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FONT Results 2010
Philip Burrows
Robert Apsimon, Doug Bett, Glenn Christian
Michael Davis, Colin Perry, Javier Resta Lopez
John Adams Institute
Oxford University
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FONT5 location
ATF2 extraction line
2
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FONT5 setup
QD10X QF11X QD12X QD14XQF13X QF15XK1 K2
P2 P3P1
To dump
FB board
DAQ
P2 K1 (‘position’)P3 K2 (‘angle’)P3 K1 P2 K23
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FONT5 digital FB board
Xilinx Virtex5 FPGA
9 ADC input channels (TI ADS5474)
4 DAC output channels (AD9744)
Clocked at 357 MHz phase-locked to beam
4x faster than FONT4
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Valencia FONT BPM movers
5
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Philip Burrows X-band 2010 Daresbury 2/12/106
BPM Improvements
• November/December 2010:
6 new BPM processors
10 BPM processors total:
x1, y1; x2, y2; x3,y3; DR x,y + 2 spare
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Philip Burrows X-band 2010 Daresbury 2/12/107
BPM Tests
• Tests of BPM processors:
basic signal checks
calibrations
resolution measurements
sensitivity to LO phase
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Philip Burrows X-band 2010 Daresbury 2/12/108
Calibration results: mover + corrector scans
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Philip Burrows X-band 2010 Daresbury 2/12/109
BPM sensitivity to LO phase
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Philip Burrows X-band 2010 Daresbury 2/12/1010
BPM work in progress
• Further matching of stripline – BPM cables
• Matching of sum – difference signal path lengths
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Philip Burrows X-band 2010 Daresbury 2/12/1011
Outline of FB results
• Latency
• Basic loop performance
• Banana correction
• Beam quality + kicker timing studies
• Coupled-loop FB results
• Next steps
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Latency: P2 K1 loop
Latency 133ns
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Latency estimate
• Time of flight kicker – BPM: 12ns• Signal return time BPM – kicker: 32ns
Irreducible latency: 44ns
• BPM processor: 10ns• ADC/DAC (4.5 357 MHz cycles) 14ns• Signal processing (8 357 MHz cycles) 22ns• FPGA i/o 3ns• Amplifier 35ns• Kicker fill time 3ns
Electronics latency: 87ns
• Total latency budget: 131ns
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P2 K1 loop performance
With banana correction
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P2 K1 loop performance
Incoming position scan
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P2 K1 loop jitter reduction
Bunch 1 Bunch 2
2.1 um 0.4 um
Factor of 5 jitter reduction
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Bunch 2 jitter vs. gain
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Bunch 1-2 correlations
Bunch 1
Bu
nch
2
Feedback removes bunch correlations
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Bunch 1-2 correlations vs. gain
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0.4 micron jitter propagation from P2
P2
Y [
mic
ron]
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Jitter at ATF2 IP
4
Cou
nts
Assuming perfect lattice, no further imperfections (!)
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P2 K1 loop jitter reduction
Bunch 1 Bunch 2 Bunch 3
2.1 um 0.4 um 0.8 um
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Bunch correlations
Bunch 1
Bu
nch
2
Bunch 2B
un
ch 3
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Summary so far
• These spectacular results were obtained with beam of exceptional quality:
Incoming train jitter: 2um
Bunch 1-2 correlations: 98%
Bunch 2-3 correlations: 80%
This is NOT typical!24
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P2 K1 loop jitter reduction(February 2010)
Bunch 1 Bunch 2 Bunch 3
13 um 5 um 3 um
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Coupled loop jitter reduction(December 2010)
Bunch 1 Bunch 2 Bunch 3
9.4 um 5.6 um 4.4 um
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Machine studies
• Have made some efforts to understand causes of poorer beam quality:
Damping ring configuration – inconclusive
Extraction kicker setup – more conclusive
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Extraction kicker pulse (1)
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Extraction kicker pulse (2)
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Extraction kicker pulse (3)
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Extraction kicker pulse (4)
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Kicker timing study
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x positions at P2 vs. timing
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y results at P2 vs. timing
• Banana B12 B23 Jitter (um)
(um) (%) (%) B1 B2 B3
1 140 0 89 14.6 3.6 3.8
2 88 58 95 6.1 4.5 4.6
3 65 44 88 5.5 4.2 3.9
4 15 59 51 5.3 4.0 11.0
5 83 80 55 4.7 5.1 20.0
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y positions at P2
1
5
Bunch 1
Bunch 2
Bunch 3
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Further Feedback Tests
• K1 – P2 loop
• K2 – P3 loop
• K1 – P2 + K2 – P3 uncoupled
• K1 – P2 + K2 – P3 coupled
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Philip Burrows X-band 2010 Daresbury 2/12/1037
K1 – P2 loop gain scan
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Philip Burrows X-band 2010 Daresbury 2/12/1038
K2 – P3 loop gain scan
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K1 – P2 + K2 – P3 coupled: K1 gain scan
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K1 – P2 + K2 – P3 coupled: K2 gain scan
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Possible Next Steps
• Beam quality: more systematic study of extraction kicker timing, bunch spacing …
• Run with just 2 bunches for optimal bunch-bunch correlations?
• Instrument downstream BPMs with FONT electronics to monitor downstream performance
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FB simulation: P2-K1+P3-K2 coupled
Bunch 1
Bunch 2
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Possible Next Steps
• Beam quality: more systematic study of extraction kicker timing, bunch spacing …
• Run with just 2 bunches for optimal bunch-bunch correlations?
• Instrument downstream BPMs with FONT electronics to monitor downstream performance
• IP FB – tomorrow’s talk• Tests with a long bunchtrain in the extraction
line?
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Multi-bunch studies
• Now that the FONT5 system is fully operational it would be highly desirable to test it with a LONG bunch train
• We have modified the DAQ and firmware for this purpose, but so far there has been no opportunity to test it
• We would be interested in trying FONT with the fast-extraction kicker and 20-30 bunches
• Very important for PhD theses of Robert Apsimon and Douglas Bett
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DR studies
• Instrumented BPM ‘LW26’ in ring with FONT BPM processors
• Wrote modified firmware + DAQ for DR:
monitor beam turn-by-turn• Debugged in parasitic running October-December• Issues with 2.16MHz clock• Record up to c. 40k turns of data:
either sequentially, or 1 in n turns
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DR x orbit bumps
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DR y orbit bumps
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DR y: 1 in n turns
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DR studies
• Instrumented BPM ‘LW26’ in ring with FONT BPM processors
• Wrote modified firmware + DAQ for DR:
monitor beam turn-by-turn• Debugged in parasitic running October-December• Issues with 2.16MHz clock• Record up to 30k turns of data:
either sequentially, or 1 in n turns• Correlate DR – extraction line measurements
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DR BPM
Last turn
time
FONT P1
extraction
Last 19 DR turns + extraction
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11:19 15:32 19:01 11:5700:38
36 hours of parasitic data!
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Correlations
DR∆x DR∆y DR Σ P1∆x P1∆y P1 Σ P2∆y P3∆y
DR∆x -0.97 0.60 0.27 0.34 -0.93 0.97 0.99
DR∆y -0.97 -0.62 -0.20 -0.24 0.90 -0.97 -0.98
DR Σ 0.60 -0.62 -0.22 -0.44 -0.30 0.74 0.54
P1∆x 0.27 -0.20 -0.22 0.58 -0.38 0.14 0.27
P1∆y 0.34 -0.24 -0.44 0.58 -0.58 0.15 0.38
P1 Σ -0.93 0.90 -0.30 -0.38 -0.58 -0.85 -0.96
P2∆y 0.97 -0.97 0.74 0.14 0.15 -0.85 0.96
P3∆y 0.99 -0.98 0.54 0.27 0.38 -0.96 0.96
PRELIMIN
ARY