Transcript SED-CERN-Meetingx

LHC ground motion monitoring :
Seismic network
M. Guinchard – EN/MME
with contributions from many people from integration, civil
engineering team, LHC operation, etc…
SED Collaboration meeting – 12th May 2016 at CERN
OUTLINE
 Introduction
 Motivations
 Agenda
EN/MME M. Guinchard, 12th May 2016 at CERN
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The Large Hadron Collider (LHC)
Some numbers:
~ 5,000 LHC superconducting magnets
The
LHC,
the world’s
largestleak-tight
and most
~ LHC
cryogenics
need 40,000
powerful particle
accelerator, is the
pipe junctions
~ 12 million
liters
liquid nitrogen
are
latest
addition
toofCERN’s
accelerator
vaporized during
the cool
downof
of a
31,000
complex.
It mainly
consists
27 km
tonsof
of superconducting
material and the total
inventory
of a
ring
magnets
with
liquid helium is 700,000 liters
number
of accelerating structures to
~ 10-50μm of beam stability according to
boost the operation
energy ofconditions
the particles along
the~way.
1-5μm of magnetic center stability
EN/MME M. Guinchard, 12th May 2016 at CERN
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The Large Hadron Collider (LHC)
EN/MME M. Guinchard, 12th May 2016 at CERN
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The Large Hadron Collider (LHC)
EN/MME M. Guinchard, 12th May 2016 at CERN
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Vibration effects
 Performance degradation of the LHC due to beam
offsets at IP, emittance growth from noise etc,
 Beam aborts if vibrations exceed a critical threshold,
leading to large orbit excursion and beam losses above
BLM thresholds.
EN/MME M. Guinchard, 12th May 2016 at CERN
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Motivations
 Two projects motivates the network installation :
 High Luminosity LHC - CERN
Monitoring of civil engineering activities to
anticipate effects on the particle beams stability
 “Géothermie 2020” – SIG
Monitoring of the micro-seismicity to assess the
impact of earthquakes induced by geothermal
energy production
EN/MME M. Guinchard, 12th May 2016 at CERN
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Motivations for High Luminosity LHC
 The HL-LHC civil engineering work implies the construction
of new access shafts and underground galleries
 This work will be partially done during LHC operation at
approximately a distance of 40m to the actual LHC tunnel
EN/MME M. Guinchard, 12th May 2016 at CERNc
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Motivations for High Luminosity LHC
 Sensitivity study carried out during the last year confirmed
that civil engineering activities are critical for the LHC beams
EN/MME M. Guinchard, 12th May 2016 at CERN
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Motivations for Geothermie 2020
 Earthquake and LHC operation
A magnitude 7.6 earthquake in Costa Rica (05/09/2012 @ 14:42:10 UTC)
‘struck’ the LHC during stable colliding beams.
Arrival of the first waves at CERN ~15:06 UTC.
PP?
1 hour !
T ≈ 25 s
P
Surface
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Motivations for Geothermie 2020
 Large earthquakes (M ~6-8) have a clear impact on LHC even at
a large distance from the LHC ring. We have survived all events
(maybe with some luck !).
 Resonance report confirmed the sensitivity of our installations :
EN/MME M. Guinchard, 12th May 2016 at CERN
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Motivations
Install a network of geophones should help us to :
 Monitor civil engineering activities and anticipate their
effects on the beam stability

Need to use very sensitive /low noise equipment's
 Assess better the possible impact of earthquakes
induced by geothermal energy production.
 Need to use standard seismic equipment's
EN/MME M. Guinchard, 12th May 2016 at CERN
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Agenda






Introduction about CERN motivations to install a network of seismic sensors –
Michael
Results of the last measurements done by CERN : Selection of the hardware
for the CERN Network (Surface / Underground) – Morgane
Status of the CERN software and the miniseed data transfer from CERN to
SED – Kevin
Results of the last measurements done by SED on the CERN Surface Site –
SED
SED proposal for surface measurements (Vault Conditions) - SED
Conclusion CERN-SED
EN/MME M. Guinchard, 12th May 2016 at CERN
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Thank you
EN/MME M. Guinchard, 12th May 2016 at CERN
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