1. LARP Pheasant Run Oct05

2. Tune/Chromaticity/Coupling Measurement and Feedforward/Feedback Peter Cameron

3. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 EDMS, Responsibilities,... EDMS, Responsibilities,... Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

4. LARP Pheasant Run Oct05 October 2004 100 185 390 675 May 2005 - kicker costs, DAB boards,... 100 240 325 675 Oct 2005 100 137 300 537 -$206k From June 04 to Sep 05 TF has gone from $743k to $537k, or -$206k how did we get here? 1. cost over-runs in other tasks took FY05 money 2. agreement to move some TF funding from FY06 to FY05 to cover late DAB board 3. additional funding for TF in FY05 to did not materialize 4. FY06 budget was not adjusted to reflect this beyond this, there is additional cost of buying/building additional intermediate ~$286k VME-based system ~$80k, so actual difference is more like ~$286k total $k 743

5. LARP Pheasant Run Oct05 DOE Review June 05 DOE Review June 05 'deliverables' vs 'best effort' 'deliverables' vs 'best effort' "... instrumentation items are a small part of the overall program, they are well-chosen and seem to be adequately supported at present. There was a sense, however, that the instrumentation activities might be squeezed out by excessive demands from other parts of the LARP program (magnets and/or commissioning). LARP management must guard against this happening..." "... instrumentation items are a small part of the overall program, they are well-chosen and seem to be adequately supported at present. There was a sense, however, that the instrumentation activities might be squeezed out by excessive demands from other parts of the LARP program (magnets and/or commissioning). LARP management must guard against this happening..."

6. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

7. LARP Pheasant Run Oct05 Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Successful Design Review Successful Design Review established rapport enabling successful collaboration demonstrated potential to satisfy LHC TF requirements demonstrated potential to satisfy LHC TF requirements Action Items Action Items coupling - good progress coupling - good progress mains harmonics - some progress, receiving attention at RHIC, no problem at LHC? mains harmonics - some progress, receiving attention at RHIC, no problem at LHC? nested feedback loops ( - no progress (FNAL FY06task?) nested feedback loops ( tune, chrom, coupling, orbit, damper, LLRF,...) - no progress (FNAL FY06 task?) Controls System interface - complicated by DAB board delivery delay Controls System interface - complicated by DAB board delivery delay Commissioning plan - no progress? Toohig fellow? Commissioning plan - no progress? Toohig fellow?

8. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

9. LARP Pheasant Run Oct05 Boundaries Boundaries CERN EDMS document generated (at right) CERN EDMS document generated (at right) General statement General statement The US-LARP tune feedback task is to provide: the necessary instruments for the continuous measurement of tune, chromaticity and coupling in a robust way, with minimal emittance blow-up in the LHC. These instruments shall be foreseen to allow for the rapid implementation of tune feedback in the LHC, and the possibility of subsequent chromaticity and coupling feedback.

10. LARP Pheasant Run Oct05 CERN will provide: Direct Diode Detection modules BBQ front-end system NIM ADC acquisition card and crate BBQ control mezzanine BBQ acquisition mezzanine DAB64x card VME64x host computer VME64x crate beam tests at RHIC BNL will provide: field programmable gate array code C-code implementation of PLL routines C-code implementation of BBQ control routines LabVIEW control program for RHIC tests mains frequency digitizer test installation at RHIC, including a suitable pick-up, kicker and cabling necessary auxiliary instrumentation (oscilloscope, spectrum analyser etc.) beam tests at RHIC Boundaries - more detail Boundaries - more detail For the prototype system to be tested at RHIC FNAL will provide: continued R&D for various open issues

11. LARP Pheasant Run Oct05 CERN will provide: pick-ups and kickers cabling and associated infrastructure Direct Diode Detection modules BBQ front-end systems NIM ADC acquisition card and crates BBQ control mezzanines BBQ acquisition mezzanines DAB64x cards VME64x host computers & crates necessary auxiliary instrumentation (oscilloscope, spectrum analyser,..) integration of BNL C-code into the CERN controls infrastructure application programs for PLL control and measurement displays infrastructure for the real-time feedback of tune, chromaticity and coupling. BNL will provide: field programmable gate array code C-code implementation of PLL routines C-code implementation of BBQ control routines collaboration with CERN on controls integration collaboration with CERN on application programming mains frequency digitizer pre-beam and beam commissioning support Boundaries - more detail 2 Boundaries - more detail 2 For the final four systems to be installed in the LHC (four planes) FNAL will provide: TBD

12. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

13. LARP Pheasant Run Oct05 Reconfigured PLL to track projections of eigenmode 1 in both planes

14. LARP Pheasant Run Oct05 "Yun's Parameters" C-A/AP/174 - Possible phase loop for the global betatron decoupling, Y. Luo et al http://www.rhichome.bnl.gov/AP/ap_notes/cad_ap_index.htmlDefine: Q 1 = eigentune 1 Q 2 = eigentune 2 A 1,x = amplitude of eigenmode 1 in x-plane,...  1,x = phase of eigenmode 1 in x-plane,... Then these 6 parameters are a complete description of coupling: Q 1 Q 2 Q 1 Q 2 r 1 = abs(A 1,y / A 1,x ) r 2 = abs(A 2,x / A 2,y )   =  1,y -  1,x   =  2,x -  2,y   =  1,y -  1,x   =  2,x -  2,y ~ 0 ~ 0 (this is the PLL function) A 1,x A 1,y

15. LARP Pheasant Run Oct05 Q1 Q2 Qy Qx r2 r1 d2d2 d1d1 TF would break herePLL jumps eigenmodes here Yun's and Rhodri's parameters during tune crossing

16. LARP Pheasant Run Oct05 "Rhodri's Parameters" The usual coupling parameters:  - the unperturbed tune split  - the unperturbed tune split c - - the tune split due to coupling c - - the tune split due to coupling What makes them interesting in this case is that they are expressed in terms of Yun's parameters:  = abs(Q 1 -Q 2 )(1-r 1 r 2 )/(1+r 1 r 2 )  = abs(Q 1 -Q 2 )(1-r 1 r 2 )/(1+r 1 r 2 ) abs(c - ) = 2sqrt(r 1 r 2 ) abs(Q 1 -Q 2 )/(1+r 1 r 2 ) abs(c - ) = 2sqrt(r 1 r 2 ) abs(Q 1 -Q 2 )/(1+r 1 r 2 )

17. LARP Pheasant Run Oct05 Eigentunes (Q I and Q II ), set (  ) and coupling (c - ) tune splits, and unperturbed tunes (Q x,0 and Q y,0 ) for two successive ramps in RHIC. with Artus kicks without Artus kicks

18. LARP Pheasant Run Oct05 Q 1 - measured Q 2 - measured Q x - set Q y - set skew chrom at injection- momentum dependent coupling Q' skew ~ -0.3 Q' 1 ~2 Q' skew ~0.3 Q' 2 ~3

19. LARP Pheasant Run Oct05 3D on the Ramp - 1 Jan 05 dominantspacing is 180Hz 60Hz onset 60Hz end IPM every 100 turns (780 Hz)

20. LARP Pheasant Run Oct05 40dB the same 40dB 300 micron 10Hz cryostat vibration (0dB) 60Hz (-20dB) betatron line (-35dB) 720Hz x 14 (-60dB) 720Hz lines previous slide estimate ~5  at betatron line 3D resolution <~10nm

21. LARP Pheasant Run Oct05 coupling excitation is horizontal vertical horizontal

22. LARP Pheasant Run Oct05 Results from Run 5 - 3D and BBQ 3D (Direct Diode Detection) - solves dynamic range problem sensitivity ~10nm 60Hz problemsensitivity ~10nm 60Hz problem beam is excited at betatron line by line frequency harmonicsbeam is excited at betatron line by line frequency harmonics At baseband, shows up everywhere in coherent spectrum - can't escape itAt baseband, shows up everywhere in coherent spectrum - can't escape it Required modulation of dipole current at harmonic ~300 is small - a few in 10 11Required modulation of dipole current at harmonic ~300 is small - a few in 10 11 BBQ (Baseband Q measurement) - loop closed, performance superior to present RHIC system, but locks on 60Hz lines ~20dB at store 23940/720 = 33. 25 30dB above noise

23. LARP Pheasant Run Oct05 "Out of the Box" bleedthru!!! Artus vert Artus Horiz BBQ 1Hz BBQ ~80Hz lock on harmonic 29 of 720Hz, followed by complete loss of lock as tune moves away

24. LARP Pheasant Run Oct05.25.27.29.31.33 frev inj 78138 frev store 78192 720Hz harmonics inj qx.73/.27 qy.72/.28 store qx.69/.31 qy.68/.32 IPM every 100 turns lands right on working point!!!

25. LARP Pheasant Run Oct05 Summary of Chromaticity tt tt vert horiz +5 -5 dp/p of +/-10 -4 gives ~+/-100  radial modulation (RHIC&LHC) -5 +5 Q' ramp 6380 ramp 6382 ramp 6381 in RHIC modulation is at 1Hz chrom - good results

26. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

27. LARP Pheasant Run Oct05 The Approach to bench testing - two parallel paths: single resonatorsingle resonator optimize loop parametersoptimize loop parameters initial limitation - FEC capabilityinitial limitation - FEC capability get simplest system running, then optimizeget simplest system running, then optimize sampling rate, filtering, GPMs,...sampling rate, filtering, GPMs,... study mains harmonics problemstudy mains harmonics problem coupled resonatorscoupled resonators de-bug de-coupling on the benchde-bug de-coupling on the bench

28. LARP Pheasant Run Oct05 LP NCOFEC x4 A/D 28MHz D/A GPM, PET,... FFT Box varactor modulation test resonator VME Single Eigenmode Test Setup for Loop Optimization

29. LARP Pheasant Run Oct05 square-wave modulated tune FFT showing odd harmonics 20dB/decade

30. LARP Pheasant Run Oct05 Sampling frequency ~320Hz 3 pole FIR low-pass filter at 90Hz K proportional = K integral =.001 K derivative = 0 S/N ~ 20dB at 1KHz RBW Modulation depth ~.005 BBQ Closed Loop Response - Sep 2005 K 0 =.03 BW~35Hz K 0 =.01 BW~30Hz K 0 =.003 BW~26Hz K 0 =.001 BW~12Hz

31. LARP Pheasant Run Oct05 Bench test comparison 245MHz and BBQ PLLs under ~ same conditions 245MHz was full optimized BBQ was 1st iteration results are reasonable, now tweak!

32. LARP Pheasant Run Oct05 bench testing reveals a puzzle mains harmonics excite beam resonance, and this captures PLL 'mains harmonics' excite test resonator, and this repells PLL WHY?

33. LARP Pheasant Run Oct05 Summary of single resonator testing a puzzle with mains harmonics a puzzle with mains harmonics system tuning is in progress system tuning is in progress need to optimize FEC functioning need to optimize FEC functioning Concerns with implementing Coupling Feedback there will be the usual extreme time pressure during beam commissioning there will be the usual extreme time pressure during beam commissioning essential to have CF system integration fully tested before beam arrives essential to have CF system integration fully tested before beam arrives fallback - leave CF off, give magnets calculated horizontal and vertical tunes fallback - leave CF off, give magnets calculated horizontal and vertical tunes

34. LARP Pheasant Run Oct05 Single Eigenmode Test Setup for Coupling Correction NCOFEC x4 A/D 28MHz D/A GPM, PET,... FFT Box coupling VME LP eigenmode 2 eigenmode 1 decoupling bias supply mode 1 clock Results so far: we can measure coupling we can reduce coupling vias bias current need to improve biasing need to reduce bleedthru

35. LARP Pheasant Run Oct05 x4 28MHz GPM, PET,... FFT Box coupling VME Dual Eigenmode Test Setup for Coupling Correction NCO1 FEC1A/D 1D/A 1 eigenmode 2 eigenmode 1 decoupling bias supplies mode 1 clock NCO2 FEC2A/D 2 D/A 2 eigenmode 1 x4 mode 2 clock Master FEC DAC

36. LARP Pheasant Run Oct05 Dual Eigenmode Test Setup for Coupling Correction - more detail FEC1 decoupling bias supplies FEC2 Master FEC DAC coupling bias supply skew quad strength deltaSF13 skew quad strength deltaSF2

37. LARP Pheasant Run Oct05 Testing Plans in 902 - October optimize FEC load optimize FEC load optimize loop parameters optimize loop parameters complete fully functional coupling complete fully functional coupling demonstrate decoupling demonstrate decoupling in 1002 - November/December full operational installation full operational installation coupled resonators in place of pickups coupled resonators in place of pickups optimize noise and bleedthru rejection optimize noise and bleedthru rejection demonstrate decoupling demonstrate decoupling

38. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

39. LARP Pheasant Run Oct05 RHIC Run 6 Commissioning Plan (draft) DAY ONE 1. verify 3D analog front end. Adjust time constants and gains. 2. track tunes, adjust loop gains and filter bandwidths 3. measure emittance growth as a function of kicker excitation 4. main dipole 12 phase balancing study (Carl) 5. dedicated time - mod quads, measure qLoop bandwidths (Carl) 6. dedicated time - decoupling studies 6. dedicated time - decoupling studies DAY TWO 0. Vadim - assess system status, make decisions 1. bring the system on, verify tune and coupling measurements from previous day 2. dedicated time - turn on tune feedback with decoupled machine 3. dedicated time - modulate skew quads, measure kLoop bandwidths (Carl) 4. 12 phase balancing, explore effect of mains harmonics on tune tracking 4. 12 phase balancing, explore effect of mains harmonics on tune tracking DAY THREE 0. Vadim - assess system status, make decisions 1. dedicated time - turn on tune feedback with decoupled machine 2. dedicated time - turn on coupling feedback with tune feedback off 3. dedicated time - turn on tune and coupling feedback simultaneously, explore DAY FOUR 0. Vadim - assess system status, make decisions 1. dedicated time - turn on feedback, explore the parameter space 2. explore effect of mains harmonics on tune tracking

40. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

41. LARP Pheasant Run Oct05 Milestones - Pt. Jeff Apr 05 subsequent changes in gold Apr 05 - PDR Jun 05 - finalize prototype system architecture move from DAB to VME for prototype Nov 05 - prototype (4 planes) ready for RHIC beam in VME Feb 06 - deliver 2 planes to CERN for SPS testing in DAB Apr 06 - FDR May 06 - SPS testing, initial Controls integration (FESA) Jun 06 - finalize architecture Nov 06 - final system (4 planes) ready for RHIC beam Feb 07 - deliver final system to CERN, system integration and testing Summer 07 - system commissioning with beam

42. LARP Pheasant Run Oct05 Outline Outline TF budget in general TF budget in general Summary of Pt. Jeff Apr 05 Summary of Pt. Jeff Apr 05 Boundaries Boundaries Results RHIC Run 5 Results RHIC Run 5 Bench Test Results Bench Test Results Plans for RHIC Run 6 Plans for RHIC Run 6 Schedule Schedule Budget in detail Budget in detail

43. LARP Pheasant Run Oct05 Budget in detail (note - Budget in detail (note - BNL paid over 50% of system development costs since LARP inception) RHIC Run 6 task list: C-code programming (1 man-month) FEC programming (2 man-months) hardware development and integration (3 man-months) evaluate VME-based system with beam (3 man-months) SPS (Feb 06) - 2 planes for May testing DAB vXworks drivers (2 man-months) FEC programming (2 man-months) FPGA PLL code (4 man-months) hardware development and integration (2 man-months) FESA integration at CERN (2 man-months) Final LHC system ready for RHIC beam (Nov 06) vXworks, FEC, PFGA programming (3 man-months) hardware development and integration (2 man-months)

44. LARP Pheasant Run Oct05 Budget FY04-FY06 has decreased by ~$206K (from $743k to $537k) Budget FY04-FY06 has decreased by ~$206K (from $743k to $537k) Cost has increased ~ $80K (VME system) Cost has increased ~ $80K (VME system) FY06 projected budget labor - 2 FTEs $426K material $40K material (owed BNL CAD from FY05) $40K labor (owed BNL CAD from FY05) $40K FNAL (assuming availability of Tan) $25K travel $15K total$586k presently allotted$300k