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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 PowerPoint PPT Presentation


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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. 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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Atlas cern

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

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


Feature of atlas central solenoid

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


Atlas cern

Composite structure formed by

Micro-alloying and precipitation

Ni --> High

0.1%

0.5%

Al3Ni: Contributes as structural component

Pure-Al:Keep low resistivity


Progress in high strength al stabilizer

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


Progress of atlas central solenoid

Progress of ATLAS Central Solenoid

@ Toshiba(1999)

Test @ Toshiba(2000-12)

Arrive at CERN(2001-9)

Maiani所長らと


Assembly into lar cryostat

Assembly into LAr Cryostat

Common Cryostat with LAr Calorimeter


Assembly into lar calorimeter

Assembly into LAr Calorimeter

Alignment

Coil Position<1mm


Installation and on surface test

Installation and On-surface Test

Extension Chimney

Proximity Cryogenics

Bulkhead

Main Chimney

Solenoid


Atlas cern

Cooling combined with Lar Calorimeter

6/7

Start Cooling Solenoid

6/23

Cooling complete


Cooling characteristics of atlas cs

Cooling Characteristics of ATLAS CS

Technical problem

in Refrigerator

Temperature(k)

LHe filled/boosted


Performance test

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


Quench protection with pure al strips

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


Atlas cern

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


Effect of pure al strips and protection heaters at 6ka

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.


Peak temperature after quench

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


Radiation thickness of various solenoids

Radiation Thickness of Various Solenoids


Atlas cern

Status at ATLAS site (Pit -1)


Conclusions

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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