European XFEL Annual Report 2010

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02 CIVIL CONSTRUCTION 34 Figure 8 Smaller tunnel boring machine, AMELI, after its test assembly at the manufacturer Figure 9 View of the first metres of the tunnel XTD1 with the end of the TBM in the back (July 2010) Figure 10 First breakthrough of the larger tunnel boring machine, TULA, at Osdorfer Born (September 2010)
Challenges 02 CIVIL CONSTRUCTION By their very nature, large-scale civil construction endeavours face unforeseen challenges and unplanned events. In addition to two unusually hard back-to-back winters, the primary obstacles for the European XFEL civil construction involved the search for explosive residue from World War II and the routine analysis of contamination levels of the excavated soil on all three construction sites. On the DESY-Bahrenfeld site, several anti-aircraft grenades and bazookas had to be removed by specialists or detonated on site. On the Schenefeld site, part of the excavated soil was contaminated with sulphates and arsenic—a finding that contradicted previous results of spot-check drilling that had been performed before the excavation work. The contaminated material had to be disposed of differently than normal soil, resulting in additional costs for the project. In November 2010, during the excavation of the second tunnel, XTD2, a hole with an area of approximately 15 m 2 was discovered on a meadow near a horse farm located above the path of the TBM TULA. The hole was approximately 1.5 m deep and obviously related to the tunnelling process. The area was immediately secured and monitored for changes. After that, it was filled with soil. As studies revealed, the subsidence was caused by a localized, very rare geological formation on the path of the TBM. Even though the probability of such a subsidence occurring again is extremely low, additional monitoring and safety measures were taken for the remaining tunnel construction. Further changes have not been observed. 35
Page 1 and 2: AnnuAL REpoRt European X-Ray Free-E
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Page 5 and 6: Massimo Altarelli Managing Director
Page 7: 05 06 07 08 72 SCiENTifiC iNSTrumEN
Page 10 and 11: 01 about us How it all began In the
Page 12 and 13: 12 scientific and technological dev
Page 14 and 15: 01 about us documents necessary for
Page 16 and 17: 01 about us 16 Scherf signed the Ar
Page 18 and 19: 01 about us 18 Figure 7 Signing of
Page 20 and 21: 01 about us 20 October 2009 Novembe
Page 22 and 23: 01 about us 22 July 2010 August 201
Page 25 and 26: Civil ConstruCtion The European XFE
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DETECTORS AND DATA ACqUISITION To m
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07 Facts and Figures Figure 1 Aeria
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SCIENTIFIC RECORD Thanks to the ded
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WorkShopS school provided general t
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16-17 December 2010, Trieste, Italy
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puBLicationS generalized geometrica
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puBLicationS turning solid aluminiu
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ultrafast X-ray pulse measurement m
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European XFEL Annual Report 2010

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