Oct 15 – 20, 2017
Europe/Paris timezone

Helium Burst Incident at the PROSCAN Medical Cyclotron Facility

Oct 18, 2017, 4:00 PM
1h 30m


Poster Medical Accelerators 11- Poster Session


Dr Peter Hottinger (Paul Scherrer Institute)


PROSCAN is a proton irradiation facility for tumor treatment at the Paul Scherrer Institute in Switzerland; it is in operation since 2007. At the heart of the facility is COMET, a compact, super-conducting 250 MeV cyclotron. The facility serves three Gantries for generic tumor treatment, OPTIS 2 for eye cancer treatment and the proton irradiation facility (PIF) for radiation resistance tests of electronics. PROSCAN is operated 52 week per year, four to five days per week for cancer treatment. The facility is operated most weekends as well for PIF. About eight long weekends a year are scheduled for maintenance.
On the maintenance weekend in October 2016 a severe incident happened that caused an interruption of several days. The cryostat warmed up suddenly and the evaporating liquid Helium bursts out of the He tank. The poster will describe the sequence of events and presents the measures taken to prevent a similar event from happening again.

Primary author

Dr Peter Hottinger (Paul Scherrer Institute)


Markus Kostezer (Paul Scherrer Institute)

Presentation materials