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Acceptance test at Duke

Acceptance test at Duke. After completion of stringing (still in the stringing station) HV testing of each straw at 1700 volts in air No arcing Current <10 m A About 5-10% wires fail Replace them. Tension measurement. Acceptance criteria 128 Hz < Tension < 170 Hz

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Acceptance test at Duke

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  1. Acceptance test at Duke

  2. After completion of stringing (still in the stringing station) • HV testing of each straw at 1700 volts in air • No arcing • Current <10 mA • About 5-10% wires fail • Replace them. • Tension measurement. Acceptance criteria • 128 Hz < Tension < 170 Hz • Tfront – Tback < 3 Hz • About ~1% wires fail the test • Replace them • Seal the tension plate and purging volume • Straw volume <1 mb/bar/min • Purging volume < 10 mb/bar/min

  3. Front/back tension

  4. Leak Rate –straw volume

  5. Signal Test • Use X-ray scanner • Ar-CO2(70-30) but no CO2 in the purging volume • Current is recorded at 1600 Volts. • No attempt to reduce the current below ~100 nA but the current draw is typically less than a few hundred nA after fixing noisy channels. • Wires with HV problem are removed and re-strung if necessary. Usually there are one or two wires per module with the problem. • No problem for a few days • ADC spectrum is recorded from the front and back. • Check the signal shape and counting rate. • Reverse voltage is applied to the noisy straws • There are a couple of channels per module fail the signal test. These wires are removed and re-strung if necessary. • Bad wire-joint: front and back are connected • No signal: a wire is not connected to a socket • Very noisy channel

  6. Signal test output

  7. When modules leave Duke, no more than 1% of straws are dead. The passport has a list of bad wires with reasons for failure. ~1/2 of the wires can be saved with re-stringing. • Dimension check • Use the fixture from IU to make sure module dimensions are within the specification. • Ready for gain mapping.

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