larp pheasant run oct05. tune/chromaticity/coupling measurement and feedforward/feedback peter...

LARP Pheasant Run Oct05LARP Pheasant Run Oct05


Tune/Chromaticity/Tune/Chromaticity/CouplingCoupling

Measurement and Measurement and Feedforward/FeedbackFeedforward/Feedback

Peter CameronPeter Cameron


OutlineOutline • TF budget in generalTF budget in general• Summary of Pt. Jeff Apr Summary of Pt. Jeff Apr 0505• EDMS, EDMS, Responsibilities,...Responsibilities,...• Results RHIC Run 5Results RHIC Run 5• Bench Test ResultsBench Test Results• Plans for RHIC Run 6Plans for RHIC Run 6• ScheduleSchedule• Budget in detailBudget in detail


October 2004 100 185 390 675 May 2005 - kicker costs, DAB boards,... 100 240 325 675Oct 2005 100 137 300 537From June 04 to Sep 05 TF has gone from $743k to $537k, or -$206k-$206khow did we get here?1. cost over-runs in other tasks took FY05 money2. agreement to move some TF funding from FY06 to FY05 to cover late DAB board3. additional funding for TF in FY05 to did not materialize4. FY06 budget was not adjusted to reflect this

beyond this, there is additional cost of buying/building additional intermediate VME-based system ~$80k, so actual difference is more like ~$286k~$286k

total $k743


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


OutlineOutline • TF budget in generalTF budget in general• Summary of Pt. Jeff Apr Summary of Pt. Jeff Apr 0505• BoundariesBoundaries• Results RHIC Run 5Results RHIC Run 5• Bench Test ResultsBench Test Results• Plans for RHIC Run 6Plans for RHIC Run 6• ScheduleSchedule• Budget in detailBudget in detail


Summary of Pt. Jeff Apr 05Summary of Pt. Jeff Apr 05 • Successful Design Review Successful Design Review

• established rapport enabling successful established rapport enabling successful collaborationcollaboration• demonstrated potential to satisfy LHC TF demonstrated potential to satisfy LHC TF requirementsrequirements

• Action ItemsAction Items• coupling - good progresscoupling - good progress• mains harmonics - some progress, receiving mains harmonics - some progress, receiving attention attention at RHIC, no problem at LHC?at RHIC, no problem at LHC?• nested feedback loops nested feedback loops ((tune, chrom, coupling, orbit,

damper, LLRF,...) - no progress (FNAL - no progress (FNAL FY06FY06 task?)task?)• Controls System interface - complicated by DAB Controls System interface - complicated by DAB board board delivery delaydelivery delay• Commissioning plan - no progress? Toohig Commissioning plan - no progress? Toohig fellow?fellow?


BoundariesBoundaries • CERN EDMS document CERN EDMS document generated (at right)generated (at right)• General statementGeneral statementThe US-LARP tune feedback task is to The US-LARP tune feedback task is to provide:provide:

the necessary instruments for the the necessary instruments for the continuous measurement of tune, continuous measurement of tune, chromaticity and coupling in a robust chromaticity and coupling in a robust way, with minimal emittance blow-up way, with minimal emittance blow-up in the LHC.in the LHC.

These instruments shall be foreseen to These instruments shall be foreseen to allow for the rapid implementation of tune allow for the rapid implementation of tune feedback in the LHC, and the possibility of feedback in the LHC, and the possibility of subsequent chromaticity and coupling subsequent chromaticity and coupling feedback.feedback.


CERN will provide:CERN will provide:

Direct Diode Detection modulesDirect Diode Detection modulesBBQ front-end systemBBQ front-end systemNIM ADC acquisition card and NIM ADC acquisition card and cratecrateBBQ control mezzanineBBQ control mezzanineBBQ acquisition mezzanineBBQ acquisition mezzanineDAB64x cardDAB64x cardVME64x host computerVME64x host computerVME64x crateVME64x cratebeam tests at RHICbeam tests at RHIC

BNL will provide:BNL will provide:

field programmable gate array codefield programmable gate array codeC-code implementation of PLL routinesC-code implementation of PLL routinesC-code implementation of BBQ control C-code implementation of BBQ control routinesroutinesLabVIEW control program for RHIC testsLabVIEW control program for RHIC testsmains frequency digitizermains frequency digitizertest installation at RHIC, including a test installation at RHIC, including a suitable suitable pick-up, kicker and pick-up, kicker and cablingcablingnecessary auxiliary instrumentation necessary auxiliary instrumentation (oscilloscope, spectrum analyser etc.)(oscilloscope, spectrum analyser etc.)beam tests at RHICbeam tests at RHIC

Boundaries - more detailBoundaries - more detail For the prototype system to be tested at For the prototype system to be tested at RHICRHIC

FNAL will provide: FNAL will provide: continued R&D for various open continued R&D for various open

issuesissues


CERN will provide:CERN will provide:pick-ups and kickerspick-ups and kickerscabling and associated infrastructurecabling and associated infrastructureDirect Diode Detection modulesDirect Diode Detection modulesBBQ front-end systemsBBQ front-end systemsNIM ADC acquisition card and cratesNIM ADC acquisition card and cratesBBQ control mezzaninesBBQ control mezzaninesBBQ acquisition mezzaninesBBQ acquisition mezzaninesDAB64x cardsDAB64x cardsVME64x host computers & cratesVME64x host computers & cratesnecessary auxiliary instrumentation necessary auxiliary instrumentation

(oscilloscope, spectrum (oscilloscope, spectrum analyser,..) analyser,..) integration of BNL C-code into the integration of BNL C-code into the CERN CERN controls infrastructurecontrols infrastructureapplication programs for PLL control application programs for PLL control and and measurement displaysmeasurement displaysinfrastructure for the real-time infrastructure for the real-time feedback of feedback of tune, chromaticity and tune, chromaticity and coupling.coupling.

BNL will provide:BNL will provide:

field programmable gate array field programmable gate array codecodeC-code implementation of PLL C-code implementation of PLL routinesroutinesC-code implementation of BBQ C-code implementation of BBQ control routinescontrol routinescollaboration with CERN on collaboration with CERN on controls controls integrationintegrationcollaboration with CERN on collaboration with CERN on application programmingapplication programmingmains frequency digitizermains frequency digitizerpre-beam and beam pre-beam and beam commissioning commissioning supportsupport

Boundaries - more detail 2Boundaries - more detail 2 For the final four systems to be installed in the LHC (four For the final four systems to be installed in the LHC (four planes)planes)

FNAL will provide: FNAL will provide:

TBDTBD


Reconfigured PLL to track projections of eigenmode 1 in both planes


"Yun's "Yun's Parameters"Parameters"

C-A/AP/174 - Possible phase loop for the global betatron decoupling, C-A/AP/174 - Possible phase loop for the global betatron decoupling, Y. Luo et alY. Luo et al

http://www.rhichome.bnl.gov/AP/ap_notes/cad_ap_index.htmlhttp://www.rhichome.bnl.gov/AP/ap_notes/cad_ap_index.html

Define:Define:

QQ11 = eigentune 1 = eigentune 1 Q Q22 = eigentune 2 = eigentune 2

AA1,x1,x = amplitude of eigenmode 1 in x-plane,... = amplitude of eigenmode 1 in x-plane,...

1,x1,x = phase of eigenmode 1 in x-plane,... = phase of eigenmode 1 in x-plane,...

Then these 6 parameters are a complete description of coupling:Then these 6 parameters are a complete description of coupling:

QQ11 QQ22

rr11 = abs(A = abs(A1,y1,y / A / A1,x 1,x ) ) rr22 = abs(A = abs(A2,x2,x / A / A2,y 2,y ) )

= = 1,y1,y - - 1,x1,x = = 2,x2,x - - 2,y2,y ~ 0 ~ 0 (this is the PLL function)

A1,x

A1,y


Q1

Q2

QyQx

r2

r1d2

d1

TF would break here PLL jumps eigenmodes here

Yun's and Rhodri's parameters during tune crossing


"Rhodri's "Rhodri's Parameters"Parameters"The usual coupling parameters:The usual coupling parameters:

• - the unperturbed tune split- the unperturbed tune split• cc-- - the tune split due to coupling - the tune split due to coupling

What makes them interesting in this What makes them interesting in this case is that they are expressed in case is that they are expressed in terms of Yun's parameters:terms of Yun's parameters:• = abs(Q= abs(Q11-Q-Q22)(1-r)(1-r11rr22)/(1+r)/(1+r11rr22))

• abs(cabs(c--) = 2sqrt(r) = 2sqrt(r11rr22) abs(Q) abs(Q11-Q-Q22)/(1+r)/(1+r11rr22))


Eigentunes (QEigentunes (QII and Q and QIIII), ),

set (set () and coupling (c) and coupling (c--) tune splits, ) tune splits, and unperturbed tunes (Qand unperturbed tunes (Qx,0x,0 and Q and Qy,0y,0) )

for two successive ramps in RHIC.for two successive ramps in RHIC.

with Artus kicks without Artus kicks


QQ1 1 - measured- measured

QQ2 2 - measured- measured

QQx x - set- set

QQy y - set- set

skew chrom at injection-skew chrom at injection-momentum dependent couplingmomentum dependent coupling

Q'Q'skew skew ~ -0.3~ -0.3

Q'Q'1 1 ~2~2

Q'Q'skew skew ~0.3~0.3

Q'Q'2 2 ~3~3


3D on the Ramp - 1 Jan 3D on the Ramp - 1 Jan 05 05

dominant dominant

spacing spacing

is 180Hzis 180Hz

60Hz onset60Hz onset

60Hz end60Hz end

IPM everyIPM every

100 turns100 turns

(780 Hz)(780 Hz)


40dB40dB

the the same same 40dB40dB

300 micron 300 micron 10Hz cryostat 10Hz cryostat vibration vibration (0dB)(0dB)

60Hz (-20dB)60Hz (-20dB)

betatron line (-betatron line (-35dB)35dB)

720Hz x 14 (-720Hz x 14 (-60dB)60dB)

720Hz 720Hz lineslines

previouprevious s slide slide

estimate ~5estimate ~5 at betatron at betatron lineline 3D resolution <~10nm 3D resolution <~10nm


coupling excitation is coupling excitation is horizontal horizontal

verticalvertical

horizontalhorizontal


Results from Run 5 - 3D and Results from Run 5 - 3D and BBQBBQ

3D (Direct Diode Detection) - 3D (Direct Diode Detection) - solves dynamic range problemsolves dynamic range problem• sensitivity ~10nm 60Hz problemsensitivity ~10nm 60Hz problem• beam is excited at betatron line by beam is excited at betatron line by

line frequency harmonicsline frequency harmonics• At baseband, shows up everywhere At baseband, shows up everywhere

in coherent spectrum - can't escape in coherent spectrum - can't escape itit

• Required modulation of dipole Required modulation of dipole current at harmonic ~300 is small - current at harmonic ~300 is small - a few in 10a few in 101111

BBQ (Baseband Q measurement) -BBQ (Baseband Q measurement) -loop closed, performance loop closed, performance superior to present RHIC superior to present RHIC system, but locks on 60Hz linessystem, but locks on 60Hz lines

~20dB at store~20dB at store

23940/720 = 33.23940/720 = 33.252530dB above noise30dB above noise


"Out of the Box""Out of the Box"

bleedthru!!!bleedthru!!!

Artus vertArtus vert

Artus HorizArtus Horiz

BBQ 1HzBBQ 1Hz

BBQ ~80HzBBQ ~80Hz

lock on harmonic 29 lock on harmonic 29

of 720Hz, followed by of 720Hz, followed by

complete loss of lock complete loss of lock

as tune moves awayas tune moves away

LARP Pheasant Run Oct05LARP Pheasant Run Oct05.25 .27 .29 .31 .33

.25 .2

7 .2

9 .

31 .3

3

frev inj78138frev store78192

720Hzharmonics

injqx .73/.27qy .72/.28

storeqx .69/.31qy .68/.32

IPM every 100 turns lands right on working point!!!


Summary of Summary of ChromaticityChromaticity

t

t

vert

horiz

+5

-5

dp/p of +/-10-4 gives ~+/-100 radial modulation (RHIC&LHC)

-5

-5

+5

+5

Q'

Q'

Q'ramp 6380

ramp 6382

ramp 6381

in RHIC modulation is at 1Hz

chrom - good results


The Approach to bench testing - two The Approach to bench testing - two parallel paths: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


LP

NCO FEC

x4

A/D

28MHz

D/A

GPM, PET,...

FFTBox

varactormodulation

test resonator

VME

Single Eigenmode Test Setupfor Loop Optimization


square-wave square-wave modulated tunemodulated tune

FFT showing odd FFT showing odd harmonicsharmonics

20dB/decade20dB/decade


Sampling frequency ~320Hz 3 pole FIR low-pass filter at 90HzKproportional = Kintegral = .001Kderivative = 0S/N ~ 20dB at 1KHz RBWModulation depth ~ .005

BBQ Closed Loop Response - Sep 2005

K0=.03BW~35Hz

K0=.01BW~30Hz

K0=.003BW~26Hz

K0=.001BW~12Hz


Bench test comparisonBench test comparison245MHz and BBQ PLLs245MHz and BBQ PLLsunder ~ same conditionsunder ~ same conditions

245MHz was full optimized245MHz was full optimizedBBQ was 1st iterationBBQ was 1st iteration

results are reasonable, results are reasonable, now tweak!now tweak!


bench testing reveals a bench testing reveals a puzzlepuzzle

mains harmonics mains harmonics excite beam excite beam

resonance, and this resonance, and this captures PLLcaptures PLL

'mains harmonics' 'mains harmonics' excite test excite test

resonator, and this resonator, and this repells PLLrepells PLL

WHY?WHY?


Summary of single resonator testingSummary of single resonator testing• a puzzle with mains harmonicsa puzzle with mains harmonics• system tuning is in progresssystem tuning is in progress• need to optimize FEC functioningneed to optimize FEC functioning

Concerns with implementing Coupling FeedbackConcerns with implementing Coupling Feedback• there will be the usual extreme time pressure during there will be the usual extreme time pressure during beam commissioningbeam commissioning• essential to have CF system integration fully tested essential to have CF system integration fully tested before beam arrivesbefore beam arrives• fallback - leave CF off, give magnets calculated fallback - leave CF off, give magnets calculated horizontal and vertical tuneshorizontal and vertical tunes


Single Eigenmode Test Setupfor Coupling Correction

NCO FEC

x4

A/D

28MHz

D/A

GPM, PET,...

FFTBox

coupling

VME

LP

LP

eigenmode 2

eigenmode 1

decouplingbias 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


x4

28MHzGPM, PET,...

FFTBox

coupling

VME

Dual Eigenmode Test Setupfor Coupling Correction

NCO1 FEC1

A/D 1D/A 1

eigenmode 2

eigenmode 1

decouplingbias supplies

mode 1 clock

NCO2 FEC2

A/D 2D/A 2

eigenmode 1

x4mode 2 clock

MasterFEC

DAC


Dual Eigenmode Test Setupfor Coupling Correction - more detail

FEC1

decouplingbias supplies

FEC2

MasterFEC

DAC

coupling bias supply

skew quad strength deltaSF13

skew quad strength deltaSF2


Testing PlansTesting Plans

in 902 - Octoberin 902 - October• optimize FEC loadoptimize FEC load• optimize loop parametersoptimize loop parameters• complete fully functional couplingcomplete fully functional coupling• demonstrate decouplingdemonstrate decoupling

in 1002 - November/Decemberin 1002 - November/December• full operational installationfull operational installation• coupled resonators in place of pickupscoupled resonators in place of pickups• optimize noise and bleedthru rejectionoptimize noise and bleedthru rejection• demonstrate decouplingdemonstrate decoupling


RHIC Run 6 Commissioning Plan (draft)RHIC Run 6 Commissioning Plan (draft)DAY ONEDAY ONE1. verify 3D analog front end. Adjust time constants and gains. 1. verify 3D analog front end. Adjust time constants and gains. 2. track tunes, adjust loop gains and filter bandwidths2. track tunes, adjust loop gains and filter bandwidths3. measure emittance growth as a function of kicker excitation3. measure emittance growth as a function of kicker excitation4. main dipole 12 phase balancing study (Carl)4. main dipole 12 phase balancing study (Carl)5. dedicated time - mod quads, measure qLoop bandwidths (Carl) 5. dedicated time - mod quads, measure qLoop bandwidths (Carl) 6. dedicated time - decoupling studies 6. dedicated time - decoupling studies DAY TWO DAY TWO 0. Vadim - assess system status, make decisions0. Vadim - assess system status, make decisions1. bring the system on, verify tune and coupling measurements from 1. bring the system on, verify tune and coupling measurements from

previous dayprevious day2. dedicated time - turn on tune feedback with decoupled machine2. dedicated time - turn on tune feedback with decoupled machine3. dedicated time - modulate skew quads, measure kLoop bandwidths 3. dedicated time - modulate skew quads, measure kLoop bandwidths

(Carl)(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 THREEDAY THREE0. Vadim - assess system status, make decisions0. Vadim - assess system status, make decisions1. dedicated time - turn on tune feedback with decoupled machine1. dedicated time - turn on tune feedback with decoupled machine2. dedicated time - turn on coupling feedback with tune feedback off2. dedicated time - turn on coupling feedback with tune feedback off3. dedicated time - turn on tune and coupling feedback simultaneously, 3. dedicated time - turn on tune and coupling feedback simultaneously,

exploreexploreDAY FOURDAY FOUR0. Vadim - assess system status, make decisions0. Vadim - assess system status, make decisions1. dedicated time - turn on feedback, explore the parameter space 1. dedicated time - turn on feedback, explore the parameter space 2. explore effect of mains harmonics on tune tracking2. explore effect of mains harmonics on tune tracking


Milestones - Pt. Jeff Apr 05Milestones - Pt. Jeff Apr 05subsequent changes in goldsubsequent changes in goldApr 05 - PDRApr 05 - PDRJun 05 - finalize prototype system architecture Jun 05 - finalize prototype system architecture

move from DAB to VME for prototypemove from DAB to VME for prototypeNov 05 - prototype (4 planes) ready for RHIC beam Nov 05 - prototype (4 planes) ready for RHIC beam in in

VMEVMEFeb 06 - deliver 2 planes to CERN for SPS testing Feb 06 - deliver 2 planes to CERN for SPS testing in DABin DABApr 06 - FDR Apr 06 - FDR May 06 - SPS testing, initial Controls integration (FESA)May 06 - SPS testing, initial Controls integration (FESA)Jun 06 - finalize architectureJun 06 - finalize architectureNov 06 - final system (4 planes) ready for RHIC beamNov 06 - final system (4 planes) ready for RHIC beamFeb 07 - deliver final system to CERN, system Feb 07 - deliver final system to CERN, system

integration and testingintegration and testingSummer 07 - system commissioning with beamSummer 07 - system commissioning with beam


Budget in detailBudget in detail (note -(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)


• Budget FY04-FY06 has decreased by Budget FY04-FY06 has decreased by ~$206K~$206K (from $743k to $537k)(from $743k to $537k)

• Cost has increased ~ $80K (VME Cost has increased ~ $80K (VME system)system)

FY06 projected budgetFY06 projected budget labor - 2 FTEs labor - 2 FTEs $426K$426Kmaterial material $40K $40Kmaterial (owed BNL CAD from FY05) material (owed BNL CAD from FY05) $40K $40Klabor (owed BNL CAD from FY05) labor (owed BNL CAD from FY05) $40K $40KFNAL (assuming availability of Tan)FNAL (assuming availability of Tan) $25K $25Ktravel travel $15K $15K

total $586kpresently allotted $300k

larp pheasant run oct05. tune/chromaticity/coupling measurement and feedforward/feedback peter...

Documents

boundaries results rhic

detaillarp pheasant

oct05 outline tf budget

oct05 summary of

schedule budget

k743larp pheasant

fy06 budget

tf funding