FFAG-Workshop Dec. 2005 Kumatori Japan Diagnostics for FFAG- accelerator Takahisa ITAHASHI Department of Physics, Osaka Univ. Toyonaka, Osaka, 560-0043,Japan

FFAG-Workshop Dec. 2005 Kumatori JaFFAG-Workshop Dec. 2005 Kumatori Japanpan

Diagnostics for FFAG-Diagnostics for FFAG-acceleratoraccelerator

Takahisa ITAHASHITakahisa ITAHASHIDepartment of Physics, Osaka UniDepartment of Physics, Osaka Univ. Toyonaka, Osaka, 560-0043,Jav. Toyonaka, Osaka, 560-0043,Ja

panpan


Contents

Performances of beam quality for various Performances of beam quality for various AcceleratorsAccelerators

Diagnostic instruments for a qualified beam Diagnostic instruments for a qualified beam

Diagnostic instruments proposed for PRISM-Diagnostic instruments proposed for PRISM-FFAGFFAG

Conclusion Conclusion


Performances of Performances of up-dated acceleratorsup-dated accelerators 　　 (th(the state of the art)e state of the art) such as static acc., cyclotr such as static acc., cyclotr

on, linac and synchrotronon, linac and synchrotron

1010-4-4 energy resolution (Osaka RCNP ring) energy resolution (Osaka RCNP ring) High beam power around 1 M-watt (PSI)High beam power around 1 M-watt (PSI)Precise positioning less than 1-micron (static acc.)Precise positioning less than 1-micron (static acc.)High Luminosity achieved for B-Physics (KEK, SLAC)High Luminosity achieved for B-Physics (KEK, SLAC)Synchrotron orbit radiation ( SPRING-8)Synchrotron orbit radiation ( SPRING-8)








Tail or skirt part of beam profile or Tail or skirt part of beam profile or beam distributionbeam distribution

The measurement is crucial for high current acThe measurement is crucial for high current accelerators such as PSI cyclotroncelerators such as PSI cyclotron

Achieved extraction efficiency is about 99.9Achieved extraction efficiency is about 99.99% at 1mA operation 9% at 1mA operation

In design of ADS a few hundreds MeV ~ 1 GeIn design of ADS a few hundreds MeV ~ 1 GeV, 100 microA~1mA V, 100 microA~1mA

Precise knowledge of beam distribution is needePrecise knowledge of beam distribution is neededd


6-Dimensional beam behavior 6-Dimensional beam behavior should be should be

discussed in FFAG designdiscussed in FFAG design

Recent study of high current beam dynamics Recent study of high current beam dynamics concerns with non-linear physics issues, which concerns with non-linear physics issues, which includes includes

Space-charge dominated beamsSpace-charge dominated beams

Several resonance effects in FFAG acceleratorsSeveral resonance effects in FFAG accelerators


Beam loss due to deterioration beam Beam loss due to deterioration beam qualityquality

Beam envelope in 6-D phase space, in particulBeam envelope in 6-D phase space, in particularar

Transverse-planesTransverse-planes

Characteristic X-rays which are measuredCharacteristic X-rays which are measured

in a wide dynanic range of intensity lower to in a wide dynanic range of intensity lower to

1010-6-6 of the peak are very helpful for getting the id of the peak are very helpful for getting the ideaseas










Beam loss due to deterioration Beam loss due to deterioration beam qualitybeam quality

Longitudinal-plane???microscopic time buLongitudinal-plane???microscopic time bunch of FFAG beam nch of FFAG beam

Rf-gammaRf-gamma

Particle-particleParticle-particle

For measurement of longitudinal distributioFor measurement of longitudinal distributionn

Comparison for measurement with FFTComparison for measurement with FFT







Diagnostic devicesDiagnostic devicesBeam transformer x(non destructive) Beam transformer x(non destructive) Wall current monitor x(non destructive) Wall current monitor x(non destructive) Pick-ups x(non destructive) Pick-ups x(non destructive) Faraday cup D(destructive)Faraday cup D(destructive)Secondary emission monitor Secondary emission monitor - +- +Wire scanner -Wire scanner -Wire chamber - +Wire chamber - +Ionization chamber - +Ionization chamber - +Beam loss monitor x(non destructive) Beam loss monitor x(non destructive) Gas curtain/jet - Gas curtain/jet - Residual gas monitors x(non destructive) Residual gas monitors x(non destructive) Scintillator screens - + DScintillator screens - + DScrapers, target DScrapers, target DSchottoky scan x(non destructive) Schottoky scan x(non destructive) Synchrotron radiation x(non destructive) Synchrotron radiation x(non destructive) Laser-Compton scattering x(non destructive) Laser-Compton scattering x(non destructive) Q-measurement x(non destructive) -Q-measurement x(non destructive) -Emittance measurement - + DEmittance measurement - + DMeasurement of energy x(non destructive) - + DMeasurement of energy x(non destructive) - + D

Polarimeter x(non destructive) Polarimeter x(non destructive) Based on H. Koziol ( CAS at Univ. of Jyvaskyla)Based on H. Koziol ( CAS at Univ. of Jyvaskyla)



Requirements forRequirements for diagnostics in diagnostics in PRISM-FFAGPRISM-FFAG

Comparison with anti-proton productionComparison with anti-proton productionSimilar facilities as PRISM was ? at CERN and will be AD-project at J-PASimilar facilities as PRISM was ? at CERN and will be AD-project at J-PA

RC(ref. E.Widman).RC(ref. E.Widman).AD : 200 pi mm mrad and dp/p = 6 %AD : 200 pi mm mrad and dp/p = 6 % : stable: stable : proton beam of capture momentum is : proton beam of capture momentum is very helpful for tuningvery helpful for tuning

: various cooling techniques are helpful for storage: various cooling techniques are helpful for storage Comparison with radio-active ion beam at RIBFComparison with radio-active ion beam at RIBF

MUSES : +/- 10 mrad and dp/p = 2.5 %MUSES : +/- 10 mrad and dp/p = 2.5 % : lifetimes of order of 1 microsec.: lifetimes of order of 1 microsec. : cooling and high luminosity are considered for collision: cooling and high luminosity are considered for collision






Measurement of beam profile at POP-FFAG Measurement of beam profile at POP-FFAG with BPM( non-destructive)with BPM( non-destructive)

Measurement of beam profileMeasurement of beam profile

Measurement of beam oscillationMeasurement of beam oscillation

Measurement of synchrotron freq.Measurement of synchrotron freq.

Measurement of betatron tuneMeasurement of betatron tune


Injected muon beamInjected muon beam

Dispersion matched at injectionDispersion matched at injectionCentral momentum : 68 MeV/cCentral momentum : 68 MeV/cRRequiequi = 6.5 m = 6.5 m

Momentum spread : +/- 20 %Momentum spread : +/- 20 %Beam intensity 10Beam intensity 101111 ~ 10 ~ 101212 / sec / sec Aperture : 30 cm (v) x 100 cm (h)Aperture : 30 cm (v) x 100 cm (h)


Scrapers and measurement targetsScrapers and measurement targetsDifferential type beam probe headDifferential type beam probe head

(for transversal) (for transversal)

Differential current measurement in horizontal anDifferential current measurement in horizontal and vertical planesd vertical planesProbe head has a slightly separated(~5mm) tips Probe head has a slightly separated(~5mm) tips Horizontal stroke is +/- 50 cmHorizontal stroke is +/- 50 cmVertiacal stroke is +/- 15 cm or rotated Vertiacal stroke is +/- 15 cm or rotated Measurable current is about 10pA~100nA with lMeasurable current is about 10pA~100nA with log amplifierog amplifier





Position sensitive solid state counter Position sensitive solid state counter (energy and TOF)(energy and TOF)

50 mm x 50 mm silicon strip solid state co50 mm x 50 mm silicon strip solid state counter for energy measurement unter for energy measurement rf-particle TOF measurementrf-particle TOF measurementTwo dimensional measurement between Two dimensional measurement between

position and energy will be avairableposition and energy will be avairable


Sci-FiberSci-Fiber

Sci-Fiber could be applied for beam diagnoSci-Fiber could be applied for beam diagnostics in PRISM-FFAGstics in PRISM-FFAGDr. M. Yoshida-san would have a short coDr. M. Yoshida-san would have a short comment for this issuemment for this issueMr. Takayanagi-san would like to develop tMr. Takayanagi-san would like to develop the device next yearhe device next year..





Parameters for PRISM-FFAG AcceleratorParameters for PRISM-FFAG AcceleratorN = 10N = 10K = 4.6K = 4.6F/D = 6.2F/D = 6.2rr00 = 6.5 m for 68 MeV/c = 6.5 m for 68 MeV/cHalf gap = 17 cmHalf gap = 17 cmmag. Size 110 cm at F centermag. Size 110 cm at F centerTune h : 2.73 and v : 1.58Tune h : 2.73 and v : 1.58


ConclusionConclusion

Feasible and actual design of beam diagnostic Feasible and actual design of beam diagnostic devices in PRISM-FFAG is neededdevices in PRISM-FFAG is needed

Space problem for devices should be solvedSpace problem for devices should be solved

Data taking and display would be needed for Data taking and display would be needed for easy operation of PRISM-FFAGeasy operation of PRISM-FFAG

Precise measurement in 6-D beam optics Precise measurement in 6-D beam optics would be helpful for study of non-linear beam would be helpful for study of non-linear beam dynamicsdynamics

Documents

FFAG-Workshop Dec. 2005 Kumatori Japan Diagnostics for FFAG- accelerator Takahisa ITAHASHI Department of Physics, Osaka Univ. Toyonaka, Osaka, 560-0043,Japan