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HQ Status and Plans

HQ Status and Plans. G. Sabbi High Luminosity LHC Annual Meeting Daresbury , UK, November 11-14, 2013. HQ Program Status/Plans. HQ02: test second-generation HQ coils including provisions for coil expansion during reaction p rovisions for improved electrical integrity

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HQ Status and Plans

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  1. HQ Status and Plans G. Sabbi High Luminosity LHC Annual Meeting Daresbury, UK, November 11-14, 2013

  2. HQ Program Status/Plans • HQ02: test second-generation HQ coils including • provisions for coil expansion during reaction • provisions for improved electrical integrity • cored cables for suppression of eddy current effects • HQ03 model using uniform, final design and process • Realistic field quality & performance reference for HL-LHC • Detailed discussion of HQ program status and plans took place in July • The resulting summary document is available at: https://plone.uslarp.org/MagnetRD/ModelQuadrupoles/HQ/Meetings/2013/2013-07-30/HQ-plans-2.docx • In the next slides, we review and update some of the key points

  3. HQ02a-2 Test Summary: results vs. plan • Achieve highest possible current at 2.2 K and 4.5K with current configuration • First quench above 15kA: no performance loss after thermal cycle • Slow training at 2.2K above 15kA, several coils/locations but all in high field (pole) area • Clear signs of insufficient pre-load, as expected • Fall backs at moderate miits, with slow retraining • No performance loss at 4.5K, achieving 98% of SSL at 4.5K and enabling detailed performance studies in many areas: • ramp rate, quench velocities, performance degradation limits due to stress, high miits etc. • Perform additional magnetic measurements and heater studies • Full characterization completed • Incorporate acoustic sensor and quench antenna for additional information on quench development -- Completed • Resolve inductance questions -- Problem tracked to 15kA header

  4. HQ02a2 Test Summary: results vs. plan (2) • Continue quench protection studies, use temperature that allows highest fraction of SSL – 4.5K • Establish miitsbudget (ok if it detrains but we want to go back within 5% of maximum achieved fraction of SSL) • Not possible due to slow training and easy detraining, but 98% SSL allowed to establish no degradation up to 16 miits • Complete quench integral study and add small (2.5-5 mOhm) dump resistor • Completed no dump and 5 m-Ohm, results are close, 2.5 mOhm must be in between • No high miits quenches directly aimed at establishing performance degradation in this test • Added: studies in preparation for CLIQ test • More details on AC losses, comparison with HQ01e

  5. HQ02b assembly plan • Option 1: perform a complete disassembly of HQ02a • Attempt to understand and fix faulty strain gauges • Reassemble with higher pre-load (level to be discussed) and/or coil configuration changes (update: no coil changes needed) • Option 2: Increase the pre-load • Currently leaning toward option 2: there is no need to exchange coils, and strain gauge study could be performed separately • However, it means no reliable coil stress measurements in HQ02b • It would also prevent from removing the warm bore guide blocks •  We will have a dedicated meeting in 2-3 weeks to discuss • Future HQ02 assembly should include warm magnetic measurements • A plan is in place, with FNAL support • Include correction of high field errors with magnetic shims • Discuss limitations due to presence of guide blocks in option 2

  6. HQ02b Test at CERN • Perform 1.9K measurements up to maximum achievable current • Establish performance improvements/degradation with higher pre-load • Robustness studies: large number of cycles, full accelerator cycle • Incorporate/characterize new instrumentation (QA, acoustics etc.) • Assess performance of CLIQ system for magnet protection • Establish safe miitsbudget as was planned for HQ02a-2 • Extend quench protection studies within safe miits budget • Quench integral, heater tests, CLIQ etc. • Perform study of degradation vs. MIITS (to be discussed) • Perform magnetic measurements (to be discussed) • Timeline: with simple pre-load increase, magnet could be at CERNin (late) February; one additional month for full reassembly. • Discussion on planning and organization for HQ02b test is starting: test plan/priorities, definition of key roles and responsibilities (LARP/CERN)

  7. HQ03 Plan • Coil fabrication is progressing well, expect to have coils ready following the test of HQ02b at CERN • However, coil strain gauges are an issue: we need to understand and fix reason for failures in HQ02 (and LQS03) • This may require dedicated tests/analysis and may cause delays • Option 2 assembly for HQ02b means no magnet feedback before HQ03 • Also, we want to implement a QXF-style heater design in coil 26 (spare) and possibly in coil 25 (last coil of nominal set) – this is also on the critical path • Planning to implement magnetic shims for correction of high current harmonics (based on warm magnetic measurements) and magnetic shims for correction of persistent currents (based on calculations and HQ02 measurements) • Need to decide on test location (FNAL or CERN) • Discuss status of VMTF upgrade for full current at 1.9K • Implement upgrades in the magnetic measurement system (both CERN/ and FNAL)

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