Measurement of the Z boson cross-section in - Harvard University ...

Chapter 2: The Accelerator and the Experiment 55
Cathode tube
Rmin
Anode wire
29.970 mm
Figure 2.10: Schematic of a drift tube in cross-section. The process of electron-ion
pair formation by a passing muon is shown. The dashed circle indicates the drift
circle.
electrodes in each plane. By combining information from adjacent cathode strips, the
µ
position of the track can be determined with high accuracy.
Strips in the two cathode planes in a CSC chamber are arranged perpendicular to
each other, such that both radial and azimuthal coordinates can be measured. The
spatial resolution of a chamber is ≈ 40 µm in the radial (bending) direction and ≈ 5
mm in φ. The CSCs also have an excellent time resolution of 7 ns. The total number
of CSC channels is 30,700.
Trigger technologies
The main requirements on the muon trigger system are fourfold:
• It must be able to roughly estimate the momentum of a track within a few tens
of nanoseconds after its passage. This requires fast signal generation and a fine