TI development for IBL and perspectives for SLHC

IN2P3

Why Titanium for cooling circuits?

Titanium material collect the most important criteria for cooling circuit design: Low CTE: important parameter to reduce

material necessary for geometrical stability and improvement of material delaminations

Good Thermal conductivity: essential for thermal performances and material economy

Non corrosive Good weld ability Good Bend ability Ultra thin pipes can be produced High mechanical characteristics Low activation under irradiation X0% more interesting the Stainless Steel (X0

Ti /X0 316 L ≈ 2 2 mm ID, 0.1mm Thickness Ti pipe 2mm ID, 0.05mm Thickness 316L pipe for material conservation)

Material CTE (µm/m°C)Ti 8.9Al (3003 Alloy) 23.2316L (Stainless steal) 16Silicon 2.49Graphite 0.6-4

Material Th. Cond. (W/m°K)Ti 17Al (3003 Alloy) 163316L (Stainless steal) 16.2Silicon 105Graphite 20-100

Material Young mod. (Gpa) Tensil Strength( Mpa)Ti 116 220Al (3003 Alloy) 68.9 124316L (Stainless steal) 193 558

Progress made @ IN2P3 (LAPP, CPPM)Several Batches have been produced

and tested @ IN2P3All pipes were ordered @ Minitubes

(Grenoble, France) but price is very high. A new vendor (UK, Schefield) Is under qualification for IBL

Welding process for joining is well controlled (Laser and EB welding have been tested with success)

Bending process have been tested with success needs more improvement if small bending radius needed

Production requirementsT40 Grade 2Drawn seamless tubesOxyde layer minimal (<10µm)

Welding processBoth Laser welding and Electron

beam have been qualifiedThe two techniques require a

controlled gap between the pipe and the fitting to avoid shrinkage

Specific cleaning has to be applied to avoid welding porosity

The last test made was perfect in terms of weld quality and has been tested under CO2 conditions (150 Bars proof test & -50°C thermal shocks)

EB welding

Laser welding

Bending ProcessPartial Bend test was made

with success using sand filling and manual bending operation (same technique used for pixel piping)

Ti pipes annealing is more complex due to high temperature and risk of oxide formation (vacuum or controlled atmosphere needed)

More work remain to be done to optimize the technique, but no show stopper

Toward Upgrade Type and dimension of Ti pipe

have been almost frozen for IBL Project

Meanwhile some R&D could be done to minimize material involved by Ti piping: Pipe distribution, actually one pipe

is used/stave in the barrel we could study the pipe sharing between two or more stave structures

Pipe thickness is linked to the maximal pressure applied and inside diameter optimization of the cooling parameters (pipe ID) would permit to get thinner pipes (the production limit is about 0.05mm thick pipes @ Minitubes company) Thickness can be reduced linearly with the inside radius

Cylindrical shell

Uniform radial pressure, p (force per unitcircumferential length)

Notation file Provides a description of Table 28 and the notation used.

Enter dimensions,properties and loading

Shell thickness: t 0.5 in

Mean radius: R 15 ft

Height: y 40 ft

Modulus of elasticity: E 30 106lbf

in2

Poisson's ratio: 0.3

Uniform radial pressure: q 100lbf

in2

Note: For these equations to be valid, R/t>10.

Rt

360

Calculationprocedure

Meridional stress:

1 0lbf

in2 1 0

lbf

in2

Circumferential stress:

2q R

t 2 3.6 10

4

lbf

in2

Radial displacement of circumference:

Rq R

2

E t R 0.216in

Change in height:

yq R y

E t y 0.173 in

Rotation:

0 rad 0rad

Cylindrical shell

Uniform radial pressure, p (force per unitcircumferential length)

Notation file Provides a description of Table 28 and the notation used.

Enter dimensions,properties and loading

Shell thickness: t 0.5 in

Mean radius: R 15 ft

Height: y 40 ft

Modulus of elasticity: E 30 106

lbf

in2

Poisson's ratio: 0.3

Uniform radial pressure: q 100 lbf

in2

Note: For these equations to be valid, R/t>10.

Rt

360

Calculationprocedure

Meridional stress:

1 0lbf

in2 1 0

lbf

in2

Circumferential stress:

2q R

t 2 3.6 104

lbf

in2

Radial displacement of c ircumference:

Rq R

2E t

R 0.216i n

Change in height:

yq R y

E t y 0.173 i n

Rotation:

0 rad 0rad

Toward UpgradeNew Ti alloys should be also investigated

while some grade gives higher mechanical resistances close collaboration with manufacturers

Material Young mod. (Gpa) Tensil Strength( Mpa)Grade 2 116 220Grade 5 110 910

8

Pipes orderTitanium (ordered)

Type 1 : •ID : 2.00+0.05/-0.00mm •Thickness : 0.10+0.05/-0.00mm •Nom OD = 2.275mm• 3 m (+/-10.00mm) X 20 pieces (total length 60m)• £46.75 per metre = £2805

Type 2 : •ID : 0.80+0.05/-0.00mm •OD x 1.2+0.05/-0.00mm •Nominal Thickness = 0.20mm•X 3 m (+/-10.00mm) X 20 pieces (total length 60m)£49.50 per metre = £2970

Delivery ?