12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 1 - Small vacuum pump holding hybrid flat on panel (which it is ‘strong enough’ to do) - Since picture.

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Presentation transcript:

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 1 - Small vacuum pump holding hybrid flat on panel (which it is ‘strong enough’ to do) - Since picture was taken have added stronger cooling fan (12cm, 12V, 0.4A) above hybrid. Simple handheld IR temperature measurement tool shows: ~36C at chip - Power supplies CPX200 for hybrid, HSIO (12V) and cooling fans. Test system with Hybrid (1)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 2 Test-Hybrid from Liverpool with 20 chips (‘Chip6 not working’ sticker) One hybrid on panel, panel screwed onto bonding plate. Powered 3.3V DC (actually should be 2.5V, but then don’t get data transmission. Same behaviour with or without LVDS Adaptor board.) Current drawn: A Test system with Hybrid (2)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 3 Hybrid on panel from Liverpool initially didn’t draw any current. Microcope inspection: No wires between hybrid and panel. -> Simon added those using our Hesse wire- bonder. Top image: Power input side. Bottom pads are on hybrid, top side is panel. Wire-boding hybrid to panel Bottom Image: Data-lines (LVDS) side. Bottom pads are on hybrid, top side is panel. Some wire-pads not to be connected. Our connections are correct (Simon send picture to Ashley in Liverpool to verify)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 4 Hybrid power-up: ‘st_nmask’ test -SCTDAQ s/w setup modified to run in ‘Hybrid’ mode (before: Single-Chip testboard mode) Thanks again to Bruce and Peter at RAL. -Running:.x NoBCCSetup.cpp -‘st_nmask’ shows: All 20 chips responding -> Now can start running more serious tests...

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 5 First Hybrid test: ‘StrobeDelay0.4’ Left: Screenshot of ‘ScanData’ histo window of ‘StrobeDelay 0.4’ test (Faulty ‘Chip6’ showing ?) Below: $SCTVAR/ps/ABCNHybrid_F02_ StrobeDelayPlot_ _ ps

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 6 Glue Tests (1) Image: Glass ASICs on hybrid test cured overnight. Top hybrid: Earlier attempt, Middle hybrid: latest attempt. Visible improvement “There is one die (Top, 5th fromright) that is on the limit but it would pass, there is no glue touching the bond pads. In the image there is an example at the top of a previous glass ASIC test that had too much glue that spread onto the bond pads, this makes a good comparison.” Next: One more Glass ASIC test, then use real ASICs.

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 7 Glue Tests (2) … the same image after some Photo Editor treatment … Top hybrid: Earlier gluing attempts, bottom hybrid: latest attempt.

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 8 Back-up Slides

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 9 Single-Chip Testboard (1) -Test mode: “CaptureBurst”. One of ABC-N chip’s ‘self-test’ modes. -Left side of signal pattern: Data header. Right side: area should be very close to full height. Indicating ABC-N internal analogue voltage circuitry is active (this required jumper switch) -Location of entries indicates clocks are ok (HSIO at same frequency as ABC-N chip)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 10 -Histogram: Test mode: ‘st_nmask’: Black triangle means ‘Good’. One triangle per chip. -Scope screenshot: ‘DelayScan’. LEMO output from HSIO (after transformation LVDS->TTL inside Xilinx FPGA, ie ‘by definition nice signals’) Single-Chip Testboard (2)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 11 Top-right: HSIO and Interface Board. Bottom-left: One-hybrid- panel from Liverpool. Flat-ribbon cable carries ‘Clk, Control, Gnd and Dataout’ signals (4 LVDS-pairs) HSIO at Poynting basement Test system with Hybrid (1)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 12 The Hybrid under test (Cooling fan moved away) Left-hand connector: Datalines (8 LVDS channels). Extra power input for LVDS drivers (3.3V, 0.26A) Right-hand connector: Power input 3.3V (drawing A). Serial powering. Test system with Hybrid (3)

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 13 Simon‘s Work in the Clean-Room: Gluing and Curing Gluing: Simon has performed a large number of tests applying glue using mechanical jigs from Liverpool. Problems encountered: Too much or too little glue at each chip, esp glue unequally distributed, in worst case leaking - could touch wire-bonds !. Simon visited Liverpool in July. One crucial problem identified: One jig was slightly bent, now replaced. Procedure needs to be ‘learned’, esp how to swipe over jig to distribute glue (current best results: ‘one chip(-pair) at a time, back and forth once’) Now: Gluing ‘Glass-ASICs’ (same size and similar weight to real ASIC). “Curing (chemistry): From Wikipedia, the free encyclopedia Curing is a term in polymer chemistry and process engineering that refers to the toughening or hardening of a polymer material by cross-linking of polymer chains, brought about by chemical additives, ultraviolet radiation, electron beam or heat.”

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 14 Ideas for improvement of curing procedure With current materials (two vacuum jigs available, which can’t be put next to each other on a panel due to clearance), only two hybrids could have chips to be glued to them at the same time (ie 2 out of the 8 on each module). Then follows a 24h curing period at room temperature under continuous vacuum ! Simon is thinking about how this can be optimised. Method called ‘Soft Cure’, for 2 hours: Glue still ‘soft’ inside (pokeable), but hard enough to support chips (ie not easily movable under sheer force). Helped by ‘lightly’ heating to 30C-40C, using heating plate to be made in our workshop. Ideally could shorten time needed for one module from 4 days (with long waits) to 1 day (with much less waiting). Sheer-testing very useful to quantify curing stage (“epoxy crosslink”) Info from Liverpool: New hybrids are ‘copper balanced’, ie ‘heavier on the sides’, so don’t bend as much. May not even need vacuum during curing.

12 Aug 2013 ATLAS Tracker Upgrade Status Birmingham 15 Next Steps Simon is soon moving to gluing and curing real ASICs – we have a lot of ‘old’ prototypes, ABC-N 250, cut as dies (from Glasgow) Continuing with test system setup for hybrid, esp run more complex tests, called ‘StrobeDelay’ and ‘3PointGain’. Discuss results with experts (at RAL, Liverpool) Probably connect and test one of the hybrids we’ve assembled in B’ham Further production preparations on-going: New power-supply units purchased by the UK groups (remote- controllable: TTI CPX400DP), B’ham will receive one, needs to be integrated into HSIO test system, s/w can then control voltage/current. Simon’s ideas for curing process optimisations under discussion with UK colleagues John and Juergen are offering a Yr4 project on hybrid tests, ie practical part of that project to start January ’14 Next Generation ABC-N chip on its way: ABC-N 130. In Birmingham about end of year ? UK colleagues are designing new testboards, hybrids, s/w interface.