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150 MeV FFAG

150 MeV FFAG. T. Adachi, M. Aiba, K. Kikuchi, K. Koba, S. Machida, Y. Mori, R. Muramatsu, A. Muto, C. Ohomori, T. Sakae, I. Sakai, Y. Sato, M. Sugaya, T. Shibata, A. Takagi, R. Ueno, T. Yokoi, Y. Yonemura, M. Yoshii, M. Yoshimoto, Y. Yuasa and Joe Nakano - 150MeV FFAG group -

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150 MeV FFAG

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  1. 150 MeV FFAG T. Adachi, M. Aiba, K. Kikuchi, K. Koba, S. Machida, Y. Mori, R. Muramatsu, A. Muto, C. Ohomori, T. Sakae, I. Sakai, Y. Sato, M. Sugaya, T. Shibata, A. Takagi, R. Ueno, T. Yokoi, Y. Yonemura, M. Yoshii, M. Yoshimoto, Y. Yuasa and Joe Nakano - 150MeV FFAG group - May 16, 2003 Nufact-j@東京都立大

  2. Contents 150MeV FFAG Accelerator • Introduction • Schematic drawing • Parameter • Injection and Extruction • Schedule

  3. Introduction - Characteristics of FFAG Fixed Fieldflexibility, easy operation, large beam current, low power consumption FFAG magnetic Field : B=B0(r0/r)k Satisfying the cardinal condition, “zero–chromaticity” Scaling FFAG High repetition rate Super conducting magnet Alternating Gradient Acceleratorstrong focusing, down sizing Compact size ( cf. Cyclotron) Large Horizontal acceptancewide aperture Large momentum acceptance FFAG has characteristics becoming to the manipulator of secondary beam; PRISM, Muon Accelerator. The design of Nutrino factory, Japanese group proposes, based on scaling FFAG ring.

  4. Introduction – 150MeV FFAG Synchrotron • FFAG was proposed by Ohkawa, Symon and Kolomensky. (~50’s) • An electron FFAG at MURA project. PoP FFAG We have no proton FFAG before the PoP (proof of principle) FFAG. In June 2000, Our PoP FFAG accelerated the proton beam successfully. …confirming the acceleration can be done in 1msec. 150 MeV FFAG project The project to construct a practical machine was started. …establishingthe beam extraction in high reputation rate The main issues in a five-year plan … • Extraction of the beam high repetition rate in 250Hz • Development of the 3dimmensional spot scanning Feasibility Study for scaled-up FFAG Accelerator, ex.) Construction of large FFAG ring, Fabrication of Yoke-Free Magnet and large aperture RF system, Establishment of injection and (FAST) extraction scheme …

  5. 150MeV FFAG – Overview KEK-PS East Counter Hall

  6. 150MeV FFAG 実験室概要図 FFAG実験室概要図

  7. 12MeV Proton 150MeV Proton 150 MeV FFAG 実験室概要図

  8. 150MeV FFAG Parameters 250Hz Revolution Freq. : 1.7Mhz-4.6Mhz Bump Decay time: 6.6μsec Current : 40 nA (limited by shield thickness) RFpeak voltage: 19kV 150MeV FFAG –Parameter Cyclotron Parameters Energy : 12MeV Field : 1.69T Current(full) : 25μA RF Freq. : 50Mhz Dee Voltage pulse width : 160μsec@250Hz Extraction Current : 0.5μA (Current in Cyclotron : 2μA） （　　Deflector loss :1.5μA) Dee Voltage with Gate pulse 80μsec 160μsec 4msec

  9. 150 MeV FFAG – Beam simulation • A beam simulation with final design of the magnet. Tune vs. mean radius Tune diagram

  10. F coil D coil F Sector Shunt D Sector 150 MeV FFAG - Return Yoke Free Magnet • “Return Yoke Free Magnet ” The return yoke of Focusing sector is removed. ΦF: B in F Sector ΦD: B in D Sector ΦS: B in Shunt

  11. Focusing sector Defocusing sector with patch w/o patch 150 MeV FFAG – The design of the magnet pole • The final design of the poles • The design of the edge of the F-sector pole w/o patch with patch Magnetic field in the center of sectors BL BL-F/D ratio vs. radius A comparison of Magnetic field in the focusing sector

  12. Measurement of Magnetic field Alignment error ~0.2mm All area of half cell, where the beam pass through, is covered by moving the measurement bench.

  13. Calibration of FFAG magnet Measured field with various F & D current Coil F: 50 turn D: 5 turn Design (125MeV mode) F: 910A / D: 780A Trimmed F: 883.7A / D: 1042.3 Measured field magnitude (not shape) deviates a little from design value.

  14. “Simple” Comparison to TOSCA(after current trimming) dB/B (measured-TOSCA)/TOSCA Deviation between Measurement and TOSCA is within 0.3% in flat field area.

  15. Discrepancy between any Magnets

  16. Magnetic Field (Bz) 20000 15000 10000 5000 Bz (Gauss) 0 -5000 -10000 -15000 -120 -100 -80 -60 -40 -20 0 20 X (cm) 150 MeV FFAG - Measurements of magnetic field. Measurements of magnetic field with hole probe. Discrepancy (ΔB/B) Y Y=-35~+45cm 5cm step The discrepancy between any two magnets is 0.3% at most. The alignment error of hole probe explained that discrepancy. X

  17. FFAGMagnet　設置 三角測量による設置 精度10秒のトランシットを用いた。 三角一辺の長さ　~2m 10秒=0.000048 ∴0.1mm程度の設置精度 ビームライン中心線 CODが要求する0.5mmの設置精度に対し、約0.2mm程度の精度で設置を完了した。

  18. サイクロトロン&トランスポート • サイクロトロン • 250Hzパルス運転の成功 • 最大取り出し電流0.5μA • （サイクロ内部1.5μA） トランスポート （ステアリング+トリプレット四十極電磁石）*2　のシステム ビームトランスポートの調整中

  19. Magnetic Septum Electric Septum 30mm 60deg 22mm 450mm Beam Injection Study 10MeV(137MeV/c) proton Injection Study with Magnetic and Electric Septum Magnetic field 1T for 10MeV protonρ~450mm E=35kV/cm Deflecting angle ~80mrad Distance between electrode 22mm

  20. ~25nA 25th April 2003First circular beam was measured in 150MeV-FFAG Synchrotron Accelerator. 60nA ファラデーカップ 30nA ~25nA Beam Injection Study With Magnetic and Electric Septum Momentum ~137MeV/c particle 150 MeV FFAG 実験室概要図

  21. 150MeV FFAG– Schedule

  22. Summary • We finish the construction of 150 MeV FFAG Accelerator, and starting the beam study. • We observed the circulating beam of one turn with Faraday Cup with Magnetic and Electric Septum. For the next ….. • We are now studying the injection beam orbit in detail, to confirm the FFAG ring satisfying our design. • After installing a set of bump magnets, beam acceleration will be started.

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