (Engineer) Juan Lizarazo (Physics student) Yash Bansal (EE student)

2. Issues to be Addressed Multiplexing several fibers in one PMT channel - besides mux-ing physically distant fibers, time-separation can be achieved by adding clear fiber delays to channels. Noise rate in Multi-anode PMT at 1.5 p.e. threshold - to be determined. Optimum resolution in time-of-arrival determination - 250 ps can be easily achieved. If TOF measurement is a goal, we will need to consider improving the resolution. Optimum resolution in pulse height/photon counting - 6-8 bit digitization with Gsamples/s can be easily achieved. If 12 bits are required for calorimetry, it can be implemented

3. Simplified Schematic +V Voltage Sensing Amp Pre-amp Co-ax cable Variable Splitter High Gain Output Low Gain Output PMT I DC Anode Current Monitoring The Pre-amp is powered by I DC from the Amp which also measures the anode current. The co-ax can be upto 100’ long without much loss in signal. PMT base-board

4. Amplifier Schematic

5. Work in Progress A PC board for housing 16-channel PMT is being developed. Dimensions 4.5” x 4.5”. Dynode resistor chain is built-in. On-board preamplifiers. Preamp gain ~ x10 Preamp bandwidth ~ 1.6 GHz. Post-amplifiers with two outputs have already been developed. The two channels can have different gains for extending resolution in digitization. DAQ for the test-stand will consist of CAMAC TDCs and ADCs. Modules have been borrowed from PREP for this purpose.

6. Amplifier Response OUTPUT INPUT

7. Inexpensive RF amplifiers Manufactured by Mini Circuits. The cost per chip is ~ $1.50 Ideal for remote sensing because d.c. power is supplied on the same co-ax that carries the signal pulse.

8. HV Signal Outputs (total 16) Dynode resistor chain and capacitors Monolithic wide-bandwidth preamplifiers PMT base-board/Preamplifier Layout

9. Summary Amplification system has been developed. Prototypes will be produced this summer. DAQ modules have been acquired for the temporary system for the test-stand. A digitization and acquisition system is being designed.