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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

Preliminary results from the Alcator C-Mod polarimeter.

P Xu¹, J H Irby, W F Bergerson

¹Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. pxu@mit.edu

The Review of Scientific Instruments

|November 2, 2010

Summary

This summary is machine-generated.

A new far infrared polarimeter diagnostic is being developed for the Alcator C-Mod tokamak to measure plasma properties. Initial tests show acceptable noise levels for studying magnetic field fluctuations and the q-profile.

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Area of Science:

Plasma physics
Fusion energy research
Diagnostic instrumentation

Background:

The Alcator C-Mod tokamak requires advanced diagnostics for plasma characterization.
Understanding the q-profile and fluctuations is crucial for fusion energy development.

Purpose of the Study:

Develop and test a poloidally viewing far infrared polarimeter diagnostic.
Determine the safety factor (q-profile) and study plasma fluctuations.
Assess the feasibility of a multi-chord system for comprehensive measurements.

Main Methods:

Design and fabrication of a three-chord polarimeter system.
Bench testing of a single-chord mock-up.
Analysis of noise sources and reduction techniques.

Main Results:

A three-chord system has been designed and fabricated for installation.
Bench tests indicate acceptable noise levels for planned measurements.
Techniques for diagnosing and reducing noise have been identified.

Conclusions:

The developed polarimeter diagnostic is suitable for Alcator C-Mod.
The system will provide valuable data on the q-profile and plasma fluctuations.
Further development towards a ten-chord system is planned.