1. US TileCal Meeting at UTA Possible Electronics Evolution J. Pilcher University of Chicago

2. 5/13/02J. Pilcher2 Digital LVL1 trigger At present analog LVL1 signals are transmitted off-detector and digitized  Susceptible to noise pickup  Limited dynamic range (hard to see muons)  Signals used for triggering are not the same as those sent to LVL2 trigger Most modern experiments try to avoid this  Requires digitization on-detector  Formation of digital sums from signals sent to LVL2

3. 5/13/02J. Pilcher3 Digital LVL1 trigger Non-trivial change at this point LAr only digitizes after LVL1  To use analog pipeline developed for SSC  Could digitize analog sum on detector and transmit TileCal digitizes before LVL1  Need to add digitizations to form tower sums  Geography of digitizer boards not suited to this –Can’t access digits in TileDMU –Signals needed in tower sums are distributed over several digitizer boards

4. 5/13/02J. Pilcher4 Digital LVL1 trigger Forming digital LVL1 TileCal signals  Add digitizations from all PMTs in a tower every 25 ns  Ship off detector  16 bits/tower x 40 MHz = 640 Mbps / tower (OK!)  Use optical ribbon cable with 9 optical signals per ribbon

5. 5/13/02J. Pilcher5 Digital LVL1 trigger What does it take for TileCal?  Revised TileDMU chips  Capable of handling more channels/chip so all signals of a tower are in same chip –Perhaps 1 TileDMU per tower 9 per LB drawer, 7 per EB drawer  Incorporate adder in each TileDMU chip  Revised digitizer boards  4 boards per drawer with up to 3 TileDMU per board –Fewer fine-pitch flex foils and connectors

6. 5/13/02J. Pilcher6 Digital LVL1 trigger Logistics  Need operational experience with present system before proposal  Current system may have “issues” requiring attention –Revised system might address these as well as upgrade  Present groups likely tired of electronics for a while  Many operational and physics issues to address  Could map out design based on current view  Guesstimated cost $2M

7. 5/13/02J. Pilcher7 LV Power Supplies Assumes present power supply plan proves unsatisfactory  “eastern European design”  No experienced engineer or physicist Use near-commercial “bricks”  Plan mechanical mounting and cooling  Monitoring and control  Cabling Logistics  Can’t suggest this before experience with first version

8. 5/13/02J. Pilcher8 Commissioning and Integration Putting the detector together  Surface mechanical assemblies Making it work  Monitoring and control  Calibration  Collecting calibration data  Filling and using data bases  Insufficient resources to support physics personnel at CERN  Students, post-docs, scientists, faculty