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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 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

slide4

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

slide10

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

slide14

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

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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