e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra CM18 Ecloud/TMCI Feedback Progress and future directions J.D. Fox 1 LARP Ecloud Contributors: J. Cesaratto 1 , J. D. Fox 1 , M. Pivi 1 , K. Pollock 1 , C. Rivetta 1 , O. Turgut 1 , S. Uemura 1 G. Arduini 2 , W. Hofle 2 , K. Li 2 ,G. Rumolo 2 , B. Salvant 2 M. Furman 3 , M. Venturini 3 , S. De Santis 3 , Z. Paret 3 , R. Secondo 3 , J.-L. Vay 3 A. Drago 4 , S. Gallo 4 , F. Marcellini 4 , M. Zobov 4 1 Accelerator Research Department, SLAC 2 BE-ABP-ICE Groups, CERN 3 Lawrence Berkeley Laboratory 4 LNF-INFN J. D. Fox LARP CM18 May 2018 1
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra SPS Ecloud/TMCI Instability R&D Effort Motivation - control Ecloud and TMCI effects in SPS and LHC via GHz bandwidth feedback Ongoing project SLAC/LBL/CERN via US LARP Proton Machines, Ecloud driven instability - impacts SPS as high-current LHC injector Photoelectrons from synchrotron radiation - attracted to positive beam Single bunch effect - head-tail ( two stream) instability TMCI - Instability from degenerate transverse mode coupling - may impact high current SPS role as LHC injector Multi-lab effort - coordination on Non-linear Simulation codes (LBL - CERN - SLAC) Dynamics models/feedback models (SLAC - LBL-CERN-Stanford STAR lab) Machine measurements- SPS MD (CERN - SLAC - LBL) Kicker models and simulations ( LNF-INFN,LBL, SLAC) Hardware technology development (SLAC,) J. D. Fox LARP CM18 May 2018 2
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Organization and People - Some welcome new faces SLAC J. Fox (50%), K. Li, C. Rivetta(50%), J. Olsen, J. Dusatko(30%), M. Pivi(20%) J. Cesaratto ( Toohig Fellow) Ozhan Turgut, K. Pollock ( Stanford Graduate Students ) CERN - W. Hoefle, B. Salvant, U. Wehrle SPS/LHC Transverse Feedback MD planning and MD measurements TMCI simulations and measurements LBL J-L Vay, M. Furman, Z. Paret R. Secondo, S. De Santis Kicker study, Ecloud Simulation effort (WARP), Pickup Equalizer LNF-INFN F . Marcellini, S. Gallo, M. Zobov, A. Drago Kicker study, Impedance estimates J. D. Fox LARP CM18 May 2018 3
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Recent efforts and Recent progress ' 005.pdf Delay, Excitation Length Sequence Injection Memory Synch Power Amps Trigger D/A Kicker Offline Transfer Master Function ~ RF Beam Excitation Pickups ∆ Y Data Receiver Σ Recorder RF J. D. Fox LARP CM18 May 2018 4
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Kicker Options Design Study LNF-INFN,LBL and SLAC Collaboration. Excellent progress 2012 Goals - evaluate 3 possible options Stripline (Arrays? Tapered? Staggered in Frequency?) Overdamped Cavity ( transverse mode) Slot and meander line ( similar to stochastic coooling kickers) Based on requirements from feedback simulations, shunt impedance, overall complexity - select path for fab ' v out Beam 5-2000 v out 8545A13 J. D. Fox LARP CM18 May 2018 5
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Kicker Options - Ideas from S. De Santis and Z. Paret Study of multiple striplines for bandwidth and overall shunt impedance RF models and estimates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ox LARP CM18 May 2018 6
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Kicker Options - Idea from S. Gallo Use 25 ns interval between bunches, have kicker with 20 ns fill time High shunt impedance, requires more complex off-diagonal processing, input and output data at different rates ! ! "#$%&'!() ! "#$%&'!(* ! "#$%&'!(+ ! ,-.& ! !"#$%&$'( ) *+,$"-.)/0112)3(45)673( ) *+,$"-.)/0112)3(45)673( ) +/01!23405#067 ! 8*)9):22)0;< ) =22)>)1?)0;< ) 1@22)>)1?)0;< ) 8&4967 ! 1A)B6 ) 1C)B6 ) 12)B6 ) :#;;#49!<=& ! 25?)'D ) 12)'D ) 12)'D ) > 8 ! EEE ) @C ) F= ) ?7@46!A=.&034$& ! G)15C)HI)JK)8*L ) G)15C)HI)JK)=22)0;<L ) G)@5@)HI)JK)1@22)0;<L ) Assuming that each kicker is powered by a 1 kW source covering the entire device bandwidth, the resulting transverse voltage transferred to the beam as a function of the frequency is shown in the following plot. J. D. Fox LARP CM18 May 2018 7
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Kicker Options - Idea from J. Cesaratto similar to stochastic cooling kickers wideband - ( longitudinal Impedance estimate in progress by M. Zobov) 60000 Shunt Impedance ( � ) 50000 40000 30000 20000 10000 0.0 0.5 1.0 1.5 2.0 Frequency (GHz) J. D. Fox LARP CM18 May 2018 8
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra System Development for MD studies 4 GS/sec bunch-synchronized random excitation system with GUI Broadband 80W 20 - 1000 MHz amplifiers Not ideal, useful for MD studies Chassis , couplers, remote control for tunnel hardware Hardware equalizer for real-time front end SPS Proton Distribution 2 1 0 0 500 1000 1500 Proton Index Applied Signal (Turns 101:200) 1 0.5 0 Applied signal (Turn 1 after warm−up) −0.5 1 Amplitude −1 200 0 30 150 20 10 −1 5 10 15 20 25 30 100 Turns Samples Samples J. D. Fox LARP CM18 May 2018 9
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Hardware Equalizer Pickup response distorts beam signals Long cables also have nonlinear phase response Existing software equalizer used in matlab data processing we need a real-time ( hardware) equalizer for processing channel Started by R. Secondo, now K. Pollock J. D. Fox LARP CM18 May 2018 10
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra 4 Gs/sec. 1 stack SPS feedback channel We are building a proof-of-principle channel for closed loop tests in SPS before the 2013 shutdown, using existing kicker and excitation system Flexible reconfigurable processing - evaluate multiple processing algorithms J. D. Fox LARP CM18 May 2018 11
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra Proof of Principle processing � � � � 4%-5 � (3 � ,)(#6 � +)7)'18)+9 : � $100);$(-' � *<=: � ,1-;+ >(5% $"3510 :/? ,1-;+ � >(5% � $"3510 � :/? � @ � /:? � +-"6%5);,1-;+3 A#5);B-$)3 � 51 � $108"5); � 7(- � C&! J. D. Fox LARP CM18 May 2018 12
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra � � Prototype using FPGA evaluation board 0.-+&.&(/"/',( � )&/"'+12 � )&*&+,-'(3 � 4%, � )"536/,"#$12 � )89 �� :,"#$ � ; � 8)9 � :,"#$ � )89 � 7,"#$ � "+1, � <,(/"'(1 � <'#<5'/#= � >,# � 4'.'(3? � )'"3(,1/'<1 � "($ � @A: � '(/&#>"<& � 46'1 >+" ,# ,> BCD8 '1 ,-/'.' &$ >,# � 46'1 � >+"*,# � ,> � BCD8 � '1 � ,-/'.'E&$ � >,# � 6'36 � 1-&&$ � 1&#'"+ � 0FG? � 75/ � 1/'++ � <,(/"'(1 � &(,536 � )AC � #&1,5#<&1 � HIJK � 1+'<&1L � >,# � ,5# � #&M5'#&.&(/1 � !"1 5- /, NJD: ,> ))OP .&.,#= !"1 � 5- � /, � NJD: � ,> � ))OP � .&.,#= � !"1 � /%, � 6'36 � 1-&&$ � 0FG � <,((&</,#1 � >,# � >'//'(3 � $"536/,"#$1 � ,(/, J. D. Fox LARP CM18 May 2018 13
e-Cloud/TMCI What’s New MD results What’s New - Models Summary Recent Publications Extra 4 GS/sec ADC daughtercard � !"# � "$%&'()*+,$*-. � 01)1 � (2, � 3$456 � 3!789: � ;<;=>$/1 � / ? � +5( � !"#1 � 5@ � 5@()*A)$B)- � 6,-) � (, � &)( � C=>$/1 � 1$6DA5@& � E)F)5B)1 � )4()*@$A � 1$6DA) � FA,FG � ")A$ H,* 5@()*A)$ )- 1$6DA)1 51 � ")A$I � H,* � 5@()*A)$B)- � 1$6DA)1 � 51 � &)@)*$()- � )4()*@$AAI � J$1 � H5@) � -)A$I � B)*@5)* F,@(*,A � H,* � 1$6DA) � $D)*(%*) � KL;D1 � 6$4M � !-N%1($+A) *)H)*)@F) A)B)A � !-N%1($+A) � *)H)*)@F) � A)B)A � !-N%1($+A) � 5@D%( � ,HH1)( � F,6D)@1$(5,@ � J. D. Fox LARP CM18 May 2018 14
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