FCC Week 2015
Program of I&O presentations
Ph. Lebrun
25 February 2015
FCC Week 2015
Ph. Lebrun & P. Collier
FCC Week I&O Program
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Ph. Lebrun & P. Collier
FCC Week I&O Program
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I&O plenary talks
Monday 23 March 2015
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FCC Infrastructure & Operation studies: progress and outlook (Ph. Lebrun)
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Abstract: In complement to the largely site-independent accelerator science and technology
study for Future Circular Colliders (FCC), the infrastructure necessary for implanting such
machines in the neighbourhood of CERN is being studied, together with their operational
aspects as part of the future accelerator complex. Main issues identified and progress made on
possible solutions since the kick-off of the study in February 2014 will be presented, in domains
as diverse as geology and civil engineering, utilities, cryogenic refrigeration, control concepts,
machine integration, logistics and installation, reliability and availability, power and energy
consumption as well as conventional and radiological safety.
Evolution of a global HEP computing infrastructure towards FCC (I. Bird)
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Abstract:
Ph. Lebrun & P. Collier
FCC Week I&O Program
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4 sessions of 1h30 on Thursday 26 March
Ph. Lebrun & P. Collier
FCC Week I&O Program
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08h30-10h00 [1/2]
4 talks of 18+4 min
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Civil engineering and geology (J. Osborne)
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Abstract: The feasibility of an 80 km-10 0km tunnel to house the Future Circular Colliders (FCC)
is currently under investigation at CERN. This presentation describes how CERN’s civil
engineering team are investigating the optimal position for such a new machine in the Geneva
area. The first results from a bespoke interactive tool, containing a 3D geological model of the
Geneva basin, are presented.
Transport & handling considerations for FCC (I. Ruehl)
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Abstract: The logistics regarding material flow and people access of any accelerator in
underground areas is a challenging factor that has an important impact during the installation
as well as during the operation phase. The FCC layout with important shaft depths and large
distances between the shafts presents an unequalled challenge in this respect. The paper will
describe some first preliminary transport and handling studies regarding available lift, crane and
tunnel transport technologies, their feasibility, their limitations and layout configurations. The
findings will have a direct impact on the logistical aspects and consequently on the intervention
/ installation time of FCC as well as on the civil engineering layout of buildings, shafts,
underground caverns and tunnels, which will consequently have an important impact on the
costs.
Ph. Lebrun & P. Collier
FCC Week I&O Program
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08h30-10h00 [2/2]
4 talks of 18+4 min
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A key quality attribute of a Future Circular Collider: availability performance
(RAMS) (P. Sollander)
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Abstract: Reliability and availability become key indicators for the performance of accelerators
when integrated luminosity cannot be increased by higher peak luminosity. Grossly scaling
downtime from equipment faults seen on CERN’s Large Hadron Collider to FCC by a factor four
suggests that the FCC could do no physics at all. A study is started to assess if methods and
tools successfully used to improve reliability and availability in large industrial and governmental
projects could be applied to accelerator projects. A collaboration with the Tampere University of
Technology who has already made reliability studies for oil rigs, nuclear waste management and
military systems will help assess the applicability by modelling an existing accelerator and
validating the model with physics data.
Energy and power estimates (R. Steerenberg)
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Abstract:
Ph. Lebrun & P. Collier
FCC Week I&O Program
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10h30-12h00 [1/2]
4 talks of 18+4 min
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Cryogenics (L. Tavian)
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Abstract: The cryogenic system of FCC-hh and FCC-ee will require unprecedented cooling
capacity to be transported over unprecedented distances. The corresponding project study has
challenged the cryogenic community and triggered specific studies in order to conceptually
design the cryogenic systems and to identify the limitations of the present state-of-the-art as
well as the developments which will be needed to fulfil the FCC requirements. This presentation
will recall the main challenges of the FCC cryogenics and will show the corresponding study
organization and roadmap towards the conceptual design report. Preliminary results will be also
presented.
Large-capacity helium refrigeration: from state-of-the-art towards FCC
reference solutions (F. Millet)
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Abstract: Large unit-capacity cryogenic plants are required to cool high-field superconducting
magnets of FCC-hh, high-gradient superconducting RF cavities of FCC-ee as well as for the
cooling above 40 K of heavily-loaded FCC-hh beam screens, thermal shields and current leads.
Such cryogenic plants require (1) unit refrigeration capacity 3 to 4 times larger than the present
state-of-the-art (FCC-hh), (2) non-conventional thermal load distribution with very large
synchrotron radiation to the beam screens (FCC-hh) and (3) high-efficiency and high-reliability
to minimise the operation cost and to increase the overall availability of the future accelerator
complex. A preliminary review of the state-of-the-art of large-capacity helium plants will be
presented and the roadmap to define reference solutions for the FCC cryogenic plants will be
proposed.
Ph. Lebrun & P. Collier
FCC Week I&O Program
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10h30-12h00 [2/2]
4 talks of 18+4 min
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Cryogenic refrigeration with neon-helium mixtures: roadmap and first results
of TU Dresden study (S. Klöppel et al.)
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Abstract: At an early stage of the FCC evaluation the heat load caused by synchrotron radiation
and the necessity of a beam screen cooling had been identified as a major issue. For a number
of reasons and restrictions the beam screens must be kept within between 40 and 60 K. For
FCC-hh the heat load including the respective thermal shields piles up to 500 kW + 70 kW =
570 kW for each of the 12 sectors. An important aspect is the hydraulic impedance of the beam
screen, presently assumed to be equivalent to 230 straight pipes of 5.55 mm inner diameter
and 30 m in length per sector. A highly efficient cooling plant is pursued. As a novel approach,
the use of a helium-neon mixture as refrigerant was found advantageous. Especially promising
is the possible substitution of oil flooded screw compressors by more efficient turbo
compressors. This presentation investigates different flow schemes and mixtures compositions
with respect to complexity and efficiency. Furthermore, thermodynamic aspects, e.g. whether to
use cold or warm secondary cycle compressors are discussed.
Cooling the FCC beam screens (L. Tavian)
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Abstract: The high-energy hadron beam of FCC-hh will generate up 28 W/m of synchrotron
radiation for the 100-km circumference tunnel and up to 44 W/m for the 80-km circumference
option. This specific heat load is more intense with respect to the LHC by more than 2 orders of
magnitude. Therefore, beam screens are definitely mandatory to absorb the synchrotron
radiation at higher temperature than that of the superconducting magnets and thus reduce the
entropic load on the refrigeration system. After explaining the main cooling constraints of the
beam screens, this presentation will give a preliminary design of the beam-screen cooling loop
using helium or neon, for different cooling channel geometry with emphasis on cooling length
limitations and exergetic efficiency.
Ph. Lebrun & P. Collier
FCC Week I&O Program
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13h30-15h00 [1/3]
4 talks of 18+4 min
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Control concepts for future circular accelerators: why it is not too early to
speak about them (Ph. Gayet)
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Abstract: Control and data acquisition systems for accelerators, detectors and infrastructure are
traditionally considered as independent, loosely coupled, process- or equipment- specific and
consequently should rely on different technical and architectural solutions. However, the
experience acquired with the LHC has shown that common solutions can successfully be applied
resulting in significant cost and manpower savings. Therefore a study is launched to identify the
commonalities and specificity of the Future circular collider (FCC) controls and data acquisition
systems together with an assessment of the key numbers relevant for estimating cost and risk.
After a brief recall of the control and data acquisition duties, this presentation is twofold. First
we conduct a comparative review of the LHC and potential FCC systems in order to identify
similarities and differences , to extrapolate the key numbers for FCC and to present the areas of
required research and development. Second we would like to present a cooperation model
where the various developments and innovative ideas related to the control and data acquisition
systems could be shared, evaluated and promoted, from this early stage of the project.
Ph. Lebrun & P. Collier
FCC Week I&O Program
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13h30-15h00 [2/3]
4 talks of 18+4 min
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Lessons learnt and new concepts for conventional safety in FCC (A. Henriques)
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Abstract: Future Circular Colliders (FCC) under study at CERN will face conventional safety
challenges throughout their life-cycle, from fire prevention in an unprecedented large
underground facility to environmental protection in the surroundings. Studies are being
performed in order to propose risk prevention and mitigations measures to achieve an
acceptable risk level and ensure the safe operation of the installation. Such a project with new
machines, underground infrastructure and layouts offers the opportunity to study new ideas,
first based on lessons learnt from former or present facilities and second based on new
concepts to improve safety. The main domains for conventional Safety in similar installations,
e.g., air management, oxygen-deficiency hazard, static confinement and fire compartments, will
be assessed in this presentation together with the integration of new concepts, e.g. smoke
extraction and egress. The direction shall aim towards an “optimal solution” with respect to
safety and its importance to anticipate future advancements in technology.
Ph. Lebrun & P. Collier
FCC Week I&O Program
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13h30-15h00 [3/3]
4 talks of 18+4 min
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Optimised civil engineering layout for radiation protection in FCC (M. Widorski)
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Abstract: The framework and concepts of radiological protection have evolved considerably over
the last 30 years. In parallel, the technological and organisational tools have developed fast as
in many other technical domains. The CERN study of Future Circular Colliders (FCC) gives us the
opportunity to apply these for radiological optimisation from the very beginning in the
conceptual phase of this project. The radiation protection measures to protect the personnel
and the environment are numerous. They need to be applied from the design to the
decommissioning phase covering control and minimisation of stray radiation and the production
of radioactivity, maintenance and intervention optimisation to reduce doses to the personnel
and the final decommissioning and disposal concepts for the produced radioactive material.
Awareness for these questions by accelerator and experiment designers is of crucial importance
for a successful implementation of radiation protection at the FCC. A focus in the study phase is
directed towards an optimised civil engineering layout. Optimal access and working conditions
for the personnel and the implications for an ideal air management have to be taken into
consideration. The presentation will outline basic guidelines and parameters important to
radiological protection.
Discussion
Ph. Lebrun & P. Collier
FCC Week I&O Program
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15h30-17h00
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This session, originally allocated to I&O, is now reserved for contributed short
communications from institutes participating to the FCC study
Ph. Lebrun & P. Collier
FCC Week I&O Program
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