1 BEAM COMMISSIONING SOFTWARE AND DATABASE FOR J-PARC LINAC Hiroyuki Sako G. Shen, H. Sakaki, H. Takahashi, H. Yoshikawa, JAEA H. Ikeda, VIC C. K. Allen, ORNL Outline  Overview of commissioning software system  Database  High-Level Application frameworks  Beam commissioning applications  Conclusions and prospects

2 J-PARC Accelerator Complex LINAC commissioning started in Sep 2006 RCS commissioning has stared in Oct GeV Main Ring （ circumference 1600m) LINAC(330m) 3GeV Rapid Cycle Synchrotron (circumference 350m ） Nuclei/Particle Physics Experimental Facility Material and Life Science Facility Neutrino Experimental Facility

3 Design concepts of commissioning software system Large number of device channels at J-PARC LINAC –~20k with beam monitors, magnets and RFs must be fully controlled Various settings of devices –Various beam destinations (4 dump lines, 1 transport line to RCS) –Energy 3~181 MeV (during RF tuning)  Central data source –Use of RDB Online model and device control –Should be tightly connected Easy development and maintenance of applications –Java

4 Commissioning Software System Device Control –Java CA libraries JCA/CAJ Database –Commissioning DB –Save & Restore DB Unit Conversion Server –Physics record vs device record High Level Applications –JCE/XAL Interfaces devices IOC Control system Save and Restore DB Snapshot of device parameters update High Level Applications Online model input files Lattice data manager Analysis and feedback Commissioning DB Model params. Unit conversion parameters EPICS channel names geometry Unit conversion server

5 Commissioning DB (CODB) Central data source for commissioning software and infrastructure –Geometry of beam-line devices –EPICS names –Device and beam modeling parameters –Unit conversion function parameters –Generation of input files for high level applications PostgreSQL –“The world’s most advanced open source DB” –Being improved rapidly (both performance and functionalities)

6 Lattice Data Manager GUI for lattice related tables –Geometry and device parameters (e.g. mag field) Generation of XAL and Trace3D input files Save a data set with a tag and comments –Different beam energy modes –Different beam lines –Tuned parameters in the commissioning

7 Save and Restore DB SCORE application in XAL is used with DB in PostgreSQL –~9k channels for RF, magnets, monitors Time stamp Comment History of dataset

8 OPI High Level Applications Unit Conversion PCAS Interfaces Accelerator devices IOC Configuration file generated from CODB Device records (current) Physics records (magnetic field) Monitor and set physical values conv func. Unit Conversion Server Provides physics records in connection to device records –Indispensable for efficient beam commissioning Portable Channel Access Server ~400 magnet power supplies –Conversion function : 3 rd order polynomial (inverse function solved analytically)

9 High level application frameworks JCE (Java Commissioning Environment) –Framework based on a script language (SAD script) –Parser and core codes implemented in pure Java –Quick development of applications XAL –Framework in Java developed at SNS –Developed for J-PARC JCE/XAL common functionalities –XAL input files –XAL online model –EPICS CA XAL wrapper class for JCA/CAJ Add->{KBFComponentFrame[ Add-> {KBFGroup[Text->"Wire Scanners X for emittance fit"]}, Add-> {KBFCheckButton[Width->xwid,Variable:>awsx[1],Text->ws[1],WidgetVariable:>wawsx[1]]}, Add-> {KBFCheckButton[Width->xwid,Variable:>awsx[2],Text->ws[2],WidgetVariable:>wawsx[2]]}, Add-> {KBFCheckButton[Width->xwid,Variable:>awsx[3],Text->ws[3],WidgetVariable:>wawsx[3]]}, Add-> {KBFCheckButton[Width->xwid,Variable:>awsx[4],Text->ws[4],WidgetVariable:>wawsx[4]]}, …. JCE script JCE application

10 Applications for J-PARC LINAC Commissioning

11 RF tuning (XAL) time of flight Energy Fast Current Transformers H - Beam Tune amplitude and phase of RF to accelerate beam to a designed energy by measuring time of flight of beam. RF phase Energy Select best-fit amplitude with model Scan RF amplitude and phase Designed energy Measured Energy

12 Tune steering magnet so that the orbit passes through the center of a quadruple magnet Orbit unchanged Orbit changes with QM field Beam Position Monitor Quadrupole magnet Steering dipole magnet Beam Based Alignment

13 Beam Based Alignment (XAL) –Change QM and steering field and measure beam positions with BPM –Find center of QM MEBT1 BPM05 BPM positions vs QM field at each steering field Central BPM positions vs steering slope (from left plot) QM field Slope (Q vs BPM) BPM position Central BPM position

14 Transverse Matching Wire scanners Profile measurements Quadrupole magnets (tune beam envelope) Iterative tuning

15 Transverse Matching (JCE) Measurement of beam profiles with wire scanners Optimize QM field for periodic beam envelope with Newton-Raphson method Mismatch factor of less than 5% achieved Before correction QM tuning WS measurement After correction

16 EnergyMaster (XAL) Integrate all information for energy calculations Choose a proper FCT pair and calculate energy Energy evolution during RF tuning RF status FCT status Energy Beam current Acc timing RF on/off

17 Design Energy Measured Energy 181MeV First acceleration to 181 MeV 24 Jan 2007

18 First Injection to RCS (H0 dump) 5 Oct % B ± 磁場 ± 磁 I-BPM MWPM2 QL3BT ISEP1 QFL SB1 SB2 SB3 SB4 QDX PB1 PB2 QDL MWPM3 MWPM4 MWPM5 DSEP1 PB3PB4 QFM DSEP2 MWPM6 Dump Q MWPM7 H0 dump (4kW) Big-BPM1 Big-BPM2 ISEP2 K-BPM BLM×4 Dump STR (V & H) CM Carbon plate (thermometer) Beam profiles measured by MWPMs Beam from LINAC RCS

19 Conclusions and Prospects Commissioning software system developed and successfully applied to J-PARC LINAC –Commissioning DB –Unit conversion server –JCE and XAL For more efficient operation –Efficient maintenance of Commissioning DB –Development of Save and Restore DB

20 Thank you for your attention!

21 1. H0 dump mode 4kW CE1 DCE KIC SEP PB DM3NP MRP 3N dump 3N target Linac to MR to MLF 4kW 1MW H0 dump RCS In this mode, the 1 st foil is removed, so the linac beam is directly driven to the H0 bump. * Tuning of : - Injection orbit - H0 dump line - 1st foil: OUT - 2nd foil: IN - 3rd foil: IN - Ring magnetic field : fixed at 181 MeV - RF : - - Collimator : -

22 Online model Online magnetic field values fetched via CA (via unit conversion server) Envelope and orbit calculations XAL online model compared to Trace3D (a few 10 th % level)

23 ER diagram of Commissioning DB (for lattice info) PostgreSQL 8.1 Beam table –Twiss/emittance/energy Generation of Probe file Lattice data –Geometry table (static) –Device parameter table (many sets of data with tags) –Different tables for each device type Dipole magnet Quad magnet RF monitor

24 Orbit Correction (orbitcorrect) Measured BPM positions (horizontal) Prediction by online simulator After correction, Measured positions agrees well with prediction After correction Before correction (SDTL)

25 JCE scripts Magnet field setter Current monitor display Beam Loss monitor display Beam position monitor display

26 Energy calculation from FCT (JCE) Online energy calculations Energy plot