results of resolution study for the low-q ip-bpm(jan...
TRANSCRIPT
RESULTS OF RESOLUTION
STUDY FOR THE LOW-Q
IP-BPM(JAN 2011)
KNU with Honda san
Experimental scheme
Cable connection
oscillo
scope
Inside tunnelOutside tunnel
Pulse
Motor
bea
m
714 M
Hz
KEK X
KEK Y
KEK LO
KNU X
KNU Y
KNU REF
MOVER
Mover
controller
Mover
remote
system
ADC
KNU
KEK
1st
mo
du
le
KEK
2n
d m
odu
leK
NU
mo
du
le
KEK
KEK
Install & Align
All BPMs installed and aligned in the tunnel.
However, we can’t install Ref. cavity for KEK BPMs.
Test schedule
Calibration run with oscilloscope
Tue (01/25) Thu (01/27) Fri (01/28)
Shift time 09:00~17:00 01:00~09:00 01:00~09:00
Test list
Calibration &
Resolution run
with
oscilloscope
Calibration &
Resolution run
with
oscilloscope
& ADC
Calibration &
Resolution run
with ADC
Detail list
Experimental
Set-up test
& simple
calibration
KNU, KEK
BPMs
Calibration &
Resolution test
with OS
ADC check
KNU, KEK
BPMs
Calibration &
Resolution test
with ADC
Method for resolution study
Oscilloscope method for resolution study
Calibration run
KNU electronics set-up: 40dB_Amp
KEK electronics set-up: with out Att
I-Q tuning for KEK BPM1,2 & KNU BPM
Search for each BPMs center (BPM1->BPM2->KNU)
Calibration run for each BPMs
Resolution run
All the BPMs are set to have an offset.
Oscilloscope method for resolution study
KNU electronics set-up: 40dB_Amp
20dB RF Amp + 20 dB IF Amp
KNU electronics version1
Amp
20dB RF Amp
(0~7GHz)
RF
RF(50 ohm
terminate)
Amp
20dB IF Amp
(0~1GHz)
IF
IF Detector
LO
KNU Y signal
Amp
KNU REF signal
10dB LO Amp
with 6dB Att.
(0~7GHz)
I signal
Q signal REF signal
Oscilloscope method for resolution study
KEK electronics set-up: with out Att.
71
4
MH
z
KEK
1st
module
KEK
2n
d m
odule
1st module
2nd module
Oscilloscope method for resolution study
I-Q tuning for KEK BPM1,2 & KNU BPM
I-Q tuning was performed by using oscilloscope.
When I signal shows
the maximum position,
Q signal was set to
minimum position by
using phase shifter.
BPM calibration by using mover
0.922 V/um
0.674 V/um
KEK IP-BPM
KNU IP-BPM
Position resolution of low-Q BPM
Measured Position vs. Residual position
Position resolution of low-Q BPM
nm 70.44factorn Calibratio
Residual
charge valueNominal
chargeBeamfactorlGeometricaResolution
70 nm region
Position resolution of low-Q BPM
Compare results of Low-Q & High-Q IP-BPM
Low-Q High-Q High-Q
Experimental
equipmentsOscilloscope(11bit) ADC(14bit) ADC(14bit)
Normalized
resolution
(1010e/bunch)
70.45nm
with 3ch
Y1I, Y2I, Y_REF
5.94nm
with 10 ch
Y1I~X_REF
19.7nm
with 3ch
Y1I, Y2I, Y_REF
Method for resolution study
ADC method for resolution study
Calibration run
I-Q tuning for KEK BPM1,2 & KNU BPM
Search for each BPMs center (BPM1->BPM2->KNU)
Calibration run of KEK BPMs was performed under 40 dB,
30 dB, 20 dB attenuation cases.
Calibration run of KNU BPM was performed under 40 dB,
20 dB, 0 dB amplification cases.
Resolution run
Resolution run was performed for noise level.
BPM calibration by using ADC
Att [dB]KEK IP-BPM1
[counts/um]
KEK IP-BPM2
[counts/um]
20 88.08 174.00
30 40.81 102.66
40 9.80 2.59
Amp [dB]KNU IP-BPM
[counts/um]
40 134.93
20 27.75
0 1.39
KNU electronics
noise condition :
Amp [dB] with
ADC
KNU IP-BPM
resolution limit
for this test
20dB IF 40nm
BPM calibration by using ADC
Expected value of KNU IP-BPM
Amp [dB]KNU IP-BPM
[counts/um]
60 ~570
40 134.93
20 27.75
0 1.39
Further works
KNU electronics repair
Phase shifter
LO & RF signal isolation
Version 2 KNU electronics modify & fabrication
Change experimental scheme
Preparation of ADC module
KNU & KEK BPMs sensitivity study
KEK electronics sensitivity study (between 07&06 module)
KNU electronics repair
Phase shifter
Phase shifter was broken every
time. Also, we need remote system
of the phase shifter. Therefore,
phase shifter will make
independently with electronics.
LO & RF signal isolation
IF signal of KNU electronics shows
the mixed signal of LO and RF.
Also, KNU electronics work without RF signal.
Therefore, KNU electronics should repair to achieve more high resolution.
BPF
Limiter DAPhase
shifter
Power
divider Detector
LPF
LPF
Hybrid
Coupler
BPFRing
CouplerMixer
LNA DA
LNA DA
LO
IF(I)RF
RF IF(Q)
Detection
Voltage
10 dBm
-3 dB
7 dBm-3 dB
4 dBm
-1 dB
3 dBm-3 dB
0 dBm
10 dB
10 dBm 10 dBm
-30 dBm26 dB
-4 dBm0 dB
-4 dBm
-3 dB
-7 dBm
-3 dB
-10 dBm
-8 dB
-18 dBm-3 dB
-21 dBm -21 dBm
26 dB
-4 dBm
Version 2 KNU electronics modify
& fabrication
Needs for KNU electronics Ver. 2
Independent phase shifter & remote system
Remote system for variable attenuator of KNU electronics
Off-set control system for the IF signal
Fabrication of the KNU electronics Ver. 2
X-port of Ver. 2 electronics can make until June. However,
we need more study for the Y-port of KNU electronics Ver. 1.
Therefore, Y-port of Ver. 2 electronics don’t need until next
resolution study.
Needs for KNU electronics Ver. 2
Independent phase shifter
or remote system
Remote system for variable
attenuator of KNU electronics
Off-set control system
for the IF signal
Change experimental scheme
Cable connection
oscillo
scope
Inside tunnelOutside tunnel
bea
m
714 M
Hz
KEK X
KEK Y
KEK LO
KNU X
KNU Y
KNU REF
MOVER
Attenuator
ADC
KNU
KEK
1st
mo
du
le
KEK
2n
d m
odu
le
KEK
Att
Att
remote
KEK
Pulse
Motor
Mover
controller
Mover
remote
system
KN
U
mo
du
le
Preparation of ADC module
We should prepare ADC module to achieve more
high resolution for KNU electronics Ver. 1 and to
provide real time beam position to FONT.
What is preparation about ADC for next study?
Understanding that how ADC works
Operation voltage, offset, gate time, etc.
Real time ADC system
Real time beam position and waveform
Preparation of ADC module
ADC counts due to offset current (gate time: 62ns)
The other studies for the next test
KNU & KEK BPMs sensitivity study w/o electronics
Position sensitivity of each BPMs study
KEK electronics sensitivity study (between 07&06 module)
We should check KEK electronics sensitivity of 07 and 06 module.
What we need?
Amplifiers, attenuators, beam pipe, mover, etc.
Real time beam position
Example of the real time beam position
(oscilloscope)
Electronics design
KNU electronics version 1
그림 4. 프로토 타입의 Low-Q IP-BPM y-port 일렉트로닉스
Electronics design
KNU electronics version 2
그림 2. 인스톨 버전의 Low-Q IP-BPM y-port 일렉트로닉스
Change experimental scheme
Cable connection
oscillo
scope
Inside tunnelOutside tunnel
bea
m
KNU X
KNU Y
KNU LO
MOVER
ADC
Pulse
Motor
Mover
controller
Mover
remote
system
KNU
KNU
KNU
KN
U
mo
du
le
KN
U
mo
du
le
KN
U
mo
du
le
Ref