Advanced Timing Solutions for SuperKEKB Injector Upgrade

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Explore the challenges and precision requirements in timing mechanisms for the SuperKEKB Injector Linac upgrade by Kazuro Furukawa from KEK. Discusses the DR timing, MR revolution, duty cycles, and distributed bus functionality with multiplexed counters for signal transmission.

  • Timing Solutions
  • SuperKEKB
  • Injector Upgrade
  • Timing Precision
  • KEK
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  1. Possible Damping Ring Timing Possible Damping Ring Timing Kazuro Furukawa Kazuro Furukawa Injector Linac, KEK Injector Linac, KEK < <kazuro.furukawa@kek.jp kazuro.furukawa@kek.jp> > Some info at <http://www-linac.kek.jp/cont/epics/event/> Conference papers at <http://www-linac.kek.jp/linac/> K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 1

  2. DR timing Bucket selection in Phase Bucket selection in Phase- -2 with DR 2 with DR Without DR, simply wait up to 5120 x 96 ns ~ 490 Without DR, simply wait up to 5120 x 96 ns ~ 490 s s 96 ns : highest common frequency between linac 96 ns : highest common frequency between linac ring ring e Gun KEKB ARC e+BT (3.5GeV, 0.6nC) Primary e (3.5GeV, 10nC) e+Target With DR, in order to select arbitrary bucket in MR, have to wait up With DR, in order to select arbitrary bucket in MR, have to wait up to ~4.5 ms, even if a bucket in DR was carefully selected to ~4.5 ms, even if a bucket in DR was carefully selected Power supply can wait only 2 ms, one of only 2798 buckets in 5120 buckets can be Power supply can wait only 2 ms, one of only 2798 buckets in 5120 buckets can be selected, may have to change LLRF condition at latter half of linac every pulse selected, may have to change LLRF condition at latter half of linac every pulse 96ns e+DR (1.1 GeV, 4nC) >100ns e Gun SuperKEKB >100ns 96ns ARC e+BT (KEKB: 4GeV, 4nC) Primary e (3.5GeV, 10nC) e+Target Can be a big challenge in LLRF precision Can be a big challenge in LLRF precision K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 2

  3. Memo Memo from Oct.6.2016 from Oct.6.2016 32k 32k 14ms 12 2ns 2ns 4ns step Bunch Bunch Kicker 20 20% % Duty Duty TTL Kicker Kicker 2 pulse ??? ??? Start Start Kicker Kicker (NIM)/TTL Revolution Revolution 2 2 MR RF MR RF DR Revolution Kicker / BPM EVR Kicker / BPM EVR Revolution 15 slot VME64x x2 15 slot VME64x x2 Dispersion Dispersion 509 MHz + +/ /- - 50kHz 50kHz Linac Linac 509 MHz/Revolution Main event system Main event system Event Event system system System Dispersion Dispersion Kicker Event System Event System Kicker Kicker Kicker Event system Event system Event system 14ms 12 0.5 4ns step 0.5 Kicker Revolution Revolution Timing Timing TTL 2 pulse pulse pulse (NIM)/TTL DR Revolution DR RF Revolution DR RF DR Revolution DR Revolution 2 2 509 MHz 509 MHz/Revolution System Kicker Kicker Event system Kicker signal Kicker signal K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 3

  4. Distributed bus and multiplexed counters Distributed bus and multiplexed counters The distributed bus allows transmission of eight simultaneous The distributed bus allows transmission of eight simultaneous signals with the event clock rate time resolution (10 ns at 100 MHz signals with the event clock rate time resolution (10 ns at 100 MHz event clock rate). The source for distributed bus signals may come event clock rate). The source for distributed bus signals may come from an external source or the signals may be generated with from an external source or the signals may be generated with programmable multiplexed counters (MXC) inside the event programmable multiplexed counters (MXC) inside the event generator. generator. The The distributed bus signals distributed bus signals may may be programmed to be be programmed to be available available as hardware outputs as hardware outputs on on the event receiver. the event receiver. K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 4

  5. MXC and Sequencer MXC and Sequencer The end sequence code 0x7f resets the The end sequence code 0x7f resets the sequencer RAM table address and timestamp sequencer RAM table address and timestamp register and depending on configuration bits, register and depending on configuration bits, disables the sequencer (single sequence, disables the sequencer (single sequence, SQxSNG SQxSNG=1) or restarts the sequence either =1) or restarts the sequence either immediately (recycle sequence, immediately (recycle sequence, SQxREC waits for a new trigger ( waits for a new trigger (SQxREC SQxREC=1) or =0). =1) or SQxREC=0). K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 5

  6. K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 6

  7. Pulse Pulse- -to to- -pulse modulation pulse modulation Event-based Control System Four PPM virtual accelerators Four PPM virtual accelerators for SuperKEKB project for SuperKEKB project Every Every 20 ms 20 ms F.B F.B e e Gun Gun Based Based on Dual Dual- -tier controls with tier controls with EPICS and event EPICS and event- -system on ARC ARC PF Injection e e (2.5GeV, 0.2nC) (2.5GeV, 0.2nC) system F.B Damping ring Damping ring e e Gun Gun Independent parameter sets Independent parameter sets for each VA ( for each VA (20ms) 20ms) >200 parameters >200 parameters for equipment controls for equipment controls many more many more for beam for beam controls controls F.B ARC ARC SuperKEKB-LER Injection e e (3.5GeV, 10nC) (3.5GeV, 10nC) e e+ +Target Target e e+ +(4GeV, 4nC) (4GeV, 4nC) F.B e e Gun Gun ARC ARC SuperKEKB-HER Injection F.B maybe with maybe with additional of stealth of stealth beam beam for for measurement measurement additional PPM VA PPM VA F.B e e (7GeV, 5nC) (7GeV, 5nC) e e Gun Gun F.B ARC ARC PF-AR Injection e e (6.5GeV, 5nC) (6.5GeV, 5nC) K.Furukawa, KEK, Jun.2016. Injector Linac Upgrade towards SuperKEKB 7

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