IceCube Digital Optical Module Production

1. IceCube Digital Optical Module Production R. NahnhauerDESY Rolf Nahnhauer IceCube Spring Meeting

2. Rolf Nahnhauer IceCube Spring Meeting

3. DOM PRODUCTION • Production of up to 5500 Optical Modulesuntil end 2008 : • Gel mixing, filling and potting PMTs • Collar mounting and assembly of electronics • Sealing of DOMs at low pressure • DOM testing in DFL • Harness DOM with suspension • Finally pack DOMs and ship them to the pole Rolf Nahnhauer IceCube Spring Meeting

4. PRODUCTION SCHEDULE xxx Numbers from February 2004 slightly changing with timeBaseline change: 80 strings  70 strings + 10 strings from contingency Rolf Nahnhauer IceCube Spring Meeting

5. Great job…all sites Rolf Nahnhauer IceCube Spring Meeting

6. Should be no problem to do Rolf Nahnhauer IceCube Spring Meeting

7. DOM Main Board Production A plug for John Joseph and LBL, good job here Rolf Nahnhauer IceCube Spring Meeting

8. DOM Production in Total DOM integration will finish 7/08 to 11/08 decision how many DOMs for how many stringshave to be produced, will come in May 2007 Rolf Nahnhauer IceCube Spring Meeting

9. Components for Final Production Rolf Nahnhauer IceCube Spring Meeting

10. DOM TESTING 3 MDFL at PSL 1 DFL at DESY 1 DFL in Uppsala Rolf Nahnhauer IceCube Spring Meeting

11. Electronic and optical requirements Reboot- and communication over a wide temperature range from +20°C to -45°C (or -55°C for ice-top DOMs) Single photo electron detection Wide dynamic signal range – capable to handle large light pulses with up to several 1000 photo electrons per microsecond ime resolution better than 5ns for single photo electron pulses High voltage calibration of the PMT better than 5% Optical sensitivity within low variations for different DOMs Dark noise rates less than 1kHz in ice Mechanical requirements Vibration and pressure fluctuation during transport Rapid temperature variations from +20°C to -45°C Very high environment pressure up to 650 bar DOM Testing Requirements Rolf Nahnhauer IceCube Spring Meeting

12. DOMPASSPORT Main Page Rolf Nahnhauer IceCube Spring Meeting

13. DOM Passport - Example Pages Optical Sensitivity Time Resolution Dark Noise Rolf Nahnhauer IceCube Spring Meeting

14. FAT Status Snapshot in 2006 2007 is also starting out good Rolf Nahnhauer IceCube Spring Meeting

15. 2007 DOM Testing example (DESY) FAT16 FAT17 No dominant error source could be identified in FATsDifferent small problems appeared for all FATs at all sites Only ~1% of DOMs are cannibalized – goal was 5% or betterGood components are used in next years production Rolf Nahnhauer IceCube Spring Meeting

16. DOM SHIPPING Rolf Nahnhauer IceCube Spring Meeting

17. DOM Shipping 2006 Awesome! 957 vs plan of 900 After 06/07 season: 200 DOMs at Pole 256 DOMs at McM Rolf Nahnhauer IceCube Spring Meeting

18. DOM Shipping 2007 Rolf Nahnhauer IceCube Spring Meeting

19. DOM Quality in the Ice ☺ DOMs from all production sites show same behaviour in the ice Rolf Nahnhauer IceCube Spring Meeting

20. Summary DOM mass production is running without problems Production teams well trained Delivery of components mostly smooth Many small problems contribute to test failure rate Total failure rate after rework sufficiently small (better than expected) All sites well prepared for continuous mass production until autumn 2008 Rolf Nahnhauer IceCube Spring Meeting