A Wire Chamber Setup
A Wire Chamber Setup
MWPC Setup vs. DWC Setup
MWPC Setup vs. DWC Setup

Origins of the DWC from Information about the T9 beam line and experimental facilities:
  • Particle and Photon Tracking Device developed at CERN by Georges Charpak
  • Evolution of the Multiwire Proportational Chamber (MWPC)
    • The MWPC detects the position of a charged particle by indicating the wire closest to the particle position VERSUS
    • The DWC, which "improves the position resolution by also measuring the time between the particle passage and delay of the chamber signal which is measured via a delay line."
      • "The delay measures the distance betweeen the particle and the wire.
        • Note: "Position resolutions of 100 to 200 microns can be achieved. However, the chamber can only measure one particle inside a certain time window."
      • 1 DWC is part of the "fixed" beam line setup, but two can be easily added for the experiment if necessary."

How a MWPC Works - from Particle Detectors
  • Purpose of a Particle Detector: "...to quantify the momenta and discover the identity of the particles that pass through it after being produced in a collision or a decay - an 'event'." (Page 4)
  • Tracking a Charged Particle's Path
    • Multiple wires equally spaced apart between two parallel cathode plates
    • Each wire serves as an individual counter
      1. Charged particles leave a trial electron-ion pairs going through the chamber.
      2. Electrons from the trial move to the nearest wire and cause a voltage impulse.
      3. The location of "another such configuration" at a right angle will help form a grid.
      4. The wires of the second part of the grid will be pulsated, revealing the path of the charged particle

For clarification on how a DWC works and how it compares to an MWPC, see The Delay Wire Chamber