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