LEP cavities L. Ulrici, B. Cellerier, DGS-RP-RW EPPCN meeting, CERN, 29 Novembre 2012.

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Presentation transcript:

LEP cavities L. Ulrici, B. Cellerier, DGS-RP-RW EPPCN meeting, CERN, 29 Novembre 2012

LEP CAVITIES -The copper cavities were installed in the LEP collider in 1983 and used until LEP: electron and positron beams -Energy during exploitation of these cavities: 50 GeV -The weight of the cylindrical cavity is about 2 tons -The weight of the sphere is about 1 tons

Details Cavities in good status Cavities in bad status (not suitable for physics/tests)

INVENTORY numberCandidate free-release RadioactiveWithout tuner Good statusBad status 35cavities cavitiesNA spheres8- Total of 55 cavities and 8 spheres are available (1 cavity has been cut and dismounted for analysis) Official confirmation of availability of the cavities foreseen for the end of the 1 st quarter 2013

Free-release Clearance from regulatory control: Swiss RP regulation – Specific activity: clearance according to Swiss Ordinance ( ) – Dose rate: < 0.1  Sv/h in 10 cm distance – Contamination: below nuclide specific levels listed in the Swiss Ordinance ( ) Regulatory control Exemption for practices small amount of material Exclusion Cannot be regulated e.g. K-40 in human body Clearance Result of practices large amount of material A priori A posteriori

Present status Free Release Procedures and measures to be revised and approved by the Swiss authorities ( Federal Office of Public Health) RADOS RTM 644 RADOS RTM 661 « Total gamma » monitors:

Formalities for reception of these cavities Notification of interest to receive one or more cavities: – to be addressed to CERN’s press office +41 (0) – Specifying: number of cylindrical basis and/or spheres the scope of the request ( re-use, exhibition, etc. ) In case of interest to receive only a part of a cavity (e.g. for exhibition), the costs for handling and cutting will be charged. – Cost : a few hundreds to a few thousands CHF (depending on complexity of the requested cut) – Delivery delay The cavities are delivered together with a protocol certifying the type and results of the measurements and the Swiss limits for clearance. The comparison with the local radiation protection regulation and eventual local requests for authorization for transport/exhibition is not done by CERN.