Difference between revisions of "Online Spin Flip"
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== System Structure == | == System Structure == | ||
| − | [[Image:Spin Flip System.png|thumb|Spin Flip System Diagram]] | + | [[Image:Spin Flip System.png|thumb|Spin Flip System Diagram]] |
| + | As Shown in the [[:media:Spin Flip System.png|Spin Flip System Diagram]], Spin flip system work closely with [[target|target hardware installations]] and [[DAQ]] system. This system is divided into 4 levels: | ||
| + | # '''User interface''' : Display system status to user and take user command. Also notify user if an exception has occurred. | ||
| + | # '''Core''' : The core layer generate and execute a spin flip command on target, collect the respond, decide target status. If an exception occurred, it will try to handle the situation. Meanwhile, target information will be send to both user and DAQ. | ||
| + | # '''Flip Confirmation''' : During a flip, target will radiate an NMR signal will be collected and processed through the pick-up coil, Lock-In Amplifier and a signal analyzer. The output will be current spin state, which is feed into system status manager. | ||
| + | # '''Failure Detection''' : This layer will monitor status of Quarter-Wave Plate, which control laser polarization. It will ensure laser polarization is keep pumping the target in the correct direction. | ||
== User Interface == | == User Interface == | ||
Revision as of 13:34, 23 July 2008
This main page of Spin Flip Control System for Hall A He3 Polarized Target.
Some Quick Links first:
Contents
Introduction
Spin Flip System is designed for controlling Hall A Polarized He3 Target automatically flip spin direction during experiment run time. The physics goal is to reduce systematic false asymmetry, driven by experiment Transversity and d2n.
Core functions for this system are
- Control the target spin flip consequence
- Acquire and Record target spin state
- Output target spin related information into DAQ system, therefore data stream
- Interaction with human (Target Operator)
- Communicate with related target software/hardware
For quick learning this system, please read Shift Worker Quick Start.
Physics of Spin Flip
Please refer to Thesis of Xiaochao Zhen, Charpter 4 Polarized He3 Target
System Structure
As Shown in the Spin Flip System Diagram, Spin flip system work closely with target hardware installations and DAQ system. This system is divided into 4 levels:
- User interface : Display system status to user and take user command. Also notify user if an exception has occurred.
- Core : The core layer generate and execute a spin flip command on target, collect the respond, decide target status. If an exception occurred, it will try to handle the situation. Meanwhile, target information will be send to both user and DAQ.
- Flip Confirmation : During a flip, target will radiate an NMR signal will be collected and processed through the pick-up coil, Lock-In Amplifier and a signal analyzer. The output will be current spin state, which is feed into system status manager.
- Failure Detection : This layer will monitor status of Quarter-Wave Plate, which control laser polarization. It will ensure laser polarization is keep pumping the target in the correct direction.
