BEAM COMMISSIONINGSOFTWARE AND DATABASE

FOR J-PARC LINACHiroyuki Sako

G. Shen, H. Sakaki, H. Takahashi, H. Yoshikawa, JAEAH. Ikeda, VIC

C. K. Allen, ORNL

Outline Overview of commissioning software system Database High-Level Application frameworks Beam commissioning applications Conclusions

J-PARC Accelerator Complex

LINAC commissioning since Sep 2006

RCS commissioning started in Oct 2007

50 GeV Main Ring （ circumference

1600m)

LINACLINAC(330m)(330m)

3GeV Rapid Cycle Synchrotron (RCS)

(circumference 350m)

Nuclei/Particle Physics Experimental Facility

Material and Life Science Facility

Neutrino Experimental Facility

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 closely connected

• Easy development and maintenance of applications– Java

Commissioning Software System

• Device Control– EPICS CA

• JCA/CAJ• Database

– Commissioning DB– Save & Restore DB

• Unit Conversion Server– Physics records

• High Level Applications– JCE/XAL

• Generation of input files for HLA

• Data analysis in commissioning and feedback for device parameters

Interfaces

devices

IOC

Controlsystem

Save and Restore DB

Snapshot ofdevice parameters

Commissioning DB

Model params.

Unit conversion parametersEPICS

channel names

geometry

Unit conversionserver

High Level Applications

Onlinemodel

Data analysis and feedback

input files

Commissioning DB manager

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)

Commissioning DB Manager• GUI for Commissioning

DB– Geometry– Device parameters (e.g. magnetic field)

• Generation of XAL input files

• Save a data set with a tag and comments– Different beam settings– Corrected device

parameters in the commissioning

OPI High Level Applications

Unit ConversionPCAS

Interfaces

Acceleratordevices

IOC

Configuration file generated from CODB

Device records(current)

Physics records (magnetic field)

Monitor and set physical values

convfunc.

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 : 3rd order polynomial (inverse function solved analytically)

High level application frameworks• JCE (Java Commissioning Environment)

– Framework based on a SAD script language– Parser and core codes in Java– Quick development of applications

• Beam diagnostics displays• Magnetic field set panel• Transverse matching

• XAL– Framework in Java developed at SNS– Developed for J-PARC

• Beam envelope simulator• RF tuning• Orbit correction• Beam based alignment• Energy analyzer• Save and Restore DB

• JCE/XAL common functionalities– XAL input files– XAL online model– 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

Applications for J-PARC LINAC Commissioning

RF tuning application (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-fitamplitude with model

Scan RF amplitude and phase

Designed energy

Measured

Energy

• Tune steering magnet so that the orbit passes through the center of a quadruple magnet

Orbit unchanged

Orbit changes withQM field

Beam Position Monitor

Quadrupole magnet

Steering dipolemagnet

Beam Based Alignment

Beam Based Alignment application (XAL)– Change QM and steering field and

measure beam positions with BPM– Find center of QM MEBT1 BPM05

BPM positions vs QM fieldat each steering field

Central BPM positions vs steering slope (from left plot)

QM fieldQM field

Slope (Q vs BPM)Slope (Q vs BPM)

BPM positionBPM position Central BPM positionCentral BPM position

Transverse matching

Wire scannersProfile measurements

Quadrupole magnets (tune beam envelope)

Iterative tuning

Transverse matching application (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 tuningWS measurement

After correction

Energy analysis application (XAL)

• Integrate all information for energy calculations

• Choose a proper FCT pair and calculate energy

Energy evolution duringRF tuning

RF status

FCT statusEnergy

Beam current

RF timingon/off RF tuning stat

JCE applications• Magnet field setter

• Current monitor display

• Beam Loss monitor display

• Beam position monitor display

Design Energy

Measured Energy181MeV

First acceleration to 181 MeV24 Jan 2007

First Injection to RCS (H0 dump) 5 Oct 2007

1%

B

±磁場

±磁

I-BPM

MWPM2QL3BT

ISEP1

QFL SB1 SB2 SB3 SB4QDX PB1 PB2 QDL

MWPM3MWPM4

MWPM5

DSEP1

PB3 PB4 QFM

DSEP2

MWPM6

Dump Q

MWPM7

H0 dump (4kW)

Big-BPM1 Big-BPM2

ISEP2

K-BPM

BLM×4

Dump STR(V & H)

CMCarbon plate(thermometer)

Beam profiles measured by MWPMs

Beam from LINAC

RCS

Conclusions and Outlook

• Commissioning software system developed and successfully applied to J-PARC LINAC– Commissioning DB– Unit conversion server– JCE and XAL

• Improvements for more efficient operation– Maintenance scheme of Commissioning DB– Development of Save and Restore DB

Thank you for your attention!

Save and Restore DB• SCORE application in XAL is used with DB in

PostgreSQL– ~9k channels for RF, magnets, monitors

Time stamp Comment

History ofdataset

1. H0 dump mode4kW

　

　CE1

DCEKICSEP PB

DM 3NP

MRP

3N dump3N target

Linac

to MR

to MLF

4kW 4kW

1MWH0 dumpRCS

In this mode,the 1st 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 : -

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 10th

% level)

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

Orbit Correction (orbitcorrect)

Measured BPM positions (horizontal)

Prediction by online simulator

• After correction, Measured positions agrees well with prediction

After correction

Before correction (SDTL)

Energy calculation from FCT (JCE)

Online energy calculations Energy plot