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Digital Low-level RF Test at Diamond BoosterLLRF9 demo, March 16–20, 2015
D. Teytelman2, et. al.
2Dimtel, Inc., San Jose, CA, USA
April 15, 2015
(Dimtel) iGp12 DLS 1 / 16
Setup LLRF9 Introduction
Outline
1 SetupLLRF9 IntroductionDemo Setup and Schedule
2 System Operation
3 Performance Tests
(Dimtel) iGp12 DLS 2 / 16
Setup LLRF9 Introduction
LLRF9 System
A single 2U chassis for one-and two-cavity RF control;9 input RF channels, 2 RFoutputs;Tuner motor control viaRS-485/Ethernet/EPICS;External interlock daisy-chain;Two external trigger inputs;Eight opto-isolated basebandADC channels for slowinterlocks.
(Dimtel) iGp12 DLS 3 / 16
Setup LLRF9 Introduction
LLRF9 System
A single 2U chassis for one-and two-cavity RF control;9 input RF channels, 2 RFoutputs;Tuner motor control viaRS-485/Ethernet/EPICS;External interlock daisy-chain;Two external trigger inputs;Eight opto-isolated basebandADC channels for slowinterlocks.
(Dimtel) iGp12 DLS 3 / 16
Setup LLRF9 Introduction
LLRF9 System
A single 2U chassis for one-and two-cavity RF control;9 input RF channels, 2 RFoutputs;Tuner motor control viaRS-485/Ethernet/EPICS;External interlock daisy-chain;Two external trigger inputs;Eight opto-isolated basebandADC channels for slowinterlocks.
(Dimtel) iGp12 DLS 3 / 16
Setup LLRF9 Introduction
LLRF9 System
A single 2U chassis for one-and two-cavity RF control;9 input RF channels, 2 RFoutputs;Tuner motor control viaRS-485/Ethernet/EPICS;External interlock daisy-chain;Two external trigger inputs;Eight opto-isolated basebandADC channels for slowinterlocks.
(Dimtel) iGp12 DLS 3 / 16
Setup LLRF9 Introduction
LLRF9 System
A single 2U chassis for one-and two-cavity RF control;9 input RF channels, 2 RFoutputs;Tuner motor control viaRS-485/Ethernet/EPICS;External interlock daisy-chain;Two external trigger inputs;Eight opto-isolated basebandADC channels for slowinterlocks.
(Dimtel) iGp12 DLS 3 / 16
Setup LLRF9 Introduction
LLRF9 System
A single 2U chassis for one-and two-cavity RF control;9 input RF channels, 2 RFoutputs;Tuner motor control viaRS-485/Ethernet/EPICS;External interlock daisy-chain;Two external trigger inputs;Eight opto-isolated basebandADC channels for slowinterlocks.
(Dimtel) iGp12 DLS 3 / 16
Setup Demo Setup and Schedule
Outline
1 SetupLLRF9 IntroductionDemo Setup and Schedule
2 System Operation
3 Performance Tests
(Dimtel) iGp12 DLS 4 / 16
Setup Demo Setup and Schedule
Demo Setup
Set up LLRF9 to run the booster RF with the following signals:RF reference (500 MHz)Three cavity probe signals (500 MHz)Cavity forward signal (500 MHz)Cavity reflected signal (500 MHz)Drive output (500 MHz)Interlock input (TTL)Ramp trigger (TTL)
Used EPICS interface to control cavity tuning;LLRF9 drive was connected to RF Safety Crate (113S) to maintaininterlocks;Bypassed existing LLRF chain, RF Safety Crate output connecteddirectly to preamplifier (222S).
(Dimtel) iGp12 DLS 5 / 16
Setup Demo Setup and Schedule
Progress
MondayConnected LLRF9 to inputs only, established signal levels andtransferred calibrations;Connected drive output, configured feedback loops;Established closed-loop operation in CW mode.
TuesdayInterfaced LLRF9 tuner control loops to booster motor control;Established closed-loop operation of tuner and field balance loops.
WednesdayTransitioned to closed-loop operation with ramping and beam;Characterization of open and closed-loop spectra.
ThursdayStep response measurements;System set up from scratch by Alun Watkins.
FridayPerformance testing;Discussion.
(Dimtel) iGp12 DLS 6 / 16
System Operation
Open Loop Transfer Function
∑ ErrorFeedback
RFcavity
DisturbancesSetpoint and excitation
Cavity field probe
Measured from setpoint to thecavity probe;Feedback block in open loop hasno dynamics, just gain and phaseshift;Open loop cavity response;Fit resonator model to extractgain, loaded Q, detuning, delay,phase shift at ωrf;Faster than expected gain roll-offabove the resonance.
(Dimtel) iGp12 DLS 7 / 16
System Operation
Open Loop Transfer Function
∑ ErrorFeedback
RFcavity
DisturbancesSetpoint and excitation
Cavity field probe
Measured from setpoint to thecavity probe;Feedback block in open loop hasno dynamics, just gain and phaseshift;Open loop cavity response;Fit resonator model to extractgain, loaded Q, detuning, delay,phase shift at ωrf;Faster than expected gain roll-offabove the resonance.
(Dimtel) iGp12 DLS 7 / 16
System Operation
Open Loop Transfer Function
−250 −200 −150 −100 −50 0 50 100 150 200 250−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
−250 −200 −150 −100 −50 0 50 100 150 200 250−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
Measured from setpoint to thecavity probe;Feedback block in open loop hasno dynamics, just gain and phaseshift;Open loop cavity response;Fit resonator model to extractgain, loaded Q, detuning, delay,phase shift at ωrf;Faster than expected gain roll-offabove the resonance.
(Dimtel) iGp12 DLS 7 / 16
System Operation
Open Loop Transfer Function
−250 −200 −150 −100 −50 0 50 100 150 200 250−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
Gain = 0.2, Q = 15739.5, (wr − w
rf) = 0.55 kHz
Data
Fit
−250 −200 −150 −100 −50 0 50 100 150 200 250−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
τ = 750.834 ns, φ = 359.6 deg
Data
Fit
Measured from setpoint to thecavity probe;Feedback block in open loop hasno dynamics, just gain and phaseshift;Open loop cavity response;Fit resonator model to extractgain, loaded Q, detuning, delay,phase shift at ωrf;Faster than expected gain roll-offabove the resonance.
(Dimtel) iGp12 DLS 7 / 16
System Operation
Open Loop Transfer Function
−250 −200 −150 −100 −50 0 50 100 150 200 250−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
Gain = 0.2, Q = 15739.5, (wr − w
rf) = 0.55 kHz
Data
Fit
−250 −200 −150 −100 −50 0 50 100 150 200 250−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
τ = 750.834 ns, φ = 359.6 deg
Data
Fit
Measured from setpoint to thecavity probe;Feedback block in open loop hasno dynamics, just gain and phaseshift;Open loop cavity response;Fit resonator model to extractgain, loaded Q, detuning, delay,phase shift at ωrf;Faster than expected gain roll-offabove the resonance.
(Dimtel) iGp12 DLS 7 / 16
System Operation
Wideband Open Loop Transfer Function
−4000 −3000 −2000 −1000 0 1000 2000 3000 4000−80
−60
−40
−20
0
Frequency offset (kHz)
Gain
(dB
)
−4000 −3000 −2000 −1000 0 1000 2000 3000 4000−600
−400
−200
0
200
400
Frequency offset (kHz)
Phase (
degre
es)
Wider sweep reveals a parasiticmode at 2.8 MHz above the πmode;Negative feedback for the π modeis positive for the parasitic mode;This positive feedback limits directloop gain;The simplest way around theissue is to use digital delay toequalize the modal phase shifts(230 ns).
(Dimtel) iGp12 DLS 8 / 16
System Operation
Wideband Open Loop Transfer Function
−400 −200 0 200 400−50
−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
Gain −13.7 dB
−400 −200 0 200 400−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
Phase −0.4 deg
2600 2800 3000 3200−35
−30
−25
−20
−15
−10
Frequency offset (kHz)
Gain
(dB
)
Gain −12.6 dB
2600 2800 3000 3200−300
−200
−100
0
100
Frequency offset (kHz)
Phase (
degre
es)
Phase −121.0 deg
Wider sweep reveals a parasiticmode at 2.8 MHz above the πmode;Negative feedback for the π modeis positive for the parasitic mode;This positive feedback limits directloop gain;The simplest way around theissue is to use digital delay toequalize the modal phase shifts(230 ns).
(Dimtel) iGp12 DLS 8 / 16
System Operation
Wideband Open Loop Transfer Function
−400 −200 0 200 400−50
−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
Gain −13.7 dB
−400 −200 0 200 400−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
Phase −0.4 deg
2600 2800 3000 3200−35
−30
−25
−20
−15
−10
Frequency offset (kHz)
Gain
(dB
)
Gain −12.6 dB
2600 2800 3000 3200−300
−200
−100
0
100
Frequency offset (kHz)
Phase (
degre
es)
Phase −121.0 deg
Wider sweep reveals a parasiticmode at 2.8 MHz above the πmode;Negative feedback for the π modeis positive for the parasitic mode;This positive feedback limits directloop gain;The simplest way around theissue is to use digital delay toequalize the modal phase shifts(230 ns).
(Dimtel) iGp12 DLS 8 / 16
System Operation
Wideband Open Loop Transfer Function
−400 −200 0 200 400−50
−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
Gain −13.7 dB
−400 −200 0 200 400−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
Phase −0.4 deg
2600 2800 3000 3200−35
−30
−25
−20
−15
−10
Frequency offset (kHz)
Gain
(dB
)
Gain −12.6 dB
2600 2800 3000 3200−200
−100
0
100
200
Frequency offset (kHz)
Phase (
degre
es)
Phase −2.5 deg
Wider sweep reveals a parasiticmode at 2.8 MHz above the πmode;Negative feedback for the π modeis positive for the parasitic mode;This positive feedback limits directloop gain;The simplest way around theissue is to use digital delay toequalize the modal phase shifts(230 ns).
(Dimtel) iGp12 DLS 8 / 16
System Operation
Proportional Loop Gain and Delay
−1000 −500 0 500 1000 1500 2000 2500 3000 3500 4000−80
−70
−60
−50
−40
−30
−20
−10
Frequency offset (kHz)
Gain
(dB
)
Gain margin 12.3 dB at 2874.4 kHz
−1000 −500 0 500 1000 1500 2000 2500 3000 3500 4000−200
−150
−100
−50
0
50
100
150
200
Frequency offset (kHz)
Gain
(dB
)
TF
GM
TF
GM
Set up minimum delay and equalizedtransfer functions for identical 3 dBclosed-loop peaking.
Minimum delay: peak gain at RF is−9.2 dB, gain margin 12.3 dBEqualized: peak gain at RF is+8 dB, gain margin 11.8 dB, phasemargin 88 degrees
More sophisticated parasitic modesuppression methods can improvethe performance only slightly, around2-3 dB.
(Dimtel) iGp12 DLS 9 / 16
System Operation
Proportional Loop Gain and Delay
−1000 −500 0 500 1000 1500 2000 2500 3000 3500 4000−60
−50
−40
−30
−20
−10
0
10
Frequency offset (kHz)
Gain
(dB
)
Gain margin 11.8 dB at 3105.9 kHz
−1000 −500 0 500 1000 1500 2000 2500 3000 3500 4000−200
−150
−100
−50
0
50
100
150
200Phase margin 88.5
° at 2904.3 kHz
Frequency offset (kHz)
Gain
(dB
)
TF
GM
PM
TF
GM
PM
Set up minimum delay and equalizedtransfer functions for identical 3 dBclosed-loop peaking.
Minimum delay: peak gain at RF is−9.2 dB, gain margin 12.3 dBEqualized: peak gain at RF is+8 dB, gain margin 11.8 dB, phasemargin 88 degrees
More sophisticated parasitic modesuppression methods can improvethe performance only slightly, around2-3 dB.
(Dimtel) iGp12 DLS 9 / 16
System Operation
Proportional Loop Gain and Delay
−1000 −500 0 500 1000 1500 2000 2500 3000 3500 4000−60
−50
−40
−30
−20
−10
0
10
Frequency offset (kHz)
Gain
(dB
)
Gain margin 11.8 dB at 3105.9 kHz
−1000 −500 0 500 1000 1500 2000 2500 3000 3500 4000−200
−150
−100
−50
0
50
100
150
200Phase margin 88.5
° at 2904.3 kHz
Frequency offset (kHz)
Gain
(dB
)
TF
GM
PM
TF
GM
PM
Set up minimum delay and equalizedtransfer functions for identical 3 dBclosed-loop peaking.
Minimum delay: peak gain at RF is−9.2 dB, gain margin 12.3 dBEqualized: peak gain at RF is+8 dB, gain margin 11.8 dB, phasemargin 88 degrees
More sophisticated parasitic modesuppression methods can improvethe performance only slightly, around2-3 dB.
(Dimtel) iGp12 DLS 9 / 16
System Operation
Closed Loop Transfer Function
∑ ErrorFeedback
RFcavity
DisturbancesSetpoint and excitation
Cavity field probe
Measured from setpoint to theerror signal;Quantifies closed-loopdisturbance rejection vs.frequency offset from fRF;Proportional and integrator loopsproduce high rejection at lowfrequencies;Magnitude on log-log scale, fieldsetpoint of 1 MV.
(Dimtel) iGp12 DLS 10 / 16
System Operation
Closed Loop Transfer Function
∑ ErrorFeedback
RFcavity
DisturbancesSetpoint and excitation
Cavity field probe
Measured from setpoint to theerror signal;Quantifies closed-loopdisturbance rejection vs.frequency offset from fRF;Proportional and integrator loopsproduce high rejection at lowfrequencies;Magnitude on log-log scale, fieldsetpoint of 1 MV.
(Dimtel) iGp12 DLS 10 / 16
System Operation
Closed Loop Transfer Function
101
102
103
104
105
−70
−60
−50
−40
−30
−20
−10
0
10
Frequency offset (Hz)
Att
en
ua
tio
n (
dB
)
Direct
Direct+integral
Measured from setpoint to theerror signal;Quantifies closed-loopdisturbance rejection vs.frequency offset from fRF;Proportional and integrator loopsproduce high rejection at lowfrequencies;Magnitude on log-log scale, fieldsetpoint of 1 MV.
(Dimtel) iGp12 DLS 10 / 16
System Operation
Closed Loop Transfer Function
101
102
103
104
105
−70
−60
−50
−40
−30
−20
−10
0
10
Frequency offset (Hz)
Att
en
ua
tio
n (
dB
)
Direct
Direct+integral
Measured from setpoint to theerror signal;Quantifies closed-loopdisturbance rejection vs.frequency offset from fRF;Proportional and integrator loopsproduce high rejection at lowfrequencies;Magnitude on log-log scale, fieldsetpoint of 1 MV.
(Dimtel) iGp12 DLS 10 / 16
System Operation
Step Response
0 50 100 150 200 250190
200
210
220
230
Time (µs)
Am
plit
ud
e (
kV
)
Cavity probe
0 50 100 150 200 25054
54.5
55
55.5
56
Ph
ase
(d
eg
) Use ramp start signal to triggerwaveform acquisition;Ramp profile loaded with a 10%amplitude step (200 to 220 kV);Some coupling between amplitude andphase;All input channels are captured on thesame trigger, observing reflectedpower here;Characterized a 5 degree phase stepas well.
(Dimtel) iGp12 DLS 11 / 16
System Operation
Step Response
0 50 100 150 200 250190
200
210
220
230
Time (µs)
Am
plit
ud
e (
kV
)
Cavity probe
0 50 100 150 200 25054
54.5
55
55.5
56
Ph
ase
(d
eg
) Use ramp start signal to triggerwaveform acquisition;Ramp profile loaded with a 10%amplitude step (200 to 220 kV);Some coupling between amplitude andphase;All input channels are captured on thesame trigger, observing reflectedpower here;Characterized a 5 degree phase stepas well.
(Dimtel) iGp12 DLS 11 / 16
System Operation
Step Response
0 50 100 150 200 250190
200
210
220
230
Time (µs)
Am
plit
ud
e (
kV
)
Cavity probe
0 50 100 150 200 25054
54.5
55
55.5
56
Ph
ase
(d
eg
) Use ramp start signal to triggerwaveform acquisition;Ramp profile loaded with a 10%amplitude step (200 to 220 kV);Some coupling between amplitude andphase;All input channels are captured on thesame trigger, observing reflectedpower here;Characterized a 5 degree phase stepas well.
(Dimtel) iGp12 DLS 11 / 16
System Operation
Step Response
0 10 20 30 40 50190
200
210
220
230
Time (µs)
Am
plit
ud
e (
kV
)
Cavity probe
0 10 20 30 40 500
0.5
1
Time (µs)
Am
plit
ud
e (
kW
)
Reflected power
0 10 20 30 40 5054
54.5
55
55.5
56
Ph
ase
(d
eg
)
0 10 20 30 40 50−100
−50
0
Ph
ase
(d
eg
)
Use ramp start signal to triggerwaveform acquisition;Ramp profile loaded with a 10%amplitude step (200 to 220 kV);Some coupling between amplitude andphase;All input channels are captured on thesame trigger, observing reflectedpower here;Characterized a 5 degree phase stepas well.
(Dimtel) iGp12 DLS 11 / 16
System Operation
Step Response
0 50 100 150 200 250198
200
202
204
Time (µs)
Am
plit
ud
e (
kV
)
0 50 100 150 200 25050
55
60
65
Ph
ase
(d
eg
) Use ramp start signal to triggerwaveform acquisition;Ramp profile loaded with a 10%amplitude step (200 to 220 kV);Some coupling between amplitude andphase;All input channels are captured on thesame trigger, observing reflectedpower here;Characterized a 5 degree phase stepas well.
(Dimtel) iGp12 DLS 11 / 16
Performance Tests
IQ Circles
20
40
60
80
30
210
60
240
90
270
120
300
150
330
180 0
Frequency offset input, IQ circles, decibel radius scale
Input signal at −60 to 0 dBm in 10 dBsteps, ≈ 1 Hz offset;Log scale polar plot (r = 20 log10|x|);Center offset, more prominent at lowamplitudes, is due to RF feedthrough(coupled from the reference channel);Can numerically remove the offsets;Good linearity (uncorrected forsynthesizer errors), consistent offsetsat −73 dBFS.
(Dimtel) iGp12 DLS 12 / 16
Performance Tests
IQ Circles
20
40
60
80
30
210
60
240
90
270
120
300
150
330
180 0
Frequency offset input, IQ circles, decibel radius scale
Input signal at −60 to 0 dBm in 10 dBsteps, ≈ 1 Hz offset;Log scale polar plot (r = 20 log10|x|);Center offset, more prominent at lowamplitudes, is due to RF feedthrough(coupled from the reference channel);Can numerically remove the offsets;Good linearity (uncorrected forsynthesizer errors), consistent offsetsat −73 dBFS.
(Dimtel) iGp12 DLS 12 / 16
Performance Tests
IQ Circles
20
40
60
80
30
210
60
240
90
270
120
300
150
330
180 0
Frequency offset input, IQ circles, decibel radius scale
Input signal at −60 to 0 dBm in 10 dBsteps, ≈ 1 Hz offset;Log scale polar plot (r = 20 log10|x|);Center offset, more prominent at lowamplitudes, is due to RF feedthrough(coupled from the reference channel);Can numerically remove the offsets;Good linearity (uncorrected forsynthesizer errors), consistent offsetsat −73 dBFS.
(Dimtel) iGp12 DLS 12 / 16
Performance Tests
IQ Circles
20
40
60
80
30
210
60
240
90
270
120
300
150
330
180 0
Frequency offset input, IQ circles, decibel radius scale
Input signal at −60 to 0 dBm in 10 dBsteps, ≈ 1 Hz offset;Log scale polar plot (r = 20 log10|x|);Center offset, more prominent at lowamplitudes, is due to RF feedthrough(coupled from the reference channel);Can numerically remove the offsets;Good linearity (uncorrected forsynthesizer errors), consistent offsetsat −73 dBFS.
(Dimtel) iGp12 DLS 12 / 16
Performance Tests
IQ Circles
−60 −50 −40 −30 −20 −10 0−80
−60
−40
−20
0
Input power (dBm)
(dB
FS
)
IQ amplitude vs. input power
−60 −50 −40 −30 −20 −10 0−0.2
0
0.2
0.4
0.6
Input power (dBm)
(dB
)
Error between Pin
and IQ amplitude, linear fit from −50 to −10
−60 −50 −40 −30 −20 −10 0
0.8
1
1.2
1.4
1.6
Input power (dBm)
(AD
C c
ou
nts
)
RF reference feedthrough (circle offset)
I
Q
Input signal at −60 to 0 dBm in 10 dBsteps, ≈ 1 Hz offset;Log scale polar plot (r = 20 log10|x|);Center offset, more prominent at lowamplitudes, is due to RF feedthrough(coupled from the reference channel);Can numerically remove the offsets;Good linearity (uncorrected forsynthesizer errors), consistent offsetsat −73 dBFS.
(Dimtel) iGp12 DLS 12 / 16
Performance Tests
IQ Circles: On the Bench
20
40
60
80
30
210
60
240
90
270
120
300
150
330
180 0
Frequency offset input, IQ circles, decibel radius scale
Similar to the test at DLS with severalmodifications:
Reference level at +10.5 dBm vs.+8 dBm at DLS;Input power level monitored by aspectrum analyzer;5 dB steps.
Center offset correction;Linearity good to ±0.05 dB down to-50 dBFS;Offsets/feedthrough at −72 dBFS.
(Dimtel) iGp12 DLS 13 / 16
Performance Tests
IQ Circles: On the Bench
20
40
60
80
30
210
60
240
90
270
120
300
150
330
180 0
Frequency offset input, IQ circles, decibel radius scale
Similar to the test at DLS with severalmodifications:
Reference level at +10.5 dBm vs.+8 dBm at DLS;Input power level monitored by aspectrum analyzer;5 dB steps.
Center offset correction;Linearity good to ±0.05 dB down to-50 dBFS;Offsets/feedthrough at −72 dBFS.
(Dimtel) iGp12 DLS 13 / 16
Performance Tests
IQ Circles: On the Bench
−70 −60 −50 −40 −30 −20 −10 0−80
−60
−40
−20
0
Input power (dBm)
(dB
FS
)
IQ amplitude vs. input power
−70 −60 −50 −40 −30 −20 −10 0−0.5
0
0.5
1
Input power (dBm)
(dB
)
Error between Pin
and IQ amplitude, linear fit
−70 −60 −50 −40 −30 −20 −10 00
0.5
1
1.5
2
2.5
Input power (dBm)
(AD
C c
ounts
)
RF reference feedthrough (circle offset)
I
Q
Similar to the test at DLS with severalmodifications:
Reference level at +10.5 dBm vs.+8 dBm at DLS;Input power level monitored by aspectrum analyzer;5 dB steps.
Center offset correction;Linearity good to ±0.05 dB down to-50 dBFS;Offsets/feedthrough at −72 dBFS.
(Dimtel) iGp12 DLS 13 / 16
Performance Tests
IQ Circles: On the Bench
−70 −60 −50 −40 −30 −20 −10 0−80
−60
−40
−20
0
Input power (dBm)
(dB
FS
)
IQ amplitude vs. input power
−70 −60 −50 −40 −30 −20 −10 0−0.5
0
0.5
1
Input power (dBm)
(dB
)
Error between Pin
and IQ amplitude, linear fit
−70 −60 −50 −40 −30 −20 −10 00
0.5
1
1.5
2
2.5
Input power (dBm)
(AD
C c
ounts
)
RF reference feedthrough (circle offset)
I
Q
Similar to the test at DLS with severalmodifications:
Reference level at +10.5 dBm vs.+8 dBm at DLS;Input power level monitored by aspectrum analyzer;5 dB steps.
Center offset correction;Linearity good to ±0.05 dB down to-50 dBFS;Offsets/feedthrough at −72 dBFS.
(Dimtel) iGp12 DLS 13 / 16
Performance Tests
Single Channel Phase Noise
103
104
105
106
107
−146
−144
−142
−140
−138
−136
−134
−132
Frequency (Hz)
dB
c/H
z
Reference channel at DLS,+8 dBm input level;Sources of lines at 65.2and 111.8 kHz are known,already fixed;Same channel measuredon the bench, HP8664A at+11.5 dBm.
(Dimtel) iGp12 DLS 14 / 16
Performance Tests
Single Channel Phase Noise
103
104
105
106
107
−146
−144
−142
−140
−138
−136
−134
−132
Frequency (Hz)
dB
c/H
z
Reference channel at DLS,+8 dBm input level;Sources of lines at 65.2and 111.8 kHz are known,already fixed;Same channel measuredon the bench, HP8664A at+11.5 dBm.
(Dimtel) iGp12 DLS 14 / 16
Performance Tests
Single Channel Phase Noise
103
104
105
106
107
−146
−144
−142
−140
−138
−136
−134
−132
X: 5.592e+04Y: −134
Frequency (Hz)
dB
c/H
z
DLS
Bench
Reference channel at DLS,+8 dBm input level;Sources of lines at 65.2and 111.8 kHz are known,already fixed;Same channel measuredon the bench, HP8664A at+11.5 dBm.
(Dimtel) iGp12 DLS 14 / 16
Performance Tests
Thermal Stability
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Ambient temperature measurement
On chassis
In air
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Out of loop sensors
−12 −10 −8 −6 −4 −2 020.98
20.99
21
21.01
21.02
21.03
21.04
Time (hours)
°C
In−loop sensors
LLRF:BRD1:NTC1:TEMP [degC]
LLRF:BRD2:NTC1:TEMP [degC]
LLRF:BRD3:NTC1:TEMP [degC]
LLRF:BRD1:DS1822:TEMP [degC]
LLRF:BRD2:DS1822:TEMP [degC]
LLRF:BRD1:NTC0:TEMP [degC]
LLRF:BRD2:NTC0:TEMP [degC]
LLRF:BRD3:NTC0:TEMP [degC]
9 internal sensors on cold plate: 6NTCs, 3 DS18B20 digital sensors;Three temperature stabilization loopsusing thermoelectric coolers;Two external sensors, in air andattached to chassis;Tight stabilization of in-loop sensors;Residual sensitivity of out-of-loopsensors is 0.09–0.12 ◦C/◦C.
(Dimtel) iGp12 DLS 15 / 16
Performance Tests
Thermal Stability
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Ambient temperature measurement
On chassis
In air
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Out of loop sensors
−12 −10 −8 −6 −4 −2 020.98
20.99
21
21.01
21.02
21.03
21.04
Time (hours)
°C
In−loop sensors
LLRF:BRD1:NTC1:TEMP [degC]
LLRF:BRD2:NTC1:TEMP [degC]
LLRF:BRD3:NTC1:TEMP [degC]
LLRF:BRD1:DS1822:TEMP [degC]
LLRF:BRD2:DS1822:TEMP [degC]
LLRF:BRD1:NTC0:TEMP [degC]
LLRF:BRD2:NTC0:TEMP [degC]
LLRF:BRD3:NTC0:TEMP [degC]
9 internal sensors on cold plate: 6NTCs, 3 DS18B20 digital sensors;Three temperature stabilization loopsusing thermoelectric coolers;Two external sensors, in air andattached to chassis;Tight stabilization of in-loop sensors;Residual sensitivity of out-of-loopsensors is 0.09–0.12 ◦C/◦C.
(Dimtel) iGp12 DLS 15 / 16
Performance Tests
Thermal Stability
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Ambient temperature measurement
On chassis
In air
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Out of loop sensors
−12 −10 −8 −6 −4 −2 020.98
20.99
21
21.01
21.02
21.03
21.04
Time (hours)
°C
In−loop sensors
LLRF:BRD1:NTC1:TEMP [degC]
LLRF:BRD2:NTC1:TEMP [degC]
LLRF:BRD3:NTC1:TEMP [degC]
LLRF:BRD1:DS1822:TEMP [degC]
LLRF:BRD2:DS1822:TEMP [degC]
LLRF:BRD1:NTC0:TEMP [degC]
LLRF:BRD2:NTC0:TEMP [degC]
LLRF:BRD3:NTC0:TEMP [degC]
9 internal sensors on cold plate: 6NTCs, 3 DS18B20 digital sensors;Three temperature stabilization loopsusing thermoelectric coolers;Two external sensors, in air andattached to chassis;Tight stabilization of in-loop sensors;Residual sensitivity of out-of-loopsensors is 0.09–0.12 ◦C/◦C.
(Dimtel) iGp12 DLS 15 / 16
Performance Tests
Thermal Stability
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Ambient temperature measurement
On chassis
In air
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Out of loop sensors
−12 −10 −8 −6 −4 −2 020.98
20.99
21
21.01
21.02
21.03
21.04
Time (hours)
°C
In−loop sensors (32 sample average)
LLRF:BRD1:NTC0:TEMP [degC]
LLRF:BRD2:NTC0:TEMP [degC]
LLRF:BRD3:NTC0:TEMP [degC]
LLRF:BRD1:NTC1:TEMP [degC]
LLRF:BRD2:NTC1:TEMP [degC]
LLRF:BRD3:NTC1:TEMP [degC]
LLRF:BRD1:DS1822:TEMP [degC]
LLRF:BRD2:DS1822:TEMP [degC]
9 internal sensors on cold plate: 6NTCs, 3 DS18B20 digital sensors;Three temperature stabilization loopsusing thermoelectric coolers;Two external sensors, in air andattached to chassis;Tight stabilization of in-loop sensors;Residual sensitivity of out-of-loopsensors is 0.09–0.12 ◦C/◦C.
(Dimtel) iGp12 DLS 15 / 16
Performance Tests
Thermal Stability
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Ambient temperature measurement
On chassis
In air
−12 −10 −8 −6 −4 −2 0
22
23
24
25
26
Time (hours)
°C
Out of loop sensors
−12 −10 −8 −6 −4 −2 020.98
20.99
21
21.01
21.02
21.03
21.04
Time (hours)
°C
In−loop sensors (32 sample average)
LLRF:BRD1:NTC0:TEMP [degC]
LLRF:BRD2:NTC0:TEMP [degC]
LLRF:BRD3:NTC0:TEMP [degC]
LLRF:BRD1:NTC1:TEMP [degC]
LLRF:BRD2:NTC1:TEMP [degC]
LLRF:BRD3:NTC1:TEMP [degC]
LLRF:BRD1:DS1822:TEMP [degC]
LLRF:BRD2:DS1822:TEMP [degC]
9 internal sensors on cold plate: 6NTCs, 3 DS18B20 digital sensors;Three temperature stabilization loopsusing thermoelectric coolers;Two external sensors, in air andattached to chassis;Tight stabilization of in-loop sensors;Residual sensitivity of out-of-loopsensors is 0.09–0.12 ◦C/◦C.
(Dimtel) iGp12 DLS 15 / 16
Summary
Summary
Successfully operated booster RF station with beam;Demonstrated powerful user interface tools necessary for faststation configuration;Demonstrated field control at forward power 60 W to 60 kW;Showed high rejection of disturbances, good tuner loop responsewith low reflected power.
(Dimtel) iGp12 DLS 16 / 16
Summary
Summary
Successfully operated booster RF station with beam;Demonstrated powerful user interface tools necessary for faststation configuration;Demonstrated field control at forward power 60 W to 60 kW;Showed high rejection of disturbances, good tuner loop responsewith low reflected power.
(Dimtel) iGp12 DLS 16 / 16
Summary
Summary
Successfully operated booster RF station with beam;Demonstrated powerful user interface tools necessary for faststation configuration;Demonstrated field control at forward power 60 W to 60 kW;Showed high rejection of disturbances, good tuner loop responsewith low reflected power.
(Dimtel) iGp12 DLS 16 / 16
Summary
Summary
Successfully operated booster RF station with beam;Demonstrated powerful user interface tools necessary for faststation configuration;Demonstrated field control at forward power 60 W to 60 kW;Showed high rejection of disturbances, good tuner loop responsewith low reflected power.
(Dimtel) iGp12 DLS 16 / 16
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