Something about Asymmetry,Happex
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Something about Asymmetry,Happex
Pengjia 2/8/2012
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Asymmetry test Diagram
Injector
Helicity BoardPockels Cell HV
Circular polarization of laser light
Spin of photo-emitted electrons
Counting HousePair Sync
Delayed Helicity
QRT
MPS
Happex Crate
change
change
output
Fiber
Moller
Compton
Left ArmHappex Crate
SIS3801 Scaler
Right ArmHappex Crate
SIS3801 Scaler
Third ArmSIS3801 Scaler
Helicity Board
Undelayed Helicity
V2F
Use undelayed helicity to generate a DAC signal with a known value of asymmetry
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Asymmetry test
•The result is consistent between two arm’s happex, scaler and moller•Chao will show the pictures in detail•Still can not understand why it is not consistent during commission between hall A scaler with hall C and moller(hall A scaler,hall C,moller’s signal came from the same V2F)
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bcm signal split problem
Left Happex Crate
Right Happex CrateV2F
Left arm Scaler Right arm Scaler 3rd arm Scaler
moller Hall C feedback MCC feedback
……
BCM electronic
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Will reduce asymmetry resolution ….
Just connect to 1 happex ADC Copy to 2 happex ADC
Copy to 1 happex ADC and 1 V2F Copy to 2 happex ADC and 1 V2F
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reflection signal from happex and V2F
reflection from happex reflection from V2F
reflection from happex and V2F
Use pulser to check
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Happex DAQ improvement
Pulling Trigger interrupt
Before Right now
97% of cpu occupyNeed to set system clock rateCpu is easy to crash
18% of cpu occupyDon’t need to set clock rateCpu is more stable
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Happex DAQ Settings Before
TimingBoard
HAPPEXADC
FLEXIO
MPS
VXWORKS CPU
trigger
trigger
Pair Sync
QRT
Helicity no
yes
RingBuffer Server
Read Flexio
Extract Pair Sync
pair sync changed?
Delay 0.x ms
Read ADC
Check&Predict Helicity
Write to RingBuffer
TCP- IP Server
Ring Buffer
Linux
TI
HRSTrigger
Superviser
T1,…,T8trigger
CODA
Event Builder
Event Recoder
control
Read
*.dat
OtherROCs & TIs
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Happex DAQ Settings Right now
TimingBoard
HAPPEXADC
FLEXIO
MPS
VXWORKS CPU
trigger
trigger
Pair Sync
QRT
Helicity no
yesRingBuffer Server
Read ADC,Flexio
Write to RingBuffer
TCP- IP Server
Ring Buffer
Linux
TI
HRSTrigger
Superviser
T1,…,T8trigger
CODA
Event Builder
Event Recoder
control
Read
*.dat
OtherROCs & TIs
BaseLine
trigger
trigger