1. Electrical QA Markus Friedl (HEPHY Vienna) IPMU, 19 March 2012

2. Readout Chain Overview  Analog APV25 readout is through copper cable to FADCs  Junction box provides LV to front-end 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA2 1748 APV25 chips Front-end hybrids Rad-hard DC/DC converters Analog level translation, data sparsification and hit time reconstruction Unified Belle II DAQ system ~2m copper cable Junction box ~10m copper cable FADC+PROC Unified optical data link (>20m) Finesse Transmitter Board (FTB) COPPER

3. Layer 6 Origami Ladder  5 DSSD sensors (4 rect + 1 slanted), 10 hybrids in total  6 hybrids (=connectors) read out in BW, 4 read out in FW 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA3

4. Testing  Option A: read out one sensor at a time  APVDAQ: Needs 3 VME modules + repeaters One set reads 4 APVs: 2 needed for p-side (6 APVs) with special cable (we can provide it) and one for n-side (4 APVs)  Option B: read out full ladder at once  Reading out full ladder would require 15 APVDAQ sets  Alternative: use subset of final system (“1/20 system”)  Enough to read out full ladder at once 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA4

5. Ladder Test  Option A  APVDAQ – 4 APV input channels  Needs 3 sets to read out one DSSD with special adapter cable 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA5

6. Ladder Test 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA6  Option B  Subset of Belle II SVD  1/20 test system would be sufficient  Requires 9U VME crate

7. Ladder Test 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA7  Option B  Exactly what we have as a prototype system since 2007  Has been used in several beam tests  New system (with junction box instead of repeaters) is now being designed

8. Additional Infrastructure  Test box  Closed box (light tight) with x/y stage and beta source ( 90 Sr)  Can scan all sensors  Fully automatic operation (overnight)  Laser not recommended as it cannot reach strips underneath ribs  Software  To be adapted for tests and scanning 19 March 2012M.Friedl (HEPHY Vienna): Electrical QA8