Deformations and Movements of CERN installations Mark Jones M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Outline Introduction Geologigical Effects on Accelerator Installations Civil Engineering Effects on CERN Installations Summary M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Introduction Presentation assimilated from previous reports and studies LEP / LHC Complex SPS Complex PS LHC Experiments Survey reference point measurements Geodetic reference networks Machine and experiment elements In the SURVEY database since 1980s M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Introduction Analyses Movements between survey measurement campaigns Some deformation analysis Complicated by re-alignments for the accelerators Supports between accelerator elements and tunnel floor can be source of movements Points not directly on the ground Relative differences Some deep reference points for vertical control Some doubts regarding their stability M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Geological Effects Accelerator Installations LEP / LHC SPS Complex PS Complex Experiment Installations ATLAS CMS M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

LEP / LHC Tunnel M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

LEP Vertical Offsets M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

CLIC MODULE WORKING GROUP GROUND MOTION STUDIES How to prevent or, at least, anticipate it ? 28 January In LEP area, there are 3 main geological anomalies : The Allondon “Sillon”, The Sergy “Sillon”, The Montfleury “Sillon”. The first one had been taken into account. But the 2 others were not expected… (Ref 2)

CLIC MODULE WORKING GROUP GROUND MOTION STUDIES Geological cuts… 28 January

CLIC MODULE WORKING GROUP GROUND MOTION STUDIES Then… 28 January Allondon Sergy Montfleury Nominal zero : 17mm in point 1 It’s nearly impossible to have a perfectly stable place. Solutions exist (good tunnel floor engineering, good drainage, etc.) but the main is to know the high risk places… (Ref 2)

LEP / LHC References Deformation and Movement Analysis of LEP JIN F., , Post-doctoral Thesis, CERN Ground Motion Studies T. Touze, , CLIC Module WG M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

SPS Complex TT10 TT20 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

TT10 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

TT20 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

SPS Complex References SPS Ring Stabilite Verticale des Tunnels du SPS J.-P. Quesnel, , LEP/SU/Int. 890s Controle Stabilite TT10 (Decembre 2007) C. Podevin, , EDMS: Controle de Stabilite du TT20 – Nivellement des points sol C. Podevin, , EDMS: M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

PS Complex M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

LINAC 4 Civil Engineering predicted movements of up to 5 mm in the first few years M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

LINAC4 : SU Network 7 GGPSO (2010, 2015), 2 CRO (2010) 5 pillars ( ) ~ 40 reference points (2015) LINAC4 - JF. FUCHS (EN-MEF-SU)19

2012 – 2015 : GGPSO, CRO LINAC4 - JF. FUCHS (EN-MEF-SU)20

LINAC 4 Tunnel network measurements Deformation between Linac tunnel and transfer line Elements re-aligned 2015 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

PS Complex References LINAC4 : H network (2012 – 2015) J.-F. Fuchs, 2015 (presentation) M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Experiment Installations M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Expected Cavern Movements No predictions known by SU for the ALICE, LHCb and CMS caverns For LHC, civil engineering predicted that some cavern movements could be expected during/after construction. Predictions for ATLAS Cavern (EDMS: ATC- T-ER-0004) Up to 2 mm settlement after floor concreting Up to 5.5 mm settlement predicted after ATLAS in place (during first 6 months) Of the order of 1 mm uplift per year thereafter M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

ATLAS M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

16 Feb 2011 D Mergelkuhl BE/ABP/SU EDMS: Points on the Floor 8 Points on the Bedplate HLS A side C side TCUSA (HLS) TAUSA (HLS) C17-14 (Floor)A17-14 (Floor) ATLAS – stability points Deep Reference L Tunnel Levelling Link with cavern floor /HLS Deep Reference R

ATLAS – floor stability Reference are deep references in LHC tunnel close to IP1 Time between measurements varies from 3 to 18 month Precision for single epoch 0.2 mm/1 sigma; 0.3 mm between 2 epochs Distance between lateral walls -15 mm/8 years (2003 – 2010) M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

16 Feb 2011 D Mergelkuhl BE/ABP/SU EDMS: mm on BAUSA /change of BAUSA due to maintenance Result of ATLAS bedplate HLS Precision 0.03 mm/1 sigma

ATLAS – floor stability M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

ATLAS References M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting Long Term Floor Movement Measurements in LHC Experiments D. Mergelkuhl EDMS: ATLAS UX15 Floor Stability V. Batusov, N. Azaryan, D. Mergelkuhl EDMS:

CMS M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

16 Feb 2011 D Mergelkuhl BE/ABP/SU EDMS: Reference: deep references CMS – floor stability (leveling)

CMS – floor stability Floor stability Deep references in UX55 stable to “very local” vicinity Measurements linked to the Deep Reference Points in UX55 7 epochs March 07 – March 15 movement up to -1.6 mm in ~8 years around YB0 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

ACCURACY OF THE RESULTS : +/- 0.05mm CMS – floor stability at deep references NO SIGNIFICANT MOVEMENT OF THE CMS CAVERN AT THE DEEP REFERENCES PLACE

CMS – floor stability M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

CMS stability Relative HLS system on YB0 feet No inclination visible on feet of YB0 System in very good running from Apr 2008 The system is measuring continuously and is controlled periodically (filling/purging tests) M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

CMS References Readings carried out on the 5 deep references from September 2006 to March 2015 A. Behrens, A. Maurisset EDMS: Long Term Floor Movement Measurements in LHC Experiments D. Mergelkuhl EDMS: M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Civil Engineering Effects LEP / LHC IP1 / ATLAS SPS Complex SPS Ring – Sextant 6 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

LEP / LHC IP1 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

LEP: monitoring during LHC CE works In 1998 WPS sensors have been installed in IR1and IR5 Length of wire 120 m 11 sensors installed on quadrupoles magnets or on floor points ??? and two at the extremities where it was considered to be stable. Affected area 60m Courtesy of JPQ, IWAA 99

LEP: monitoring during LHC CE works Mvt in pt1 during six months in V Courtesy of JPQ, Iwaa 99

LEP: monitoring during LHC CE works Since Aug 2000, the sensors indicates mvt in PT1 in V bigger than 4 mm A standard measurement was done and a realignment Very small mvt in R ~ mm

SPS Complex SPS Ring Sextant 6 M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

The SPS sextant 6

Almost 3-4 mm every 10 years, about 15 mm in total ! The movements were : At the beginning more important on the first Xing pt Then on the 2 nd one

LEP / LHC & SPS References SPS Ring Stabilite Verticale des Tunnels du SPS J.-P. Quesnel, , LEP/SU/Int. 890s Ground Movements in CERN Underground Facilities D. Missiaen, 2010 (presentation) LEP / LHC Ground Movements in CERN Underground Facilities D. Missiaen, 2010 (presentation) M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Summary Significant ground movements in a few accelerator zones Geological – LHC S78 Civil Engineering – SPS Sextant 6 Regular measurements carried out TI8 unstable – no long term analysis M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Observations Need good geological data to identify other correlations – GIS, CE? CE systems Extensometers in LHC Experiment Halls Ground water table sensor at Pt 4 What data is available, are they still working? What information do you need? M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting

Deformations of the LEP tunnel M. Jones, 28/10/2015 FCC Infrastructure and Operation Meeting