Status & operational experience of Liberas at SSRF Leng Yongbin, Yan Yingbing, Zhou Weimin, Chen...
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Transcript of Status & operational experience of Liberas at SSRF Leng Yongbin, Yan Yingbing, Zhou Weimin, Chen...
Status & operational experience
of Liberas at SSRF
Leng Yongbin, Yan Yingbing, Zhou Weimin, Chen Yongzhong
Ye Kairong, Yuan Renxian, Zou Yi, Yu Luyang, Huang Guoqing
BI Group, SSRF2009-06-22
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Outline
Introduction of SSRFSSRF BPM systemLibera applications
• Tune monitor• Beam spectrum monitor• Beam current & charge measurement• BPM phase advance monitor
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Shanghai Synchrotron Radiation Facility
Third generation light source Total budget is about 130 millions EURO Started @ 12/25/2004 and is open to user @ 5/1/2009
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
SSRF complex
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Libera based BPM system
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Specification
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
BPM system overview
Components Solution Producer
Pickup Stripline @ injector
Button @ ring
Customer design, local company
Customer design, Kyocera, Japan
Cable Major cable, SMR400
Jumper cable, SMR240
Field fabricated, Times microwave
Prefabricated, Times microwave
Processor Libera electron IT
IOC software DLS package Diamond Light Source
Group access Soft IOC, EPICS DB chain
Customer design
High level application
Matlab, LCA
Soft IOC analyze package Customer design
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Ring pickup factory test
Mechanical inspection DC isolation resistance
Capacitance
Magnetic permeability
AC voltage break down
Network analyzer S11
Leakage
BPM block gauge
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Ring pickup factory test
Measurement Results
-2.5
-2
-1.5
-1
-0.5
0
0 5 10 15 20
Frequency [GHz]
Ret
urn
Lo
ss [
dB
]
Sample1_1Sample1_2Sample2_1Sample2_2Sample3_1Sample3_2Sample4_1Sample4_2Sample5_1Sample5_2Sample6_1Sample6_2Sample7_1Sample7_2Sample8_1Sample8_2Sample9_1Sample9_2Sample10_1Sample10_2Sample11_1Sample11_2
Step Response(~20GHz)
45
46
47
48
49
50
51
52
0.08 0.09 0.1 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19
Time[ns]
Oh
m
Sample 1_1Sample 1_2Sample 2_1Sample 2_2Sample 3_1Sample 3_2Sample 4_1Sample 4_2Sample 5_1Sample 5_2Sample 6_1Sample 6_2Sample 7_1Sample 7_2Sample 8_1Sample 8_2Sample 9_1Sample 9_2Sample 10_1Sample 10_2Sample 11_1Sample 11_2
系列23
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
BPM station 5
ID BPM
Blue line 30m, redundancy for installation 20m The longest cable should be shorter than 30m + 20m = 50mTotal insertion loss < 0.1 * 50 + 0.5 + 0.5 = 6dB
Major cableTIMES LMR400Loss < 10dB/100m
Jumper cableTIMES LMR240Total loss < 0.5dB
BPM cabling
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
BPM cable & processor installation
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
BPM data & functions ready for accelerator physicists
Support by DLS package• ADC raw data @ 117MHz, 2048 points• First turn data synchronized by injection trigger• First 2048 samples of TBT data synchronized by injection trigger• Up to 0.5M samples of TBT data on demand• 10Hz SA data, orbit measurement • Embedded position interlock logic• User defined current scaling factor (beam current measurement)
Instrumentation Technologies delivered • 10kHz FA data @ SFP port
SSRF added some applications• 24 hours buffer for SA data @ EPICS DB level• Auto Gain Control logic (1Hz) @ EPICS DB level• Beam lifetime measurement @ EPICS DB level• Phase advance measurement @ EPICS DB level
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Current performance
•No obvious critical narrow band noise below 100Hz•Integrated noise @ [0 1kHz] smaller than 1um•Could be improved by identify & remove unknown noise source
101
102
103
104
10510
-3
10-2
10-1
100
101
Frequency(Hz)
Am
plit
ud
e (
um
)
Integration noise @ 146mA, 2009.05.31
Electronics, 10BPM5Y plane, 15BPM8X plane, 15BPM8
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Ring BPM resolution
0 20 40 60 80 100 120 140 160 180 2000
0.2
0.4
0.6
0.8
1
Beam current (mA)
BP
M r
esol
utio
n (
m)
SSRF Ring BPMs resolution test @ 2009.03.31
Average of all 140 BPMs
0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.40
5
10
15
20
25
30
BPM resolution varation (m)
Cou
nts
SSRF Ring 140 BPMs rms noise histgram @ 0.2mA
0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.650
2
4
6
8
10
12
BPM resolution varation (m)
Cou
nts
SSRF Ring 140 BPMs rms noise histgram @ 0.9mA
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.80
2
4
6
8
10
12
14
BPM resolution varation (m)
Cou
nts
SSRF Ring 140 BPMs rms noise histgram @ 10.1mA
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
2
4
6
8
10
12
14
16
BPM resolution varation (m)
Cou
nts
SSRF Ring 140 BPMs rms noise histgram @ 199.5mA
0.2mA 1mA 10mA 200mA
COD resolution, BW 2Hz TBT resolution, BW 350kHz
0 20 40 60 80 100 120 1400
40
80
120
160
200
240
BPM index
BP
M r
eadi
ngs
ST
D (
nm)
@ 1
0Hz
Ring BPM resolution test @ 202mA top-up operation
10BPM3
10BPM1
08BPM3
14BPM7
16BPM5
10BPM5, electronics evaluaiton setup
2009.04.16
COD resolution @ topup operation
COD resolution: typical <200nm, best <80nm, with ideal beam <40nmTBT resolution: typical 3umUniformity of filling pattern is important for BPM performance
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Beam current dependency (1)
100 110 120 130 140 150 160 170 180 190 200 210-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
Beam current (mA)
BP
M r
eadi
ngs
drift
(m
m)
BPM current dependecy test during injection @ 2009.04.13
100 110 120 130 140 150 160 170 180 190 200 210-5
-4
-3
-2
-1
0
1
Beam current (mA)
BP
M r
eadi
gs d
rift (
m)
BPM beam current depedency test @ 2009.04.13
Evaluated BPM: 10BPM5
"ideal beam" signal from 1to4power splitter link to on button
Data acquired during injectionabout 15 minutes
Evaluated during injection (15minutes)
BPM readings drift including: electronics BCD&FPD, BPM block drift, orbit driftMore than 90% drift within 20um, few BPMs drift up to 70um @ [100mA 200mA]
Electronics BCD&FPD only: within 5um @ [100mA 200mA]
Reference BPMNormal BPMs
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Beam current dependency (2)
Evaluated during decay (2.5 hours)
BPM readings drift including: electronics BCD&FPD, BPM block drift, orbit driftMore than 90% drift within 10um, few BPMs drift up to 30um @ [170mA 200mA]
Electronics BCD&FPD only: within 1.5um @ [170mA 200mA]
170 175 180 185 190 195 200 205-30
-20
-10
0
10
20
30
40
Beam current (mA)
BP
M r
eadi
ngs
drift
(m
)
BPM current dependency test during decay @ 009.04.14
3 hours
170 175 180 185 190 195 200-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
Beam Current (mA)
BP
M r
eadi
ngs
drift
(m
)
BPM beam current dependency test @ 2009.04.14
Evaluated BPM: 10BPM5
"Ideal beam" signal from1to4 power splitter link toone button
Data acquired during decayabout 2.5 hours
Normal BPMs Reference BPM
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Filling pattern dependence (1)
0 2 4 6 8 10 12 14-0.35
-0.3
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
Time (minutes)
BP
M r
eadi
ngs
drift
(m
m)
BPM filling pattern test @ 10mA, 2009.04.30
2
4
8
16 32 48
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Filling pattern dependence (2)
0 50 100 150 200 250 3000
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Bunch ID
Bun
ch c
harg
e (n
C)
BPM Filling pattern test @ 2009.05.01
Topup refill
Original fill
0 20 40 60 80 100 120118.8
119
119.2
119.4
119.6
119.8
120
120.2
120.4
Time (minutes)
Bea
m c
urre
nt (
mA
)
BPM filling pattern dependence test @ 2009.05.01
0 20 40 60 80 100 120-12
-10
-8
-6
-4
-2
0
2
4
6
Time (minutes)
BP
M r
eadi
ngs
drift
(m
)
BPM filling pattern dependence test @ 2009.05.01
Y plane, 10BPM1X plane, 10BPM1
0 20 40 60 80 100 120-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
Time (minutes)
BP
M r
eadi
ngs
drift
(m
)
BPM filling pattern dependence test @ 2009.05.01
Y plane, 10BPM4X plane, 10BPM4
No evidence showed that BPM readings jumped due to filling pattern changing
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Filling pattern dependence (3)
No evidence showed that BPM readings jumped due to filling pattern changing
Original fill
refill
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Libera application
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Tune monitor configuration
Configuration is the same for Booster and Ring
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Tune monitor performance: Ring
Daily operation:FFT of 10k TBT data, uncertainty < E-4
Precise measurement: FFT of 400k TBT data, uncertainty < E-5
Typical TBT data during tune measurement
Precise tune measurement
Daily operation panel
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Tune monitor performance: Booster
TBT data 400k samples, cover 240msFFT windows size 2048, 1/1.23ms = 800HzTune measurement uncertainty < E-3
Horizontal ramping tune Vertical ramping tune Tune drift during ramping
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Beam spectrum monitor (TBT)
Current dependent few tens Hz noise @ copper cavity running. Gone with copper cavity
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Beam spectrum monitor (TBT)
Observed 15Hz & 46Hz noise, PS group targeted the source based on this information
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Beam spectrum monitor (10Hz)
0.1Hz, 3.1Hz and 4.5Hz noise observed, still working to identify the source
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Beam current & charge measurement
Libera could be used to measure beam current, data rate usually is better than PCT system. ButOrbit offset adjustment should be applied.RF frequency adjustment should be applied.Current scale factor (KI) and current offset should be precisely calibrated with PCT one by one. It’s easy to do when machine running with fixed orbit. If orbit moving it will be very complicated.
BI group SSRF, Feb 2008
Beam arrival monitor
Injected beam First turn
Multi turns Stored beam
Sum signal of first turn, calculated from ADC data Bad cable connection, or huge orbit offset
SSRF, Feb 2008
Beam current measurement @ ring
0 10 20 30 40 50 60 70 80 90 100
10-1
100
101
Beam current (mA)
Cur
rent
rea
ding
err
or (
muA
)
Libera current measurement test @ 2009.02.18
NPCT175 + 5.5 digits DVMSingle libera readingsAverage of 140 libera readings
0 50 100 150 200 250196.8
197
197.2
197.4
197.6
197.8
Time (s)
Bea
m c
urre
nt r
eadi
ngs
(mA
)
Libera current measurement @ RF variation, 2009.01.02
Libera readingsNPCT readings
All Liberas averageRF frequency changed from499.6725MHz to 499.6735MHzand back to 499.6725MHz
Current resolution test RF frequency dependence observed
Orbit dependence observed
Current resolution is better than PCT @ [0 50mA]
Current measurement error 0.2% due to RF change
Up to 2% current error due to orbit move
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
BPM Phase advance monitor
The phase difference between two neighboring BPMs can be calculated
Cell 1
YAN Yingbing / SSRF BI group Libera Workshop, ESRF, Jun 2009
Acknowledgment
Guenther Rehm and Micheal Abbott from DLS
Jean-Claude Denard from Soleil
Jim Sebek and Bob Hettel from SSRL, SLAC