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00 0 Changes to the PS RF system 04 April 2014 H. Damerau Many thanks for discussions and input to L. Arnaudon, D. Cotte, S. Hancock, R. Maillet, M. Morvillo,

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Presentation on theme: "00 0 Changes to the PS RF system 04 April 2014 H. Damerau Many thanks for discussions and input to L. Arnaudon, D. Cotte, S. Hancock, R. Maillet, M. Morvillo,"— Presentation transcript:

1 00 0 Changes to the PS RF system 04 April 2014 H. Damerau Many thanks for discussions and input to L. Arnaudon, D. Cotte, S. Hancock, R. Maillet, M. Morvillo, M. Paoluzzi, D. Perrelet, S. Rains, C. Rossi, S. Totos BE/OP Shutdown Courses 2014

2 1 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

3 2 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

4 3 Introduction Beams from single bunch to 72 bunches, flexible longitudinal pattern Intensity range from about 10 9 to 3 · particles per cycle Major bunch shortening along the cycle, from 180 ns to 4 ns (45 times!) After LS1: BCS, BCMS, PBC, etc. What has changed for the RF systems after LS1? What to do with the modified RF systems? Stevens lecture PS Protons from PSB Protons and ions to SPS (and LHC) Protons to AD and nTOF target Pb 54+ (future: Ar 11+, Xe 39+ ) from LEIR Protons to fixed target experiments

5 4 RF Systems to perform manipulations to SPS PS 24 (+1) cavities from 2.8 to 200 MHz Acceleration 2.8 – 10 MHz 200 MHz Longitudinal blow-up and 200 MHz structure for SPS 13/20 MHz 80 MHz 40 MHz RF Manipulations

6 5 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

7 6 Bunches from PSB must be placed into the correct buckets Batch compression works only for even number of bunches Bucket number control during both transfers PSB PS 1 turn Injection bucket selection PA.DCNBINJ

8 7 DDS h128 Inj. Bucket selection MHS DDS MHS h = 1 …… RF directly to cavities (one DDS per cavity) f rev, closed loop Tagged clock f RF, inj. = 9 · MHz MHS h PL = 9 1.Sync. on h = 1, fix bucket # 2.Lock - loop on inj. synth. Shifted trains to PSB, 1 st inj. Bucket number control Synchronizing PSB and PS – 1 st injection Generate synchronous h1, h4 and h8 for PSB, while locking -loop on h9 R. Garoby, Multi-harmonic RF Source for the Anti-proton Production Beam of AD, CERN PS/RF/Note (phase loop) (injection synchro.) 4 ms/div 1. 2.Inj.

9 8 DDS h128 Inj. Bucket selection MHS DDS MHS h = 1 …… f rev, closed loop Tagged clock MHS h PL = 9 1.Sync. on h = 1, fix bucket # Shifted trains to PSB, 2 nd inj. Generate synchronous h1, h4 and h8 for PSB, while locking -loop on h9 Bucket number control RF directly to cavities (one DDS per cavity) Synchronizing PSB and PS – 2 nd injection R. Garoby, Multi-harmonic RF Source for the Anti-proton Production Beam of AD, CERN PS/RF/Note 97-10

10 9 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

11 10 Major renovation of LLRF controls Profit from global controls renovation (ACCOR) to move front-ends for PS beam controls to central building BeforeThe plan…

12 11 Major renovation of LLRF controls During…Back on… Close collaboration between BE/CO and BE/RF Profit from global controls renovation (ACCOR) to move front-ends for PS beam controls to central building E. Said and installation team

13 12 Migration of controls devices DevicesObsolete GM classNew class TimingsPTIM-VLTIM FunctionsGFASCVORB Digital bit controlsDIGIOCGDIO_B (bit) Digital selectorsDIGIOCGDIO_E (enum) Digital controlsDIGCTLCGDIO_C (cont.) Pentek synthesizerDIGCTLV MHz matrixRFMATMATRF Transparent migration 67 CVORB function channels ~220physical timing channels, ~1240 timings in total (multi-pulses) ~35Further devices: digital controls, RF synthesizer, etc. Kontron PC front-end for MIL1553 loops (all cavities) on/off/reset About 10 kilometers of new cables, but in about 250 smaller pieces

14 13 Should be sufficient for the future Should be sufficient for the near future? Controls upgrade from TG8 to CTRV: Each function with restarts now 16 instead of 8 restart timings Twice more complicated RF manipulations possible: Sequence of 16 phase loop harmonics Sequence of RF harmonics RF manipulations twice as complicated as before LS1 (2 BCMS) Ready for new RF manipulations

15 14 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

16 15 AVC 1TFB hh 200 Final Amplifier, 10 MHz Cavity, Fast Wideband FB DAC ADC DAC Gap Return Drive H - Fast wide-band feedback around amplifier (internal) Gain limited by delay - 1-turn delay feedback High gain at n f rev - Slow voltage control loop (AVC) Gain control at f RF V prog (digital) PS 10 MHz feedback overview D. Perrelet

17 16 Voltage control (AVC) loop Pre-LS1 hardware required analog voltage program Regulation characteristics not optimum for fast voltage jumps RF from beam control V prog (analog) Analog voltage control: 1.AVC loop functionality 2.Interlocks Loop filter Upgrade to fully digital implementation of AVC loop Migrate interlock part to separate surveillance hardware P. Maesen, PS/RF/Note Pre-LS1

18 17 Digital voltage control (AVC) loop Harmonic number functions PA.GSHA/B/C required for all beams RF from beam control V prog (digital) Digital PID Non-I/Q detector Digital voltage control loops integrated into 1-turn delay feedback HW Separate surveillance module to assure hardware safety M. Haase D. Perrelet Veto h (digital)

19 18 Principle of the 1-turn delay feedback Comb filter for high gain at f rev harmonics Delay circuit to correct total feedback delay to a full turn Additional notch filter to cancel feedback gain at f RF Classical feedback limited by unavoidable delay BUT: Impedance reduction of cavities only needed at f rev harmonics D. Boussard, G. Lambert, PAC83, pp

20 19 No need for: Multiple clocks, avoiding double sampling at 4 f RF and 80 f rev Wide-range clock phase locked loops External delay cables Increased resolution of signal processing from 10 to 14 bits Ready for proton beams at any harmonic number No need to start from h = 8 (limitation in old system) Compatible with all LHC-type beams Integrated electronic delay generation Possibility to raise feedback gain by firmware improvements Include a digital AVC in the firmware to replace analog hardware New 1-turn delay feedback

21 20 Flexible feedback board development D. Perrelet Versatile board: 4 ADC/DAC channels with powerful FPGA Delay line chains to complete delay of 1-turn CVORB and fast serial ports for connections Further/future applications: PS transverse feedback, coupled-bunch feedback, 1-turn delay feedback for 20/40/80 MHz systems and transverse dampers of PSB, AD, LEIR

22 21 Four new VME crates installed in building 359 (one per tuning group) Example for tuning group B (cavities C56, C66, C76 and C81): Installation All 10 MHz cavities equipped: AVC loop commissioning ongoing, then 1-turn delay feedback D. Perrelet

23 22 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

24 23 10 MHz require a tuning current of up to 3000 A to cover 2.8…10 MHz Multiple cavities in series to reduce tuning power supplies: 3+1 tuning power supplies since 1984 Two groups of 2 cavities and one big group ( ) For RF manipulations voltage limited to 40 kV per group Change tuning group configuration to Adapt to present needs 60 kV per group Rewire 3 kA cables! Change of tuning group configuration Below PS ring (inside )

25 24 To C66 Connections to C56 Rewiring 3 kA cables: before To C66 To C51 Connection box below C10-56 V. Desquiens

26 25 To C66 Connections to C56 Rewiring 3 kA cables: after To C66 To C51 Connection box below C10-56 V. Desquiens

27 26 hA: 36, 46 hB: 51, 56, 66, 76, 81, 91 hC: 86, 96 Tuning-Groups: Group 4: 11, test cavity All cavities of group tuned to same frequency Hard-wired structure of tuning groups 40 kV in three groups Frequency: Fixed tuning circuits ( )

28 27 hA: 36, 46, 51 hB: 56, 66, 76, 81 hC: 86, 91, 96 Tuning-Groups: Group 4: 11, test cavity Frequency: Fixed tuning circuits (2013-) All cavities of group tuned to same frequency Hard-wired structure of tuning groups 60 kV in three groups

29 28 Tuning group change: status and consequences Behavior of tuning groups verified before and after the change First six cavities in the ring now pulsing But: All cavities in voltage program group should be in same tuning group Now violated for almost all cycles Need to adapt timing trees ( Stevens presentation) Need to rebuilt each cycle before it can be executed! Major effort of reprogramming all RF functions Please do not just put pre-LS1 cycles in the super-cycle! Absolutely non-transparent

30 29 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

31 30 Voltage program generation: hardware matrix Pre-LS1 Dangerous single point of failure Functions and timings per group Functions and timings per cavity Hardware matrix has served from the mid 1990s until LS1 Complicated hardware with embedded micro-processor 6 analog functions + 12 timings in 11 analog function + 22 timings out Few spare boards in unknown state left

32 31 Global program Modifier grp. 1 Modifier grp. 2 Modifier grp. 3 Modifier grp. 4 Modifier grp. 5 Modifier grp. 6 × × × × × × 0…100% 0…200 kV C11C36C46C51C56C66C76C81C86C91C96 Voltage programs to cavities: Global red. × 0…100% Mapping from groups to cavities voltage programs gap relay timings Voltage program generation

33 32 New software based 10 MHz matrix New implementation guidelines: Distribution of digital voltage program data to each cavity CVORB function generator channel and CTRV timings per cavity No specific central hardware as single point of failure Only simple electronics to distribute serial data streams Move relevant parts of matrix to software virtual matrix 1.Combine functions and restart timings to so-called real-time function per voltage program group 2.Copy real time functions per group to functions per cavity Major implementation effort by P. Pera Mira and G. Kruk H. D., S. Hancock, CERN-ATS-Note TECH

34 33 Real-time function generation Voltage program modifier functions per group (with restarts) difficult to map 1.Calculate real-time functions PA.GS…RT, based on functions and timings 2.Copy only real-time (RT) functions to the functions per cavity Function with restarts Real-time function Functions per group drive no hardware anymore Possibility to virtualize later ( )

35 34 Global program Modifier grp. 1 Modifier grp. 2 Modifier grp. 3 Modifier grp. 4 Modifier grp. 5 Modifier grp. 6 × × × × × × 0…100% 0…200 kV C11C36C46C51C56C66C76C81C86C91C96 Voltage programs to cavities: Global red. × 0…100% Modifier grp. 7 Modifier grp. 8 × × Mapping from groups to cavities voltage programs gap relay timings Hardware switching of functions and timings migrated to software InCA MakeRules to copy settings from groups to cavities Integrated spare cavity selection mechanism for C11 Virtual matrix Voltage program generation

36 35 More flexibility thanks to renovated generation of voltage programs: so-called matrix New hardware to generate digital voltage program data for each cavity 8 logical groups of cavities Matrix functionality implemented in software Commissioned and essentially ready for start-up Upgraded distribution of voltage programs

37 36 Application program New application (D. Cotte, R. Maillet) Finally little changes from the operations point of view Integrated spare cavity selection, also based on InCA MakeRules

38 37 Spare cavity selection Spare cavity C11 replaces any other 10 MHz cavity, needs: Voltage program like any other cavity Harmonic number and relative phase special Previous implementation: hardware multiplexers for GFAS functions MakeRules now copy relevant functions and timings on all LSA cycles PA.GSHART PA.GSHBRT PA.GSHCRT PA.GSHDRT A, B or C PA.GSRPART PA.GSRPBRT PA.GSRPCRT PA.GSRPDRT A, B or C Tuning group of cavity to be replaced by C11 No dedicated hardware involved anymore Flexible, could even drive C11 with its own functions and timings Harmonic Relative phase

39 38 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

40 39 Glue logic for the control: linked timing Timing tree structure assures coherence between harmonic number (tuning group) and voltage programs (matrix) Old timing trees (LKTIM) incompatible with LTIM/CTRV timings Migration of X-motif application to Java needed New trees again with node and parent lists (Mbno device ID) Rules for timing and status calculation moved to InCA ………… ` Pre-LS1

41 40 Glue logic for the control: linked timing New application (D. Cotte, G. Kruk for the InCA part): Little changes from the operations point of view Comfortable handling of large timing trees, commissioning ongoing

42 41 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

43 42 Status of 20, 40, 80 and 200 MHz cavities 20 MHz cavities As before LS1 40 MHz C40-78 repaired, being commissioned Pre-driver amplifiers water-cooled Otherwise as before LS1 80 MHz cavities Pre-driver amplifiers water-cooled Otherwise as before LS1 200 MHz cavities Cavities as before LS1 Renovation of C201/206 amplifiers All high frequency cavities will be available for the start-up

44 43 Automatic tuning for 40 and 80 MHz systems Keep cavities at fixed frequency Microprocessor-based system after LS1 L. Arnaudon, S. Totos Will also pilot switching of 80 MHz cavities for protons and ions Commissioning during/after start-up

45 44 Renovation of 200 MHz amplifiers (C201/206) Before New amplifiers in BA3 (SPS) Old amplifiers High power chain C202/C203/ C204/C205 completely renovated during the 2006/2007 shutdown C201/206 followed during LS1 S. Rains, Ch. Renaud New amplifiers

46 45 Renovation of 200 MHz amplifiers (C201/206) New amplifiers ready in building 151 (C201) Amplifiers Special old types irradicated Interchangeable with SPS Interlock system More evolved then for C202-C205 Power supplies Reliability C201/206 renovated for the start-up all systems almost identical Strategy for operation after LS1: 1.Run with four 200 MHz RF systems, including C201 and C206 2.Keep two cavities as hot spares New amplifiers

47 46 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

48 47 New cavity (#25) in the PS ring M. Paoluzzi Wide-band (0.4 – 5.5 MHz, V RF = 5 kV) cavity based on Finemet material No acceleration, but damping of coupled-bunch oscillations SS02 6-cell cavity unit Accelerating gap Power amplifiers (solid state) Cavity installed in SS02, start with amplifiers on 2 gaps First installation of transistor power amplifiers close to beam in PS

49 48 Coupled-bunch oscillation damping Bunches oscillate with different phases (and amplitudes) Example of an n = 12 mode ( 206 ) Mode number n defined by phase advance from bunch-to- bunch: Coupled-bunch oscillations show up as side-bands of nf rev or (h-n)f rev = 2 n/h Frequency range of new Finemet cavity allows to damp all modes Commissioning after start-up f rf Kick Measure Kicker baseband Preferred detection

50 49 Overview Introduction RF systems for manipulations Global beam control system modifications Injection bucket control RF controls renovation 10 MHz RF system Voltage control and 1-turn delay feedback loops Tuning group restructuring 10 MHz matrix control, spare cavity selection and linked timing High-frequency and wide-band RF systems 20, 40, 80 MHz and 200 MHz Wideband cavity for longitudinal damper Summary

51 50 Summary Extensive modifications to the PS RF systems during LS1 Most of them expected to be transparent, though the underlying design changes are significant Tuning group change not transparent: Rebuilt almost all cycles Existing cycles must not be played without prior modifications! Re-commissioning of RF systems progressing Initial commissioning of new equipment, e.g., longitudinal damper will continue after start-up Stevens lecture on 10/04/2014 What to do will all this (new) stuff? Smooth start-up? Smooth start-up!

52 51 Thank you very much for your attention!


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