Vacuum system upgrade for extended Q-range small-angle neutron scattering diffractometer (EQ-SANS) at SNS

Area of Science:

• Neutron scattering techniques
• Materials science instrumentation
• Vacuum system engineering

Background:

• The Extended Q-range Small-angle Neutron Scattering Diffractometer (EQ-SANS) at the Spallation Neutron Source (SNS) utilizes a large vacuum vessel.
• Existing vacuum system performance, operational ease, and maintenance required enhancement.

Purpose of the Study:

• To upgrade the EQ-SANS detector vessel's vacuum system.
• To improve pumping performance and system design.
• To minimize operational errors and enhance safety.

Main Methods:

• Systematic analysis of the existing vacuum system.
• Implementation of improved pumping technologies.
• Redesign of system components for optimized performance and user interaction.
• Development of automated control and safety interlock systems.

Main Results:

• Reduced evacuation time from atmospheric pressure to 2 mTorr from 500-1000 minutes to 60-70 minutes.
• Achieved turn-key automated control of the vacuum system.
• Integrated a multi-faceted interlock system for personnel and equipment safety.

Conclusions:

• The vacuum system upgrade significantly enhances the operational efficiency and safety of the EQ-SANS instrument.
• Optimized vacuum performance and automated controls contribute to reliable scientific data acquisition.
• The improvements facilitate easier operation and maintenance, supporting advanced neutron scattering research.