Cryogenic Experts Meeting (19 ~ 20.09.2007) Magnet designs for Super-FRS and CR MT/FAIR – Cryogenics and Magnets H. Leibrock.

Cryogenic Experts Meeting (19 ~ 20.09.2007)Cryogenic Experts Meeting (19 ~ 20.09.2007)

Magnet designs for Super-FRS and CR

MT/FAIR – Cryogenics and Magnets

H. Leibrock

Design parameters and layout of the Design parameters and layout of the Super-FRSSuper-FRS

Design Parameters

1500R

Tm20Bρ

%2.5p

Δp

mrad20φ

mrad,40φ

mradmmπ40εε

ion

max

y

x

yx

• 2 Stage

• Multi-Branch

• Super Conducting

• Large-Acceptance

Superferric dipole of Super-FRSSuperferric dipole of Super-FRS

PF2

1.6 T, DC, large aperture

iron-dominated, warm iron

Existing superferric dipole Existing superferric dipole for A1900 Fragment Separator, NSCL, MSUNSCL, MSU

Requirements for the design of a dipoleRequirements for the design of a dipole

The dipoles are conceived as superferric laminated magnets with warm iron yoke, warm pole, and warm beam pipe.

The magnets will run in DC mode.

The dipole should be a sector magnet (trapezoid) with sector shape coils.

Coils should be self protecting (Cu:SC ratio: 10:1 or 9:1; SC: NbTi).

Bath cooled.

All dipoles are in separated cryostats.

No liquid Nitrogen is intended for shielding.

Standard (no HTSC) current leads will be used (less than 250 ampere).

Main parameters for CR/Super-FRS dipoleMain parameters for CR/Super-FRS dipole

Dipole field T 0.15-1.6 0.02

Bending angle Degree 15 / 9.75

Curvature radius, R mm 8125 / 12500

Effective length, Leffe. mm 2126

Good field region mm 225

Pole gap height mm 170

Integral field quality (relative) B=0.15 to 1.2 T: 310-4

B=1.2 to 1.6T:110-4

Laminated iron length, Liron mm 2020

Current, I A 246

Inductance, L H 16.8 at B=1.57T

Weight of iron body Tons 45.5

FAIR collaboration in China

The FAIR China group:The R&D work of superconducting magnets for CR and SuperFRS

The subjects of making the superconducting dipole prototype forSuper-FRS are divided into:

1. Design and fabrication of the yoke: IMP Lanzhou2. Concept design of SC coil, cryostat: IEE Beijing3. Engineering design, fabrication and testing of SC coil, including

cryostat: ASIPP Hefei4. Final assembly, testing and measurements: IMP and ASIPP in

Lanzhou

goal: dipole prototype finished in spring 2008.

Opera modelsOpera models

the 2D quarter profile of the 2D quarter profile of CR dipoleCR dipole

the 3D model of the 3D model of Super-FRS dipoleSuper-FRS dipole

Punching die assembly and punching sheets

The assembly for the punching dieThe assembly for the punching die The Punching die assemblyThe Punching die assembly

The Punching die installationThe Punching die installation

The first punching sheetThe first punching sheet

The punching sheets The punching sheets

Two punching sheets: 2200mm*1450mmTwo punching sheets: 2200mm*1450mm

End block fabricating steps

Laminated sheetsLaminated sheets Stairs stacking Stairs stacking

and gluedand glued After cuttingAfter cutting

End block stacking and cutting tests

Stacking stair shape after gluedStacking stair shape after glued

Cutting by the machineCutting by the machine Laminated end block after cuttingLaminated end block after cutting

Fixed on vertical turning machine Fixed on vertical turning machine

Half yoke stacking with end block and laminated sheets Half yoke stacking with end block and laminated sheets in the middle part in the middle part

Laminated sheetsLaminated sheets End blocksEnd blocks

Welding platesWelding plates

End-platesEnd-plates

Inserting platesInserting plates

Half yoke stamping and welding with steel Half yoke stamping and welding with steel plates on 300 tons oil pressure machineplates on 300 tons oil pressure machine

Coil and cryostatCoil and cryostat

lower: Oxford NbTi conductor

upper: the cross section of coil and cryostat

Main parameters of conductor and coilMain parameters of conductor and coil

Item Parameters Unit

Superconducting strands NbTi Oxford

Dimension of conductor 1.432.23 mm

Filament diameter df 66 m

Number of Sc filaments 55

Ratio of Cu and no Cu 10.7

RRR of Cu in core wire 133

Operating current Iop 246 A

Number of the turns 2820=560 Turn

Section size of coil 52.148.8 Mm

Cooling cubic capacity Pool 0.05 M3

Weight of coil and cryostat 1744 Kg

IPP superconducting test coil fabrication

IPP superconducting test coil fabrication

Structure of thermal shield and cryostat

self protecting dipoles (Tmax < 120 K, Vmax < 200 V)

Cryostat consist of two main sub-assemblies;

1) A magnet cryostat housing the superconducting coil

2) Satellite cryostat with cryogenic reservoirs and connections to outside world

Superferric Multiplets for the Super-FRSSuperferric Multiplets for the Super-FRS

• Warm bore diameter of 38 cm• Iron-dominated, cold iron • Quadrupole triplet + separated sextupoles• Octupole correction coils are embedded

Superferric Triplet

(BigRIBS @ RIKEN)

3d Opera model of the quadrupole3d Opera model of the quadrupole

The magnet with the main coils and the octupole coils

The main parameters of the magnet are:

Yoke diameter: 1400 mm

Pole tip radius: 250 mm

Gradient quality: ±8∙10-4

Main coil:

Coil cross section: 55×50mm2

Maximum current density: 127 A/mm2

Pole tip field: 2.5 T (10 T/m)

max. field @ coil: 4.5 T

3d Opera model 3d Opera model of sextupoleof sextupole

The main parameters of the magnet are:

Yoke diameter: 800 mm

Pole tip radius: 235 mm

Gradient quality: ±8∙10-4

Coil cross section: 20×20 mm2

Maximum current density: 132 A/mm2

Maximum field in the coil: 1.6 T

Maximum field at pole: 0.8 T

Contract with Toshiba Corporation: Conceptual design

Toshiba designed quadrupole triplets for RIKEN.

Super-FRS requirements are similar

Conceptual design study of a Superferric multiplet for FAIR

Conceptual design study of asuperferric multiplet for FAIR

Cold mass support figurations

StatusStatus

The manufacture of the punching die of the dipole was finished. After punching sheets accuracy checking with laser tracker, the punching die has been fine-adjusted. Now IMP finished punching of all iron sheets.

IPP are fabricating the testing coil, some moulds and tools can be used for the prototype coils. IPP want to get more experiences and knowledge from the tests to define the detail design for the cryostat.

Main dimension and assembly of yoke and cryostat were confirmed.

Conceptual design of a multiplet exists

A contract for a long quadrupole prototype is prepared