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Transnational Access MagNet @CERN WP9b

Transnational Access MagNet @CERN WP9b. Marta Bajko CERN TE-MSC TF. The location of MagNet @ CERN. located in point 18 (is building nr.2173 known at CERN as : SM18). Transnational Access.... done?. Search on the CERN PHOTO LAB: “SM18”. Visits with highly qualified guides.

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Transnational Access MagNet @CERN WP9b

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  1. Transnational AccessMagNet@CERNWP9b Marta Bajko CERN TE-MSC TF

  2. The location of MagNet @ CERN • located in point 18 (is building nr.2173 known at CERN as : SM18)

  3. Transnational Access....done? Search on the CERN PHOTO LAB: “SM18” Visits with highly qualified guides

  4. Transnational Access:MagNet …..SM18is a unique facility at CERN for testing magnets and instrumentation at very low temperature (lowest being 1.9 K) and up to high currents (20 kA). It is equipped with 10 benches for testing superconducting magnets in horizontal position and with 2 vertical cryostats.

  5. WP09 Objectives ….. to carry out: tests of superconducting magnets and instrumentation FReSCa2 structure in LN2 THRESHOLD of detection and protection: 50 mV, 10 ms Indicates a quench onset in: which is composed as following: the signals therefore we can only conclude that: The quench onset is in-between Vtaps 2 and 3 . Not in the coil and not in the splices. It is located in the NbTi cable linking the two coils. Heat is propagating from this portion of cable to Splice 2 and Splice 3.

  6. WP09 Objectives ….. to carry out: tests for superconducting magnets and instrumentation ….. Axial strain measurement on a magnet structure based on Optical Fiber measurements Temperature measurement with Optical Fiber

  7. WP09 Objectives …..CERN will offer infrastructure, equipment ( including handling) …..CERN will offer infrastructure, equipment ( including handling) and expert support…… …..CERN will offer infrastructure

  8. Infrastructure: SM18 layout Vertical test benches for 1.9-20 K operation Horizontal test benches for 1.9 K or 4.2 K operation Zone dedicated to the RF cavity activities for 1.9 K or 4.2 K operation Vertical test installations for 77 K operation

  9. Infrastructure: horizontal test benches They are grouped in set of 2 benches forming a cluster. Each cluster is equipped by a set of equipment: PC, DAQ Powering capacity: 4 x 14 kA/16V 1 x 17 kA/60 V Horizontal benches Magnet weight: 25 tonnes Operation temperature: 1. 9K Max. current in the magnet: 13 kA Max. pressure in case of quench : 20 bars Max. test voltage : 3 kV The cooling is done in 3 steps: 300-80 K with LN2 cooled He gas, from 80-4.2 K with He gas and LHeand from 4.2-1.9 K by pumping the LHe of the heat exchanger. Cooling capacity: 6 kW power plant sheared by RF and Magnets 25 g/s total pumping capacity Magnet need to have its own cryostat!! 1 Cluster equipped with Energy Extraction system up to 80 mOHM Is heavy and expensive to adapt them!! From the initially built 12 horizontal benches 10 are operational today.

  10. Infrastructure: vertical cryostats or feed box 20 kA power converter Vertical benches ( cryostats) Magnet weight: few kg- 15 tonnes Operation temperature: 4.2 K and 1. 9K Max. current in the magnet: 20 kA/24 V Max. pressure in case of quench: 3 bars Max. test voltage : 1 kV The cooling is done with He gas and LHe. From 4.2-1.9 K by pumping the LHe of the heat exchanger of the cryostat (when we have the lambda plate).48 h cooling time! 20 kA water cooled cables Valve box Control Room Magnet to be tested without its own cryostat!! Pumping line Cryogenic rack CryogenicControl DAQ Energy Extraction system 5- 60 mOHM Cold buffer HFM cryostat Supercritical He Feed Box The station designed for “Sc Fast Cycled Magnet, and “Sc Link” 10 kA power converter Magnet or Sc Link need to have its own cryostat!!

  11. T1r T1 Infrastructure: cryostats for 77 K T2 Magnet Flushing Station recuperated from LHC Main Magnet series tests activity Vertical benches (cryostats) for 77 K Magnet weight: 10 tonnes Operation temperature: 77 K Max. current in the magnet: 0 kA Max. pressure in the cryostat : 3 bars Outer diameter: 1.1 m Length: 4 m The cooling is done with mixture of N2 gas and Liquid N2. Ex.witha DT< 100 K over 2 m and 10 tons cooling was done to 77 K in 2 days . Transfer lines Control Room Temporary placed in the parking area Cryostat borrowed from RF LN2 tank Variable Temperature Insert Cryogen Free Cryostat Diameter: 10 mm Height: 50 mm Where ΔT= T1-T2≤ 0.5 K T1r-T1≤ 0.1 K Magnet to be tested without its own cryostat!! No possibility for electrical powering !!!! In addition we are in the phase of procurement of a VTI ( 300 -4.2 K) cryostat equipped with a 0.5 W cryocoolerfor instrumentation test like Optical Fibre based sensors For small size instrumentation

  12. Our “jargon” with some numbers Quench detection thresholds …in the range of 50 mV and 10 ms verification time We use specific electronics developed for quench detection with differential signals. Splice resistance measurements …in the range of the nOhm… Energy Extraction with Dump resistor ….ms extraction time for energies up to 0.5 MJ Inductance measurements … also used for short detection AC losses …Specific dedicated equipment High Voltage test …in the range of the kV Quench heater powering …by discharge of capacitor benches Quench localization …with V taps or quench antennas… Strain measurement …with resistive gauges or with optical fibers… For operation …Temperature sensors up to 1.9 K Pressure gauges LHe level gauges LN2 level gauges Magnetic measurements …field quality, transfer functions… This is part of a qualification program for a magnet…. We do these measurements, we develop our equipment and we constantly work on the improvement with specialist across CERN in order to have the most reliable measurements done in the most efficient way.

  13. Safety for users The main hazards are linked to the use of cryogenics, high currents, high voltages, heavy loads, laser radiation, RF cavity radiation and a complex distribution of electricity and cryogenic fluids and gases. Link to the Sm18 test facility web page

  14. Modus Operandi for MagNet • Feasibility of the experiment with the existing equipment and within the • Proposed timeline • taking into account the CERN needsof the installations and • Giving them the highest priority • Scientific value of the potential result for the community • Synergy with R&D activity in the field of Superconductivity and in general accelerators the Approved experiments will have the occasion to profit of the installations for 2 unit access /year for instrumentation test, 8 unit access/ year for magnet test and 2 extra unit access/ year for additional magnetic measurements The budget from FP7 will be used to installations, dismantling, transport of heavy equipment for test and for travel expenses of users; for expenses related to the stay at CERN to prepare and carry out (with the collaboration of CERN experts), and analyse the test results; and for transport of material related to experiments at the facility. Link to the Sm18 test facility web page Selection Panel (with several experts in testing) will analysefrom potential users of the installations of MagNet the proposals

  15. Thanks for your attention Marta Bajko CERN

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