JAERI-Research—97-060 JAERI-Research JP9710018 97-060 1097^9)3 2 9-01 i Japan Atomic Energy Research Institute *°- Mi, T 319-11 (T319-11 $? This report is issued irregularly. Inquiries about availability of the reports should be addressed to Research Information Division, Department of Intellectual Resources, Japan Atomic Energy Research Institute, Tokai-rrura, Naka-gun, Ibaraki-ken, 319-11, Japan. © Japan Atomic Energy Research Institute, 1997 m JAERI-Research 97-060 h> mm IBS!) MeV MJ d© lMeV h U h > —old h U (LAND J T- nid«kt)Sci-FitfttfiS{i. 1. 2. SIdR^/jN^l.^ 3. S . 4. 2, 3, (SBD) DT (IOK) . h'J &I* h 'J h >O T-60U Jd% J T-60U(CT'J : T311-01 JAERI-Research 97-060 h'J MJ h- ^ tzo ttzn. -^©uncertainty©*: JAERI-Research 97-060 Triton Burnup Study Using Scintillating Fiber Detector on JT-60U Hideki HARANO* Department of Fusion Plasma Research Naka Fusion Research Establishment Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken (Received August 1, 1997) The DT fusion reactor cannot be realized without knowing how the fusion-produced 3.5 MeV a particles behave. The a particles' behavior can be simulated using the 1 MeV triton generated by the DD fusion reaction in the DD burning plasma. To see the triton burnup is one of the way to investi- gate the 1 MeV triton's behavior. In this study, for the triton burnup measurement at JT-60U, a new type of directional 14 Me V neutron detector, scintillating fiber (Sci-Fi) detector has been developed and installed on JT-60U in the cooperation with LANL as part of a US-Japan collaboration. The most remarkable feature of the Sci-Fi detector is that the plastic scintillating fibers are em- ployed for the neutron sensor head, which gives the following advantages, (1) the pointing ability to the DT neutron, (2) the gamma pulse height suppression, (3) the very fast operation and (4) the excellent durability against radiation. Various performance tests show that the Sci-Fi detector has an insufficient directivity of about ± 40~50° , however, due to the above (2-4) properties the Sci-Fi detector overcomes the problems of the Si semiconductor detector and the NE213 liquid scintillator which have been utilized for the triton burup study. The Sci-Fi detector measures and extracts the DT neutrons from the fusion radiation field in high time resolution (10ms) and wide dynamic range (3 decades). Triton burnup analysis code TBURN has been made in order to analyze the time evolution of DT neutron emission rate obtained by the Sci-Fi detector at JT-60U. The TBURN calculations repro- duced the measurements fairly well, and the validity of the calculation model that the slowing down of the 1 MeV triton was classical was confirmed. The Sci-Fi detector's directionality indicated the tendency that the DT neutron emission profile became more and more peaked with the time progress, which was qualitatively explained by the triton's slowing-down time. It has been predicted that the classical transport of the fast ion increases under the existence of Research Collaborator (University of Tokyo). the toroidal field ripple. Since JT-60U is a large tokamak experimental device which has the ripple amplitude of about 1 % at the plasma edge, the various research on the ripple transport has been carried out until now. In this study, in order to examine the effect of the toroidel field ripple on the triton burnup, R -scan and ne-scan experiments have been performed. The R -scan experiment indi- cates that the triton's transport was increased as the ripple amplitude over the triton became larger, which did not contradict detailed analysis with TBURN and three-dimensional orbit following Monte Carlo code OFMC. In the ne-scan experiment, the DT neutron emission showed the characteristic changes after the gas puffing injection. However, there was no performance on extracting informa- tion on the transport from these changes, for uncertainty of measured data. However it was con- firmed theoretically that the gas puffing was effective for the collisionality scan. Keywords: JT-60U, Nuclear Fusion, Scintillating Fiber, 14 MeV Neutron, Directional Neutron Detector, Triton Burnup, Alpha Particle Physics, Energetic Ion Transport, Classical Slowing Down Theory, Toroidal Field Ripple, OFMC Code iv JAERI-Research 97-060 i. ft m i 1. 1 (iirfel;: 1 1.2 h>) h >«j£W§£©lItt 6 1.3 JT-60U(Cfc{t^^ii-r^>W^©^^ 8 1. 4 ^WfSoBWi&ittttt 11 2. Sci-Fi&tiitg 13 2. 1 ftlJ&SCa 13 2. 2 fl: $ 16 2. 3 ttftgfitf* 22 2. 4 J T-60U^CD|Sfi 31 2. 5 *iJ6 51 3. h'J h>*RJ!ftJW*f3-KTBURN 52 a i «wa&&iii 52 3. 2 J^tfr^f^U 58 3. 3 m^^mt^m 76 3. 4 ttib —• 79 4. >j v^jim&nm so 4.i mm-(*><D-&Mwmm:£fiJi so 4. 2 % Ik 94 4.3 R,x3-+>nmtMtz>MVTt^m 100 4.4 n.x*+>Httfcttt-'5J!Wr£*£ 112 4. 5 ££tb 116 5. & H 117 m m ii9 x h 132 JAERI-Research 97-060 Contents 1. Introduction 1 1.1 Introduction 1 1.2 Overview of Triton Burnup Research 6 1.3 Status of Fast Ion Research on JT-60U 8 1.4 Purpose and Positioning of This Study 11 2. Sci-Fi Detector 13 2.1 Principle 13 2.2 Specification 16 2.3 Performance Tests 22 2.4 JT-60U Installation 31 2.5 Summary 51 3. Triton Burnup Analysis Code Tburn 52 3.1 Classical Slowing Down Theory 52 3.2 Analytical Model 58 3.3 Results and Discussions 76 3.4 Summary 79 4. Ripple Transport Experiment 80 4.1 Classical Transport Model of Fast Ion 80 4.2 Experiments 94 4.3 Analysis and Discussion for R -scan Experiment 100 4.4 Analysis and Discussion for ne-scan Experiment 112 4.5 Summary 116 5. Conclusion 117 Acknowledgements 119 References 120 Publication List 132 VI JAERI-Research 97-060 I . 1.1 tiU^tc ^« *^f^3I#Xyg^g JT-60U ^ffi DT MM^ * ;^-ii^ QDT ~ 1.05 *IB^[i] U >tf$> h o t fz 1991 %-11 ^ J: •) EC O JET (Joint European Torus) : PTE(Preliminary Tritium Experiment) Hi£ [2, 3] H^ci , T >* V * y V >X h >-fc¥-(O TFTR(Tokamak Fusion Test Reactor) "Cli 1993 ^ 12 ^ JiJl 800 y 3 7 h^±<7)DT7P9Xv||^^®r^L, ffl.2GJ *5 •? [4], S#J *S 9 ai^i^lll^^^ ITER(International Thermonuclear Experimental Reactor) fHffl& B^EkEC) 4 S1§^TT^i* t Jiff 4»"C*-6o ITER 3.5 Mev JAERI-Research 97-060 MHD lot, [5] , TFTR <7) DT i:io (-7° 7 *) (TAE ^ - K ^ fishbone (sawtoothmM) Ltz \a ITER t/S R&D £>M3c*S B <O—*3 K W h fl (PCX) [8, 9, 10, 11], 3. a-CHERS) [12, 13] <D 3 ji «9 [4] ~?--7°V-7(Y3A\5O12:Ce) Figure l.l(ilK [7] K frKX *) v >f- V- 9 -}L"?<r)®LWfe%k*%WLtz t t basement floor K 2 - JAERI-Research 97-060 Z>o 2. liLiXtiBCO^W h (~7 mm3) £ 500-700m/s 7 Xv *£(;:#•£,&&, *kttzfe%M (ablation cloud) i:T He2+ + (Li or B)° -+ He0 + (Li or B)2+ (1.1) #1 NPA(Neutral Particle Analyzer) NPA O^igl^ h%htl%> m m±ffiW&=i- (trapped particle) ^^O t <DKm.b tlZ> o ,R)S(l.l)OR)B^^M#^'b> Li^l^-7 h*fflV^^^H{i0.5-2.0MeV, B ^ l^ y r- <7)^^^ti 0.5-3.8MeV O$EfflC7)a 3S^**a!5©kt*fc f*Z>o t tz^ NPA i/ mmh 3. He2+ + D° -> He+* + D+ (1.2) zfe, n=4 -> n=3 H «t •) KtHit ^^ (He2+ 468.6 nm) *5o f&^^^^-flitT^l^^^SJS^^v^,:^, it (0.15-0.7MeV) (7)'lf #^1#f)tL^o Figure 1.2 {•%& [13] i ^Iffl) Ha-CHERS <T> JAERI-Research 97-060 TFTR Vacuum Vessel Center Line Cast shielding (or fiber bundles Quartz coherent fiber optic bundles Radiation Shielding Enclosure Detector Enclosure Basement Floor Figure 1.1. Overview of the layout of the TFTR escaping particle diagnostic, showing the locations of the principal components of the system. - 4 JAERI-Research 97-060 Figure 1.2. Equipment layout for the alpha-CHERS experiment in the TFTR hot cell. A, t^( Table 1.1 \z J*> W.W.Heidbrink b \Z tf i-|fei [14] 1.2 -e«i-€--5 ?t 1.3 T*fi JT-60U Table 1.1. Principal sources of fast ions. Source Physical Spatial Angular mechanism distribution distribution Fusion reactions Nuclear reactions Centrally peaked Nearly isotropic Neutral beam Charge exchange, Depends upon Anisotropic injection electron impact energy and (depends upon ionization line density injection angle) ICRF minority Cyclotron damping peaked near Anisotropic) heating resonance layer (perpendicular) - 5 - JAERI-Research 97-060 1.2 DD (->kKB) HiiJ^TO 2 d + d -+ 0.82 MeV 3He + 2.45 MeV n (1.3) -» 1.01 MeV t + 3.02 MeV p (1.4) (1.3) CT 2.5MeV ^14^ (DD Kfc (1.4) H «£ «J lMeV h 'J 1.3) fc (1.4) / ^^ U < . DD^±=f-t lMeV h U h > DD * > to? -u >; h v\± 200keV ®Lt-?ft&tZ> t Figure 3.U\Z^Ltz X n \Z DT d + t-^ 3.56 MeV a + 14.03 MeV n (1.5) 14MeV f^ttT (DT 'j h >m^t^^o itz, DD tt DT >, Y V h U 1 MeV h 'J h 3.5 MeV 3.5 MeV Jft > DD DT DD > (Eth = 0.5MeV), DT 63 62 Cu(n, 2n) Cu (Eth = 11.9MeV) DD - 6 - JAERI-Research 97-060 DT 4>14i^*fr LTti Si ^Sft^tb^ (SBD) * NE213 tlTV^0 PLT[57] ur MHD JET[15, 54,16], DIII-D[32], JT-60U[45] KXM&WKm^btltZo $&%&%:& JET[16] JET[16] Wf'-^liStJiltra^^^ (~2s) [87, 75, 17, 105] W3LKm\<*htl, MHD T PLT[87, 57], FT[18, 19, 20, 21, 22], TFTR[23, 24], DIII-D[32], JT-60U[45], JET[25, 15, 54, 16, 26, 27, 28, 29, 105] iZ& 1 o -^ JET -eti DD ^14^fc DT ^tt ?-O^K^^36^|£tS:^&«:#m L , &btitz&M&&\i V >; h >iitt$^ DT [30] (i#^L-CV^o J^, FX[19], TFTR[23], DIII-D[32] , MHD i^h U b >Btib*MLXMllD]gW}tfY ]) Y y(DW£K5-lZ>&WtfM^btlX^2>o PLT[87] t?li sawtooth [,] 'J [22, 31]o fa\Z i> JET[29] "Ctt sawtooth H^B#H DT JAERI-Research 97-060 t &||$lj Uv^o itz DIII-D X*\t TAE •=£- K [32] , h U h ^j^ •; ^ 1.3 JT-60U JT-60U Table 1.2K Sia*r Figure 1.3 x 10-6Pa zmW:2titz 18 36MW) ^ (RF, ^5Ji>f t > {Y U h >^h') ^ li, 1.