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WEPD23 Proceedings of PCaPAC2012, Kolkata, India DESIGN AND D IMPLEM MENTAT TION OF LABVIE EWTM BA ASED GUII FOR REM MOTE OP PERATIO ON AND C CONTRO OL OF EX XCIMER R LASER FOR PLASM MA WAKE EFIELD A ACCELE ERATION N EXPER RIMENT K.K. Mohandas, M K. K Mahavar, #R.A.V. Ku umar, IPR, Gandhinagaar, India S Joshi, A. Sharma, Niirma Univerrsity, Ahmeedabad, Indiia S. contrrol software. The GUI of tthe laser will be integratedd with h the GUI’s of o other compponents of th he experimentt Abstract The paperr describes the developmen nt of a GUI bbased control softw ware for conttrol/operation,, maintenancee and data loggingg of a Coherrent Compex xPro 102 Exccimer Laser (ArF, 1193 nm) usingg LabViewTM instrument coontrol software. INTRO ODUCTION N mer laser (Figg.1) is The Coherrent COMPexxPro102 Excim an ArF gas bbased UV laser operating at a a wavelenggth of 193 nm. Thiis laser uses Ar, A F2, Ne, an nd He gases ffor its operation. Thhe laser can deliver d a max ximum energyy of ~ 200 mJ at 155 ns pulse widdth and capablle of operatingg at a pulse repetittion rate of 1-20 1 Hz. The laser is norm mally controlled uusing a tetherred control panel p which hhas a cable length restriction off around 3 meeters. In orderr that the laser cann be controlled and monito ored remotely,, it is essential thaat a GUI baseed interface be developed. The block-diagram m of system showing s the gas feed system m, the I/O system annd the energyy meters is sho own in Fig.2. c 2012 by the respective authors Copyright ○ Currently, the operatioon of the lasser is carriedd out manually usiing the wired keypad. The main m motivatiion of the developpment of thhis GUI is for easier user convenience as well as foor future use when w the laserr will be used to ggenerate lithium photo-ionizzed plasma foor the plasma wakeefield accelerrator experimeent system. In the experiment, the laser operation o willl be carriedd out remotely andd the laser sysstem will be integrated i witth the accelerator ssystem operatiions via LabV ViewTM instruument Figgure 1: The Excimer laser system. s Figu ure 2: Schemaatic diagram oof the excimerr laser system m showing the gaas lines, I/O O interfaces and energyy caliibration layoutt. such h as accelerato or operation, pprecision heateer controls forr the plasma p chamb ber, vacuum //gas fill system ms as well ass data acquisition equipment, thus providiing a singlee wind dow control of the whoole experimeental system.. Routtine laser operration (settingg of parameterrs and runningg of laaser), mainten nance operatioons like gas fiill and energyy calib bration, loggin ng of laser pparameters etcc., which aree curreently being carried out maanually will be b automatedd using g the GUI. Th his paper pressents the deveelopment of th he module forr the excimer e laserr, i.e., the reqquired LabVIE EWTM virtuall instrrument modu ules, GUI intterfaces and the requiredd displlay screens fo or laser contrrol, parameterr display, gass fill operation o as well as docuumentation/lo ogging of thee operrational param meters of the laaser system. The T paper alsoo preseents the dev velopment off a completelly automatedd mod dule for calibraation of the innternal energy y meter of thee excim mer laser wiith a calibrat ated external laser energyy meteer (Coherentt FieldMax--II). This procedure p iss neceessary as thee performancce and calibrration of thee interrnal energy meter which is uused by the laaser system too stabiilize its laser output o can var ary over a periiod. This one-switcch, automateed operation provides a linear-fittedd calib bration of the internal energgy meter with that of a pre-meter. Thiss procedure iss calib brated commeercial energy m ----------------------------------------------ISBN 978-3-95450-124-3 # [email protected] Latest Trends in GUI Proceedings of PCaPAC2012, Kolkata, India WEPD23 usually carrieed out after eaach gas fill to make sure thaat the health of the laser system is good. Figurre 3: Flow-chart for Gas-Fill Operation. Field-MAX X-II-P energyy meter with an energy s ensor optimized annd calibrated for f use with 193 nm UV laaser is used for extternal energy measuremen nt. The UV s ensor incorporates a DUV quarttz diffuser forr increased cooating damage resiistance. The energy metter has USB B I/O connectivity and hence could c be seam mlessly integgrated into the laserr GUI. MODULE FOR GAS-FILL G OPERATI O ION Excimer Laser uses a mixture of various gases depending oon the waveleength of operration of the laser. The 193 nm operation of the laser usess he, Ne, Ar aand F gases in varrious proportiions which are decided byy the laser system at the time off gas filling op peration. The ggas Figure 5: Fron nt-Panel for N New fill and Pu urge line. riodically so as a to maintainn fills have to be caarried out peri l at its op perating energgy. The flow w-chart of thee the laser gas-ffilling processs based on w which the GUI G has beenn desig gned is show wn in Fig.3. IIn this GUI, gas flushing,, new--fill, purge-gas line aand data logging aree autom matically carrried out. Front Panel forr Flushing ggas Lines Gaas flushing is an essential st step to clear th he gas lines off all impurities i beefore the acttual gas fill operation iss initiaated. When th his operation iis initiated fro om the “Flushh Linee” GUI, all thee gas lines wiill be flushed using helium m gas and since Fluorine is a ccorrosive gass, that line iss flush hed twice as a precautionaary measure. The T image off the GUI G for Flush Line is shown wn in Fig.4. Front Panel forr New-Fill aand Purge Line L Th his GUI assissts in the gass-fill procedu ure. Once thee “NEW WFILL” operattion is initiatedd, the GUI wiill prompt thee user to open or clo ose appropriatte gas valves (MV1/SV1 ( to 4/SV4) and go o through the process of firrst evacuatingg MV4 the gas g lines and the laser cavityy and then fillling all the Figure 6: Fron nt-Panel for ppost gas fill paarameters. Figurre 4: Front-Pannel for Flushinng gas lines. ISBN 978-3-95450-124-3 Latest Trends in GUI 47 c 2012 by the respective authors Copyright ○ The I/O coontrol of the laaser is establisshed via a stanndard RS-232 interrface coupled to the PC through a RS-2332-toUSB interfaace. LabVIEW WTM tools lik ke web-publiishing Tool, structuure palette, string, VISA palette have been used to desiggn this graphiccal user interfaace. The laser is designed to t be controlled either from m the control paneel or from a remote r PC bu ut not from booth at the same tim me. WEPD23 Proceedings of PCaPAC2012, Kolkata, India MODULE M FOR F LASER R MONITOR AND SE ET PARAM METERS Th his GUI is baasically to dissplay the vario ous operatingg and set parameterrs of the laserr. Parameters such as laserr energy, laser rep petition rate and mode of operationn (Con nstant energy or constant vvoltage) can be set. Also,, theree is an option to activate thhe burst-modee operation off the laser l if desired d so by the usser. Flowchartt for this GUII is sh hown in Fig.7. Front-panel ffor this is show wn in Fig.8. Th here are fourr basic operat ating modes under u “Selectt Mod de” viz, HV-P PGR, HV-NG GR (constant voltage v modee with h and withou ut gas purge)), EGY-PGR,, EGY-NGR,, (con nstant energy mode with an and without gas g purge) forr settin ng the running g mode for thhe excimer lasser. At a time,, only y one of the fo our options caan be activateed and can bee chan nged only afterr laser is in offf mode. Figure 7: Flow chart for monitorr and set laaser parameter. required gasses at approppriate pressurres into the laser system. Cuurrently, thesse gas valves are mannually operated. In future, the whole w operatiion could be fully automated if the manuual valves are replacedd by electrically ccontrolled valvves. Once the gas fill is oveer, the GUI will auttomatically flush the gas liines and purgge the lines with innert gas for safety. The GU UI for the gas fill is shown in Figg.5. Post gaas-fill parameeters of the syystem are shown vvia GUI show wn in Fig. 6. This also loggs the data to the loog file. Front Paneel for Displaay of Laser Maintenannce Parameterrs Other sysstem maintennance parameeters such ass gas pressures, fillter ratio (lifettime of the haalogen filter),, total laser pulses, pulses after refill, tube teemperature etcc can be displayed. MODUL LE FOR LA ASER ENE ERGY CALIBRA ATION Th he internal en nergy meter oof the excimer laser taps a smalll percentage of the laser bbeam to moniitor the beam m energy. This is ussed for stabilizzing the laserr output. Overr time, the calibration of thiis internal energy e meterr deterriorates and needs to be corrected ov ver time. Thee calib bration of thee internal ennergy meter can be donee again nst a pre-calib brated externaal energy meteer. By plottingg the outputs o of both h the internal aand external en nergy meters att vario ous operating vo oltages, one caan determine if the internall energy meter is correct. If the calibration iss found to offf by more m than an acceptable peercentage, then the internall energy meter need ds be physicaally recalibrateed. The flow-y calibration is shown in n Fig.9. Thee chartt for energy “STA ART CALIBE ERATION” pprocess requirees the outputss of bo oth the laser and a the externnal energy metter to be read,, the data d averaged and standard deviation deteermined for c 2012 by the respective authors Copyright ○ By using tthe “STARTR RP” command d, these param meters can be loggeed into an Excel file for laser maintennance purposes. Thhe flow chart for f this GUI iss shown in Figg.6. Figure 8 : Frront-panel of Monitor M and laaser Set param meter. Figure 9: Flow-chart foor Energy Caliibration. ISBN 978-3-95450-124-3 48 Latest Trends in GUI Proceedings of PCaPAC2012, Kolkata, India WEPD23 Rea ad Command d Alll parameters (like operatioon-mode, mod de, repetition-rate,HV, Energy, Pressure, Syystem time an nd date, tubee perature, etc.)) of excimer laser are read by runningg temp this VI. V LOGIC CAL SUB--ROUTINE ES Figure 100: Front-Panell of Energy-C Calibration GU UI. various voltaage levels. Thhe averaged daata is plotted in the graph in-situu. After the prrocess ends, the t data is savved in Excel form, and finally pllotted against laser high vooltage, as shown in F Fig 10. The data d points aree then linearlyy fitted to obtain slopes, which arre then compaared to determ mine if the calibratiion of the innternal energy y meter is w within acceptable liimits. The inteernal statisticaal math moduules of M LabVIEWTM are used forr this. The log gged data in Excel format is shoown in Fig.11.. Th here are five sub-routines under this VII. Password sub VI V is used forr the security purpose. Call VI is used for to t call VI from folder w where it has been b saved. Regrression is used to find relation beetween two param meters by lineear fit. Matthematics Th hese sub-VIs are used forr to estimate mean, min, max, standard dev viation and sloope for data in n the energy bration operatiion. calib Save file All data d logging operations o are carried out by y this VI. Mullti Y-axes Graph G All multi m X-Y graaphical repressentations are carried out by th his VI. Step ps for Gas-ffill Alll user messages m rrelated to step-wise explanation/confirrmation of thee manual partt of the gaso are displayed to the user when this VI is fill operation run. LABVIE EWTM DRIV VERS FOR R EXCIME ER L LASER In this Virrtual Instrumeent driver (VII) file, all the SubVI drivers foor different coommands relaated to the exccimer laser operatiion have beeen developed and incorporrated. The VI-Treee showing thhe various VI’s V generatedd for compiling thhis GUI depictted schematicaally in Fig.13.. Flush Com mmand There are four “Flush” commands are used to flussh gas lines of thee various gasses used for operation o f the excimer laserr (Halogen, Buffer, B Rare, an nd Inert gasess). Write Com mmand The four sub-routines under this VI V are set/coontrol functions rellated to runninng of the laser ie., “Run Laaser”, “Stop Laser””, “Change vallue of HV”, “R Repetition Raate” . MODULE M S FOR EX XCIMER LA ASER here are fo our sub VII modules (like Port Th Initiaalization, Gaas-Fill operat ation, Monito or and set param meter and Energy calibraation) for ex xcimer laser whicch have been designed d undeer this modulee. CONCLUSSIONS GU UI for port initialization,, setting and d monitor alll param meters of excimer laser, gaas fill operatio on and energyy calib bration for excimer e laserr are designed by seriall interrface using RS-232, DB B-9 connecto or. But, alll param meters of exccimer laser aree monitor and d set with onee second or two second delayy. Virtual in nstrument off Exciimer laser and d external enerrgy meter is designed usingg LabV VIEW™ softw ware. R Real-Time Datta acquisitionn will be done in vaarious file like ke .doc,.pdf,.xlls,.txt etc. Alll M laserr operation will w be done oon internet in LabVIEWTM envirronment iff all com mputers are connectedd ISBN 978-3-95450-124-3 Latest Trends in GUI 49 c 2012 by the respective authors Copyright ○ Figure 11: D Data for energyy calibration saved in excel file. WEPD23 Proceedings of PCaPAC2012, Kolkata, India Figure 112: View of thhe plasma acceelerator laboraatory showing g the ArF laser and the plasm ma accelerato or chamber. in LAN.Autoomatic prograamming will be b design for L Laser operations annd it will be change. Laserr operation w will be become fasteer and safe thaan it operate manually. m Laseer ual for Coheerent FieldM MaxII-P Laserr [6] User Manu Eneergy Meter. [7] Béla G. Liipták, “Proceess Software and Digitall Nettworking” In nstrument Enngineer’s Haandbook, 3rdd edittion, CRC preess, (2002). [8] User Manual,, Coherent Ennergy Max Sen nsors. Figuree 13: The V-I tree t for the Ex xcimer laser. operations aare easy to opperate and un nderstand by user. Laser Data w will be transferred for long distance usingg RS232 to RS-4885 converter. c 2012 by the respective authors Copyright ○ ACKNOW WLEDGME ENTS The authhors wish to thhank Mr. Yog gesh Yeole andd Mr. Jinto Thom mas for vaarious help rendered with M LabVIEWTM . REFE ERENCES [1] John P Park, Steve Mackay, and d Edwin W Wright, “Practical D Data Communnications for In nstrumentationn and Control,” Elsevier (2003)). [2] Nationall Instruments LabVIEWTM 2010 –softwaare. [3] Jovithaa Jerome, “Virtual Instrrumentation uusing LabVIEW”, PHI Learninng Private Lim mited (2010). [4] Hexin RS-485 to RS-S232 in nterface convverter Model-485.. [5] Cohereent Interfacinng manual for COMPE EXpro (RoHS). ISBN 978-3-95450-124-3 50 Latest Trends in GUI