| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1690229 | Vacuum | 2013 | 7 Pages |
A turbo-molecular pump with magnetic bearing type Oerlikon Leybold MAG W 2800 has been tested under tritium atmosphere for one year with an overall throughput of about 1.3 kg of tritium (≈5 × 1018 Bq) in a closed loop. Evolution of gas composition has been regularly checked by in-line mass spectrometry. Experimental data of two long term tritium runs followed by a non-tritium run are shown. Results are discussed with regard to materials used inside the pump volume. Possible consequences for the use at the KATRIN experiment are given.
► We designed and built a new tritium test experiment for closed loop circulation with a throughput of several grams per day. ► We operated the closed tritium loop for one year with a TMP MAG W 2800 and approx. 1.3 kg tritium in total. ► We used mass spectroscopy for determination of radiation induced aging effects on non-metallic parts inside TMP. ► We see an increased production of hydrocarbons due to non-metallic parts inside the TMP pumping volume.
