BNL FNAL LBNL SLAC Magnet Systems Summary Highlights
BNL - FNAL - LBNL - SLAC Magnet Systems Summary Highlights from the parallel sessions Gian. Luca Sabbi LARP Collaboration Meeting 14 FNAL, April 26, 2010 CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
LARP Magnet Development Chart Completed • Length scale-up • High field • Accelerator features CM 14, 4/26/2010 Magnet Systems Status and Plans Achieved 200 T/m 1 st test 4/2010 Gian. Luca Sabbi
TQ Stress Limits Study Calculated peak stresses in TQS 03 c TQS 03 (LARP): • TQS 03 a: 120 MPa at pole, 93% SSL • TQS 03 b: 160 MPa at pole, 91% SSL • TQS 03 c: 200 MPa at pole, 88% SSL TQM MIRROR FNAL core program Measured warm stress (MPa) Air Gap (mils) Predicted Cold stress (MPa) TQM 01 100 4 90 TQMO 2 100 6 110 TQM 03 a 100 5 100 TQMO 3 b 105 8 145 TQM 03 c 135 10 185 260 MPa @ 4. 5 K 255 MPa @ SSL • Peak stresses are considerably higher • Some indication of (stress driven) instability in TQM (not in TQS) • Need some clarification and systematic comparison of results CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
LQ Plan 2010 -11 CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
LQ Goals 2010 -11 • Fully reproduce performance of the short models Ø Higher gradient Ø Fast training • Systematic analysis of coil length issues Ø Reaction process Ø Coil strain state after reaction • Structure optimization Ø One-side loading with 4 m keys/bladders • Other R&D topics Ø Protection heater design optimization Ø Insulation techniques for production Ø Coil size and reproducibility Some further discussion and prioritizationi is needed CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
HQ Plan 2010 -11 CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
HQ Next Steps • One-meter model optimization: Ø Pre-load, alignment, quench protection and thermal studies Ø Cored cables to control dynamic effects Ø Structure optimization for production and accelerator integration • Two-meter extension: field quality & comparison with Nb. Ti models Radial bladders/keys Cooling channels Laminated collar Pressure vessel/end terminations CM 14, 4/26/2010 Support/alignment fiducials Magnet Systems Status and Plans Gian. Luca Sabbi
HQ Discussion Topics Conductor • • HQ 01 a includes 2 coils with 54/61 strand 2 coils with 108/127 – we expect the 108/127 strand remain stable at 1. 9 K but there also speculations that the 54/61 strand may remain stable as well. Cable with a core may require that we slightly reduce the strand diameter Coils • • • The ability of coils to maintain a short-sample performance of 88 % with a pre-stress approaching 200 MPa has increased the window of opportunity in Nb 3 Sn magnet design. Axial gaps within the coil island introduces a degree of uncertainty that needs to be re-examine The relation between the coils OD and the surrounding pads id needs to be better understood if we want to get reliable strain measurements free of bending strain. Assembly and structure • Should we replace the 4 way alignment keys and Aluminum “collars” with more traditional collars that are aligned to the outer layer? CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
HQ Discussion Topics Assembly and structure: • • Should new collars maintain the functionality of the existing bolts between alignment keys and be used for assembly and not pre-stress? How critical are the end-plates and axial rods ? Is it time for a new structure? R&D will be required if we want to replace existing bladders with a more robust hydraulic system. Testing: • • The magnet OD (570 mm) requires upgrades at some of the test facilities By the end of 2010 we shall have 12 coils that may require as many as 6 tests. Between the test facilities at LBNL/FNAL and CERN we should be able to carry out the tests but the test facilities, especially at FNAL, are going to be very busy. HQ 2 models: • What is the minimum length require to demonstrate that all accelerator features, especially field quality, have been incorporated in the design? CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
Conductor Inventory CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
Cable Production and R&D Stable and consistent cable production: TQ (30 UL, 65 m each); LQ (15 UL. 200 m each); LR (3 UL, 200 m each); HQ (10 UL, 100 m each) Production so far has followed a 2 -step process: Ø First pass cable followed by anneal and re-roll Next R&D steps: Ø Ti-doped RRP wire (to qualify for purchase by LARP) Ø One-pass cable w/pre-annealed wire (lower cost, SS core) Ø Addition of a SS or glass core (control of dynamic effects) • R&D cables will be tested in HQ-1 coils • Best results to be incorporated in HQ-2 coils CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
6 -meter scale-up Goal: demonstrate full length magnet performance in support of the final IR design and construction project • Focus on 120 mm (HQ) design vs. 90 mm (LQ) or racetrack (LR) • Winding at FNAL or BNL; Reaction/potting at FNAL; test at BNL • In the meantime, upgrade BNL reaction/potting infrastructure for 8 m • Maintains one coil production line available while developing the infrastructure needed for the project • First assembled in a single-coil (mirror) configuration, and later on in a 4 -coil quadrupole configuration CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
CERN (Eu. CARD) Program and Collaboration CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
CERN (Eu. CARD) Program and Collaboration CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
From R&D to Construction (Revised) • No overlap between R&D and construction phases • Technology decision (2013) based on LQ, HQ 1 and HQ 2 models • Project start (2014) decision also includes results of HQ 6 models CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
Magnet Systems Mid-Year Budget Update (Version 6, 4/24/2010) Mid-year Budget Update CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
Summary • Significant technical progress during the last 6 months: LQ 200 T/m milestone and further optimization, robust performance in TQ, and completion of the first HQ • The near term magnet R&D plan (2010 -2012) is well aligned with a technology decision in 2013 Ø Systematic testing of LARP Nb 3 Sn models and CERN Nb. Ti models with same specs will provide direct technology comparison and qualification • The medium term magnet R&D plan (2012 -2014) is being formulated with the goal of minimizing the technical and schedule risk for construction Ø Extension of the HQ design to 6 m length appears to be the most effective strategy CM 14, 4/26/2010 Magnet Systems Status and Plans Gian. Luca Sabbi
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