Status Report on Survey and Alignment Efforts at DESY
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1 Status Report on Survey and Alignment Efforts at DESY Markus Schlösser Johannes Prenting
2 Contents PETRA III Overview Network design Foundation soil R & D DESY - HLS LiCAS XFEL legal procedure Instrumentation FARO trackers
3 Accelerator structure at DESY HERA has its final shutdown in June 2007 PETRA is not used as a pre-accelerator any more PETRA will be converted into a Synchrotron Light Source (PETRA III)
4 Picture of P3 FLASH-crossing new P3 hall
5 PETRA III hall (fotomontage)
6 reference network PETRA has no reference network machine bears the reference information install new reference points in the tunnel transfer information to reference points transfer external coordinates into tunnel remove machine completely during rebuilt new reference points ready }history } present } future
7 GPS-network pillar on PETRA wall plumbing instrument inside tunnel
8 tunnel network rectangular tunnel shape target marks magnets reference points
9 tunnel network (adjusted) 3/8 of the ring measured during shutdown 2005 circular sections 3D view straight sections top view RMS = 0,08mm?
10 Soil of the new Hall depth of clay layer under the surface Question: Could impound water on the clay cause deformations of the new hall? Solution: Measure relative deformations of the existing tunnel with a HLS
11 distribution of HLS in PETRA N 20 13,12 9,8 5,4 1 18,17 15,14 11,10 7,6 3,
12 Comparison with Distance-Sensor HLS-12/13 distance sensor construction joint ring magnet
13 Results of HLS heigth difference fourier spectrum
14 displacements in construction joints N maximum displacements [µm]
15 XC between sensors HLS distance sensor cross correlation
16 XC with machine energy HLS machine energy cross correlation lag of ~ 1h
17 XC with rainfall HLS rainfall cross correlation
18 results HLS movements confirmed no correlation between tunnel movement and rainfall strong correlation between tunnel movement and machine energy with a lag of ~ 1h mechanism is not fully understood yet
19 XFEL Greetings from Johannes Prenting Approval statement was published on August 9, 2006!
20 Technical vertical shape of tunnel has been fixed XFEL- Linac equipotential surfaces 0.11 m 0.20 mrad 0.16 mrad 0.08 m photon beam
21 Alignment concept shaft XS1 main linac SLRS reference marks cross cut photon tunnels reference marks cross cut SLRS is connecting the arriving with the straight outgoing tunnel Other tunnels are attached via cross cuts works for all shafts
22 LiCAS project ILC / TESLA easy and fast survey of large linear reference systems First prototype should be ready in the DESY test tunnel by the end of 2006
23 Geodetic Instruments Two FARO SI/SI2 trackers bought in 2002 and 2004 Both have errors in Interferometer distance measurement (even directly after service!) Errors happen from once a week to several times a day Size of error from some 0.1 mm up to 433mm (so far) Don t know how to provoke the error
24 Measurement results Target Time Azimut [gon] Vertical [gon] Distance [m] 6-B4 18:34: da [mgon] dv [mgon] dd [mm] 6-B4 18:57: B4 18:59: B4 19:02: Error happens with brand new SMR and normal conditions Error happens even direcly after homing Workaround: measure all points twice! Not applicable for scanning surfaces etc.
25 Beam loss After Service, error seems to happen less frequently but: beam loss rate increased dramatically Test setup: Tracker looks at slowly moving target v = 10cm / 30s Tracker looses beam within 2 min (repeatable) FARO was not able to solve the problem for nearly one year now
26 and finally for something completely different this has been our company christmas party 2005
27 Thanks foryourattention!
28 details of PETRA III Start of Conceptual Design: 2002 Final approval: May 2005 Reconstruction begins: July, 1st, 2007 User operation: 2009 Costs 225 Million 90% German federal government 10% City of Hamburg
29 technical details of PETRA III new 280 m long experimental hall 14 beamlines with up to 30 experimental stations highest brilliance and flux broad photon energy range (about 0.2keV to 3keV) Energy 6GeV Current 100mA 200mA Emittance 1nmrad
30 GPS-network Pillars on DESY site Bolts in the tunnel (with plumbing tube to the surface)
31 Installation of HLS PETRA tunnel view measurement pots HLS two tube crossing
32 results magnitude of displacement depends on position largest displacement in middle of octant smallest displacement at joint between hall and tunnel -> physicists refused to accept this -> installation of an independent measurement system
33 comparison of HLS and direct distance HLS Spikes distance sensor Drift
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