eucard-wp7-hfm collaboration meeting 15/11/2011

EuCARD-WP7-HFM Collaboration Meeting

15/11/2011

Task 3 : High Field Magnet

Thomas Dalla Foglia, Melanie Devaux, Maria Durante, Philippe Fazilleau, Jean-Jacques Goc, Pierre Manil, Attilio Milanese, Jean-Francois Millot, Juan Carlos Perez, Alain Przybylski, Jean-Michel Rifflet, Gijs de Rijk,

Francoise Rondeaux

Outline

•Task 3 status report–Recall of the objectives of the Task–Recent activities

•Specification•Conductor•Design•Tests•Winding tooling•Dipole – Insert Interaction & Interface

–Work for the next 6 months–Global planning–Conclusions

15/11/2011 2CEA/DSM/Irfu/SACM – J.M. Rifflet - EuCARD HFM - Task 3 : High Field Magnet

15/11/2011 3

Recall of the objectives of the Task•Design, build and test a dipole model to upgrade the

superconducting cable test facility FRESCA at CERN –1.5 m long,–100 mm aperture –13 T magnetic field (with the possibility to go to 15 T for Fresca2)–Nb3Sn high current Rutherford cables.

•Dipole model as a test bed for large high field accelerator magnets.

What WhoMagnet design CEA and CERN

Conductor characterization CERN

Thermal design and thermal component tests CEA, CERN and PWR

Coils fabrication CEA

Magnet assembly CERN

Cryogenic tests CERN

CEA/DSM/Irfu/SACM – J.M. Rifflet - EuCARD HFM - Task 3 : High Field Magnet

Specification

• The specification was slightly modified (minor adjustments and addition of missing data) and approved recently (10/10/2011)

• It is accessible athttps://espace.cern.ch/EuCARD/WP7/SWGroup/Shared Documents/FRESCA2_magnet_specification-v3.1.pdf

415/11/2011 CEA/DSM/Irfu/SACM – J.M. Rifflet - EuCARD HFM - Task 3 : High Field Magnet

https://espace.cern.ch/EuCARD/WP7/SWGroup/Shared%20Documents/FRESCA2_magnet_specification-v3.1.pdf



Conductor• Conductor design working group acts mainly by mail exchanges

and telephone calls (not formal WG meeting) but it works• Part of the work is done in the framework of the French Special

Contribution to LHC• 10 km CERN order to Brucker

– 1st billet : delivered in march 2011– 2nd billet : drawn, delivered at CERN ?– 3rd billet : drawing being done

• 10 km CERN order to OST– Breakage delays delivery 12/2011

• 15 km CEA order to Brucker– Kick off : 04/08/2011– Delivery: 02/2012

• 15 km CEA order to OST + 10 km option– Kick off : 18/08/2011– Delivery: 04/2012

• 20 km CEA order + options (+10,+15 km)– Call for tender under preparation

515/11/2011

Qualification lengths

Pilot lengths

Production lengths


6

Design : Magnet• Preliminary Magnet design Working Group closed after the

ESAC dipole review (14 meetings)• Magnet Design Working Group created in January. Already 14

meetings have taken place• The magnet design is considered as fixed :

15/11/2011

Some recent changes done, e.g. insulation thickness between coil 2 and 3 : 0.5 1.5 mm


7

Design : Cold mass

15/11/2011

Mechanical structure is fixed, however some points are still pending (see next pages):


8

Design : Thermal studiesThermal studies (WP 7.2)• Study at 4.2 K OK

– Modeling of cool-down process – 2 D transient model» From 300 k to 20 K : indirect

col-down through cooling tubes» From 20 K to 4.2 K : direct

filling with helium

• Modeling of thermal process in the magnet during ramping process – 2 D steady state model

• New study : Two fluids model at 1.8 K


9

Design : Protection– Protection: 2 or 3 quench heaters per

quadrant ?• At tdet = 100 ms (50 ms for

detection and 50 ms for heaters activation),

– 2 heaters : T max = 244 K– 3 heaters : T max = 224 k

• 3 heaters reduce the thermal gradient


2 heaters

3 heaters

P. Fazilleau: report within a few days

2 heaters

2 heaters3 heaters

3 heaters

10

• Simpler tooling• Is the winding easier ? Yes• Is the conductor stable and in

good position ? Yes

Chosen configuration

Tests : Upside down winding

15/11/2011

But

Dishing


11

Tests : Dishing measurement- Measure dishing effect in order

to take it into account for the tooling design

- Choose the winding parameters minimizing dishing effect

• It exists on cable before winding• It is enhanced during coil

winding

Could it be corrected by adjusting the cabling parameters ? Studies ongoing at CERN


12

Tests : Jump layer test- Check jump layer design- Choose between single or

double bending

• Test done with annealed copper, non annealed copper, PIT Nb3Sn cable with 120-mm and 140-mm twist pitch Not annealed Cu and the two PIT cables exhibit a similar behaviour

• Dishing is the same in the two winding directions

The double bending is chosenSome minor improvements

(gaps in the grooves, plate fixation, …) on the real tooling

15/11/2011

single bending double bending


13

Tests : Cable behavior during heat treatment1) PIT cable without "end mandrel"• The dishing is significantly

increased after heat treatment• No significant change in overall

dimensions

2) PIT cable with "end mandrel"• The cable is unstable in straight

parts• The end mandrel has moved

(~0.6 mm) and 1.4 mm gap between cable and mandrel has been measured

• Dishing in the end part has disappeared


14

Tests : Cable behavior during heat treatment

3) Cu cable with "end mandrel“ (short thermal cycle)• The dishing is increased in the end part and

has disappeared in the straight sections• No move of the end mandrel• Some Cu traces on shims

Following tests:• New support allowing 1-10 complete turns• Additional cycles with titanium, stainless and

magnetic steel


15

Tests : Mechanical structure

An assembly test of the structure with a dummy magnet is in preparation

• Parts fabrication will be launched soon this year, after small drawing updates


Structure mock-up

16

Winding Tooling

15/11/2011

• Drawing appoval : 13/10• Call for tender end of

November• Fabrication end of January

Winding of a Cu double pancake in March 2012


Dipole – Insert Interaction & Interface• Mechanics:

– Inner free dipole diameter = 100 mm– The insert is mechanically independent of the

dipole (gap)

• Protection:– Coupling of magnets and effects on protection

should start soon

15/11/2011 17CEA/DSM/Irfu/SACM – J.M. Rifflet - EuCARD HFM - Task 3 : High Field Magnet

Activities for the next 6 months

1815/11/2011

• Splices and connection configuration needed for end 11/2011

• Dipole protection design 15/11/2011

• Reaction and impregnation tooling design end 12/2011

• Coil reaction studies end 02/2012

• Coil 3-4 Winding tooling procurement mid 01/2012

• Copper coil 3-4 winding end 02/2012

• Coil 3-4 Reaction tooling procurement mid 03/2012

• Coil 3-4 Impregnation tooling procurement end 03/2012

• Mechanical structure assembly procurement end 03/2012

• Detailed coil fabrication procedures end 03/2012

• Coil components procurement & characterization 31/03/2012


15/11/2011 19

Global Planning


EuCARD 7.3Specifications, magnet preliminary design Fresca 2 Nb3Sn Dipole designCoils component and tooling detailed studiesCoil component and tooling procurementAssembly structure procurement and testConducteur procurement QUALIFICATION PILOT PRODUCTION

Cabling and characterizationCu dummy coil manufacturingCoil manufacturingCoil testsDipole assembly M1

Dipole tests M1

Design studies, CAO (CEA and CERN)

CEA and CERN realisation

Procurements

at CERN

EuCARD Milestone or Deliverable

CEF Milestone or Deliverable

39 42 4524 27 30 33 36 48

2009 2010 2011 2012 2013

T2

M0 3 6

T2 T3 T4 T1 T2T1 T2 T3 T4 T1 T4

9 12 15 18 21

T3 T4 T1 T2 T3T3 T4 T1

ble

15/11/2011 20

Conclusions•Fresca2 magnet design (2D and 3D) is now well advanced.

Some point still to be fixed soon•Winding tooling is defined and will be tested beginning of

2012•Validation tests have started. More tests have to be done to

understand the behaviour of the cable during winding and during the heat treatment. This is necessary to fix the winding and curing process.

•Tests made with PIT cable must be repeated wit RRP cable•A structure assembly test is planned early 2012

•A lot of work has been done but …

a lot of work is still to be done


eucard-wp7-hfm collaboration meeting 15/11/2011

Documents

high field magnet design

rifflet eucard hfm task

high field magnetdesign

cern order

t magnetic field

jeanmichel rifflet

placethe magnet design

dipole model