Fresca 2 cryostat Progress on cryostat design and

Fresca 2 cryostat Progress on cryostat design and schedule A. Vande Craen, 11/07/2018 17 th monthly meeting on the upgrade of building 163 11/07/2018 1

General • WUST team will be at CERN 12 and 13 of July • • Cryostat functional specification being updated • • • General Technical meeting Meeting with magnet persons Meeting with Users To be checked with user To be checked with WUST Seismic analysis (agreement with HSE) • • • Based on CERN risk analysis (to be validated by project) CERN decides seismic analysis mandatory HSE gives calculation procedures to apply 11/07/2018 2

Integration • CDS interfaces drawing ready • • • Discussed with CRG Adjustments to be done All interfaces in their final angular positions • • Tolerances to be clarified with users Integration 3 D model available for CERN validation 11/07/2018 3

Design - Updates since last meeting (20/06) • • Decision taken to not use LN 2 neck thermalization Heater added on warm surface to avoid condensation (400 W) Transport restraints being studied (for horizontal transport) Plenty of minor things, design in progress Outer cryostat Magnet insert 11/07/2018 Inner helium vessel Inner thermal shield 4

Magnet support • • • +/- 3 mm freedom in horizontal plane Resistance to horizontal forces (seismic acceleration) Freedom for vertical adjustment of the magnet (position and angle) 11/07/2018 5

Blocking device • Optimization for heat loads: no condensation after 30 min, with large margin (not showed) • • • Elastic deformation and torque distribution Elastic deformation calculated, remaining allowed sample displacement to be dispatched • • • Convection neglected Radiation + Conduction considered Sample insert tolerances Locking system tolerances Magnet measurement (last week) showed need for position and angular tuning of the blocking system during assembly Sample holder Inner He. V Inner VV Magnet lock Bottom lock Optimized G 10 element for heat load reduction 11/07/2018 Top lock Magnet 6

Procurement Schedule • Present schedule • • • IT : End July 2018 Contract : Mid-October 2018 Delivery : Mid-July 2019 • Being rescheduled following reorganization of design team and additional design workload identified • New calendar will available after Collaboration meeting at CERN end of the week 11/07/2018 7