EuCARD WP 7 – High Field Magnets EuCARD WP 7 – High Field Magnets Task 2 – Support studies Status report after M6 EuCARD HFM collaboration meeting – CERN Sept Dr. Jaroslaw Polinski, Prof. Maciej Chorowski Faculty of Mechanical and Power Engineering

Outline WP 7.2 Support Studies objectives – description of the work Planning – global and 1st year plan Progresses Conclusions

Task 7.2 – Support Studies Sub–task Radiation resistance certification –Objectives: Magnets in accelerators like the upgraded LHC and neutrino factories be subjected to very high radiation doses. The electrical insulation employed on the coils need to be resistant to this radiation. A certification program for the radiation resistance is needed in parallel to the modelling efforts for such magnets –Need to be done Determination of radiation types, doses and energy Determination of irradiated sample tests scope Selection of the Institute capable of the irradiation Insulation samples preparation Sample irradiation Irradiated sample tests

Task 7.2 – Support Studies Sub–task Thermal models and design. –Objectives: The same radiation is also depositing heat in the coils. The heat removal from the coils needs to be modelled. These models have to be supported with measurements. A thermal design of the dipole model coil can then be made. –Need to be done: Selection of the insulation materials Preparation of the insulation materials sample Thermal characterization of the insulation materials Coil samples tests Thermal model of the coil Thermal model of the Nb3Sn dipole magnet

Task st year plan

Task Progress Sub–task Radiation resistance certification –Determination of radiation types, doses and energy – still to be specified!!! radiation type as gamma (photons – about 85%) and neutrons (7%) are preliminary specified doses and radiation energy information are still missing !!! –present LHC – 3.5MGy for 75fb -1 luminosity –I-phase LHC upgrade – up to 5 MGy/100fb -1 –II-phase (Nb3Sn) LHC upgrade - ?

Task Progress Sub–task Radiation resistance certification –Determination of irradiated sample tests scope – still to be specified!!! mechanical properties – compressive strength (only?) –compression values - to be specified –number and design o samples - to be specified –RAL is doing the mechanical test according to: »ASTM D5528: „Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites” »ASTM D2344 : „Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates” electrical properties – insulating strength (only?) – 0-5kV range is preliminary specified –number and design o samples - to be specified –RAL is doing the electrical breakdown test according to: BS7831 – „Test procedure for thermal endurance of insulating varnishes. Electric strength method” other properties?

Task Progress Sub–task Radiation resistance certification –Selection of the Institute capable of the irradiation The Andrzej Sultan Institute for Nuclear Studies (IPJ) in Poland still upholds they possibility to perform the samples irradiation. IPJ is capable to irradiation with: –Thermal neutrons – meV –Fast neutrons – up to 14 MeV –Gamma – photon and from isotopes –Electrons – up to 15MeV IPJ call for radiation specification to final possibility confirmation –Irradiated sample test set-up preparation PWR Faculty of Mechanical Engineering is capable to perform the irradiated samples mechanical tests – the detail tests specification is needed

Task 7.2 – Progress Sub–task Thermal models and design –Thermal model needs: determination of the magnet design (Sub-task 7.3) determination of the insulation material thermal properties of insulations thermal tests of the coil model determination of the magnet structure material thermal contact resistance between coil insulation and magnet structure material (SS, Al, Cu,... ) person/team experienced in HeII modeling proper numerical code to HeII modeling

Task 7.2 – Progress Sub–task Thermal models and design –determination of the insulation material In NED project RAL proposed S-glass tape and DGEBF/DETDA epoxy resin for SC cable conventional insulation, which is still „the best” candidate for Nb3Sn magnet cable insulation

Task 7.2 – Progress Sub–task Thermal models and design –thermal properties of insulation material thermal conductivity and Kapitza resistance of insulation (in He IIp conditions) –experimental data already exist form NED project thermal conductivity and heat transfer coefficient (in He I conditions) –thermal conduction – with cryocooler setups, test specification to be determined –heat transfer coefficient – test method to be determined

Task 7.2 – Progress Sub–task Thermal models and design –thermal tests of the coil model stack method - seems to be the most suitable dummy conductor - CuNi dummy cable should be gained: –from CERN – it is not possible to produce short (up to 10m) series –from KEK - ? T sensor installation method – CERNOX T sensors can’t be backed over 200 o C: –the sensors should be installed after sample heat treatment (state-of-art) or –the sample shouldn’t be heat treated New HeIIp cryostat on PWR –commissioning – early 2010 –test vessel dimension: 400mm ID, 500 mm high

Task 7.2 – Progress Sub–task Thermal models and design –thermal contact resistance between coil insulation and magnet structure material (SS, Al, Cu,... ) special (mechanical) test insert have to be designed magnet structure materials have to be defined –thermal model of the magnet coil and whole dipole computer code allows HeII condition modeling have to be find –CAS3M ? (or some open source program) –experienced person should be involved –project should consider to create some „HeII heat transfer modeling school” to create HeII modeling team

Task 7.2 – Progress Sub–task Thermal models and design –30th of Sept – 1st of Oct – „Mini-Workshop on Thermal Modeling and Thermal Experiments for Accelerator Magnets” will be held at CERN –the EuCARD WP7 heat transfer measurement program will be arrange next days after

Conclusions Task Time period [in months] Status Action to be taken to start/continue/finish Determination of radiation types and doses 0-3Under way Specification of the radiation type, doses and energy Determination of irradiated sample tests scope 0-3Under way Specification of the necessary after irradiation tests Selection of the Institute capable of the irradiation 4-6 Preliminary done Specification of the radiation type and doses Irradiated sample test set-up preparation 6-12To be done Specification of the necessary after irradiation tests Sub-task 2.1: Radiation resistance certification

Conclusions Task Time period [in months} Status Action to be taken to start/continue/finish Selection of the insulation materials 0-3 Preliminary done - Preparation of the insulation materials sample 4-9To be done Specification of the heat transfer test scope Thermal characterization of the insulation materials 7-18To be done Specification of the heat transfer test scope Coil samples preparation 10-15To be done Specification of the coil (stack) sample design Thermal model of the HFM coil 10-24To be done Selection of the modeling tool, finding the experienced person (team), defining the magnet design Sub-task 2.2: Thermal model and design