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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

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

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


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

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

@ Toshiba(1999)

Test @ Toshiba(2000-12)

Arrive at CERN(2001-9)

Maiani所長らと


Assembly into LAr Cryostat

Common Cryostat with LAr Calorimeter


Assembly into LAr Calorimeter

Alignment

Coil Position<1mm


Installation and On-surface Test

Extension Chimney

Proximity Cryogenics

Bulkhead

Main Chimney

Solenoid


Cooling combined with Lar Calorimeter

6/7

Start Cooling Solenoid

6/23

Cooling complete


Cooling Characteristics of ATLAS CS

Technical problem

in Refrigerator

Temperature(k)

LHe filled/boosted


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

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


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

Adjusted value for well simulation.

Ideally (no thermal resistance b/w winding and pure al strips) 0.1.


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


Status at ATLAS site (Pit -1)


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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