ILC Main Linac Superconducting Quadrupole V Kashikhin for

ILC Main Linac Superconducting Quadrupole V. Kashikhin for Superconducting Magnet Team

Outline • • • Split quadrupole issues Quadrupole concept Conductive cooling Magnetic design Installation and disassembly Summary TILC 09, Tsukuba April 16 -21, 2009 2

Split Quadrupole Concept Design Team The Quadrupole concept was designed in short period of time by: • • Miao Yu- Cooling down analysis Mauricio Lopes- Magnetic center shift Yuri Orlov- 3 D design and integration Vladimir Kashikhin- Magnet concept TILC 09, Tsukuba April 16 -21, 2009 3

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. TILC 09, Tsukuba April 16 -21, 2009 4

ILC Quadrupole Specification TILC 09, Tsukuba April 16 -21, 2009 5

Quadrupole Mechanical Concept It was chosen the quadrupole design with racetrack coils which easy to split in vertical or horizontal direction. TILC 09, Tsukuba April 16 -21, 2009 6

Quadrupole Fabrication Split plane Built and Tested Quadrupole Model 1 • 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. TILC 09, Tsukuba April 16 -21, 2009 7

Quadrupole Wiring Scheme Quadrupole consists of 4 coils. Each coil has 3 sections of Nb. Ti 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. Split line Quadrupole and dipole sections connected in quadrupole and dipole configuration as shown in figure. The connections easy to rearrange for split configuration TILC 09, Tsukuba April 16 -21, 2009 8

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. TILC 09, Tsukuba April 16 -21, 2009 9

Conductive Cooling Animation Quadrupole cooled down from 300 K to 3. 5 K in 38 hours. TILC 09, Tsukuba April 16 -21, 2009 10

Magnet Assembly Tolerances Case # N 2 40 um up N 5 140 um N 3 57 um up N 4 100 um up Description 0 Standard ML quadrupole. Gradient 54 T/m. No correction coils. 1 Right half of the magnet displaced 40 microns up. 2 1 st Quadrant displaced 40 microns up. 3 1 st 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. Magnetic center shift in microns N 1 40 um up 1 unit = 1 Gauss= 1 um TILC 09, Tsukuba April 16 -21, 2009 11

Quadrupole Blocks Half Quadrupole Assembly Quadrupole with Cooling Leads TILC 09, Tsukuba April 16 -21, 2009 12

Half Quadrupole with Beam Pipe View Quadrupole Supports Beam Pipe Half Quadrupole Yoke Quadrupole-BPM Connection Flange TILC 09, Tsukuba April 16 -21, 2009 13

Quadrupole with Beam Pipe View TILC 09, Tsukuba April 16 -21, 2009 14

Quadrupole with BPM TILC 09, Tsukuba April 16 -21, 2009 15

Cryomodule Cross-Section Quadrupole Package 2 Phase He Supply Pipe TILC 09, Tsukuba April 16 -21, 2009 16

Quadrupole with BPM Cross-Section Quadrupole TILC 09, Tsukuba April 16 -21, 2009 BPM 17

Cryomodule Cross-Section TILC 09, Tsukuba April 16 -21, 2009 18

Quadrupole Side View TILC 09, Tsukuba April 16 -21, 2009 19

Cryomodule Cross-Section TILC 09, Tsukuba April 16 -21, 2009 20

Cryomodule Cross-Section 3 D View (1) TILC 09, Tsukuba April 16 -21, 2009 21

Cryomodule Cross-Section 3 D View(2) TILC 09, Tsukuba April 16 -21, 2009 22

Quadrupole Final Assembly View Quadrupole Cooling Leads Current Leads TILC 09, Tsukuba April 16 -21, 2009 BPM 23

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. TILC 09, Tsukuba April 16 -21, 2009 24