Harvard ATLAS Group

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ASD Production/Testing • Harvard/BU project from design to delivery • 73k chips produced, packaged via MOSIS • Chips tested with custom designed, FPGA-based chip tester at Harvard – 1200 chips/day throughput – Chips bar coded, test results stored in database • 8 discriminators per chip, each with threshold offset – Offset values provide unique “fingerprint” for chip – Dispersion of offsets defines quality • 70% Quality 1, 15% Quality 2 • Completed in 2004 Harvard DoE Site Visit – 21 August 2006 George Brandenburg – Page 14
“Mezzanine” Boards • Harvard/BU responsibility • One readout Mezz board mounted on chamber for each 24 MDT tubes • 6-layer board, split analog/digital power & ground planes • 3 ASD chips plus one AMT (TDC) chip • 18k boards burned-in, tested, entered into database at Harvard • Completed in early 2005 Harvard DoE Site Visit – 21 August 2006 George Brandenburg – Page 15
Page 1 and 2: Harvard ATLAS Group Introduction an
Page 3 and 4: Group Evolution • Muon Chamber bu
Page 5 and 6: Muon Spectrometer • Trigger Syste
Page 7 and 8: How it all works… Harvard DoE Sit
Page 9 and 10: A Finished Chamber… Harvard DoE S
Page 11 and 12: Cosmic Ray Studies • Detailed cos
Page 13: ASD Chip • Mixed analog and digit
Page 17 and 18: Muon Detector Milestones • 24/32

Harvard ATLAS Group

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