Status of Radiation Protection studies in support of ELENA R. Froeschl and J. Vollaire DGS-RP-AS.

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Presentation transcript:

Status of Radiation Protection studies in support of ELENA R. Froeschl and J. Vollaire DGS-RP-AS

List of RP studies for ELENA / AD ELENA Integration and Installation29/03/20122  Shielding of the ELENA ring  Construction of Building 193 extension (on top of TT2)  Shielding reinforcement in the ATP area  New chicane for AD ring access point (Installation of new access system on the PS complex in LS1)

Shielding for ELENA ring (R. Froeschl)  Detailed layout of the ELENA shielding wall implemented in FLUKA 3ELENA Integration and Installation29/03/2012 Thx to O. Choisnet for layout

Beam losses I 4  Considering beam losses at worst locations (close to walls or chicane openings) closed 3 2a 2b 1 ELENA Integration and Installation29/03/2012

Beam losses II 5  Energy 5.3 MeV (injection)  Beam intensity  Injected: 3E7 antiprotons/cycle  Ejected: 1.6E7 antiprotons/cycle  Normal Loss  1.4E7 protons/cycle  1 cycle every 60s (now 100s)  Loss rate  2.33E5 antiprotons/s (1.4E7/60s)  47% of full loss rate ELENA Integration and Installation29/03/2012

Loss point 1 6  Beam line level  Platform level ELENA Integration and Installation29/03/2012

Loss point 1 – Side view 7ELENA Integration and Installation29/03/2012

Loss point 2a (smallest distance 2b) 8ELENA Integration and Installation29/03/2012  Beam line level  Platform level

Loss point 2a (smallest distance 2b) Side view 9ELENA Integration and Installation29/03/2012

Loss point 3 10  Beam line level  Platform level ELENA Integration and Installation29/03/2012

Preliminary conclusions ELENA shielding 11  Shielding thickness compatible with AD hall classification  Location of the platform (visitors) to be properly chosen to ensure minimum exposure (it has to be moved away from the shielding enclosure)  Concrete blocks implementation must ensure 80 cm of shielding (connection of slanted walls….) ELENA Integration and Installation29/03/2012

Building Extension on top of TT2 12  Similar strategy than for the new barracks (Build. 93)  6 m of earth vertically from TT2  Trench along Build. 193 to be covered with 80 cm of concrete (included in Building design)  Radiation monitor will be installed inside the building extension (included in monitoring budget)  Excavation and work in trench to be conducted in LS1 (no beam in TT2)  Possible PSNF would be 23 m away  Official RP approval to be communicated by memo very shortly ELENA Integration and Installation29/03/2012

Chicane for the AD access point 13  Part of the integration studies for the PS Access System Renovation project (installation of PAD/MAD)  Current access point allows direct line of sight with the beam line, opportunity to improve the situation….  Latest proposal does not provide a sufficient shielding overlap…. ELENA Integration and Installation29/03/2012

Shielding improvement the ATP area 14  Door D321 bis to be relocated and shielded to be added  Existing FLUKA geometry of TT2/ATP does not include details of the area  Layout of the area needed to update the FLUKA model and identify additional shielding requirements (scan performed lately) ELENA Integration and Installation29/03/2012