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Recent Results on Tore Supra with the ITER PAM Lower Hybrid Prototype Antenna. G.T. Hoang, A. Ekedahl with the contribution of the CIMES Project Team. CIMES Project granted with Euratom preferential support 2000 a new LHCD CW capability a new IR monitoring capability

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Recent Results on Tore Supra

with the ITER PAM

Lower Hybrid Prototype Antenna

G.T. Hoang, A. Ekedahl

with the contribution of the CIMES Project Team


A brief history of cimes

CIMES Project granted with Euratom preferential support 2000

a new LHCD CW capability

a new IR monitoring capability

a CW pellet injector

a new cooling capability

« A brief history of CIMES »

  • 2009

  • 2003

  • 2003

  • 2002


Tore supra pfc monitoring by ir

LH launcher 2000

TORE SUPRA

Tore Supra PFC monitoring by IR

  • All the PFCs are actively cooled by pressurized water (120°C; 1100 tons/hour)

  • Temperature monitoring by actively cooled IR endoscopes [Guilhem 2005]

ICRF antenna

TPL (7.5m2)

574 elements

Toroidal Pumped Limiter with heat exhaust capability of 10MW.m-2

[Garin, Fus Eng Design 2005 ]

Implementation of IR cameras at JET

[Gauthier, CEA-IRFM]


Tore supra cw pellet injector

TORE SUPRA 2000

Tore Supra CW Pellet Injector

  • Relevant for ITER:

  • Reliable screw extruder

  • Pneumatic acceleration does not require large pumping system (<15 mbar.l for 2mm pellets up to 800 m/s)

Same injector implemented at JET [A. Geraud]

2-minute Pellet Fueled LHCD Plasma

(155 pellets. Very stable speed of 0.5 km/s)


The new tore supra lhcd system

a new LHCD CW capability 2000

a new ITER-relevant PAM (Passive-Active Multijunction) launcher, complementing the FAM (Full Active Multijunction and replacing the 20 year old grill

a complete renewal of the power transmitter, including 16 new klystrons TH2103C (Thalès Electron Devices)

The New Tore Supra LHCD system


3 7ghz cw klystron th2103c

700 kW / 1000s 2000

3.7GHz / CW Klystron TH2103C

  • Routinely, 620kW/CW @ VSWR =1.4, and 720kW/CW @ VSWR=1

  • Efficiency of 47%

  • 16+2 klystrons ordered, today 14 delivered and commissioned separately

F. Kazarian et al., FED (2009);

L. Delpech et al., 18th RF Top Conf. (2009)


First half of lh transmitter equipped with th2103c
First Half of LH Transmitter Equipped with TH2103C 2000

R. Magne, P. Mollard et al.


end january 2010 2000: Tore Supra restarts operation after Xmas shutdown

FAM: not installed

PAM: fed with 8 “old” klystrons (Ptransmittermax~2.8MW)

end march 2010: short Tore Supra shutdown

FAM: reinstalled and connected to the first series of 8 “new” klystrons (Ptransmittermax~ 5.5MW > PFAMmax)

PAM no change (Ptransmittermax~ 2.8MW < PPAMmax)

end 2010: LHCD transmitter shutdown

FAM no change (Ptransmittermax~5.5MW > PFAMmax)

PAM connected to second series of 8 “new” klystrons (Ptransmittermax~5.5MW > PPAMmax)

Near term activities on transmitter


Operational domain of long pulse operation extended 2000

  • Physics issues zero loop voltage physics at high density/high plasma current, incl. transport, MHD-fast particles, intrinsic rotation.

  • Long discharge mastering (physics & device protection control)



Motivations for a new LHCD Launcher 2000

  • A key element of the CIMES project

    • More SS LHCD power at 3.7GHz

    • Improved domain of long pulse operation for Tore Supra: higher density and plasma current

    • Physics of SS plasmas and technology test of PAM concept

  • The PAM is the present prefered solution for ITER LHCD (coupling issues, protection of the power source (low reflected power))

The PAM is presently the heaviest object on a Tore Supra port (~8 tons)


Manufacturing tore supra pam launcher

Concept. Ph. Bibet 2000

Manufacturing Tore Supra PAM launcher

  • ITER-relevant concept for LHCD system

  • The Tore Supra PAM scales as ¼ of the ITER launcher size

D. Guilhem et al., 18th RF Top Conf. (2009)

Mode Converters

(rear view)

Passive Active Multijunction

(front view)



3 days conditioning 2000

10 days with plasma; 260 shots

28/10/09: starting the transmitter and PAM commissioning (60kW per klystron/10ms, no plasma)

30/10/09: first plasma discharges

P = 450kW / 4.5s

N// OK

Very low reflection coefficient (~1.5%) at long distance (>6cm)

17/11/09: 600kW / 5.5s + tests SMBI

01/12/09: 1MW / 5s

02/12/09: 1.9 MW/ 10s + variations in n//

16/12/09: 2.7MW / 17s

An extremely fast commissioning period


Participants from: 2000

EU

ENEA (7), POLITO Italy (1)

IST (1)

UKAEA (“CCFE”) (3)

IPP Prague (2)

ASIPP (3) & SWIP China (2)

IPR India (1)

NFRI Korea (3)

A clear interest from the LHCD community


Pam launcher commissioned on tore supra
PAM Launcher Commissioned on Tore Supra 2000

  • Major results after few days of commissioning

  • ~ 2.7 MW coupled for 17 seconds (~ 24 MW/m2)


Recent 2010 progress [1/3] 2000

2.7MW / 35s

10 cm

2.7 MW (~ 24 MW/m2) coupled for 35 secondsafter ~ 280 shots

IR surveillance

200°C

125°C


Recent 2010 progress [2/3] 2000

2.75 MW ( 25 MW/m2) coupled for ~80 seconds

ELHCD = 220MJ

(25/03/2010)

IR surveillance

T [°C]

100

250

400


Recent 2010 progress [3/3] 2000

Full CD regime (PAM alone) during 50 s/2.2MW

  • CD efficiency similar to standard full active antenna, weak sensitivity with edge density.


Hard-X Profile versus N 2000//

  • In presence of electric field; loop voltage drop ~ 40%

TS #44159-44174, 0.5 MW-2MW, Ip ~ 0.95MA, line density ~ 3.7x1019m-2


Low reflected power level 2000

  • even at a large plasma-antenna gap(follows design specifications)

  • in good agreement with modeling

Low power (~200kW) to avoid non-linear effects on coupling


Non linear effect on coupling observed
Non-Linear Effect on Coupling Observed 2000

Reflection coefficient

  • increases with power at small L// (low ne, Te at grill)  reduction of density at grill

  • stays constant at large L// (high ne, Te at grill)

Small L//

(PAM behind the IC antenna limiters)

~1.8MW

Large L//

(PAM in front of the IC antenna limiters)

Power waveform


Power coupling maintained under elm like conditions
Power Coupling Maintained under ELM-like Conditions 2000

Supersonic Molecular Beam Injection (SMBI) is used to mimic ELMs


Hard x rays during smbi
Hard-X rays during SMBI 2000

  • HXR takes finite time to respond, scales typically as slowing down time.

  • HXR emission seems to follow bulk density recovery profile (slow response).

1.72

1.86

P. Sharma et al.


Conclusions 1 2000

  • The LHCD components of the CIMES project are now up & running

  • TH2103C 700kW/CW klystrons commercially available

  • PAM launcher showing initial excellent agreement with expectations

    • Coupling at long distance and in ELMy-like plasmas demonstrated

    • Easy commissioning

    • CD capability assessement planned early 2010

    • Full CD over 50s

    • Long pulse capability underway

    • 2.75MW/80s achieved

    • CW Power density limit still to be assessed (2011)

    • So far 25MW/m2limited by the capacity of old klystrons

    • > 30MW/m2 expected

  • You are welcome to join the Tore Supra experiments


Updates 2000

on the Conceptual Design Studies

of the ITER LHCD system

Tuong Hoang

for the contributors of the LH4IT Project Team

J.F. Artaud1, Y.S. Bae2, J. Belo3, G. Berger-By1, J.M. Bernard1, Ph. Cara1, A. Cardinali4, C. Castaldo4, S. Ceccuzzi4, R. Cesario4, J. Decker1, L. Delpech1, A. Ekedahl1, J.Garcia1, P. Garibaldi1, M. Goniche1, D. Guilhem1, C.Hamlyn-Harris5, J. Hillairet1, G.T. Hoang1, J. Hua6, Q.Y. Huang6, F. Imbeaux1, F. Kazarian5, S.H. Kim1, Y. Lausenaz1, R. Maggiora7, R. Magne1, L. Marfisi1, S. Meschino8, D. Milanesio7, F. Mirizzi4, W. Namkung9, L. Pajewski8, L. Panaccione8, Y. Peysson1, A. Saille1, G. Schettini8, M. Schneider1, P.K. Sharma1,10, O. Tudisco4, G. Vecchi8, S. R. Villari4, K. Vulliez1, Y. Wu6, Q. Zeng6


One year ago… 2000

  • Following Design Review conclusions, a 20 MW LHCD system for ITER under consideration for Steady-State Advanced Tokamak research and V.s saving issues.

  • Five ITER partners joining efforts to update the conceptual design: CN, EU (under EFDA), IN, KO, and US, on voluntary basis.



EFDA TASK HCD-03-01 ‘LH4IT’ 2000

Providing a pre-design document including the conceptual design, costing, possible procurement allocation, WBS, R&D needs

  • CEA (coordinator), ENEA, IST, POLITO, Univ. ROME 3, (CCFE, IPP-Prague, follow-up only)

  • With IO (HCD Department)

  • With International Fusion community support; China, India, Korea (test of 5GHz tube), US and Japan (follow-up only)


All the works planned in 2009 achieved
All the works planned in 2009 achieved 2000

  • Provide the ITER System Requirement Document, and Work Breakdown Structure

  • Study the Integration on ITER with IO, RAMI constraint (reliability, availability, maintainability, and inspectability)

  • Revise the Physics Design (absorption, propagation, alpha issue,…), incl. contribution to scenario development

  • Improve the initial DDD2001 conceptual design

    (antenna, TLs, PS, system control&protection + assoc. diagnostics)

  • Evaluate the cost andtentative planning


Role of lhcd in iter confirmed
Role of LHCD in ITER Confirmed 2000

  • Driving the far off-axis current, crucial for sustaining Steady-State

  • SavingVolt-seconds -> extend burn duration


Previous results on deposition confirmed

I 2000LH RAY-STAR

C3PO/LUKE

14MW absorbed

Propagating region for N//= 2

~26MW absorbed

Previous Results on Deposition Confirmed

  • Location of LH driven current @ r/a > 0.6

  • Best range of N//: 1.8 – 2.2, for all the scenarios, incl. the ramp-up phase

  • Expected pedestal parameters [ne = 0.6x 1020 m-3 and Te < 5 keV] are located well inside the propagating region for N//= 2


Lhcd extends burn duration

(d) 2000

(c)

(b)

(a)

LHCD Extends Burn Duration

Early application of LHCD (20MW) in the current ramp-up saves ~ 45Wb (mainly by heating, ~38 Wb), preserved to the end of burn

  • Decrease of li: li ≤ 0.3

  • All PF coil currents well within their limits

a,b,c,d: depending on the power + waveforms


Modification of ddd2001 pam proposed

1.5% 2000

@ 41018m-3

8%

@ 41018m-3

noc=3.1x1017 m-3

noc=3.1x1017 m-3

Modification of DDD2001 PAM proposed

  • 4-WG module (4A+4P WGs/MJ) to improve the flexibility:

    N// = 2 ± 0.2 (initial design: 8-WG module, N// = 2 ± 0.1)

  • Directivity very similar to DDD2001 design (70%)

  • Optimizing bi-junctions to reduce RC <1.5%, in a wide range of density up to 12 x nco

4A+4P WGs/MJ

DDD2001 PAM


Installation on iter
Installation on ITER 2000

2 x 48 RF windows (500kW/CW)

48 rectangular T-Lines maximum

(or 24 circular T-Lines)

48 Klystrons 500kW / CW

Foreseen distance between the klystrons and the launcher, could be reduced at about 40m

Port # 11


Antenna front face

DDD2001 2000

Case B

Case A

Antenna Front Face

  • Different models have been analyzed:

    • DDD2001 PAM model

    • 2 Alternative PAM models “Case A” and “Case B”

      (also alternative concept FAM)

  • Acceptable Surface Temperature(<650°C)for all designs

  • Better knowledge of the Be-Cu joint (HIP) needed

    -> mock-up required


Cw high power tests of the 500kw 5ghz klystron restarted
CW high-power tests of the 500kW /5GHz klystron restarted 2000

In Feb 2010 at NFRI, with new capability of the test stand. Participation of CEA.

460 kW/20s; ~300kW / CW @ VSWR=1.12

2010

2009

[Courtesy ofY.S. Bae]


An iter task agreement under preparation

This task is focussed on the design activity and will be divided in the following subtasks:

Definition of a development work plan.

Physics modeling to ensure physics requirement for LH H&CD.

Conceptual design analysis.

Definition of the R&D associated with the previous work plan.

Design process and drawings

The task will cover ~4 ppys over 2009/10.

The task issuing has been delayed due to the sudden death of A. Tanga.

An ITER Task Agreement under preparation


Conclusions 2 divided in the following subtasks:

  • The ITER LHCD Conceptual Design Activity is complete. Final Report to Contributors and IO has been delivered in April 2010

  • Physics Case, incl. contribution to Steady State Scenario Developments

  • Conceptual Design for PS, transmitter, TL and launcher available

  • Urgent R&D: 500kW CW windows, mode filters, front face (BeO)

  • Port and Transmitter Hall pre-allocation on ITER

  • EFDA will continue the Design effort over 2010 and encourage Procurement Package Discussions amongst contributors

  • ITER Task Agreement under preparation

  • focusing on the design activity (Voluntary Contribution to the ITER LHCD development plan’). The task will cover ~ 4 ppys over 2009/10

  • New LHCD systems are foreseen in EAST, HL-2M, KSTAR, SST1, AUG and FAST (?). Need consortium (?)


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