1UCSB Isolated Bad CAC Bonding Bonding Meeting-21/10/03

Isolated Bad-CAC Strip at UCSB• For first 57 modules

produced at UCSB, there was a slight misunderstanding of bonding rules Bonded isolated Bad CAC

channel that were not also marked as a bad IDIEL channel

• 23 of 57 modules had at least one such channel 42 channels total

• Plucking channels would result in a few more Grade B modules Not a large concern

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2UCSB Isolated Bad CAC Bonding Bonding Meeting-21/10/03

Testing Results on Isolated Bad CAC Strips

• All modules have been fully tested with ARCS and LT system Both pulsed and

continuous LED tests taken

• ALL of the 42 strips had regular test results (passed) No problem seen with

these channels

CAC@ 100 Hz measured (in pF) at QTC

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CAC@ 100 Hz

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Yes, that’s negative capacitance!!!