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Testing at Fermilab

April 14th 2011

Visit by: Osamu (5 days) Koji and Makoto (3 weeks) KEK KIT KATs (permanent transfer)

Goal for this week:

- Power up Module 72 (warm)

- Get IV curves

- Interface to KEK ADC system

- Try to see a signal at Room T

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Quiet 1 Module 72

All LNA’s have individual Gate Control

Summary

All Active Devices on Module 72 appear to be alive at room T

Success: We see the internal noise signal We see signal from Gunn Oscillator

Goal for Next Week:

- Move system to Cryostat

- Do cool down

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KEK 64-channel ADC system

KEK Preamp

Bias Board and MAB and Gunn Diode

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Leg A Drain Current versus Gate Voltage

Drain Voltage for all LNA’s = 250 mV

We did NOT do I-V curve for V-drain = 750 mV(afraid of pushing too much drain current)

LNA1

LNA2

LNA3

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Leg B Drain Current versus Gate Voltage

Drain Voltage for all LNA’s = 250 mV

We did NOT do I-V curve for V-drain = 750 mV(afraid of pushing too much drain current)

LNA1

LNA2

LNA3

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Warm IV curve ofU2 Detector Diode

We found thatthe Detector Diode Polarity in module 72 is OPPOSITE ofwhat we expect.

We adapted by reversingour low voltage lines.

Result shown AFTERreversing voltage lines

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Module is ALIVE: Receiver Noise is seen by KEK ADC system

Phase switch Diode PA1 is turned ON and OFF

Total Power signal x 100seen by KEKADC system

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Toggling Phase Switch Power

All Phase SwitchDiodesare alive

Note: Plotted istotal power seen by KEK ADC x 100

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Inject W-band power (from Gunn oscillator) into module, modulated at 1 Hz

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Inject W-band power (from Gunn oscillator) into module, modulated at 1 Hz

Zoomed in time

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