Scope of the DT contribution to the CO2
cooling plant for the LHCb upgrade
Paolo Petagna
LHCb CO2 Cooling Meeting – CERN– 14 Jan 2015
From ECFA HL Workshop 2015
Standard steps for a global approach to thermal management:
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Definition of thermal loads.
Definition of on-detector thermal contact.
Simulation & mock-ups for evaporative cooling design.
Definition of the complete operational envelope.
Definition of the environmental conditions.
Definition of optimal cooling distribution granularity.
Dimensioning and design of transfer lines.
Design of cooling plant.
LHCb CO2 Cooling Meeting | CERN | 14 January 2015
P&ID
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From LHCb CO2 meeting of July 7th
Slide #3 of Bart’s talk:
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Possible scope of PH-DT contribution
PH-DT can accept the following commitments:
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Collaboration with LHCb to the preparation of the P&ID
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Engineering design of the cooling plants’ mechanics
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Functional analysis and definition of controls and operation procedures
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Procurement of all cooling plant HW components (mechanical and electrical)
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Construction of the two cooling plants (mechanical and electrical)
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Control SW programming and implementation
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Installation of the cooling plants in the cavern
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Commissioning of the plants
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M&O of the plants in connection with detector experts
PH-DT is of course fully open to collaboration with LHCb groups on anyone of
these tasks
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Out of scope of PH-DT contribution
PH-DT cannot accept the following commitments:
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Responsibility on the definition of the detector cooling/environmental requirements
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Responsibility on the definition/design of the detector evaporators (local thermal management)
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Responsibility on the definition of the detector segmentation/operation mode
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Responsibility on the definition/design of the transfer lines
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Installation of the transfer lines and ancillary systems in the experimental area
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“Typical” TC tasks, like space allocation, primary supplies, etc…
However, as these are all steps of the “global approach” discussed
above, PH-DT is prepared to an active participation in constructive
discussions on these issues with the responsible LHCb teams.
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Additional LHCb responsibilities
The commitments listed in slide 6 are however subject to certain “conditions”:
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Issuing of a complete set of requirements for each detector
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Set-up of teams for the design of the detector evaporators
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Endorsement of a local thermal management expert for each detector as reference interface
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Endorsement of a well identified interface with the experiment’s integration for both mechanics and
controls (“Cooling Coordinator”, as in ATLAS and CMS, or other)
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Endorsement of an engineer responsible for the design of the transfer lines
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Ensured availability of sub-detector experts during operation
Additionally, some support for the elaboration of the 3D models and fabrication
drawings is likely to be required.
The EO section in PH-DT has reserved to cooling a relevant fraction of a
senior designer: however, depending on the timeline and on the cumulus with
other tasks and additional external resource might be needed.
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What about the P&ID?
The P&ID is the final document required to launch the engineering design:
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It is based on clear and complete sets of requirements for both detectors
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It requires a good understanding of the detector evaporators
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It freezes the operational segmentation of the detectors
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It takes into account at least a first design of the transfer lines
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It is the agreement between all parts on what is going to be built and delivered to the pit
The formal responsibility for the P&ID as a “deliverable” can be discussed, but
the preparation of the document implies an active participation from the
detectors and involve signature by the responsible persons.
In particular PH-DT, in the context of the agreed process of completion of
knowledge transfer from NIKHEF, heavily counts in the direct
involvement of Bart Verlaat in the definition and preparation of the P&ID.
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Main technical issues of worry today
From our experience, some technical issues require urgent steps forward:
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UT: properties of CO2 flow evaporation in long vertical pipes
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Velo: properties of CO2 flow evaporation in micro-channels
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Velo: properly controlled distribution of micro-flow to a set of parallel micro-evaporators
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Velo: safety interfaces with the secondary vacuum
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Timeline
The PH-DT Cooling Team has limited resources and a growing number of
projects ahead: on top of the ongoing work on CMS PIX and ATLAS IBL, we
already received a preliminary request from CMS for an additional plant in
P5; we certainly expect a peak of activity during LS2; and the
programme for a common ATLAS/CMS CO2 cooling pilot facility for
Phase II is expected to be launched soon.
A careful discussion about the optimal project timeline is highly
recommended and quite urgent in order to organize the work and
ensure that a service of the highest possible quality is delivered to
LHCb.
In any case, it is important that the required activities towards the
definition of the P&ID start immediately. Please note that, based on
our present experience, the time between completion of the P&ID and
completion of the plant commissioning must be estimated in excess
of 2 years.
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PH-DT / LHCb WP agreement
The PH-DT contribution will be detailed in a WP agreement with LHCb, that
will list the PH-DT deliverables and allocated resources for the whole duration
of the project.
The need of support of LHC-b funded students or associates will also be
evaluated and discussed for inclusion in this document.
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