HAPPEX Charge Asymmetry Feedback

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The HAPPEX DAQ is run to provide beam charge asymmetry feedback for the Polarized 3He experiments. This page will briefly describe the the system, and how to recover it if it does not work.

Introduction - The Feedback Loop

Feedback loop.png Summary of the components (pink boxes):

Polarized Source - IA Cell

Hall A - Beam Current Monitor

HAPPEX DAQ - Counting House Crate

Parity Analyzer (PAN) - compiled specifically for feedback

Summary of the communications (arrows)

CW Electron Beam

BCM Downconverter - TWINAX Cable

CODA - Event Transfer (ET)