GPS pM3.2 Instrument User Guide

About this manual

This guide provides detailed procedures for safely operating the GPS pM3.2 muon spectroscopy instrument at the Paul Scherrer Institute. It covers regulations, beam‑area access control, instrument components, sample environment, magnetic field settings, and troubleshooting.

The document includes step‑by‑step instructions for closing, entering, and freeing the beam area, as well as quick‑reference information for the MOGLI vacuum system and magnet power supplies.

What's inside

• Regulations and safety
• Beam area access (pM3.2)
• Instrument description and detectors
• Sample environment (cryostats, ovens, etc.)
• Instrument magnetic fields
• Muon beamline and spin rotator
• Vacuum system (MOGLI) quick references
• Magnet power supplies
• Annexes

Specifications

Frequently asked questions

What safety equipment must be carried while working in the experimental hall?

Every user must carry a dosimeter provided by the dosimetry office during working hours.

How can I start the MOGLI vacuum system?

Connect the 380 V power, ensure compressed‑air and vacuum lines are attached, verify the FPS display shows PST OFF and HV LOCKED, then press PST ON (F1) to start MOGLI.

What are the current and voltage limits for magnet power supply QTH31?

QTH31 is rated for a maximum current of 120 A and a voltage limit of 50 V.