1. BLM System R2E and Availability Workshop, B.Dehning 1 Bernd Dehning CERN BE-BI 15.10.2014

2. Dose at BLM Tunnel Locations BLM front-end electronics qualified up to 500 Gy Assumed limit of life given by optical LASER diode BLM R2E changes not needed before LS3 But 15.10.2014 R2E and Availability Workshop, B.Dehning 2

3. System overview 3 15.10.2014 R2E and Availability Workshop, B.Dehning Tunnel front-end Custom crate below MQ Custom crate in RR, UA and UJ Surface back-end VME crates in SR and SX buildings

4. System overview 4 15.10.2014 R2E and Availability Workshop, B.Dehning New cabling for the monitors in the collimation region (NE18, NES18, CB and CBH50)

5. System overview 5 15.10.2014 R2E and Availability Workshop, B.Dehning New back-end electronics (threshold comparator) under development to overcome reliability limitations and increase FPGA size

6. System overview 6 15.10.2014 R2E and Availability Workshop, B.Dehning Change of thresholds - noise signal levels and operational efficiency may require to reduce the cable length Development of new radiation tolerant front-end

7. Motivation for Foreseen Changes on BLM System Noise on cables is checked in regular intervals Goal: maximum noise signal a factor 10 below the threshold for the particular channel Exchange of single shielded cables (NE18) with double shielded cables (NES18) done for critical locations (mainly long cables) 15.10.2014 R2E and Availability Workshop, B.Dehning 7 New radiation tolerant front-end (ASICs) located near to detectors

8. New System Layout for BLM front-end BLM ASIC improved current to frequency converter in ASIC (PhD thesis) GBTX ASIC transceiver acts as an interface between the front-end electronics and the optical link 4.8 Gb/s optical link with optional forward error correction or 8b10b encoding Qualification up to 1 MGy Versatile Transceiver and Transmitter (VTRx) Qualification up to 10 kGy, components selected for a dose up to 0.5 MGy 15.10.2014 R2E and Availability Workshop, B.Dehning 8

9. Radiation Tolerant ASIC Development aa 15.10.2014 R2E and Availability Workshop, B.Dehning 9

10. Radiation testing of the BLM ASIC 15.10.2014 R2E and Availability Workshop, B.Dehning 10

11. Summary For run 2 and 3 no global changes are budgeted yet, but developments ongoing for: New front-end with high radiation tolerance New back-end with large FPGA Radiation damage on cables and detectors needs to be monitored 15.10.2014 R2E and Availability Workshop, B.Dehning 11

12. References BLM ASIC G. Venturini, F. Anghinolfi, B. Dehning, F. Krummenacher and M. Kayal, A 120 dB dynamic-range radiation-tolerant charge-to-digital converter for radiation monitoring, Microelectronics Journal, 44 (2013) pp. 1302-1308. GBTx Radiation tolerance (TID) : 1MGy Irradiation results shown at TWEPP14 (Chip was completely functional after this with very few degradation) https://indico.cern.ch/event/299180/session/11/contribution/22/material/slides/0.pdf Price: 60 CHF (P. Moreira) VTRx Radiation Tolerance (TID): 10KGy (Calorimeter level) Some information shown at TWEPP14 (There are two qualification levels for the Versatile Link, calorimeter level 10KGy and Tracker level 500KGy, so far the modules are qualified for Calorimeter level, next iterations will be focused on the tracker level qualification. The two ASICS on the module are qualified for 1MGy, the limiting factor are the Laser diode and the Photodiode) https://indico.cern.ch/event/299180/session/15/contribution/165/material/slides/0.pdf Price: SFP 35e?, LASER 90 e 15.10.2014 R2E and Availability Workshop, B.Dehning 12