kazuro furukawa kek jp Super KEKB Injection Beam

< kazuro. furukawa @ kek. jp > Super. KEKB の入射ビーム選択システムの検討 (Injection Beam Scheduling at Super. KEKB Complex through Damping Ring) 古川和朗、船越義裕、菊池光男、菊谷英司、生出勝宣、 佐藤政則、中村達郎、末竹聖明、諏訪田剛、矢野喜治 高エネルギー加速器研究機構 (KEK) Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 1

KEK 電子加速器 (現状) v 600 m Linac v. KEKB 非対称エネルギーコライダ ( Super. KEKB) HER 8 -Ge. V e– 1 n. C x 2 LER 3. 5 -Ge. V e+ 1 n. C x 2 (with 10 n. C primary e–) v. PF 放射光施設 2. 5 -Ge. V e– 0. 1 n. C v. PF-AR 放射光施設 3 -Ge. V e– 0. 2 n. C v様々な運転形態の改善 Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 2

KEKB Operation Improvement Belle/KEK May. 2000 Apr. 2003 Dual Bunch e+ Feb. 2005 Continuous Injections Dec. 2008 Crab Cavities and Simultaneous Injection Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 3

KEKB でのビーム選択 u. KEKB HER、LER 及び PF への同時入射 v 各リングの要求入射頻度を調停し 50 Hz ビームを振り 分ける Remote controlled automatic pattern arbitrator v. Recent typical operation. ³~37 Hz for KEKB LER (3. 5 Ge. V e+) ³~12. 5 Hz for KEKB HER (8 Ge. V e–) ³~0. 5 Hz for PF (2. 5 Ge. V e–) Super. KEKB Beam Scheduling Manual pattern generator . ³~25 Hz ³~12. 5 Hz ³~0. 5 Hz Kazuro Furukawa, KEK, Aug. 2010. 5

タイミング同期関係 Event System for KEKB u. Synchronization Req. Clock Fiducial 114. 24 MHz x 5 HER/LER Injection Phase Control Rubidium SG 571. 2 MHz 2856 MHz X 49 ÷ 275 508. 89 MHz KEKB HER/LER Circumference Correction 508. 89 MHz ÷ 5120 HER/LER Bucket Selection 99. 39 k. Hz KEKB Revolution for PF Linac SHB 114. 24 MHz PF Circumference Correction Flip-flop PF Revolution 1. 6 MHz Flip-flop 50 Hz AC Line Sync. SHB 2 Phase Control x 5 SG 10 MHz SHB 1 Phase Control Event System Acc. Phase, Timing Control v. KEKB : < 30 ps v. PF : < 300~700 ps u. Linac rf is Synchronized to KEKB rf u. Event Clock is 114. 24 MHz u. We have to manage v. Circumference compensation v. Bucket selection v. Injection phase controls Bucket Selection Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 7

イベントタイミング制御システムの構成 u u MRF’s series-230 Event Generator / Receivers VME 64 x and Vx. Works v 5. 5. 1 u 114. 24 MHz event rate, EPICS R 3. 14. 9 with Dev. Sup v 2. 4. 1 50 Hz fiducials 17 event receivers up to now u. More than hundred Event Generator Central 50 Hz-Analog/Timing data u. Multi/single-mode fiber u. Timing precision is < 10 ps. SH_A 1 Injection KL_B 5/B 6 SB_B SB_A e− Gun ARC v < 1 ps with external module. e– BT (PF: 2. 5 Ge. V, 0. 1 n. C) Cont-ABC KL_51/52 SB_C SB_1 SB_2 SB_3 SB_4 SB_5 e+ BT (KEKB: 3. 5 Ge. V, 2 n. C) e+ Target Cont-1 Cont-2 Cont-3 Cont-4 Event Receivers Super. KEKB Beam Scheduling Cont-5 e– BT (KEKB: 8 Ge. V, 2 n. C, PFAR: 3. 0 Ge. V, 0. 1 n. C) Kazuro Furukawa, KEK, Aug. 2010. 8

Linac Event System u. Specifications v. Event rate : 114. 24 MHz ³Bit rate : ~2. 3 GHz v. Fiducial rate : 50 Hz v. Timing jitter (Short term) : ~8 ps v. No. of defined events : ~50 v. No. of receiver stations : 17 v. No. of Fast parameters : ~130 CPU EVG EVR Opt. Fan-out EVR & LLRF Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 9

ビームイベントの取り扱い Human Operator Injection Programs Arbitrate and Generate Beam Mode Pattern (in Python. Tk) considering priorities of the rings equalizing pulsed power supply interval in 4 arrays (waveforms) of length 2 (40 ms) to 500 (10 s) each element corresponds to a 20 -ms time slot and a beam mode Generate Events for the Next 20 -ms Time Slot (in Event Generator) reading two consecutive elements from the beam mode pattern generate several events for the next pulse generate preparation events for the next after next Generate Signals based on Received Events (in Event Receiver) generate pulsed signals as prepared in the previous time slot program the signals (enable/disable, delays, etc) for the next start to generate analog signals for the next Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 10

3 つの仮想加速器の切り換え u Controls and instrumentations are essentially mode-dependent, and mutually independent u Selecting a real machine out of three virtual machines v Managing three parameter sets e− Gun ARC e– BT (PF: 2. 5 Ge. V, 0. 1 n. C) PF Injection e+ Target 20 ms e− Gun Event-based Control System KEKB-LER Injection ARC 20 ms Primary e– e+ BT (KEKB: 3. 5 Ge. V, 0. 6 n. C) (4 Ge. V, 10 n. C) e+ Target e− Gun ARC KEKB-HER Injection e+ Target e– BT (KEKB: 8 Ge. V, 1. 2 n. C) Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 11

Super. KEKB のダンピングリング (DR) u 2 バンチパルス、2 パルスを収容 e− Gun KEKB ARC e+ BT (KEKB: 3. 5 Ge. V, 0. 6 n. C) Primary e– (4 Ge. V, 10 n. C) e+ 25 Hz e– 25 Hz の場合 前半 D. R. e+ 1 e– 2 e+ 3, 1 e+ Target 後半 e– 4 e+ 3 e– 4 e+ 5, 3 e+ 3 e– 6 e+ 5 e– 6 e+ DR (1. 1 Ge. V, 4 n. C) e− Gun ARC Primary e– (3. 5 Ge. V, 10 n. C) Super. KEKB e+ BT (KEKB: 4 Ge. V, 4 n. C) e+ Target Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 13

ダンピングリング (DR) – Linac - Super. KEKB メインリング (MR) u. Linac 後半の位相を固定する場合の入射選択可能 MR バケット数 vハーモニック数 h. DR=224、キッカー立ち上がり 96 ns として 2 ms 以内で探す場合 ³ 49*2 ~ h. DR-49 で 1760 個 (1 バンチ入射) ³ 49*2 ~ h. DR-49*2 で 662 個 (2 バンチ入射) vh. DR=225, 2 ms 以内 ³ 49*2 ~ h. DR-49 で 2123 個 ³ 49*2 ~ h. DR-49*2 で 1008 個 vh. DR=223, 2 ms 以内 ³ 49*2 ~ h. DR-49 で 2096 個 ³ 49*2 ~ h. DR-49*2 で 971 個 vh. DR=230, 2 ms 以内 ³ 49*2 ~ h. DR-49 で 5120 個 ³ 49*2 ~ h. DR-49*2 で 3065 個 >100 ns 96 ns 前のパルス >100 ns 次のパルス 96 ns vh. DR=245, 2 ms 以内 ³ 49*2 ~ h. DR-49 で 2048 個 ³ 49*2 ~ h. DR-49*2 で 1024 個 vh. DR=252, 2 ms 以内 ³ 49*2 ~ h. DR-49 で 4986 個 ³ 49*2 ~ h. DR-49*2 で 3447 個 Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 16

Thank you Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 21

Simultaneous Top-up Injection Results u. Beam currents are kept within v. KEKB 1 m. A (~0. 05%) v. PF 0. 05 m. A (~0. 01%) Super. KEKB Beam Scheduling Kazuro Furukawa, KEK, Aug. 2010. 22

Three-fold Independent Closed Loops u Feedback loop software act on one of three virtual machines v Managing independent parameter sets e− Gun ARC e– BT (PF: 2. 5 Ge. V, 0. 1 n. C) PF Injection e+ Target e− Gun Event-based Control System KEKB-LER Injection ARC Primary e– (4 Ge. V, 10 n. C) e+ BT (KEKB: 3. 5 Ge. V, 0. 6 n. C) e+ Target e− Gun ARC KEKB-HER Injection e+ Target e– BT (KEKB: 8 Ge. V, 1. 2 n. C) Super. KEKB Beam Scheduling 23 Kazuro Furukawa, KEK, Aug. 2010.