and Experiments on EAST L. Wang, G. -N. Luo*, Q. Li, F. Ding, W. J. - - PowerPoint PPT Presentation

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and Experiments on EAST L. Wang, G. -N. Luo*, Q. Li, F. Ding, W. J. - - PowerPoint PPT Presentation

Sep 09, 2023 184 likes •436 views

1 st IAEA TM on Divertor Concepts, Vienna, Sep 29 - Oct 2, 2015 ASIPP ITER-like Tungsten Divertor Development and Experiments on EAST L. Wang, G. -N. Luo*, Q. Li, F. Ding, W. J. Wang, D. M. Yao, G. S. Xu, H. Y. Guo, Y. Liang, Y. W. Sun, X. Z.

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SLIDE 1

ASIPP

ITER-like Tungsten Divertor Development and Experiments on EAST

  • L. Wang, G. -N. Luo*, Q. Li, F. Ding, W. J. Wang, D. M. Yao,
  • G. S. Xu, H. Y. Guo, Y. Liang, Y. W. Sun, X. Z. Gong, B. N. Wan, J.

Li and X. D. Zhang

1st IAEA TM on Divertor Concepts, Vienna, Sep 29 - Oct 2, 2015

*E-mail: gnluo@ipp.ac.cn

Institute of Plasma Physics, Chinese Academy of Sciences

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SLIDE 2

ASIPP

Outline

  • 1. Development of W/Cu Divertor on EAST

– Engineering – Commissioning

  • 2. Experiments of W divertor operation

– Experimental results in 2014 – Preliminary results in 2015

  • 3. Summary & Outlook

2 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 3

ASIPP

Structure Design and Evaluation

3

EAST upper tungsten divertor has modular structure with 80 modules in total. Each module supported by inner/outer rail and middle support.

DOME OVT IVT Cassete Body (CB) Monoblock-PFU

Module = CB + IVT + DOME + OVT

1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 4

ASIPP

4

PFCs Configuration and Connections

End Box (flat type) Monoblock units by

Diffusion bonding Brazing (for legs)

Baffles (flat type) Connecting plate

EB welding

DOME OVT IVT

1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 5

ASIPP

ITER-like Monoblock W/Cu PFUs

  • HIP+HIP: W/Cu mockups were manufactured successfully

by a double Hot Isostatic Pressing (HIP) technology

  • NDT results: Passed NDT check for dual bondings between

W/OFC/CuCrZr tube; HHF testing: 10MW/m2-1000cycles passed

Bulk W-monoblock CuCrZr tube - HIP OFC interlayer - HIP

5 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 6

ASIPP

Flat-type W/Cu PFUs

  • Casting + HIP: The interface of W/Cu were joined by casting,

and then the interface of Cu/CuCrZr was bonded by HIP at lower temperature of 500~600℃.

  • NDT results: Passed NDT check for dual bondings between

W/OFC/CuCrZr plate; HHF testing: 5MW/m2-1000cycles passed

Casting or VPS/CVD VHP

  • r gradient W/Cu layer

6 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 7

ASIPP

E-beam welding of PFCs

60 kV, 6 kW 1 m 1 m 1.4 m

7 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 8

ASIPP

Module: 80pcs Monoblock W: 15,000pcs Flat W tiles: 24,000pcs E-beam seam: > 5000pcs CuCrZr plates: > 8tons CuCrZr tubes: 720pcs/360m

Assembly

2015-06-10

21st ITPA-DSOL Meeting, PPPL, June 9-12, 2015 8

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SLIDE 9

ASIPP

Commissioning in 2014

  • Twice leak events during baking at 170℃, and first

repaired and second evacuated (given-up)

  • Baking at the end of campaign at 270℃ to test

PFCs and find put weak points (possible leaks)

  • After campaign, found 13 leak points and some W

tile damages, w/certain or uncertain causes!

9 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 10

ASIPP

Repair/Optimization in 2015

  • Cooling tube connection:

TIG welding -> soft bellows

  • QA&QC for EBW btw tube

and heat sink enhanced

  • PFCs+CB baking at 250℃

prior to assembly in VV

10

Bellows

沿此处切除 沿原焊缝切除

3D-Printing of broken support leg

1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 11

ASIPP

Commissioning in 2015

1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 11

 Baking : 180~200℃  Plasma discharge in June-July  W-divertor operation in July  No leaking in 2015 W Mo C

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SLIDE 12

ASIPP

Outline

  • 1. Development of W/Cu Divertor on EAST

– Engineering – Commissioning

  • 2. Experiments of W divertor operation

– Experimental results in 2014 – Preliminary results in 2015

  • 3. Summary & Outlook

12 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 13

ASIPP

H mid-plane port

Outer target plane (L section) Inner target plane (H section) Spectroscopy system: Spectrometer & Filter + PMT

  • 350nm - 800nm
  • 300 / 600 /1200 /1800 /3600 l/mm gratings
  • Spatial resolution: 13 mm (poloidal)
  • Time resolution: 200 Hz (12 channels, EMCCD)
  • Max. 20 kHz (PMT)

Monitoring W source on EAST

13

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SLIDE 14

ASIPP

W source in type I ELMy H mode plasma

400KA, LSN, NBI L+R 3MW A strong W source appears during type I ELMs, together with other impurities including C, Li, etc., and inter-ELM vs Te

14

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SLIDE 15

ASIPP

Poloidal distribution of intra-ELM W influx presents a significant increase at strike point region, corresponding to Te distribution at divertor.

W source in type I ELMy H mode plasma

15 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 16

ASIPP

Long pulse W divertor operation in 2015

100 200 300 400 500 temperature oC #57499 upper-outer-divertor 5 10 15 20 25 30 35 2 4 6 Time(s) Da （ a.u）

 Shot#57499: Ip=370kA, B

t=2.25T

, ne=4.5E 19, P

L HW~2MW, P ICRF ~1.6MW Unde r e va lua tio n

 Dive rtor ta rg e t surfa c e te mpe ra ture sa tura te s a fte r ~10s.

16

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SLIDE 17

ASIPP

Plasma detachment in USN W divertor

  • L-mode： Ip=400kA, Bt= 2.25 T, ne=2.5  4.5 x1019m-3, PLHW~1.5MW

3.5s 4.5s 7s

17

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SLIDE 18

ASIPP

In-out asymmetry of divertor particle fluxes during ELMs

  • LSN, C-divertor, Normal Bt
  • USN, W-divertor, Normal Bt

ELM particle flux favors outboard divertor in USN, while favors inboard divertor in LSN. Provides reference for particle exhaust during long-pulse H-mode

  • peration.

Consistent with PS flow, as measured by LFS reciprocating Langmuir probes.

18

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SLIDE 19

ASIPP

Outline

  • 1. Development of W/Cu Divertor on EAST

– Engineering – Commissioning

  • 2. Experiments of W divertor operation

– Experimental results in 2014 – Preliminary results in 2015

  • 3. Summary & Outlook

19 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 20

ASIPP

Summary & Outlook

 EAST upgraded its upper divertor into full W/Cu-PFCs,

employing HIP technology and e-beam welding in 2014.

 Commissioning in 2014 found leak and damage in the

EAST W divertor. Repairing & optimization exhibits technology success in the 2015 campaign.

 Preliminary divertor experiments & study on plasma-

tungsten interactions (PWI) have been carried out.

 W divertor for long-pulse high performance operation of

EAST will be attempted in the coming campaigns.

 Series of experiments to study W-divertor capabilities,

performance, Div-SOL physics and PWI are planned.

20 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015

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SLIDE 21

ASIPP

Thank you!

Welcome collaborations!

21

EAST – Test Bed for ITER & CFETR

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SLIDE 22

ASIPP

B×▽B↓

Initial comparison of W/C divertor particle exhaust capability with Li coating

22

dRsep (m)

  • Total puff (0-7s): USN=1.65E22 D, LSN=1.55E22 D；
  • More input data are needed to draw an

USN/LSN comparison conclusion, especially for long pulse operation.

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SLIDE 23

ASIPP

Tungsten/Wall diagnostics

23

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SLIDE 24

ASIPP

Heat and particle flux diagnostics

24  Parameters to be measured:  nt, Tt, Vf, particle & heat fluxes  toroidal asymmetry …  Spatial resolution:  12-18mm@UI&UO;  15mm@LI,10mm@LO  Time resolution: 20µs  Power supplier: DC 200V, 3A/10A  PWI, divertor and 3D Phys. studies.

toroidal

Upper div-LP arrays in ITER-like W monoblock Div-probe array：Ports D & O

IR thermography

Parameters to be measured: 

Divertor surface temperature,

Target heat flux

 Field of view: 47°×58° Temporal resolution: 

8.7ms (full frame)

0.86ms (1/4 frame)

0.34ms (132*3)

Spatial resolution: 4 mm

24