Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 1/7 Superconducting Magnets and Laboratories: Instrumentation for Magnetic Measurements M Buzio, L Walckiers on behalf of TE/MSC/MM staff Superconducting Magnets and Laboratories: Instrumentation for Magnetic Measurements M Buzio, L Walckiers on behalf of TE/MSC/MM staff Contents 1.LHC Spares 2.Support to LHC Operation 3.Support to LHC Operation 4.LHC upgrade Phase I 5.Magnet R&D – High Field Magnets 6.Magnet R&D – Fast-Cycled Magnets

Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 2/7 Magnetic Instrumentation for LHC Spares Demands Capability to measure spares and repaired magnets to the same standard as the series Instrumentation -All necessary equipment in working order (exception: large aperture magnets) -Spares available: sufficient for long coil shafts and rotating units, integrators, moles, etc … Long-term issues: hardware -Maintenance and calibration: key staff retired (or retiring soon), transmission of know-how to be ensured -Coil manufacturing workshop: winding machines to be repaired, specialized component suppliers (glue, wires …) to be renewed -Single Stretched Wire (calibration reference): three units in operation, but hardware starts to fail and some direct replacements out of stock (also, excellent support from Fermilab is nowadays much reduced)  Need to re-develop internally for the long term Long-term issues: software -Legacy platform = VME + LabView MMP on Sun workstations: stable system, support calls answered efficiently by EN/ICE, but platform being phased out -SMA database for coil calibration factors + raw/treated cold harmonic data discontinued  all processing/file transfer dome manually (not a problem for infrequent measurements) Support needed -EN/ICE/MTA: spare workstations/hard disks; MMP maintenance, backups, networking -BE/ABP/SU: laser tracker operation/maintenance; cooperation for geometry (magnetic axis) measurements -TE/MSC: coordination on relocation/operation of warm measurement systems (polarity checkers, DIMM/QIMM moles)

Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 3/7 Magnetic Instrumentation in Support to LHC Operation Demands (see E. Todesco’s talk) -Fill in the magnetic model of LHC (FIDEL) -Validate the model on SM18 test benches (Tracking Tests) -Long term: update FIDEL in response to evolution of power cycles, operation modes etc … Instrumentation Standard instrument park + next-generation field acquisition platform (FAME – FAst Measurement Equipment) Designed to ensure: -long-term maintainability (PXI platform, modern electronic components) -enhanced performance (200×bandwidth, 100×S/N over VME integrators) -flexibility in a prototyping setting (C++ software running on Windows/Linux PC) Planned/under way developments -Fast Digital Integrators (FDI): firmware revision for more flexible use (internal trigger generation + interrupt handling) under way; finalization of hardware to achieve max. performance -FAME coil shafts: one full SSS system + one spare MB system; mechanism for longitudinal adaptation under study (essential for flexibility e.g. for correctors) -FFMM C++ framework: interfaces with HW/SW components (e.g. SM18 power supplies and LSA control system), fault detection, scripting, user interface Support needed -Integrators: partially supported by external collaboration with Università del Sannio (Italy) + Technology Transfer agreement with commercial partner (Metrolab, Geneva) -FFMM software: fully supported by Università del Sannio -Data storage: standard CERN Oracle support for storage of calibration data, raw and treated test results.  Detailed data formats and interfaces to be finalized in accord with all potential users.

Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 4/7 FAME (FAst Measurement System) = Adapted long coil shaft + Mobile Rotating Unit + + PXI Fast Digital Integrators (~25 prototypes operational) FFMM C++ software (prototype version 3.0 deployed) Status: 1 full system for MB operational in SM18 (some tests pending). 8 Hz rotation speed demonstrated (much higher bandwidth possible with interpolation) Components can be reused and adapted for different non-SC projects: - Harmonic DC/fast-cycled measurements for Linac4 PMQs and EMQs - Upgrade of magnetic material testing equipment (permeameter) - SSW upgrade (long-term maintainability) - 3D Hall probe scanner.

Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 5/7 Magnetic Instrumentation for LHC Upgrade Phase I Demands Warm/cold magnetic testing & quench detection of Ø120~180(?) mm NbTi magnets (1~2 short models + 23 correctors + 24 series cryomagnets) Instrumentation Single Stretched Wire: adequate for integral strength, magnetic axis and field direction. Existing rotating coil systems are not adequate for accurate harmonic measurements (ideally harmonic coil size  ⅔ aperture size) Planned R&D -Large-diameter quadrupole compensated coil arrays (long shafts and/or mole with optical tracking): mechanical stiffness and weight issues, calibration procedure (present reference magnet aperture too small) -Adaptation of mechanical and electronic components to harmonic coils system for large diameters, horizontal or vertical cryostats (short models) -Collaboration to development of suitable anticryostats -Fabrication of coils/shafts for modular quench antennas; improvement of the reliability of coils at cryogenic temperature (winding and curing procedure, quality of glue, dedicated thermal cycling testing) -Adaptation of acquisition system for fixed coil system (string test) Support needed -BE/ABP/SU: coordination on geometry tests + data analysis and storage. -All end users: coordination on design of quench antennas (size and sensitivity of coils, geometry, compensation) Overlap With Magnet R&D

Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 6/7 Magnetic Instrumentation for Magnet R&D – High field magnets Demands Warm/cold magnetic testing & quench detection of dipole and quadrupole short models and prototypes Support to cable testing facility: search coils, electronics for data acquisition … (useful for any SC-related R&D) Instrumentation Existing instrumentation may or may not be adequate to the task (mainly depends on: magnet length, Ø aperture, accuracy needed). R&D issues -Anticryostats -Quench antennas -Adapted coil shafts/moles -Vertical cryostat systems Support needed -To be told in advance of geometrical/field constraints … (long lead times for high precision coil and shaft components) Overlap with R&D for Upgrade Phase I

Instrumentation for Magnetic Measurements” Review of Superconductors and Magnet Laboratories, May 2009 Page 7/7 Magnetic Instrumentation for Magnet R&D – Fast-cycled magnets Demands -Warm/cold magnetic testing and quench detection of short models and prototypes (up to 2 T/s, 4 T) -Magnetic properties of iron yoke samples (magnetization curve + hysteresis and AC losses) Instrumentation Standard magnetic measurements based on fixed coils. Existing systems (routinely used on normal magnets) require wide apertures  likely to be inadequate. R&D issues -Suitably dimensioned coils and/or moles and/or double stretched wire systems Topics overlapping other SC/NC magnet programs: -Adapt acquisition to high-precision pulsed mode operation (   synergy with Linac 4) -High bandwidth measurements of eddy current effects (   synergy with Linac4, PS, CNAO) -Integral measurement in strongly curved magnets e.g. multiple-coil fluxmeter (  R&D done for CNAO) -Flexible control of standard split-coil permeameter with FDI/FFMM (   material properties routinely demanded by many clients e.g. NC magnets, PS B-train, LHC experiments, CLIC, CNAO, MedAustron, ITER …) Support needed -To be told in advance of geometrical/field boundary conditions …