High sensitivity He desorption leak detection method

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.578511· OSTI ID:6037224

Rao, M G ^[1]

---

1. Continuous Electron Beam Accelerator Facility, Newport News, Virginia 23606 (United States)

A new high sensitivity leak detection method has been developed for the superconducting radio-frequency (SRF) acceleration cavities for the CEBAF linacs. The vacuum integrity of the SRF cavity pairs and the associated indium-sealed vacuum flanges is essential for the successful operation of the accelerator. These SRF cavity pairs are immersed in superfluid helium to minimize rf heat load to the cryogenic system. Conventional leak detection techniques are not appropriate to leak check these cavity pairs at superfluid helium temperature (2 K), since He will be adsorbed onto the cavity surfaces. Further, the sensitivity of the conventional leak detectors is limited to 10[sup [minus]11] atm cm[sup 3] s[sup [minus]1] at 293 K. In this article, the details of the He desorption leak detection procedure and the results with production cavity pairs are presented.

• DOE Contract Number: AC05-84ER40150
• OSTI ID: 6037224
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 11:4; ISSN 0734-2101; ISSN JVTAD6
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
CAVITY RESONATORS
CEBAF ACCELERATOR
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FLUIDS
GASES
HELIUM
LEAK DETECTORS
LEAK TESTING
LINEAR ACCELERATORS
NONMETALS
RARE GASES
RESONATORS
RF SYSTEMS
SENSITIVITY
SUPERCONDUCTING CAVITY RESONATORS
SUPERCONDUCTING DEVICES
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TESTING