H-beam
Contents
1. Figure 4 10 i enter expansion establish begin and charge Ai meen PPS Obtain output number of exchange file JPUONS file names processing choices loops required Vv copy input repeat parameters to gt temporary file for vabndin use cycle on off switches gt Output passing sort population call bundle n files and beamf lt break down lt population lt stopping file end for passing model v2bndIn files Interactive parameter comments The program which makes use of data from archived ADAS data sets initiates an interactive dialogue with the user in three parts namely input data file selection entry of user data and disposition of output The primary calculations may be conducted in foreground or background Move to the directory in which you wish the ADAS created files to appear These include the output text file produced after executing any ADAS program paper txt is the default and up to four further output data files There is no graphical output from this program Initiate ADAS310 from the program selection menus in the usual manner The file selection window appears first as illustrated below 1 At a enter the beam species H for hydrogen and its isotopes and the atomic charge of the beam species Only data for neutral beam species is present in the central ADAS database at this time 2 There are two data files to be selec2. N IN N NEP N ta No ae determines the effective charge for the single impurity and its number density 4 10 17 The beam stopping coefficient is the collisional radiative ionisation coefficient However there is sometimes confusion about its definition Although hydrogen nuclei impact ionisation and charge transfer are the most efficient reactions causing beam stopping it is usual in fusion to define the stopping coefficient with respect to the electron density Thus the stopping rate cm s is N N S with N g the neutral beam density For ADAS310 this applies even if the stopping is calculated for the case of a pure impurity with all the free electrons contributed by the impurity in charge balance Thus for a pure impurity of number density NV and nuclear charge Z with effective mi A I I ionisation coefficient S T the stopping rate is N NS and SO S Z ADAS User manual Chap4 10 17 March 2003 Population results and preparing tabulations ADAS 310 is too slow in execution for a direct link to inter pulse experiment analvsis and so it is used to prepare tabulations of effective beam stopping and beam emission coefficients for subsequent look up The effective coefficients are most sensitive to the beam particle energy and the plasma ion density and less sensitive to plasma ion temperature and Z effective Suitable tabulations can therefore be built on areference set of plasma and beam conditions a two dimensional arra
3. irlen of relerenze densities 17 The multiple impurity choice enables us to investigate the influence of an impurity mixture on the stopping with greater precision Edit in the fractions you wish in the usual manner Note that the impurity density acts non linearly in the stopping coefficient and so the linear superposition implied by the use of ADAS304 is imprecise It is however very fast which is necessary in large scale experimental data analysis ADAS User manual Chap4 10 17 March 2003 ADASS 10 PROCESSING OPTIONS Select which paramsters te display Geneva Bwitches 1 3 Suitubesd TE Please antec the followley paramotor switeleza kritiwabm im kapart crow mectinns YES Delta N range far ion impurt crose sectiens i Use Loy im impart cress sections ves ju defmilta tu Wasnshteim i sertimzaj lis bae energy in famiy ien rrras sentiara VES Select tahle for display Select tahla for display s Brpe sentatise M shell Eleiiranjpratan Lempo altirt gear gt F i ba mey BIH Enter limita im H abella manragamtativa W aballa Kinison W kall 8 TE ki i a UMNEE Bean energy 5 Haximm t a ell iii F 1 BIE ED Bom cnergy mom valeny uate Yy amm ted Hare i a Edit Table The first representative Edit Table AT H mhelll im wet equal tu z he minime M shell Claar Tahla Enter bean dimsitr oH 10 18 At d the choice of plasma and beam parameters for the scans are made Click on the approp
4. 8243E 04 5 39216E 00 5 39216E 00 1 13446E 13 2 12 2 66749E 06 00151E 00 2 88629E 04 3 72541E 00 3 72541E 00 1 35010E 13 3 15 6 45607E 05 00036E400 4 69556E 03 65733E 00 65733E 00 2 10952E 13 4 20 9 49494E 04 00005E 00 5 01251E 02 09648E 00 09648E 00 3 75024E 13 5 30 1 10830E 04 00001E 00 5 29440E 01 01126E 00 01126E 00 8 43800E 13 6 40 2 32656E 03 00000E 00 1 07290E 01 00236E 00 00236E 00 1 50009E 12 7 50 6 76789E 02 00000E 00 3 06759E 00 00069E 00 00069E 00 2 34388E 12 8 60 2 38809E 02 00000E 00 1 07145E 00 00024E 00 00024E 00 3 37519E 12 9 70 9 29529E401 00000E 00 4 13889E 01 00009E 00 00009E 00 4 59401E 12 20 80 3 58867E 01 00000E 00 1 58384E 01 00004E 00 00004E 00 6 00034E 12 21 90 1 07020E 01 00000E 00 4 61460E 02 00001E400 00001E 00 7 59418E 12 22 100 1 50137E 00 00000E 00 8 06097E 03 9 99998E 01 9 99998E 01 9 37553E 12 BN F1 N1 N F2 F3 NH NE NI POPULATION OF GROUND STATE OF ION N POPULATION OF GROUND STATE OF NEXT IONISATION STAGE NN POPULATION OF PRINCIPAL QUANTUM SHELL N OF ION BN SAHA BOLTZMANN FACTOR FOR PRINCIPAL QUANTUM SHELL N EH NEUTRAL HYDROGEN BEAM ENERGY W RADIATION DILUTION FACTOR Z0 NUCLEAR CHARGE Zl ION CHARGE 1 NIP 0 INTD 3 IPRS 1 ILOW 1 IONIP 1 NIONIP 2 ILPRS 1 IVDISP 1 ZEFF 4 0 TS 1 00D 08 W 0 00D 00 CION 1 0 CPY 1 0 Wl 1 00D 08 ZIMP 4 0 ADAS User manual Chap4 10 17 March 2003
5. ADAS310 Beam emission spectroscopv process beam stopping and emission H beam The program calculates the excited population structure effective ionisation and recombination coefficients of hydrogen atoms or hydrogenic ions in an impure plasma A very many n shell bundle n approximation is used The hydrogen atoms may be part of the thermal plasma or may be in a beam The latter case is the only one of relevance for this manual however the full flexibility of the program has been retained Background theory For hydrogen or hydrogenic ions in a plasma the largest collision cross sections are those for which n n and l l 1 For these cases the transition energy is nearly zero and the cross sections are so large for electron and ion densities of relevance for fusion that it is very good approximation to assume relative statistical population for the l states Thus for hydrogenic systems only populations of complete n shells need be evaluated the bundle n approximation The equilibrium populations of the n shells Nj are the solution of the statistical balance equations Y LA U V B T Nog NIN Y UV Byrn ia Ng T NIN n lt n NN a N N a NN Ju v B dK uV Bron Nig Nail n gt n 4 10 1 VIAL an u V B pn Ni i sa Nog a u V B dk N g2 Ng dN 27 n and N of the parent ion X N is the free electron p N is the population of the state X density and N p the free proton de
6. TED ADAS User manual Chap4 10 17 March 2003 Illustration Table 4 10a EFFECTIVE CONTRIBUTION TABLE FOR ION PRINCIPAL QUANTUM SHELL POPULATIONS IN THERMAL PLASMA HYDROGEN Z0 1 00E 00 Z1 1 00E 00 TRAD 1 00E 08 K TE 5 80E 07 K TP 5 80E 07 K W 0 00E 00 NE 1 00E 12 CM 3 NP 0 00E 00 CM 3 EH 5 00E 03 EV AMU NH 1 00E 06 CM 3 NH NE 1 00E 06 FLUX 9 78E 13 CM 2 SEC 1 CHARGE EXCHANGE OFF N1 N 3 96967E 10 RECOMB COEFF 3 98614E 17 CM 3 SEC 1 IONIZ COEFF 1 00415E 07 CM 3 SEC CHARGE EXCHANGE ON N1 N 1 01033E 06 RECOMB COEFF 1 01452E 13 CM 3 SEC 1 IONIZ COEFF 1 00415E 07 CM 3 SEC I N F1 F2 F3 B CHECK B ACTUAL NN BN N 1 0 00000E 00 4 22257E 05 1 07427E 15 07472E 09 07472E 09 9 40109E 16 2 2 9 03269E 09 3 77642E 00 1 90419E 09 10339E 04 10339E 04 3 75276E 15 3 3 3 27110E 09 2 50566E 00 3 72697E 08 3 68009E 03 3 68009E 03 8 44053E 15 4 4 1 38276E409 72873E400 8 89060E 07 48767E 03 48767E 03 1 50034E 14 5 5 4 65572E 08 25911E 00 1 96737E 07 4 91313E 02 4 91313E 02 2 34414E 14 6 6 1 55704E408 08781E 00 4 77562E 06 63175E 02 63175E 02 3 37545E 14 7 7 5 87510E 07 03338E 00 1 41410E 06 6 18052E 01 6 18052E 01 4 59426E 14 8 8 2 50081E 07 01425E400 4 92186E 05 2 67728E 01 2 67728E 01 6 00059E 14 9 9 1 20056E 07 00684E 00 1 98482E 05 33349E 01 33349E 01 7 59443E 14 0 10 6 55794E 06 00373E 00 9 26893E 04 7 72209E 00 7 72209E 00 9 37578E 14 1 dl 4 29257E 06 00244E 00 5 2
7. ady exists and the Append or Replace button has not been activated ADAS User manual Chap4 10 17 March 2003 ADAS310 OUTPUT OPTIONS Title for rum ADAS User manual example 23 24 Cancel Run Now W Rum Summary Output Replace Default File Nane File Name adas310 paper txt First Passing File Replace Default File Name File Name adas310 idata passl _ Second Passing File _ Xeviace Be azit File Name File Name ji Third Passing File J Replace Bofauit Pile Name File Name B Fourth Passing File Replace Default File Nane File Name adas310 data pass4 Four additional passing files may be produced which are placed in your pass directory The first passing file is of ADAS data format ADF26 and contains line printer formatted pages of data one page for each individual population structure case run The data held on these sheets is very comprehensive By appropriate choice of the parameters mentioned in the processing section above and choice of input files hydrogen in all its possible conditions in a fusion plasma can be obtained beam and non beam Click the Run Now button to initiate the calculations These are run in fore ground since they are of fairly modest duration A thermometer widget illustrated below keeps you informed of the progress of the calculations ADAS310 INFORMATION ADAS310 CALCULATIONS UNDERWAY _ PLEASE WAIT PROCESSING 35 COMPLE
8. ata acquisition under the following classes class returned data source electron excit excit amp dexcit maxwellian specific ion files adf04 rate coefficients bundle n form electron ions ionis maxwellian szd files adf07 rate coefficient ADAS User manual Chap4 10 17 March 2003 proton excit excit amp dexcit displaced sia h files adf02 maxwell rate coefficients proton ionis ionis displaced sia h files adf02 maxwell rate coefficient impurity excit excit amp dexcit displaced sia h files adf02 maxwell rate coefficients impurity ionis ionis displaced sia h files adf02 maxwell rate coefficient The supplementary data is introduced for example as an effective P factor P y q QV Metcay 4 10 16 Iy kT Uy AE fin 1EXP AE n kT for excitation which replaces the moderate accuracy formulaic value if available For the hydrogenic ion as a plasma species state selective charge exchange recombination data to excited levels for hydrogen donors may be included and these data are accessed directly from the appropriate file adf0 Distinctions in analysis for hydrogen in beam or plasma The program can apply to hydrogen atoms in a thermal plasma or to hydrogen atoms in a beam The practical distinction is made by the assignment of a translational velocity for beam atoms This velocity is incorporated in the integrals of beam particle plasma particle cross sections over the Maxwellian distributi
9. e is still requested Approximations for collision cross sections Internal routines calculate default values for electron and ion impact excitation and ionisation in a number of approximations For electron impact excitation between nearby n shells An lt m 2 the impact parameter approximation Burgess and Summers 1976 is used The order of the quadrature over the cross section to produce the rate coefficients may be altered but the highest precision is generally used For An gt m the formulae of Percival and Richard 1970 are available or the simpler Van Regemorter 1962 approximation may be used For ion impact excitation cross sections are included for An lt m 2 with the expressions of Lodge et al 1976 or Vainshtein as alternatives Supplementary precision data The general purpose routines described above are satisfactory for generating collision cross section data at moderate accuracy for the very many n shell atom population structure However the precision may be improved for excitation ionisation and charge transfer involving the ground level and possibly other low n shells Such improvement is particularly important for beam stopping coefficients and active or passive Lyman and Balmer line spectroscopy Systematic improvement is implemented by drawing on the ADAS ion atom and ion electron collision database A supplementation subroutine SUPPHI for H HD which is subject to periodic adjustment executes the d
10. mation sub window is shown below There are two modes of operation Single impurity or Multiple impurities Click the drop down list button to make your choice 16 The single impurity case has only one impurity nucleus in addition to protons present in the plasma The single impurity case is used to build up such data sets in adf2 Note how the impurity and protons fit together equations 4 10 16 and 4 10 17 in the ADAS User Manual The proton and electron density choices to be made next influence this ADAS User manual Chap4 10 17 March 2003 AQAZZIO AiG OPTIONS Select which paramsterce te display Generel ja fwibchas 1 Gwitrbesd TE Please anter the following paramotor switches Delta M range for impact parameter cross sections kan wale f al Imtegral onder af irparl pareester Erari sections ft kan value ef AJ lum Percival fochards crowe sectione z N ISD dafmiltu to van Begemarter X mnctions Atum mperial lew level cross section data g ves Select table for display Select tahla for display jEmmribr information im Elartranjpratan deity scan Brjir ientatise h shel le J Elertranypratian temperature sean Enter limite on M a ellat pawragantativa id aballa Kimim Hatha 1 i J Electronfproton densities fumite cm j ae d i ET je Electra deity Protua density Hate The first representative Edit Tabl i FI i shall a ont L ia d RT Edit Tabla Clear Tabla clear Table Ester
11. nsity A and B are the usual Einstein coefficients q and q r and a denote radiative and three body recombination and u V is the energy density of the radiation field There is one such equation for denotes collisional rates due to electrons and protons amp each value of n from 1 to The equations may be extended by including reactions for other impurity ions additional to the protons The radiation field presence in the equations is not of direct relevance to hydrogen population modelling in a fusion plasma but it can be exploited in a purely technical manner to separate the influence of different driving populations in the collisional radiative sense Gaunt factors It is convenient to express the coefficients in terms of Gaunt factors Thus l6a c a RA A fa n lt n 4 10 2 3 31a Jn n n n and the Einstein B coefficients are given by 2 Brow Arse B B 4 10 3 3 n gt n 12 n gt n C n where v z ly h 1 n 1 n is the frequency of the n n photon With a Planck radiation field of energy density u V at temperature T and dilution W the photo excitation rate coefficient is given by 16e Wz 8h U V B i 33TA The stimulated emission rate coefficient is given by exp hv kT 1 4 10 4 nn n n p 2 ADAS User manual Chap4 10 17 March 2003 1 4 W ia 6 c Zo En exp hv kT 1 4 10 5 33TA The ADAS library contains subro
12. ons in the thermal plasma For hydrogen forming part of the thermal plasma the translational velocity is set to zero In the latter circumstance ion impact collision rates are very small compared with electron impact rates Also recombination both free electron capture and charge exchange capture become significant processes For the hydrogen atoms in a fast beam recombination is not relevant and although formally present is ignored in the results However the translational velocity can make ion impact collisions more important than electron collisions Multiple impurities and Z In general several impurity species nuclei may be involved in collisionally inducing transitions Of these the hydrogen nuclei are often the most important and because of better availability of data and approximations for proton induced rates the protons are usually treated as a special plasma species and the other species treated as the impurities Let the electron and proton number densities be M and N p Tespectivelv Let the set of impurities charges and fractions by number be 1277 o ji sia i 1 1 then the total impurity number density Zer and component impurity number densities are I Nine N NM rei aki i l I Epa NNO OL Gey Ee iN 4 10 16 i l Nin FERNI In the case of single impurity which is frequently used as a single effective impurity it is convenient to alter the definitions Taking N N and Z as prescribed zim Zag Ne
13. owse Comments button displavs anv information stored in the selected charge exchange data file It is important to use this facility to find out what is broadly available in the data set The possibility of browsing the comments appears in the subsequent main window also 10 Clicking the Done button moves you forward to the next window Clicking the Cancel button takes you back to the previous window The processing options window has the appearance shown below ADAS User manual Chap4 10 17 March 2003 11 The various control parameters of the collisional radiative population calculation are organised into three groups selected in turn bv the buttons General Switches I and Switches II These cause the appropriate set of parameters to be displayed at b The default settings are reasonable and they can be ignored as long as only beam stopping is the intent ADAS310 PROCESSING OPTIONS Select which paramere te display deneral Beitches 1 Suitubesd TE Please antec tla following parcamobors ardiatiem finid teeperature uF 3 li BENEM j iad for dnfmitj General radiabtiam Hald dilution i li Dee flack fur default Baltiplier for immizatlan rrrar sertidra li 1 mWEem flank fur defali Baltaplase fur eqerartar rrras surtidra li 1 mWEesm pak fur dnfmitj Tsmiximq ra iatimm field iletim i l 1 MWEs flack for dnfaltj Bam specion imtopa mara 1a Blak fur defmiltj Select table for display Select tahla for dis
14. play inpmrity imformatim m Electran proten deity man Beprodentalive il dleiili Eletlrenpratan Lempo altire oar P hsm mey BC Falisi pede aprii MMuli la ime tias E Electron proton densities jumifx cm 3 ultiple impurities total traction must be lt 1 0 T REL Elentir demai Proton densi lex Srmhal Kbir Fraction F 1 z ass mi l t 1 H 1 8 nn z 12 0 0 700 E a 11 0 0 0400 Edit Tabla Edit Tabla Clear Table Bater iirelem of peterance densities 12 Switches I allow some choices to do with electron collision cross sections and Switches II allow some choices to do with ion collision cross sections see the corresponding sub window inserts below Make sure that Access to low level data is chosen at a and Use beam energy informing cross sections at b It is this latter piece of information that informs the calculation that the neutral hydrogen is in the beam and not in the plasma 13 The choices at c above must then be made Click the Impurity information or Representative N shell buttons The appropriate sub window is displayed at c 14 The representative N shells requires specification of the lowest N shell Highest N shell and a set of sensibly spaced representative N shells spanning the range Make sure the lowest is for hydrogen Make the highest around 110 and use about 20 representative levels Use all levels up to N 10 and then start to space more widely 15 The Impurity infor
15. riate button to work on each scan in turn Note that you edit in a set of values and then choose one to be the reference value of that parameter The table may be edited by clicking on the Edit Table button The ADAS Table Editor window is then presented with the same set of editing operations available as are described in bulletin nov 8 94 Values should be monotonic increasing It has proved helpful to add a Clear Table button to remove all entries in the output field 19 Note that a neutral hydrogen density in the beam is requested This is necessary to allow a mathematical separation of the various influences on the neutral hydrogen population structure and is not an experimental beam density A value of order 10 or greater is suitable for the program operation 20 Clicking the Done button causes the output options window to be displayed Remember that Cancel takes you back to the previous window The output options window is shown below 21 It follows the usual pattern except that there is no graphical output 22 The Run Summary is given in the output file specified at a The Run Summary Output button activates writing to a text output file The file name may be entered in the editable File name box when Run Summary Output is on If the file already exits a choice to Replace or Append may be made The default file name paper txt may be set by pressing the button Default file name A pop up window issues a warning if the file alre
16. rposes The de excitation rate for hydrogenic ions by electrons is ie eee nn Biri l ly kan B 3 n n z KAT 1 2 l P AE a IKT 4 10 9 for n gt n and the excitation rate is ee 95 a nin Bove l Tg a 3 n n z KT exp AE kT P AE KT Particularly simple expressions for P are given by Van Regemorter In general an effective P factor is deduced from more complex collision cross section calculations or experimental cross section measurements similar formulation may be used for proton collision rates The electron collisional ionisation rate coefficient may be described by 4 10 10 1 2 I 2 q2 sVracai 2 l exp I kT e 0 4 10 11 f Gexpl Dd and the three bodv recombination coefficient bv ADAS User manual Chap4 10 17 March 2003 2 I ar a za aca LL Gexp ag 4 10 12 kT Zo 0 with E W I 1 kT and W 1 1 W 1 l b at in the Exchange Classical Impact Parameter ECIP approximation IP is the impact parameter part b factors and scaling It is convenient to rewrite the statistical balance equations in terms of the deviations of the populations from those which would occur in thermodynamic equilibrium The deviation b is defined by 1 zia W 1 37 W 4 10 13 Taol y e 3 2 N NN n exp I kT b 4 10 14 Also it is convenient to introduce c b 1 and scaled temperatures and densities kT 1 kT 1 5 IT ma N t g
17. s data sets mapping from the adf09 data type into the adf04 data type We shall deal with the purposes of these in the discussion of advanced population modelling in the next release For the moment note that bndlen_exp h0 dat is the one needed here and it sits alone as shown in the illustration Always select it The charge exchange file is selected at c Again this is not of importance for neutral beam stopping The charge exchange data set is required when hydrogen nuclei can act as electron receivers from other species You will see no effect of your selection here on the beam stopping coefficient but the selection is kept in for the future Once a charge exchange data file is selected the set of buttons at the bottom of the main window become active Chap4 10 17 March 2003 ADAS 310 INPUT Please enter beam species details Beam species element symbol H Beam species ion charge 0 0 Expansion File Details Data Root packages adas adas adtis Central Data User Data Edit Path Name p310_a17 bndlen_exp h0 dat Data File bndlen_exp h0 dat Charge Exchange File Details Data Root packaqes adas adas adiGis Central Data User Data Edit Path Name iqexth0 qexth0 e2pthi dat Data File qcxthi e2pthi dat qexth0 e2sthi dat qexth0 en2 kvitb5 dat qexth0 en2 kvitbed dat Edit the processing options data and press Done to proceed Browse Comments Cancel Done 9 Clicking on the Br
18. t t gt and Pe 2 3 a 4 10 15 ly I Zo 3 a zo Zo with similar forms for the proton temperature and density In these terms the statistical balance equations become particularly suitable for calculation Solution of the collisional radiative equations The general solution of the statistical balance equations to obtain collisional radiative coefficients and populations is described in detail in the description of ADAS208 The methods of condensation projection and expansion which give flexibility in the treatment of metastables and in the merging of low resolution and high resolution population models are also described there For the case of hydrogen in beams entering fusion plasmas the bundle n level of resolution is appropriate for all n shells subject to refinements described below of the key transitions provided the interest is in beam stopping and integral beam emission Nonetheless observations show that principal quantum shell radiative transitions by beam atoms are spectrally resolved into motional Stark multiplets Using the methods of projection and expansion the bundle n solution can be expanded over low n shell Stark manifolds for a fuller study ADAS310 has some capability for supporting such studies which it does by accessing an expansion definition file and by archiving the condensed projection matrices These aspects have been de activated for the present version of ADAS310 although the expansion definition fil
19. ted the expansion file and the charge exchange file The procedure is the same in both cases 3 Data root a shows the full pathwav to the appropriate data sub directories Click the Central Data button to insert the default central ADAS pathway to ADAS User manual Chap4 10 17 March 2003 ADAS User manual the correct data tvpe Note that each tvpe of data is stored according to its ADAS data format adf number Click the User Data button to insert the pathwav to vour own data Note that vour data must be held in a similar file structure to central ADAS but with vour identifier replacing the first adas to use this facilitv The Data root can be edited directly Click the Edit Path Name button first to permit editing Available sub directories are shown in the large file display window b Scroll bars appear if the number of entries exceed the file display window size Click on a name to select it The selected name appears in the smaller selection window c above the file display window Then its sub directories in turn are displayed in the file display window Ultimately the individual data files are presented for selection Data files all have the termination dat The expansion file is selected at b A special ADAS data type adf18 is used for such expansion and cross referencing files They fall into various categories kept in sub directories according to where they map from and to Thus the sub directory a09_a04 contain
20. utines for evaluation of the bound bound Gaunt factors Ban U V B pn l nn n n In a similar manner the bound free rates are obtained The photo ionisation rate coefficient from the level n is Bate Wzi F adx fuW B adx Z 4 10 6 3 3ma j n nir X E D The stimulated recombination coefficients is na i 8ec JW a G 7 fuW B ar 8 1 kT 33ra n i 4 10 7 T Six eXp T x T dx exp kT f iI LIKT x e 1 and the radiative recombination coefficient is 2 3 2 4 4 a 8 nali 8X c Zo kT 3 32a Jn 4 10 8 2 g exp x dx exp l kT Enx p 1 1kT where I Zz Tgi n T is the Maxwellian free electron temperature The ADAS library contains subroutines for evaluation of the bound free Gaunt factors gre The radiation dilution and radiation temperature are relevant only to hydrogen in astrophysical plasmas Thus the general dilution factor for the beam case is set to zero Itis useful however to be able to artificially depopulate the ground level of hydrogen so as to isolate the contributions to populations of excited levels of hydrogen coming from recombination alone This is achieved by having a separate dilution factor applying to photo ionisation from the ground level which can be switched on and off The only requirement here is that this dilution factor and the associated radiation field temperature be large Pre set values in ADAS310 are suitable for most pu
21. y of coefficients as functions of beam energy and plasma density at the reference conditions of the other parameters and then one dimensional vectors of the coefficients as functions of each minor parameter at the reference condition of all the other parameters ADAS310 accepts as input the definition of these scans establishes an extended list of cases required to achieve these scans and then executes repeated population calculations at each set of plasma conditions in the list ADAS310 can compute the populations for any mixture of light impurities hydrogen to neon in the plasma It is impractical to deal with all possible mixtures of impurities It is our usual practice to execute ADAS310 in turn for each light impurity from hydrogen to neon treated as a pure species The mixed species effective coefficients are constructed from these pure impurity solutions by the theoretical data acquisition routines The main population output is very complete and in principle contains all information on possible emitted spectrum lines up to very high n shells together with both ionisation and recombination collisional radiative coefficients It is archived as ADAS data format adf26 ADAS310 can also produce directly the final tabulations of beam stopping coefficient according to ADAS data format adf21 however this is normally done using the post processor program ADAS312 Program steps These are summarised in the figure below
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