ILC Main Linac Superconducting Quadrupole V. Kashikhin for Superconducting Magnet Team.
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Transcript of ILC Main Linac Superconducting Quadrupole V. Kashikhin for Superconducting Magnet Team.
ILC Main Linac Superconducting Quadrupole
V. Kashikhin for Superconducting Magnet Team
TILC09, Tsukuba April 16-21, 2009 2
Outline
• Split quadrupole issues • Quadrupole concept• Conductive cooling• Magnetic design• Installation and disassembly• Summary
TILC09, Tsukuba April 16-21, 2009 3
Split Quadrupole Concept Design Team
• Miao Yu- Cooling down analysis• Mauricio Lopes- Magnetic center shift• Yuri Orlov- 3D design and integration• Vladimir Kashikhin- Magnet concept
The Quadrupole concept was designed in short period of time by:
TILC09, Tsukuba April 16-21, 2009 4
Splittable Quadrupole Issues
Task from ILC Project Management: Look at the Split Quadrupole conceptual design to provide the quadrupole package installation and replacement outside of a very clean room. Main issues:
• Stable magnetic and mechanical design;• Effective conductive cooling;• Easy installation and disassembly;• Quadrupole+BPM rigid connection;• Magnetic axis stability;• Quench protection.
TILC09, Tsukuba April 16-21, 2009 5
ILC Quadrupole Specification
TILC09, Tsukuba April 16-21, 2009 6
Quadrupole Mechanical Concept
It was chosen the quadrupole design with racetrack coils which easy to split in vertical or horizontal direction.
TILC09, Tsukuba April 16-21, 2009 7
Quadrupole Fabrication• Qudrupole laminated yoke consists of two halfes;• Laminations stamped with accuracy 20 microns;• Long calibrated rods connect two thick side plates and laminations in the solid unit;• Two coils mounted in each half core.•There is an easy assess to provide accurate coil mounting relatively pole and provide the coil frame prestress;• The half units identical and exchangable;• All current leads should be heavily stabilized with extra copper material.
Split plane
Built and Tested Quadrupole Model 1
TILC09, Tsukuba April 16-21, 2009 8
Quadrupole Wiring SchemeQuadrupole consists of 4 coils.Each coil has 3 sections of NbTi superconductor: one is for quadrupole and two for vertical and horizontal dipoles.There is also heaters in each coil wound from a stainless steel wire.Quadrupole and dipole sections connected in quadrupole and dipole configuration as shown in figure.The connections easy to rearrange for split configuration
Split line
TILC09, Tsukuba April 16-21, 2009 9
Quadrupole Cooling-Down • The quadrupole will be cooled using conductive
cooling;• Five heat transfer leads will thermally connect quadrupole core and LHe supply line;• The cross-section of leads 50 mm x 10 mm;• Cooling down time for the cryomodule is 30 hours;• During cooling initially the cold He gas goes through supply line and temperature changes from 300 K to 2 K. In such regime the enthalpy of the cold gas between 4.2 K and 300 K is utilized as well;• To cool down 1 kg steel from 300 K to 2 K is needed to evaporate 0.8 liters of LHe;• The quadrupole mass is ~ 280 kg.
TILC09, Tsukuba April 16-21, 2009 10
Conductive Cooling Animation
Quadrupole cooled down from 300K to 3.5K in 38 hours.
TILC09, Tsukuba April 16-21, 2009 11
Magnet Assembly TolerancesCase # Description
0 Standard ML quadrupole. Gradient 54 T/m. No correction coils.
1 Right half of the magnet displaced 40 microns up.
2 1st Quadrant displaced 40 microns up.
3 1st Quadrant displaced 40 microns right and 40 microns up.
4 Coil displaced 100 microns up.
5 Coil displaced 100 microns up and 100 microns right.
N1 40um up
N2 40um up
N3 57um up
N4 100um upN5 140um
1 unit = 1 Gauss= 1um
Magnetic center shift in microns
TILC09, Tsukuba April 16-21, 2009 12
Quadrupole Blocks
Half Quadrupole
Quadrupole Assembly
Quadrupole with Cooling Leads
TILC09, Tsukuba April 16-21, 2009 13
Half Quadrupole with Beam Pipe View
Half Quadrupole Yoke
Beam Pipe
Quadrupole-BPM Connection Flange
Quadrupole Supports
TILC09, Tsukuba April 16-21, 2009 14
Quadrupole with Beam Pipe View
TILC09, Tsukuba April 16-21, 2009 15
Quadrupole with BPM
TILC09, Tsukuba April 16-21, 2009 16
Cryomodule Cross-Section
Quadrupole Package
2 Phase He Supply Pipe
TILC09, Tsukuba April 16-21, 2009 17
Quadrupole with BPM Cross-Section
Quadrupole
BPM
TILC09, Tsukuba April 16-21, 2009 18
Cryomodule Cross-Section
TILC09, Tsukuba April 16-21, 2009 19
Quadrupole Side View
TILC09, Tsukuba April 16-21, 2009 20
Cryomodule Cross-Section
TILC09, Tsukuba April 16-21, 2009 21
Cryomodule Cross-Section 3D View (1)
TILC09, Tsukuba April 16-21, 2009 22
Cryomodule Cross-Section 3D View(2)
TILC09, Tsukuba April 16-21, 2009 23
Quadrupole Final Assembly View
Quadrupole
Cooling Leads BPMCurrent Leads
TILC09, Tsukuba April 16-21, 2009 24
Summary • The first look at the splittable quadrupole showed this
approach visibility;• Proposed the quadrupole concept with vertical split;• Quadrupole has a conduction cooling from LHe supply pipe;• Quadrupole mounted around beam pipe outside of the clean room;• BPM has tight connection with quadrupole;• Quadrupole bolted to the strong 300 mm diameter He gas return pipe;• Special attention paid on the magnet assembly and mounting tolerances;• Current leads also conductively cooled;• Magnet cooling down time ~ 38 Hours;• The Quadrupole model with split should be built and tested to verify the design.