WP6: Cold Powering

Objectives

Task 6.1. Coordination and Communication

  • To define the global system taking inputs from different work-package (WP) tasks 

  • To coordinate and schedule WP tasks, to monitor work progress and inform the project management and WP participants 

  • To follow up the WP budget and use of resources 

  • To prepare internal and deliverable reports

Task 6.2. LHC Cryogenics: Cooling and Operation

  • To study different cooling options within the LHC cryogenic system 

  • To define cryogenic interfaces with the other system components 

  • To elaborate the optimized flow-scheme 

  • To define cryogenic requirements and components for operation and protection

Task 6.3. Electrical transfer and cryostats: thermo-electrical and mechanical models

  • To study the thermal and electrical performance of the superconducting components in steady state and in transient conditions 

  • To study and define requirements for quench protection of superconducting components 

  • To design a cryostat for the operation of the current leads

Task 6.4. Energy deposition and material studies

  • To calculate maps of energy deposition from collision debris and beam losses 

  • To calculate the induced radiation on the cold powering components 

  • To study the potential effect of radiation on advanced superconducting materials

Description of work

Task 6.1. Coordination and Communication

The activities of this task are for the WP coordinators [CERN, INFN] to oversee and co-ordinate the work of all the other tasks in the WP7, to ensure the consistency of the work according to the project plan and to coordinate the WP technical and scientific tasks with other tasks carried out within other work packages when relevant. The coordination duties also include the organization of WP internal steering meetings, the setting up of proper reviewing, the reporting to the project management and the distribution of the information within the WP as well as to the other work packages running in parallel. The task includes the coordination of the global cold powering system taking into account inputs from the different work packages and from parallel activities on the cold powering strictly related to LHC machine and carried over within separate working groups.

The task also covers the organization of and support to the meetings dedicated to the WP activity review and possible activity workshops or specialized working sessions, implying the attendance of invited participants from inside and outside the consortium.

Task 6.2. LHC Cryogenics: Cooling and Operation

The activities of this task are concentrated on the study of the cryogenic cooling to be adopted for the different electrical components of the cold powering system. The task covers a study on the availability and on the supply of the helium cryogen at appropriate temperature and pressure levels, and the definition of the requirements for control and operation. A study on space requirements and components integration in the LHC is also performed in collaboration with Task 6.1 and task 6.3.

CERN will lead this activity, which is strongly related to the LHC cryogenic system, and SOTON will participate in the work.

Task 6.3. Electrical transfer and cryostats: thermo-electrical and mechanical models

The task covers the study of the thermal and electrical performance of the multi-circuit superconducting long transfer line, cooled by supercritical helium, both in steady state and in transient conditions. Different types of advanced conductors are analyzed - MgB2, BSCCO 2223 and YBCO - as well as different types of coolants – liquid helium, supercritical helium in a variable temperature range and liquid nitrogen. The study of heat transfer in supercritical helium will be supported by experimental tests. The effect of the electrical insulation around the cables on the heat transfer is analyzed. Quench propagation in superconducting cable systems cooled by supercritical helium is studied with the final goal of identifying the requirements for the protection of long multi-circuit high-current cables. The aim is to propose quench protection and detection strategies to avoid any degradation. The study of the behaviour during restive transition includes the analysis of potential thermal and/or electrical interference between cables belonging to different circuits and incorporated in the same cryogenic envelope. Experimental work will be needed for the validation of the theoretical modelling. Modelling codes will be elaborated for the analysis of the thermo-electrical performance.

The task includes the conceptual design of a cryostat optimized for the operation of the current leads feeding via the superconducting transfer line the magnet system. SOTON will lead this activity, with contributions from CERN.

Task 6.4. Energy deposition and material studies

This task is focused on the study of the energy deposition on cryogenic components. The activity aims at the calculation of the maps of energy deposition from particle debris at the positions where the components of the cold powering system will be located. The goal is to study the potential impact on the superconducting components and the consequent requirements in terms of maximum operating temperature. The task also covers aspects of induced radiation to be taken into account for repair and/or maintenance interventions. Calculations of fluencies and energies of particles are also needed to study the potential effects on superconducting materials.

The effect of radiation on superconducting materials potentially used in the cold powering system (MgB2, YBCO and BSCCO 2223) is also studied. The task is coordinated by INFN Institute of Milano, with contributions from CERN.

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