Target #3 mechanical design - CERN

n_TOF target #3 Production readiness review – Final mechanical design

Marc Timmins EN/MME, Vincent Maire EN/MME29th of May 2019

M. Timmins & V. Maire n_TOF target #3 PRR 29-05-2019

Outline

2

• Mechanical design overview

• Target core and anti-creep structure

• Target vessel and moderators

• Carrier frame

• Target piping work

• Instrumentation

• Design vs Safety requirements

• Conclusions


Mechanical design overview

3M. Timmins & V. Maire n_TOF target #3 PRR 29-05-2019

4

Target core and anti-creep structure



5

Core

178kg

550kg

Total: 1440kg


6


Restricted

area

Anti-creep structure


Anti creep plate

7

IEDR 2018 PRR 2019

• More cooling efficient (direct

contact of N2 on Pb.

• Easier to produce (Only one part,

no extrusion, predicted less

deformation thanks to symmetric

design. See protoype in next talk

N2

flow



PbPbPbPb

8

Target core and anti-creep structureAnti-creep structure


Target vessel and moderators

9

Gap 2.5mm


H. Moderator with bi-metallic transition

V. Moderator without Bi-metallic transition

10

Target vessel and moderators

Vertical moderator supportVessel


11

Target vessel and moderatorsBimetallic transition


12

Target vessel and moderatorsH. moderator


• Withstand 2.5barg (see Laurene’s talk)

• Limited deformations <1mm (see Laurene’s talk)

• Limited Al. seen by the beam (no more than current target)

• Limit number of welds to increase robustness (Insert machined from a bulk)

13

Target vessel and moderatorsH. moderator – Inlet/outlet nozzle


14

Target vessel and moderatorsV. moderator


15

Target vessel and

moderators

Pb wedge

V moderator

Moderator

cup

gap

2.5mmWall thickness

4mm

Closing weld

(no pressure)

Pb 47kg

Lead wedge


Carrier frame

16

1550 mm

830 mm

626 mm


Carrier frame

17

Lifting

hoist

Lifting

bar

Grip hooks

for lifting bar

Survey target


Carrier frame

18

Gap: 15 mm

Gap: 30 mm

Pool

Existing positioning pins


19

Target piping

work

2.7

m

In Situ

welding

Disconnection

area

Flexible

pipes

Flexible

pipes


20

Instrumentation

2x3 thermo-

couples

type K.

Probe

tips

Feedthrough


Design vs Safety requirements

21

N2 Vessel <= 0.5barg (out of scope)

Water in moderators = 2.5barg (CAT. SEP)

CAT. SEP (Sound Engineering

Practices)

However

Category 1 recommendations will be applied due to a highly radioactive environment,

with difficult access.

1. Design: All welded joints are checked against pressure vessel standards (See

Laurene’s talk)

2. Manufacturing: Material certificates, raw material inspection, weld book (certified

process + certified welders)

3. Inspection: 100% visual & PT, 100% x-ray wherever possible. (See Marc’s talk)

4. Leak & pressure tests (See Marc’s talk)

5. Full tractability record

Conclusions

22

• Functional design completed.

• 80% of 2D drawings completed.

• Fine tuning production processes.

• Prototypes and tests completed or launched.

• Challenging manufacturing operations, but no

showstoppers.


Thankyou for your attention

Questions ?

Back-up slide

24M. Timmins & V. Maire n_TOF target #3 PRR 29-05-2019

N_TOF target 2 (current)

Target #3 mechanical design - CERN

Documents

Transcript of Target #3 mechanical design - CERN