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ATLAS 超伝導ソレノイドの CERN での組み込みと励磁試験の成功

ATLAS 超伝導ソレノイドの CERN での組み込みと励磁試験の成功. 磁場＋粒子透過性能の 追求 組み込みと地上試験結果 まとめ. KEK, 東芝 , CERN 山本　明、槙田康博、河合正徳、近藤良也、土井義城、春山富義、近藤敬比古、水牧祥一、 R. Ruber, F. Haug. ATLAS Central Solenoid. Central Solenoid. B c = 2T (I = 7600A) 5.3m × f 2.3m × 45mm wall thickness = 0.66 X 0 E/M = 7.1 kJ/kg.

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ATLAS 超伝導ソレノイドの CERN での組み込みと励磁試験の成功

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  1. ATLAS超伝導ソレノイドのCERNでの組み込みと励磁試験の成功ATLAS超伝導ソレノイドのCERNでの組み込みと励磁試験の成功 磁場＋粒子透過性能の 追求 組み込みと地上試験結果 まとめ KEK, 東芝, CERN 山本　明、槙田康博、河合正徳、近藤良也、土井義城、春山富義、近藤敬比古、水牧祥一、R. Ruber, F. Haug

  2. ATLAS Central Solenoid Central Solenoid Bc = 2T (I = 7600A) 5.3m × f2.3m × 45mm wall thickness = 0.66 X0 E/M = 7.1 kJ/kg To be as transparent as possible: • High strength Al stabilized S.C. • Pure-Al strip quench protection, • Common Cryostat with LAr-CAL

  3. Feature of ATLAS Central Solenoid 30 x 4.25 mm2 Pure Al-stripquench propagator High-Strength Al-stabilized superconductor Y.S. = > 100 MPa RRR > 500 Ic at 5T, 4.2K = 22 kA

  4. Composite structure formed by Micro-alloying and precipitation Ni --> High 0.1% 0.5% Al3Ni: Contributes as structural component Pure-Al:Keep low resistivity

  5. Progress in High-Strength Al Stabilizer 67 < 2/3 < ６７ ４５ 高強度線による設計 従来の設計 20% cold work Reinforcement >3 times Material saved to be 2/3 Stress in the Coil

  6. Progress of ATLAS Central Solenoid @ Toshiba（1999） Test @ Toshiba（2000-12） Arrive at CERN（2001-9） Maiani所長らと

  7. Assembly into LAr Cryostat Common Cryostat with LAr Calorimeter

  8. Assembly into LAr Calorimeter Alignment Coil Position＜1mm

  9. Installation and On-surface Test Extension Chimney Proximity Cryogenics Bulkhead Main Chimney Solenoid

  10. Cooling combined with Lar Calorimeter 6/7 Start Cooling Solenoid 6/23 Cooling complete

  11. Cooling Characteristics of ATLAS CS Technical problem in Refrigerator Temperature（ｋ） LHe filled/boosted

  12. Performance Test • Maximum Excitation Test up to 8.14 kA • training quenches at 7.9 and 8.1 kA (> Iop = 7.6 kA • heater initiated quench at 4, 6 and 7.6 kA • chimney heater initiated quench at 6 kA Imax = 8.14 kA • Additional testing after test @ Toshiba: • thermal cycling • transportation • assembly work at CERN Iop = 7.6 kA

  13. Quench Protection with pure-Al strips w/o Energy extraction Homogenized energy dump into the whole coil コイル全体 kz=270W/m・K, Kz/kf=0.1 Test with pure-Al strips and quench protection heater

  14. Concept of Quench Protection by using Pure-Al Strips Temperature Uniformity VS Axial Coil Thermal Conductivity Min. Temp Vf Vz Quench Origin Max. Temp. =(Vz/Vf)2 Quench Propagation Larger : Homogenized Energy Dump

  15. Effect of Pure AL Strips and Protection Heaters at 6kA Adjusted value for well simulation. Ideally （no thermal resistance b/w winding and pure al strips) 0.1.

  16. V-tap Thermometer Heater centre edge Peak Temperature after Quench (w/o QPHT) (with QPHT) T-peak = 118 K @ 8.1 kA at chimney end with QPHT

  17. Radiation Thickness of Various Solenoids

  18. Status at ATLAS site (Pit -1)

  19. Conclusions • ATLASCentral Solenoid successfully assembledinto a common cryostat with Liquid Argon Calorimeter, • Safe operation in cooling and excitations up to107 %of Nominal Current: • maximum current 8.14 kA @nominal current 7.6 kA • Quench safety verified • With quench test with T-peak = < 120 K • Installation at pit to be completed by autumn2005 • Excitation test with iron flux-return yoke to be in early2006.

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