RIBF 加速器での研究紹介 （加速器高度化チーム/低温技術チーム/大強度標的チーム）
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- ともあき しろみず
- 5 years ago
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1 RIBF の紹介 RIBF 加速器複合系 荷電変換装置の開発 プラズマストリッパーの開発計画 大強度ウランビーム生成用プラズマストリッパーの開発計画理研奥野広樹
2 RI Beam Factory (RIBF) Operation of RIBF (1997~) The world s most intense RI Beams over the whole range of atomic masses Powerful Heavy Ion Accelerator (Projectile Fragmentation) Existing Accelerator Complex 18GHz ECRIS RILAC RRC frc SRC New Cyclotron System IRC 18GHzECR+RILAC+RRC+fRC+IRC+SRC 400MeV/u (Light Ion) 350MeV/u (Very Heavy Ion, Uranium) I = 1pmA (6 x #/s)
3 Specifications of RIBF ring cyclotrons Challenging frc IRC SRC RRC (1986~) K-number (MeV) frc Rinj (cm) Rext (cm) Weight (tons) Sector magnets IRC Number of trim coils (/ main coil) (SC) 22 (NC) 26 Trim coil currents (A) (SC) 1200 (NC) RF resonators 2+FT 2+FT 4+FT SRC Frequency range (MHz) Acceleration voltage (MV)* Turn separation (cm)* *uranium acceleration SC : superconducting, NC : normal conducting, FT : flattop resonator Courtesy of N. Fukunishi
4 SRC: the World s First Superconducting Ring Cyclotron K: the maximum bending power of extracted beam from the cyclotron K = 2,600 MeV Max. Field: 3.8T (235 MJ) Rf frequency: MHz Weight: 8,300 tons Diameter: 19m Height: 8m Total acceleration: 640 MV Sector Magnets :6 Rf Resonator :4 Injection elements: Extraction elements: Side Shield Control Dewar (Open for mainte.) Upper Shield Upper Yoke Side Yoke Superconducting Bending Magnet Lower Yoke Self Magnetic Shield Self Radiation Shield SC Main Coil SC Trim Coil Lower Shield rf-cavity
5 Intensity upgrade at RIBF RILAC2 RRC frc IRC SCECR Accelerators He gas Rotating Be disk SRC 49 pna U (~3x10 11 #/s 2015) Germany/GSI RIBF starts! Transmission of the beam: improved Stability of the devices: improved The new injector (RILAC2) starts! He gas stripper Rotating Be disk frc upgrade (K570=>K700) 大強度多価イオン生成が可能! 28-GHz SC-ECR
6 R&D studies on charge strippers (motivation) RRC C.S. frc C.S. IRC SRC RILAC2 Before After SCECR 11 MeV/u 50 MeV/u or Achieved beam intensity Goal intensity Current at exit of SRC in GHz SC-ECRIS+RILAC2 First beam 1day
7 Gas Foil History of R&D on the 1 st stripper Rotating cylinder with a large foil Carbon NanoTube foil CNT-SDC foils (User run in 2011) Slow rotation Charge states in N 2, Ar, CO 2 Is lower than acceptable charges. He gas stripper 8 m and 0.5 m prototypes Technical challenge: Confinement of He gas 10 cm Gas cell Cross section of e-loss and e-cap in Low-Z gas in operation (2012-)
![[ns] [ns] Fundamental data for the 1 st charge](/docs-images/86/94651340/images/8-1.jpg "stripper Charge evolution s(1e-loss) and s")
8 [ns] [ns] Fundamental data for the 1 st charge stripper Charge evolution s(1e-loss) and s (1e-cap) N 2 53 He s(e-loss) Z Energy spread after charge strippers Jitter of beam timing after the stripper U-MS He gas 2011 U-MT rotating C-foil -0.2 operation -1.4
9 Windowless He accumulation system 7 kpa (0.7 mg/cm2) He gas target 5stage differential pumping system Recirculation by Mechanical booster pump array (oil free)
10 He-gas 11 MeV/u (1st stripper) H. Imao et al, Phys. Rev. ST Accel. Beams 15 (2012) TMP TMP Mechanical booster U 35+ 1pmA U kpa (50 cm) 0.7 mg/cm 2 of He gas (windowless) Large beam aperture: > f 10 mm 8 order pressure reduction: 7,000 Pa => 10-5 Pa 5 stage differential pumping: 21 pumps He circulating volume: 300 m 3 /day (unique recycling system) 昨年の研究会での話のテーマ
11 どちらが大強度を出せるか? 多価チャージイオン源 U MeV/u U 35+ 低チャージイオン源 U X MeV/u 荷電変換 -X MeV/u 0.66 MeV/u 収量 ブライトネス 加速コスト ストリッパーの形態固体はまず無理水素 (He) ガス水素 (He) プラズマ ( ガスよりも価数が高い )
12 プラズマストリッパーは低エネルギーほど有利 Plasma Target Cold gas 1 Collisional ionization by ions 2 Coulomb collision with free electrons 3 bound electron capture 4 radiative electron capture = sigma(3) x 1/100 5 Dielectronic recombination
13 U(1.4 MeV/u)+ 水素で得られる価数 水素ガス 15%( 電離度 85%) s( 軌道電子からの capture)>>s( 自由電子からの capture) 断面積の中性ガスでのデータを取得する予定
14 電離度 (SAHA の式 ) 電離度 85% を得るためには 例 :T=16000K, p0=170 torr
15 必要な厚み (20ug/cm2 と仮にして ) ガス : 水素 T=16000K, P=170 torr, 長さ :50cm Thickness=17ug/cm2 プラズマの密度 :10^17/cc
16 アークプラズマのスタディのきっかけ Difficulty in accumulation of low-z gas The existing gas stripper:he ~15 mg/cm 2 (0.7 kpa ) (cf. N mg/cm 2 ) ~1mg/cm 2 of low-z gas is necessary to be accumulated to get higher charge state. A new device to make it possible Plasma Window (1995-) Inventor:Ady Hershcovitch (BNL)
17 Plasma Window (Wall Stabilization Theory) Plasma by arc (15000K) Atomosphere Vaccuum
18 Schematic sketch of the low-z gas stripper using two plasma windows Plasma Window TMP TMP U 35+ beam He input U??+ beam He output MBP Scroll Pump Gas Cell Scroll Pump MBP 実際は 通常の差動排気を用いた
19 R&D on Plasma Window at RIBF (-March 2011: Kuboki) Results: Ar He, d = 2 mm 6 mm (~2013) gas cell with one plasma window Restart: toward Larger aperture of 1~2cm (Sep. 2015, Ikoma) Spectroscopy of arc plasma (with help from Prof. Namba)
20 コリメータ 実験セットアップ PW 生駒直弥 20
21 He(5 枚, 真空側から ) nm(3 3 D 2 3 P) が非常に強い 小さいスペクトルも見えるようにすると nm が飽和 ( 紫 ) nm が飽和しないようにすると小さいスペクトルが見えない ( 緑 ) 21 生駒直弥
22 スペクトルのアサイン ( その 1) 小さいスペクトルも見えるよう, 飽和した方を載せています nm (4 3 D 2 3 P) nm (5 3 D 2 3 P) nm (3 3 P 2 3 S) nm (3 3 D 2 3 P) nm (4 1 D 2 1 P) nm (3 1 P 2 1 S) nm (3 1 D 2 1 P) I nm (6 2 D 4 2 F) nm (3 3 S 2 3 P) nm (3 1 S 2 1 P) nm (7 3 P 3 3 S) nm (10 1 P 3 1 S) 生駒直弥 22
23 スペクトルのアサイン ( その 2) 短波長側, 拡大 nm (5 3 P 2 3 S) nm (4 3 P 2 3 S) nm (4 1 P 2 1 S) nm (6 3 D 2 3 P) nm (7 3 D 2 3 P) nm (5 1 D 2 1 P) nm (5 3 S 2 3 P) nm (6 1 D 2 1 P) nm (4 3 S 2 3 P) 生駒直弥 23
24 Voltage [V] Pressure Reduction Factor PW 性能の長さ ( 中間電極枚数 ) 依存性 電流は 36A/Cathode, 流量は 17.1slm 固定 Voltage Pressure Reduction Factor The Number of Cooling Plate 中間電極枚数に比例し, 電圧, 圧力比が増加 生駒直弥
25 まとめ RIBF 加速器は 2007 年から 順調にウランイオンビームのビーム強度を増やしている 多価イオン源のビームを増加させると エミッタンスも増加し ブライトネスが増えず 結果的に最後の加速器まで通らず ネットに考えてビームが増えない可能性が出てきた 低チャージから始めて ある程度加速してから価数が高く取れるプラズマストリッパーでは電子を剥ぎ取る方法を検討を開始 計算 : プラズマ温度 =16000K P=170 torr, 50cm 程度のものが必要 Thickness=17ug/cm2 プラズマの密度 :10^17/cc 予定 水素での点火 ( 難しい?) 中性ガスの断面積をしっかり測定 分光等により電子温度や電子密度等を測定 プラズマウィンドウの長さ依存性
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