ned project p. manil – cea/irfu/sis – short model coils meeting #18 – 25/01/2008 – slide...

NED Project P. MANIL – CEA/IRFU/SIS – Short Model Coils meeting #18 – 25/01/2008 – slide 1/18

SHORT MODEL COILS PROGRAM

SMC meeting #18

Pierre MANIL

CEA/IRFU/SIS1. SMC assembly

Modeling, Conception, Outstanding points

2. SMC toolingBladders & Slipshims, Bladder testing device, CERN implication

3. Ceramic insulation windingRAL experience, possible improvements

4. ScheduleBack on the agenda…


1. SMC assembly

P. MANIL – CEA/IRFU/SIS – Short Model Coils meeting #18 – 25/01/2008 – slide 2/18


SMC ASSEMBLY 1/3

MECHANICAL DESIGN PRINCIPLE

Y-pad (iron-steel)

External tube(aluminum)

X-pad(iron-steel)

Yoke(iron-steel)

COILPACK

Keys(iron)

Bladder location

courtesy of François Nunio, CEA

Y

XZ

Shell-based structure:- Aluminum shell- Iron & steel pads- Iron & steel yoke

Pre-stress at room temperaturew/ bladders and keys(in the models to come,the keys width will include theirown nominal size+ the interference key gap)

In-situ stress control- on tube- in coil pack

We have to combine relevant shell pre-stress (controlled by tube’s thickness) and bladders pre-stress (controlled by keys interferences) to define the range of coil pre-stress


SMC ASSEMBLY 2/3

KNOWN / UNKNOW…

Courtesy R. HafaliaH. Félice

Coil properties OKexpected field OK

Rods geometries TBD

Interface withexternal world TBD

Interface between RAL’s coil packAnd assembly TBD

Instrumentation TBD

Lateral prestress OKBladders being tested

Assembly parameters OKryoke~230 mmetube~20 mm

Iron extension OK

Detailed conceptionTBD

Finermechanical studies TBD

- Sensitivity- Mouting steps modeling…

Picture=SD01 magnet

(as an example)


2D MODEL ryoke 230

etube 20

ix 300

iy 0

µ 0.3

-113 MPa -125 MPa

-92 MPa-140 MPa -129 MPa

-52 MPa-156 MPa -136 MPa

-37 MPa-163 MPa -140 MPa

20%

50%

100%

120%

100%

Lorentz

138 MPa

270 MPa

168 MPa52MPa

80 MPa

147 MPa

No separation

Bladder

Cool-down

σx σVM

-102 MPa -113 MPa

-31 MPa -43 MPa

Lore

ntz

107 MPa

225 MPa

80 MPa93 MPa

70 MPa

137 MPa

Bladders

+ CoolingVery homogeneous ~ -110 MPa

Very homogeneous ~ -35 MPa

Very homogeneous ~ -120 MPa


SMC ASSEMBLY 3/3

PRESENT STAKES

3D modeling (CEA part)- defining rods prestress and geometries- validating the whole structure comportment

Mechanical steps- validating the new bladders (see next part) integrating 60 mm-wide bladders in the structure with Federico- validating the LHC iron needs- detailed conception and drawings

Interface with the coil pack (coherent conception):- how to offset the different coil pack sizes? Horseshoe or shims(SMC size: 419.2 x 189.2 mm – ceramic insulated coil size: 436.0 x 206.0 mm)- what horseshoe geometry?- current leads

Superconducting cable needsI confirmed this week to Thierry Boutboul and Federico that we need:- 80 m for Saclay (1 dipole = 2 double pancakes)- 160 m for RAL (2 dipoles)


2. SMC tooling



SMC TOOLING 1/3

BLADDERS AND SLIPSHIMS

Bladders are 420 x 60 mm (SD01: 320 x 54 mm) A set of 3 has been manufactured for tests and qualification Laser winding all along, supplier test under 5 bars pressure

Slipshims are 570 x 62 mm, already manufactured

Laminated steel shims

CourtesyR. Hafalia


SMC TOOLING 2/3

BLADDER TESTING DEVICEVon Mises stresses for ix=300 μm

Strain gauge


SMC TOOLING 3/3

CERN IMPLICATION

Final test cryostat has been identified at CERN(with Christian Giloux & Patrick Viret in Remo Maccaferri’s lab)

- AUTOCAD drawings are available (for integration at Saclay)

- Power supply is OK (up to 15-20 kA available – quench current around 14 kA)

- Thinking asked about external residual field: seems to be OK

CERN has to supply:

- water compressor or hand pump (very high pressure ~500 bars)

- instrumentation & electronics apart from mechanical (uniaxial?) gauges on assembly

- hydraulic press for rods prestress

Courtesy R. Hafalia


3. Ceramic insulation winding



CERAMIC INSULATION WINDING 1/4

SMC WINDING TRIAL 2 (RAL work)



POSSIBLE IMROVEMENTS

Cable clamping during winding- improving clamping on straight sections (butterfly screws…)- adding clamps on heads (cf. picture)- thinking about the need for final compression of the pancake for planarity

’S’ layer transition- softening the edges- machining a head clamp to maintain the transition- thinking about pre-forming…

Question : are metal shavings due to screws a danger?if it is: Teflon screws?

CourtesyPh. Daniel-

Thomas



NB3SN QUADRUPOLES

We will use Nb3Sn quadripoles’ winding machinefor ceramic insulated coil.

To re-design:-Support and fixation plate

-Coil pack ends-Winding clamps

Courtesy M. Segreti

Rotating support (re-used)

Cable stock

Fixation plate

Coil pack end



OVERLOOK

’S’ layer transition

Titanium parts

Clamping(or alternative solution)


4. Schedule



SCHEDULE 1/2

Steering committee of October 15 (CERN) :

Deadlines for Saclay:- SMC support structure (+ tooling) for June 15- Ceramic-insulated coil for late October

Mechanical caraterization of ceramic insulation Courtesy G. de Rijk


SCHEDULE 2/2

Starting point:NED deliverable on innovative insulation (EDMS Id. 885715)

Next step:Performing “stack tests” on ‘very little’ racetrack coils(5 turns, approx. 5 x 10 cm size) for 3 reasons:-To avoid tin losses-To limit the structural relaxing effect dur to twist pitch-To improve the sample cohesion when reaction prestress is relaxed

Winding and tests should be launched during this Trimester

CERAMIC CARACTERIZATION

8-stack test (insulated) (without insulation)

ned project p. manil – cea/irfu/sis – short model coils meeting #18 – 25/01/2008 – slide...

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