Updates and Status of HCD Physics
Assessments, Actuator Design andCode Developments
T. Oikawa (ITER Organization)with contributions fromK. Kajiwara2, K. Takahashi2,K. Tani1, K. Shinohara2, T. Sugie2, Y. Kusama2,
1Nihon Advanced Technology, 2JAEA	

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 1EC Equatorial Launcher (EL) (1)	•••••BSM opening narrowed to avoid neutron to directly strike waveguides.
Single mirror -> focus mirror + steering mirror
Steering mirror moved back by ~10cm to arrange cooling pipes
Ctr. injection by the mid steering mirror
Beam waist ~1m at the 2010 design unacceptable for physics objectives.

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 2EC Equatorial Launcher (EL) (2)	• JAEA provides a new design obtained by engineering
optimization but with an attention to a physics requirement(narrow beam waist).
• For each of top, mid and bottom steering mirrors, 1/e beamwidth of 8 beams at vacuum resonant location ~ 0.2 m.
• Toroidal steering angle : 20 – 42 degree• Poloidal angles fixed at -5, 0 and 5 degrees for top, mid andbottom rows.

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 3

EC Equatorial Launcher (EL) (3)	& ''  


• Inj. parameters from EL mainframe at y=8980mm given.
      

   

 !







 "#     ! " $%  "#     ! " $% 

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 4

EC Equatorial Launcher (EL) (4)	••••Lower unit	

At present, parameters given only for toroidal angles of 20 and 40 degrees.
Linear interpolation/extrapolation will give a proper approximation for
20-42 degrees.
Physics and engineering optimization is still in progress, which may leadto changes in fixed poloidal angles and the toroidal steering range.
A revised summary document will be distributed to ITPA IOS soon.	

x0 [mm]	

y0 [mm]	

z0 [mm]	

l	m	n	

wx0 [mm]	

dx0 [mm]	

wz0 [mm]	

dz0 [mm]	

theta [degree]	

40 deg	

1	1119.610433	

8980	

53.13302736	 -0.604113718	 -0.794962906	

0.055503101	

17.85953468	 -1527.110953	

16.53389297	 -1369.572924	

-9.09 		

2	1140.125893	

8980	

54.73908313	 -0.639093401	 -0.767106364	

0.055744507	

16.69414513	 -1371.350349	

16.83457171	 -1332.553397	

42.62 		

3	1190.842457	

8980	

55.57435217	 -0.669260119	 -0.740916076	

0.055984477	

16.15861412	 -1269.604455	

16.80787565	 -1239.683828	

11.25 		

4	1127.351405	

8980	

21.78839492	 -0.620501091	 -0.778391366	

0.095316719	

17.65978131	 -1487.853342	

16.4591104	-7.13 		

5	

1161.803223	

8980	

19.83172724	 -0.652699679	 -0.751433854	

0.096593437	

16.4062849	 -1314.763412	

16.52399217	 -1242.472654	

8.00 		

6	1115.008038	

8980	 -17.41449528	

-0.59917352	 -0.789628217	

0.132205794	

18.39156461	 -1568.500263	

16.46186629	 -1347.818306	

-0.76 		7	1136.100204	

8980	 -20.56916531	 -0.633908646	 -0.761563274	

0.134837714	

17.00884944	 -1403.874925	

16.5903498	 -1295.306379	

-18.79 		

8	

1186.610669	

8980	 -27.52426427	 -0.663744773	

0.136963522	

16.19786325	 -1269.288482	

16.71433521	 -1231.092013	

-0.73531209	

-1313.2038		

-2.97 		20 deg	1	

1299.239307	

8980	

42.4324563	 -0.296638095	 -0.954136564	

0.040364071	

19.8166752	

20.0058936	 -1656.429436	

49.28 		

2	1320.725298	

8980	

43.94530122	 -0.339118132	 -0.939821212	

0.041653112	

20.0785088	 -1673.956861	

20.2380714	

-1608.86811	

18.62 		

3	1365.408454	

8980	

44.90057135	 -0.376522816	 -0.925416383	

0.042837908	

23.1443686	 -1871.138648	

20.80884794	 -1606.203946	

-9.37 		4	1307.157753	

8980	

7.224751785	 -0.316996057	 -0.944976586	

0.080825441	

20.09484267	 -1681.856989	

19.92539045	 -1606.143199	

16.99 		

5	1339.316029	

8980	

5.636476443	 -0.356542805	 -0.930576239	

0.083096878	

20.37331581	 -1684.376403	

20.33956315	

-1576.52687	

5.68 		

6	1293.432539	

8980	 -35.71635961	

-0.29236055	

-0.94908677	

0.117301374	

20.09114206	 -1691.621189	

19.98602122	 -1647.458733	

-3.26 		7	1315.300046	

8980	 -38.69150722	 -0.334639647	

-0.93454733	

0.120985926	

20.09597691	 -1664.993512	

20.55238479	 -1638.671104	

-3.14 		

8	1359.641981	

8980	 -44.26353235	 -0.371719192	 -0.920017906	

0.124064079	

22.17598227	 -1823.627894	

21.64773518	 -1663.910771	

-7.42 	

7th ITPA IOS at Seoul, 18-21/Oct/2011-1669.54079	

Page 5

ELM coils impact on NBI fast ion loss (1)	• n=4 Magnetic field by ELM mitigation coils (EMCs)

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 6

ELM coils impact on NBI fast ion loss (2)	•••"Loss of NBI fast ions due to EMCs in the former “Scenario4”.
#$%&'(" )" *+,('" -+.." /'012$+3" 0." 0" /&312$+3" +/" 2$4(" .10-("The peak heatload near the upper ELM coils is as high as 1.0-1.5 MW/m2.
(35031(4(32"60'04(2('" f . "If EMC field rotates, the heat load will be averaged among the 9 ELM coil
2.
Table 3peak
Loss of heatalpha particles
the ELMmitigation fieldITER
sectors. Theload duecanto bemitigatedto ~in 0.2-0.25MW/m
sbs"Case

NB1
NB2
NB3
NB4
NB5
NB6
NB7
NB8

TF-ripple ELM& TBM coils

on
on
offon
on
on
on
on

offon
on
on
on
on
on
on

EMC (ELM mitigation coil) field
Power
Number of Coil Maximum EMC
nloss(toroidal coils in current field at point B fraction
each
opti- in figure 2 (%)
mode(%)
number) toroidal mizatio BR/Bt BM/Bt

44
4
423
99998
999on
on

off
off
off
off
off

0.36
0.36
0.36
0.37
0.36
0.28
0.220.24
0.24
0.24
0.33
0.22
0.18
0.20

0.2
16.8
16.5
15.2
6.5
1.5
0.6
0.3

Fractionof loss
bananaparticles
(%)
75.4
46.7
46.2
46.9
49.3
61.7
75.9
74.5

Coil current optimization on: The upper and lower current phases are shifted by -12.4 deg. and -3.4 deg. respect
Coil current optimization off: The current phases are not shifted.
NB5 : The result for n=4 with 8 ELM coils in each toroidal row. The coil current was reduced to about f
one-half of the 9-coil system so that the Fourie components of n=4 would approximately equal
the level of the 9-coil system.

By K.Tani et al., submitted to NF

ITPA IOS
at Seoul,
18-21/Oct/2011
The results of the7th
numerical
studiesare summarizedin table 3. In the case of “NB1”, theEMC field was switched off. As described in Section 2, an approximate EMC field of n=4 isproduced by tuning the current phases of 9 coils in each toroidal row. In the cases of “NB2” andPage 7

ELM coils impact on NBI fast ion loss (3)	• An ITER contract on assessments for H-mode scenarios starts
this year (15MA inductive, hybrid, 9MA SS and He-plasmascenarios), and its result will be given in May~June, 2012.
• ITPA EP group has defined a benchmark coordinated byK.Taina (Univ. Helsinki) with contributions from Shinohara/
Tani (JAEA), Konovalov (Kurchatov), etc.

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 8

H&CD Code Developments (1)	•The new analytic OFMC scheme reported at the 5th ITPA IOS (Seoul,Korea, Oct/2010) has been updated to resolve a discrepancy near the axis
with the conventional OFMC code F3D-OFMC.
Now good agreement in the entire regime.

Beam driven current jφ (A/m2	)•New OFMC	
Conventional OFMC (w/ FBW effect)	
Conventional OFMC (w/o FBW effect)	

Old results 2010/11	

New results
2011/07	

ψ/ψa	

ψ/ψa	

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 9

H&CD Code Developments (2)	•The new analytic OFMC code gives ~5% larger values for the total
driven fast ion current and NBCD. Need to check if this isaccountable with Monte-Carlo statistical uncertainty.
Old results
ConventionalOFMC

w/o F.B.W effectw/ F.B.W effect

New OFMC

New results
Conventional
OFMC
New OFMC

w/o F.B.W effectw/ F.B.W effectBeam current

Beam-driven current

3.31MA
3.59MA

2.34MA
2.54MA

3.84MA

2.70MA

Beam current

Beam-driven current

3.43MA

2.44MA

3.61MA

2.56MA

F.B.W. : finite banana width

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 10

H&CD Code Developments (3)	• Profiles of power depositions to plasma species now in goodagreement.

Power	  (W/m3)	

Old results 2010/11	

Solid curves: new OFMCOpen circles: conventional OFMC	

to	  E	○○○	 to	  D	○○○	 to	  T	○○○	 to	  Imp.(O)	

New results 2011/07	
to	  E	○○○	 to	  D	○○○	 to	  T	○○○	 to	  Imp.(O)	

○○○	○○○	

ψ/ψa	

ψ/ψa	

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 11

H&CD Code Developments (4)	•The acceleration rate against the conventional OFMC is improved from 72
to 174 (tested on Fujitsu PRIMERGY RX600S4 (117GFLOPS/Core) for theformer “ITER Scenario 4” with 3,000 test particles, using 4 cores).
Old results
Conventional
OFMC
New OFMC

New results
Conventional
OFMC
New OFMC

Wall clock time14510.8 s
200.5 s(Acceleration=72.4)
Wall clock time7909.4 s
45.4 s(Acceleration=174.2)

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 12

Summary•

Now injection geometry of EC-EL with ctr-injection can be provided.
But be noted that this is still a temporary design. The IO/POP will try
to provide revised information at proper occasions.

•The EMC field can cause a non-negligible FW heat load. Assessmentsof ELM coil effects on fast ion confinement are in progress or willstart soon in the ITPA EP frame and an ITER task.

•Code developments :- Analytic OFMC solver improved both in accuracy andcomputational time against the conventional OFMC scheme.
- Tests of ICRF H&CD module (TASK/WMF) in work.

7th ITPA IOS at Seoul, 18-21/Oct/2011

Page 13