1. 1 Status of End-cap Modules ● Irradiated modules ● Tracking with irradiated modules ● K5.1 modules

2. 1 Status of Irradiated Modules ● 5 modules (K5.0) irradiated modules ✔ Some at different doses (accidental) ● 2 modules (K5.1) being irradiated

3. 1 IV curves ● IV curves ✔ Confirm that May/June irradiation dose was half of the expected value

4. 1 Irradiation data ● Data corrected for calibration factors and temperature Back to FDR (k5-308) situation with fully irradiated modules Source meass. needed for max. threshold for efficiency

5. 1 K5-312.vs. K5-308 ● K5-312, K5-308 after full irradiation ● K5-312 shows some “timing” problems

6. 1 Test beam – Eff. vs Occup. ● K5-308, can operate within specs in a narrow threshold window. ● K5-310,K5-312: received half of the dose. In specs. K5-310K5-312K5-308

7. 1 Test Beam – Signal/noise ● K5-308, s/n is slightly higher than 8 at 500V ● K5-310,K5-312: s/n flattens at ~350V with a value of ~11. K5-310K5-312K5-308

8. 1 Tracking ● Tracking studies made with 3 irradiated end-cap modules: ✔ 2 of them were not fully irradiated. ✔ Efficiency is product of individual efficiencies ✔ Det. Bias only affects efficiency ✔ Number of planes decreases fake rate. ⇨ With 4 planes (barrel) fake rate is <10 -4 for occupancies up to 5x10 -3.

9. 1 K5.1 modules ● 4 modules have been built (2 with perfect chips,2 with 1ch dead chips) ✔ K5-501,K5-503: Valencia ✔ K5-502,K5-504: Geneva ● All off them showed “features” when tested in the boxes after construction.

10. 1 K5.1 Modules ● Plug & play in the system sector disk (all) ✔ Decision is made to irradiate the modules with perfect chips. ● First suspicion: electrical versus optical readout ✔ Optical readout works in the box ✔ Redundant (electrical) readout works on the disk ● “Undo” any grounding “improvement” in the ST trying to make the modules fail (no way) ● Suddenly the modules start working properly in the box... ✔ 2 more modules are being built to understand the problem ● Other issues: ✔ A drop of an oil-like substance is found on top of a chip in one of the modules. Could be removed ✔ Oil-based, “micrometric” contamination found in 2 of the modules.

11. 1 K5.1 contamination

12. 1 Conclusions ● Need to “source” irradiated modules: ✔ Noise figures comparable to 308 in July/August. ✔ Charge and S/N ??? ● Tracking... ✔ Up to 5x10 -3 noise occupancy can be tolerated in terms of fake rate with 4 planes of modules.... ● K5.1 ✔ 2 modules being irradiated ✔ 2 more modules being built. ✔ Total of 4 modules could soon be used in the ST