April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 1 IceCube Digital Optical Module Production R. Nahnhauer DESY

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 2

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 3 DOM PRODUCTION Production of up to 5500 Optical Modules until 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

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 4 PRODUCTION SCHEDULE Numbers from February 2004 slightly changing with time Baseline change: 80 strings  70 strings + 10 strings from contingency xxx

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 5 Great job…all sites

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 6 Should be no problem to do

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 7 A plug for John Joseph and LBL, good job here DOM Main Board Production

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 8 PYYearDOMs ready at PSL DOMs ready in Sweden DOMs ready at DESY 034/04-3/ /05-3/ /06-3/ /07-3/ /08-3/09~200~185~200 DOM integration will finish 7/08 to 11/08 decision how many DOMs for how many strings have to be produced, will come in May 2007 DOM Production in Total

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 9 Components for Final Production

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 10 DOM TESTING 3 MDFL at PSL 1 DFL at DESY 1 DFL in Uppsala

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 11 DOM Testing Requirements 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

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 12 DOM PASSPORT Main Page

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 13 DOM Passport - Example Pages Dark Noise Optical Sensitivity Time Resolution

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting is also starting out good FAT Status Snapshot in 2006

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting DOM Testing example (DESY) timeloadgoodbad  FAT FAT FAT FAT FAT16FAT17 No dominant error source could be identified in FATs Different small problems appeared for all FATs at all sites Only ~1% of DOMs are cannibalized – goal was 5% or better Good components are used in next years production

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 16 DOM SHIPPING

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 17 Awesome! After 06/07 season: 200 DOMs at Pole 256 DOMs at McM 957 vs plan of 900 DOM Shipping 2006

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 18 DOM Shipping 2007

April 26, 2007 Rolf Nahnhauer IceCube Spring Meeting 19 DOM Quality in the Ice DOMs from all production sites show same behaviour in the ice ☺

April 26, 2007 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