Outline Purpose Introduction of FFAG at KURRI Experiment Result Summary Future
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1 Measurement of betatron tunes in KURRI FFAG Main ring Y.Takahoko (FUKUI university) M.Takashima (KYOTO university) Y.Kuriyama (KYOTO university) 1
2 Outline Purpose Introduction of FFAG at KURRI Experiment Result Summary Future
3 Purpose Beam loss exists at main ring Longitudinal instability Transverse instability voltage [mv] Beam loss at main ring Main ring Measurement of betatron tunes Beam loss at Main ring acceleration time [msec]
4 5.KUCA KURRI-FFAG accelerator 3.Booster 11.6MeV 4.Main ring 100MeV 1.Ionization source 10keV.Ion beta 1.54MeV 4
5 Experimental set up Main ring Horizontal Beam monitor Horizontal perturbator Amplifi er Being induced betatron horizontal oscillation. The perturbation component is mixed into the RF pattern for cavity. Triangular board beam monitor Signal Vertical Vertical perturbator Being induced betatron oscillation vertical. Voltage is applied to the electrodes. Bunch monitor beam position detection Beam position detection Beam Beam Triangular board beam monitor Spectrum analyzer (FFT) Bunch monitor 5
6 Structure of the beam position monitor The electrostatic picking up monitors are set up in the vacuum chamber. Triangular board beam monitor Bunch monitor For horizontal For vertical Beam Beam Deviation of horizontal beam position = Difference of induced voltage Induced voltage Induced voltage Beam Beam Deviation of vertical beam position = Difference of induced voltage 6 We can know the beam position according to the induced voltage
7 Measurement of betatron oscillation The betatron oscillation around the close orbit is observed as an amplitude modulation of the output signals. V = A 1 A cos f rev t A= Aside cos f side t A side A side V = A cos f rev t cos { f rev f side t } cos { f rev f side t } Fourier transform Revolution frequency (frev) and sideband (fside) is observed. f side m f rev c= f rev Amplitude [db] Fraction c of betatron tune is obtained from two peaks. fside frev fside 7 Frequency [MHz]
8 Result of a measurement amplitude [db] Output of spectrum analyzer frev fside fside frequency [MHz] 8
9 Tune v.s. Energy Fraction horizontal vertical 9
10 Tune diagram 4 y =6 y =3 3 x=11 Second resonance Third resonance 11MeV 37MeV Fourth resonance Measurement value x y =1 x y =5 x y =10 10
11 Summary Tune was able to be measured at main ring The measuring method of betatron tunes was able to be confi rmed 11
12 Future Further measurement of vertical and horizontal tunes Optimization of betatron tunes Modifi cation of magnetic pole tip Change the F/D ratio Suppress the beam loss through the accelerating process 1
13 付録 13
14 ベータトロン振動の誘起方法 真空ダクトの構造上ベータトロン振動の誘起方法は水平方向と垂直方向で異なる 水平方向 加速空洞使用 水平方向 垂直方向 真空ダクト 平板電極使用 垂直方向 F + E 高周波電圧 中心軌道の粒子の運動量が変化 高周波電場を発生させる 軌道半径が変化する ビームに垂直方向の外力を与える 結果ベータトロン振動を誘起できる 14
15 設計値との比較 加速時間 エネルギー 周回周波数の表 accelerate time (s) E (MeV) F (Hz) Energy VS Horizontal Energy VS Vertical Vertical tune Horizontal Design Measure E (MeV) Design Measure Measured by J.B E (MeV) Design値 TOSCAで ト ラ ッ キ ン グ シ ュ ミ レ ー シ ョ ン し た も の Measured by J.B 過去に測定した結果 (
16 加速器駆動型未臨界原子炉 (ADSR) 009年3月4日 世界初の 加速器駆動型未臨界原子炉実験開始 16
17 Behavior of electron in accelerator y ρ0 Motion equation in focusing magnetic field d x 1 k s x=0 ds d y k s y=0 ds s x Horizontal ρ0 Curvature radius Vertical k Inclination of magnetic field k s s B y B0 0 Betatron vibration x s = s cos s The vibration frequency of the small oscillation near a round is called = c = ds c Ring surroundings length ν Betatoron tune 17 ν An odd value is taken usually
18 Resonance and tune diagram Periodic power is received by the magnetic field error etc It is impossible to adjust the magnetic field error to zero Resonance condition m x n y l m,n,l Integer that is positive or negative νx Tune diagram νxとνyを座標軸とする図の上に 共鳴の線 resonance line を書いたもの 共鳴の線を避ける 運転上好ましいチューンを選ぶ νy 18
19 Integration time Span [MHz] Integration time [ s]
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