Progress Report WP5-Task A at CERN Since last meeting EURISOL WP5 Warsaw June 2006
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Completed: work on shielding design and other RP issues for the MMW target station see next slides and detailed results in: M. Felcini, Note EURISOL DS/ TN-06-XX, “Optimized radiation shield design for the EURISOL multi-MW target station” M. Felcini, Note EURISOL DS/ TN-06-XY, “Survey of radiation protection requirements for the multi-MW target station” Th. Otto, Note EURISOL DS/ TN-06-XZ, “Breeding of fissile isotopes in EURISOL multi-MW targets” (notes still to be posted on EURISOL WP5 web site) -
Started (since mid-September when target design parameters have been made available, see L. Bruno’s talk): work on shielding design and other RP issues for the direct 100 kW target stations. Work in progress, results for the EURISOL Town Meeting
October 12th, 2006 EURISOL Meeting WP2,3,4,5.-LMU Munich
Marta Felcini CERN & UCLA
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Shielding design for the multi-MW target station Multi-MW target engineering design by WP2 (Y.Kadi et al.) and WP4(L.Tecchio et al)
Calculation (using FLUKA code) of the Dose equivalent rate (Sv/h)as a function of R-Z Study case: Shielding starts 20 cm away from the target Shielding materials: 2 m steel followed by 2m concrete
R Z Note: study case includes only the actual target as the radiation source. As more details become available for the target assembly (in particular the mercury loop and forward part, see Adonai’s talk) they will be included in further RP studies. October 12th, 2006 EURISOL Meeting WP2,3,4,5.-LMU Munich
Marta Felcini CERN & UCLA
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Radiation attenuation curves From dose equivalent rate as a function of R,z derive attenuation curves in steel and concrete at different angles Fit attenuation curves to derive radiation attenuation lengths in steel and concrete at different angles Impose that the radiation shield has to reduce effective dose rate to 1μ Sv/h and determine concrete and steel thickness values which satisfy such a condition
October 12th, 2006 EURISOL Meeting WP2,3,4,5.-LMU Munich
Marta Felcini CERN & UCLA
3
Calculated thickness of steel+concrete shield
Concrete thickness
Steel thickness 100
900
140 180 220 260 300
azimuthal angle October 12th, 2006 EURISOL Meeting WP2,3,4,5.-LMU Munich
Concrete thickness vs θ needed after 1 m of steel to reduce effective dose at the shield surface to 1μ Sv/h
Marta Felcini CERN & UCLA
target 0 180
θ
00
Beam direction
Result: after 1 m steel need Forward (0 deg): 9 m concrete At 90 deg: 8 m concrete Backward (180): 6 m concrete Note: The above is an example minimizing material cost. In the final design, steel and concrete shield dimensions should be chosen to 4 minimize both material and disposal cost
Other RP issues for the multi-MW target station Additional issues other than target station shielding: - Activation of the target and target area and the resulting radiation dose to the personnel - Protection of the personnel against radioactive contamination - Protection against gaseous and aqueous releases to the environment - Handling and storage of produced radioactive wasted Made a survey of existing high-power facilities (SNS, TRIUMF, Fermilab, CERN, GANIL, PSI), proposed solutions and discussed their impact on the design and operation of the facility Details reported in an incoming EURISOL note. M. Felcini, Note EURISOL DS/ TN-06-XY, “Survey of radiation protection requirements for the multi-MW target station” NOTE: The above note gives a list of requirements and suggests realistic solutions. However the detailed design of a target station satisfying the above requirements needs engineering studies specific to the EURISOL MMW target, which will be done in the framework of WP2 and WP4. October 12th, 2006 EURISOL Meeting WP2,3,4,5.-LMU Munich
Marta Felcini CERN & UCLA
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Summary and open issues -
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Work on shielding design of the MMW target station is completed (report issued) Work on breeding of fissile elements in the MMW target is completed (report issued) Other RP issues (activation, contamination, handling and disposal) for the MMW target and target station have been addressed (report being issued). RP studies for the 100 kW direct target stations have started. First results expected for the EURISOL town meeting (if presentation time will be granted) Open issues: are details available (going to be av.ble when?) about the design of the - Beta-beam target? - EURISOL proton driver? - Mass separator and post-accelerator, incl. beta-beam?
October 12th, 2006 EURISOL Meeting WP2,3,4,5.-LMU Munich
Marta Felcini CERN & UCLA
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