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. Gong, B. N. Wan, J. Li and X. D. Zhang *E-mail: gnluo@ipp.ac.cn Institute of Plasma Physics, Chinese Academy of Sciences
Outline ASIPP 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 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 2
Structure Design and Evaluation ASIPP Cassete Body (CB) Module = CB + IVT + DOME + OVT EAST upper tungsten divertor DOME has modular structure with 80 IVT OVT modules in total. Each module supported by inner/outer rail Monoblock-PFU and middle support. 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 3
PFCs Configuration and Connections ASIPP Baffles (flat type) OVT Connecting plate IVT Monoblock units by Diffusion bonding Brazing (for legs) DOME EB welding End Box (flat type) 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 4
ITER-like Monoblock W/Cu PFUs ASIPP • 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/m 2 -1000cycles passed Bulk W-monoblock CuCrZr tube - HIP OFC interlayer - HIP 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 5
Flat-type W/Cu PFUs ASIPP • 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/m 2 -1000cycles passed Casting or VPS/CVD or gradient W/Cu layer VHP 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 6
E-beam welding of PFCs ASIPP 60 kV, 6 kW 1 m 1.4 m 1 m 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 7
Assembly ASIPP Module: 80pcs Monoblock W: 15,000pcs Flat W tiles: 24,000pcs E-beam seam: > 5000pcs CuCrZr plates: > 8tons CuCrZr tubes: 720pcs/360m 21st ITPA-DSOL Meeting, PPPL, June 9-12, 2015 2015-06-10 8
Commissioning in 2014 ASIPP • 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! 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 9
Repair/Optimization in 2015 ASIPP Bellows 沿原焊缝切除 3D-Printing of broken support leg 沿此处切除 • 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 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 10
Commissioning in 2015 ASIPP Baking : 180~200 ℃ W Plasma discharge in June-July W-divertor operation in July No leaking in 2015 Mo C 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 11
Outline ASIPP 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 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 12
Monitoring W source on EAST ASIPP H mid-plane port Outer target plane (L 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) Inner target plane Max. 20 kHz (PMT) (H section) 13
W source in type I ELMy H mode plasma ASIPP 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
W source in type I ELMy H mode plasma ASIPP Poloidal distribution of intra-ELM W influx presents a significant increase at strike point region, corresponding to T e distribution at divertor. 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 15
Long pulse W divertor operation in 2015 ASIPP Shot#57499: Ip=370kA, B t =2.25T , n e =4.5E 19, P HW ~2MW, P ICRF ~1.6MW L #57499 upper-outer-divertor 500 400 temperature o C 300 200 100 0 6 4 a.u） Da （ 2 0 0 5 10 15 20 25 30 35 Time(s) Unde r e va lua tio n 16 Dive rtor ta rg e t surfa c e te mpe ra ture sa tura te s a fte r ~10s.
Plasma detachment in USN W divertor ASIPP L-mode ： Ip=400kA, Bt= 2.25 T, ne=2.5 4.5 x10 19 m -3 , P LHW ~1.5MW 3.5s 4.5s 7s 17
In-out asymmetry of divertor particle fluxes during ELMs ASIPP 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 operation. Consistent with PS flow, as measured by LFS reciprocating Langmuir probes. LSN, C-divertor, Normal Bt 18
Outline ASIPP 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 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 19
Summary & Outlook ASIPP 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. 1st IAEA TM on Divertor Concepts, Sep 29 - Oct 2, Vienna, 2015 20
ASIPP Thank you! Welcome collaborations! 21 EAST – Test Bed for ITER & CFETR
Initial comparison of W/C divertor particle exhaust capability with Li coating ASIPP B ×▽ B ↓ dR sep (m) Total puff (0-7s): USN=1.65E22 D, LSN=1.55E22 D ； More input data are needed to draw an 22 USN/LSN comparison conclusion, especially for long pulse operation.
Tungsten/Wall diagnostics ASIPP 23
Heat and particle flux diagnostics ASIPP IR thermography Div-probe array ： Ports D & O Parameters to be measured: Parameters to be measured: Divertor surface temperature, nt, Tt, Vf, particle & heat fluxes Target heat flux toroidal asymmetry … Field of view: 47 °× 58 ° Spatial resolution: Temporal resolution: 12-18mm@UI&UO; 8.7ms (full frame) 15mm@LI,10mm@LO 0.86ms (1/4 frame) Time resolution: 20µs 0.34ms (132*3) Power supplier: DC 200V, 3A/10A Spatial resolution: 4 mm PWI, divertor and 3D Phys. studies. toroidal Upper div-LP arrays in ITER-like W monoblock 24 24
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