1. ECAL Monitoring System Ivan Korolko (ITEP Moscow) PRR, September 2004

2. Outline  Finalized light splitter  Fiber bundles configuration  Light distribution boxes  LED drivers and PIN diode boards  Planning

3. Light splitters 1) Very simple construction 2) Good uniformity of light yield for all fibers 3) Good reproducibility 4) High light yield Produced and tested this summer

4. Light splitters uniformity ● central fiber ● 1 st circle ● 2 nd circle ● 1.2 mm fibers

5. Light splitters – LED housing

6. Fiber bundles Fibers in bundle have different length to lighten the connection to optical contacts. (max ~50cm) Corresponding number of fibers is grouped in bundle and molded with epoxy resin. High temperature bending of fibers – technology optimization requires quite some man power (now) dangerous to break a fiber HERA-B experience (curved fibers forming bundle)

7. Fiber bundles configuration (1) Outer and Middle sections: Splitters 1 → 16+3 Inner section: Splitters 1 → 9+3

8. Fiber bundles configuration (2) Inner section: reduced number of LEDs (factor 1.5)

9. Components of monitoring system LEDsPiN diodesTrigger signals Outer842884 Middle561456 Inner882288

10. Routing of bundles (1) 25 mm trays for inner ECAL section

11. Routing of bundles (2) 37 mm trays for middle ECAL section

12. Routing of bundles (3) 45 mm trays for outer ECAL section

13. Light distribution boxes (1)

14. Light distribution boxes (2)

15. LDBs for one half of ECAL XYZ size# of LEDs# of PiNs Upper box720x880x1206017 lower box 1720x880x1206017 lower box 2720x880x1205616 lower box 3624x500x120267 lower box 4624x500x120267

16. Light distribution box (fragment) LED driverLEDSplitterPiN diodePiN diode board LED-PiN fiber Bundles

17. 1 st lower box Box size 720x880x120 Led driver 15x100 mm 2 PIN diode board 40x100 mm 2 Power for LEDs+5V, +25V Power for PINs+/-6V, +25V Trigger signals LED amplitude control voltages

18. LED drivers (1) Several LED drivers produced and tested during this summer beam tests Dedicated ECAL version of LED driver (produced in IHEP)

19. LED drivers (2) DS0026 became obsolete (still available from distributors) PCB design and prototypes exist for:  pin-to-pin compatible EL7212, ICL7667  EL7104  SN75372 DC isolation of the triggering signals requires individual triggering for each LED driver.

20. PIN diode boards (1) Dedicated ECAL version of PIN diode board (produced in IHEP) PIN diode boards produced and tested during this summer beam tests

21. PIN diode boards (2)  Charge gain~300  ENC~5000 electrons  δ function response~10 ns.  Dynamic range12 bits  The same clipping line as for PMTs is used Amplifiers are based on LMH6624 or EL5133

22. Planning (1) Many changes during last months ECAL installation should be finished on 31 of July The whole planning is quite tense

23. Planning (2)  Production of bundlesstarting on 04/10/2004 special “long” room with shelves is ready  Cutting of bundles starting on 25/10/2004 need to prepare cutting tools  Should be finished in March  Installation of bundles : 15/04/2005 – 15/05/2005

24. Planning (3)  Detailed design of LDBs : 15/12/2004 meeting in Moscow or at CERN (Stas)  Production of LDBs starting on 15/01/2005  Installation of LDBs starting on 15/05/2005  Final connection of all components 01/06/2005 – 01/07/2005

25. Planning (4)  Production of LED housings 01/11/2004 – 1/03/2005 should be delivered to CERN in March  LED drivers and PIN diode boards purchase of components – ASAP mass production 01/01/2005 – 01/03/2005 should be delivered to CERN in March  temporary readout system to check the work of LEDs and PMTs ??? Seems to be useful ???