Online Spin Flip

This main page of Spin Flip Control System for Hall A He3 Polarized Target.

Some Quick Links:

• Shift Worker Quick Start
• Experiment Transversity
• Target Index Page

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

1. Control the target spin flip consequence
2. Acquire and Record target spin state
3. Output target spin related information into DAQ system, therefore data stream
4. Interaction with human (Target Operator)
5. Communicate with related target software/hardware

Physics of Spin Flip

Please refer to Thesis of Xiaochao Zhen [1], Charpter 4 Polarized He3 Target

System Structure

Spin Flip System Diagram

Exception Handling

Status Page

Status Page Contain two list of status reports of target control software. They are User Report and Automatic Report.

• User Report are generated by pressing "generate report" button on target Main Control GUI.
• Automatic Report are automatically generated after every spin flip or once an error occured.