EUDET Beam Telescope: status of sensors for the demonstrator

1. EUDET Beam Telescope: status of sensors for the demonstrator Wojciech Dulinski on behalf of IPHC • Outline • Engineering run AMS-035 OPTO • Mimo*3L tests results • Mimosa18 (High Resolution Tracker) tests results • PCBs status • Conclusions and the status summary

2. Layout of the reticle of the engineering run AMS-035 OPTO 07/2006 on 14 µm (standard) and 20 µm epi substrate Several devices of direct interest for EUDET: MimoTEL (256x256, 30 µm pitch), HRTracker (512x512, 10 µm pitch),Mimosa16 (binary readout prototype), MimoSTAR3L, ADC, test structures…

3. MimoSTAR3L tests results • MimoStar3 (2 x 1 cm2) • Same pixel as in MimoStar2: Rad-tol Nwell diode • "Same" architecture design, but • More pixels (x 12.5) • 2 serial outputs at 50 MHz • 1 temperature monitoring probe • 1 ADC (1MHz) for testability • End of October, reception of engineering run • From November to end of 2006, two tests in parallel • Probe station setup preparation for wafer with 14 µm EPI • Laboratory test for circuits with 20 µm EPI • End of 2006 to Jan. 2007, dicing 14µm EPI wafer • Laboratory test for circuits with 14 µm EPI

4. MimoSTAR3L tests results • Power ON + JTAG set test • High power consumption • Missing of HRES layer (high resistivity poly layer) • AMS did not respect one of specification (option) • Biasing DACs out of range • difficult to make circuit working at nominal conditions • Several iterations between post-simulations and tests plus a small modification on the PCB board: MimoStar3 can be set "near" nominal conditions

5. MimoSTAR3L tests results: the summary MimoStar3: 20 µm EPI (results from 1 chip) MimoStar3: 14 µm EPI (results from 1 chip) • MimoStar3 with 14 µm EPI substrate seems to have less noise • Excess noise (at room temperature) comes from excessive dark current… • Comparison of M3 (14 µm EPI) and M2 (14 µm EPI) • Noise  (~ 10 %) • Calibration Peak  (~ 25%) • Yield problem (?)

6. Mimosa18 tests results: calibration using Fe55 source(no HiRes poly in this design) 2,5 MHz (25 ms) • 10 MHz • (6.4 ms) • 10 MHz • (2.5 ms) Two chips calibrated, 3 others verified. All (on 20 µm epi) seems to work  an excellent yield result (?)

7. Mimosa18 tests results: noise measurements • 2,5 MHz ENC = 16 е- • 10 MHz ENC = 12,3 е- • 25 MHz ENC = 15 е- As expected (roughly)…

8. Mimosa18 tests results: “two-peak” spectrum from epitaxy photons 2,5 MHz (25 ms) • 10 MHz • (6.4 ms) • 10 MHz • (2.5 ms) Surprising, under investigation, to be compared with the standard wafer…

9. MimotTEL testing: the beginning • JTAG alive- the rest also seems to work, with a similar performance as observed on MimoSTAR*L…

10. Telescope PCBs and cables Beam area Control room Trigger PCB USB PP MimoTel (or HRTracker) on proximity PCB Auxiliary PCB Clock Tree Clock Root

11. PCB’s status • Twenty PCB front-sets (MimoTEL + HRTracker + Auxiliary) ordered, 5 fully assembled and 5 MimoTELs + 5 HRTs bonded • Remaining fifteens transferred to DESY for the components mounting • For technical reasons, chip bonding refused by DESY workshop, all bonding will be done at Strasbourg • Five sets of clock distribution PCB’s produced, two sets assembled at Strasbourg, one set in use

12. Conclusions/present status • Two wafers (14 µm and 20 µm epi) delivered and diced (wafer NOT thinned)- Preliminary tests of Mimo*L demonstrated non-conformity of process with the option specified for this run (missing HiRes layer)- Serious consequences (however not fatal) for Mimo*L and MimoTEL sensors- Preliminary tests confirms planned delivery schedule to EUDET collaboration- New run (re-processing using the same mask set) should start next week at AMS… For the binary sensor: see Marc’s talk