Wideband Feedback Systems Ideas for continuity in the LARP2 Era J.D. - - PowerPoint PPT Presentation

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Wideband Feedback Systems

Ideas for continuity in the LARP2 Era J.D. Fox1

LARP Ecloud Contributors:

• J. Cesaratto1, J. Dusatko1, J. D. Fox1, J. Goldfield1, J. Olsen1, M. Pivi1, N. Redmon1, C.

Rivetta1, O. Turgut1

• D. Aguilera2, G. Arduini2, H. Bartosik2, S. Calvo2,W. Hofle2, G. Iadarola2, G. Kotzian2, K.

Li2, E. Montesinos2, G. Rumolo2, B. Salvant2, U. Wehrle2, M. Wendt2, C. Zanini2

• S. De Santis3, H. Qian3
• D. Alesini4, A. Drago4, S. Gallo4, F. Marcellini4, M. Zobov4

M.Tobiyama5

1Accelerator Research Department, SLAC 2BE-ABP-ICE Groups, CERN 3Lawrence Berkeley Laboratory 4LNF-INFN 5KEK

• J. D. Fox

CM 26 May 2016 1

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

WBFS for intra-bunch Instability Control

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Control of Ecloud and Impedance-driven transverse Intra-bunch instabilities - efforts since 2009 GHz Bandwidth Digital Signal Processing via reconfigurable architecture beam studies - excitations studies- demo system with feedback SLAC and CERN resources , Opportunity for Graduate Student participation, Ph.D. Thesis Extensive simulation and modeling effort Testbed for concept validation, data to estimate full-function system for any machine

• J. D. Fox

CM 26 May 2016 2

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

3 coupled research areas

Technology of Feedback System ( Engineering)

Receiver, equalizer, pickup, Frequency/time response and noise floor A/D, D/A and DSP system functionality Control filters, diagnostics User Interface and operational flexibility Timing and Synchronization - functionality, flexibility, synchronization with energy ramp Power Amplifiers - frequency, time response, power output Beam Kickers, bandwidth, shunt impedance, added broadband impedance

Studies of Feedback on Beam Dynamics ( Beam Physics)

Active machine measurement program Development of techniques to measure performance Limited function Demo system, validate concepts Development of special beams (low intensity, linear lattice) for feedback tests

Measure Beam/System responses, compare with Simulation models ( Control Theory)

FIR and Maxtrix Control (MIMO) Methods for Q26, Q20 SPS Optics Development of MD/simulation data analysis methods Validate measurements against models Reduced Model and Control design formalism ( Ph.D. Thesis) Evaluate architecture (two pickup/two kicker system advantages)

• J. D. Fox

CM 26 May 2016 3

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Potential Applications at CERN (W. Hofle, K. Li, et al)

PS:

• Instability for high intensity TOF beams

SPS:

• Single bunch vertical instability for high

intensity 25 ns beam

LHC:

• Instabilities at injection for nominal 25

ns beam

• Instabilities at flat top for nominal 25 ns

beam

• Control
• f

the doublet beam for scrubbing

HL-LHC:

• Instabilities from crab cavity HOMs

Required bandwidth Rise time PS (TOF) ~ 800 MHz 50 turns SPS (h plane) ~ 20 MHz 750 turns SPS (v plane) 500 MHz 150 turns LHC (injection) 2 GHz 250 turns LHC ( squeeze) > 20 MHz ? 10’000 turns LHC ( doublet) > 100 MHz ? 50 turns HL-LHC (crabs) 1.75 GHz 10’000 turns

• W. Hofle / K. Li Transverse Feedback in the HL-LHC Era 5th Joint HighLumi LHC - LARP Meeting

28.10.2015 29

Instabilities: Potential for New Feedbacks

See K. Li, 15.10.2015, LIU-HighLumi Day, https://indico.cern.ch/event/437662/

• J. D. Fox

CM 26 May 2016 4

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Where Are we today? What is needed in FY17 and beyond?

Today -Demonstrator hardware system, upgraded post LS1

Mode 0 control demonstrated Two stripline kickers in place, 4x250W 1 Ghz amplifiers FIR based single, doublet, train controllers Many control concepts simulated, studied via head-tail, reduced models Ready for intensive MD program with strong, coupling to CERN ABP groups CERN is investing in vacuum kicker structures, cable plant, amplifiers and people

What’s not there?

No energy ramp synchronization -deferred due to resources Slotline kicker - delayed due to resources Data to understand limits of FIR control for Q20 and Q20-like optics Simulations/studies of growth rates vs. energy in ramp

What do we need to do in FY2017, and beyond, via LARP2

CERN September 2016 Review report will guide Continued MD studies with HL-like beams Continued refinement, tests of robust controllers Slotline fabrication, installation, commissioning Validate measurements against models full-featured architecture study, design of full featured platform study value to LHC-HL complex, propose operational implementations

• J. D. Fox

CM 26 May 2016 5

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Research and Technology Timeline from DOE review

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Task, resources, M&S items estimated multiple times in DOE and CERN Reviews Manpower estimated many times, budgeted as part of project preparation

• J. D. Fox

CM 26 May 2016 6

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Scenario 1 - $100K/year

This is a small fraction of existing FY2016 effort

MD efforts require travel, realistic % FTE to take data, analyze data Technology efforts require realistic % FTE engineering

What could be done

lifeline support for Graduate Ph.D. Thesis - wrap up limited travel for Student effort is mostly simulation studies, simulation of control techniques minimal MD effort or analysis of data

Other Impacts

Engineering, Beam Physics team transition to other projects Frozen state of Demo system Loss of continuity and project momentum Difficult to re-create team if funding available in future year

Out-of-Box Ideas- possible use of US-Japan, outside NSF , DOE or GARD funds, CERN direct support to help with project continuity

• J. D. Fox

CM 26 May 2016 7

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Scenario 2 - $250K/year

This is a fraction of existing FY2016 effort

difference from Scenario #1 is small fractional Staff FTE MD efforts require travel, realistic % FTE to take data, analyze data Technology efforts require realistic % FTE engineering

What could be done

Support for Graduate Ph.D. Thesis effort and supervision roughly 25% FTE Accelerator Physics and travel funding for MD effort Simulation studies of control methods, limits of FIR techniques Travel for limited MD studies coordination on fabrication, testing and commissioning of slot line kicker

Other Impacts

Minimal accelerator Physics time to do MD studies, analysis, and Engineering Staff transitions to other projects Frozen state of Demo system Difficult to expand or continue Demo System or hardware effort if funding available in future year

Out-of-Box Ideas- possible use of US-Japan, outside NSF , DOE or GARD funds, CERN funds to help support project Technology R&D . Toohig Fellow could be significant if extra funds for a Fellow were available

• J. D. Fox

CM 26 May 2016 8

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Scenario 2 - $500K/year

This is a fraction of what was FY2015 effort

difference from Scenario #2 - possible to have fractional Staff and Engineering FTE MD efforts require travel, realistic % FTE to take data, analyze data Technology efforts require realistic % FTE engineering

What could be done

Support for Graduate Ph.D. Thesis effort and supervision roughly 25% FTE Accelerator Physics and travel funding for MD effort Roughly 25% Engineering FTE to add features to Demo system Simulation studies of control methods, limits of FIR techniques Travel for MD studies, small M&S for energy ramp synchronization coordination on fabrication, testing and commissioning of slot line kicker paper design study of next hardware platform based on ideas from MD and simulation Feasibility studies for beam tests at PS or LHC

Other Impacts

Minimal accelerator Physics time to do MD studies, analysis Engineering Staff - fractional time means schedule conflicts with primary tasks Limited bug fixes, modest features for Demo system. Travel required to do any updates, adds costs No full-featured prototype for realistic tests in SPS or LHC Out-of-Box Ideas- possible use of US-Japan, outside NSF , DOE or GARD funds to help support project with possible new hardware platform, wider bandwidth ADC/DAC

• technology. Toohig fellow with additional support could be significant resource
• J. D. Fox

CM 26 May 2016 9

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Technology Development, Beam Measurements, Simulation Models, and Graduate Education

• J. D. Fox

CM 26 May 2016 10

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Goals Before the September 2016 Review

Use MD studies summer 2016 to validate system models Estimate system requirements for robust instability control at SPS, LHC Proof of principle using limited Kicker power Validate damping as achieved consistent with engineering design System Conceptual Design Report FY16 priorities

Commission second kicker, wideband amplifiers MD efforts - explore excitation, damping of internal beam modes MD Data Analysis methods Explore/validate Q20 control methods, compare models with physical measurements Demonstrate 64 bunch train controller, doublet controller

If possible, Slotline kicker design ready for CERN fabrication

• J. D. Fox

CM 26 May 2016 11

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Wideband Feedback - Implementation in LHC

Architecture being developed is reconfigurable! Processing unit implementation in LHC similar to SPS: SPS LHC RF frequency (MHz) 200 400 frev (kHz) 43.4 11.1 # bunches/beam 288 2808 # samples/bunch 16 16 # filter taps/sample 16 16 Multi-Accum (GMac/s) 3.2 8 LHC needs more multiply-accumulation operation resources because of # of bunches, but reduced frev allows longer computation time (assuming diagonal control).

Simply need hardware with more resources Similar architecture can accommodate needs of both SPS and LHC.

Still need kicker of appropriate bandwidth with acceptable impedance for LHC. Learn from SPS experience.

• J. D. Fox

CM 26 May 2016 12

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Looking at HL-LHC (W.Hofle, K. Li, et al)

Instabilities hardly manageable

LHC:

• The pure current impedance model is

expected to give rise to instabilities that can be handled by current means of stabilization (octupoles, perfect damper) for single as well as coupled bunch.

• When other sources of instability are

folded in, the requirements on the means of stabilization drastically increase.

• Mid/end squeeze – not cured by present
• damper. Likely due to e-cloud –

limitations to be re-assessed after more conditioning.

• Injection – instabilities and blow-up
• High Lumi LHC will see 25 ns stability

issues combined with high intensity bunch currents be prepared

• E-cloud instabilities force operation at chroma

~15, octupoles ~20A, damper gain ~0.25 (~ 10 turns) – highly sensitive to damper settings and coupling

• Change of WP required – Qh: 0.275, Qv: 0.295
• Still sporadically blow-up observed

Rise time: ? Frequency: ~ 2 GHz

• W. Hofle / K. Li Transverse Feedback in the HL-LHC Era 5th Joint HighLumi LHC - LARP Meeting

28.10.2015 32

• J. D. Fox

CM 26 May 2016 13

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

1 GHz Wideband Slotline kicker development

CERN, LNF-INFN, LBL and SLAC Collaboration. Design Report SLAC-R-1037 similar in concept to stochastic cooling pickups, run as kicker Advantage - length allows Shunt Impedance AND Bandwidth

• J. Cesaratto, S. Verdu, M.Wendt, D. Aguilera electrical/mechanical design and HFSS
• ptimization (final design in process for 2016 CERN fabrication)

Shapal spacers, 12 mm diameter Coaxial-to-stripline transition, based on Kyocera RF UHV feedthrough 40 coupling slots, 70 x 12.5 mm, 25 mm pitch WR-430 waveguide, 109.22 x 54.61 mm, 1000 mm long Stripline electrode, 68 x 5 mm, 1000 mm long Beam pipe, 132 x 52.3 mm,

• J. D. Fox

CM 26 May 2016 14

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Wideband Feedback - Benefits for HL LHC

CERN LIU-SPS High Bandwidth Transverse Damper Review Multiple talks, on impacts of Ecloud, TMCI, Q20 vs. Q26 optics, Scrubbing fill, etc. Particular attention to talk from G. Rumolo !"#$%&&"'()*#+#' !"!"#$%&'&!()*+!,-./0)/1+!2-3456!758)50!2-9:!;<7=:!>?!@AB9!C?D>! # #

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• J. D. Fox

CM 26 May 2016 15

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

SPS wideband Feedback - helps with Ecloud instability control, applicable for possible TMCI

Feedback is complementary to coatings, grooves, other methods Reduces need for chromaticity as cure for instability, low chromaticity beneficial for beam quality Provides a measure of flexibility in choice of operating parameters, lattice options Emittance growth from any coherent fast motion can be suppressed

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• J. D. Fox

CM 26 May 2016 16

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

SPS wideband Feedback - value for Scrubbing Fill

Comments from G. Rumolo

Scrubbing Fill - 5 ns bunch separation Exceeds bandwidth of existing transverse damper Fill suffers from transverse instabilities and enhanced Ecloud Wideband feedback enhances scrubbing, potential use of this fill in LHC

Time [µs] Time [s] 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2

Time [µs] Time [s] 0.15 0.16 0.17 0.18 0.19 0.2 0.5 1 1.5 2

• H. Bartosik, G. Iadarola, et al,

Thanks to J. Esteban-Müller et al.

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• J. D. Fox

CM 26 May 2016 17

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Wideband Feedback - Applications to the PS

PS might benefit from wideband transverse feedback Reconfigurable, programmable architecture can target PS Comments from G. Rumolo

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• A. Blas, K. Li, N. Mounet, G. Sterbini, et al.
• J. D. Fox

CM 26 May 2016 18

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Wideband Feedback - Applications to the LHC (G. Rumolo)

Reconfigurable, programmable architecture, technology applicable to LHC

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• J. D. Fox

CM 26 May 2016 19

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

Wideband Feedback - Beam Diagnostic Value

processing system architecture/technology

reconfigurable platform, 4 - 8 GS/s data rates snapshot memories, excitation memories applicable to novel time and frequency domain diagnostics Feedback and Beam dynamics sensitive measure of impedance and other dynamic effects

Complementary to existing beam diagnostic techniques

• J. D. Fox

CM 26 May 2016 20

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

June 2013 FNAL Review Proposed Manpower Timeline

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• J. D. Fox

CM 26 May 2016 21

Background Applications to HL-LHC LARP2 Proposal Three Scenarios Benefits for HL LHC Budget

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• J. D. Fox

CM 26 May 2016 22