The nTOF Collaboration http www cern chn TOF

The n_TOF Collaboration, http: //www. cern. ch/n. TOF Status of Experimental Area 2(EAR 2) Project Enrico Chiaveri Spokesperson of n_TOF Collaboration E. Chiaveri INTC Meeting June 2013

Proton status THANKS TO THE PS TEAM ! E. Chiaveri INTC Meeting June 2013

List of Experiments 2012 1. Neutron capture cross section of 25 Mg and its astrophysical implications (CERN-INTC-2012 -003 / INTC-P-320) 1. Micromegas detector for 33 S(n, a) cross section measurement at n_TOF(CERN-INTC-2012 -006 / INTC-P-322) 1. The (n, a) reaction in the s-process branching point 59 Ni (CERN-INTC-2012 -011 / INTC-P-327) 4. Fission Fragment Angular Distributions in the 234 U(n, f) and 236 U(n, f) reactions (CERN-INTC-2012 -016/INTC-P-303) 5. Measurements of neutron-induced capture and fission reactions on U-235: cross sections and alpha ratios, photon strength functions and prompt gamma-ray from fission(CERN-INTC-2011 -045 / INTC-P 309) E. Chiaveri INTC Meeting June 2013

List of Experiments 2012 6. Neutron capture cross section of 93 Zr (CERN-INTC-2011 -046 / INTC-P 310) 6. Measurement of the fission cross-section of 240 Pu and 242 Pu at CERN's n. TOF Facility(CERN-INTC-2010 -042; INTC-P-280) 6. Spin assignments of nuclear levels above the neutron binding energy in 88 Sr (CERN-INTC-2011 -030 / INTC-P-304) E. Chiaveri INTC Meeting June 2013

EAR 2 design Beam Dump EAR-2 Exp. Hall Start of construction work by May 2013. Ready in April 2014. Collimator New area Magnet Neutron fluence increase by a factor 18 -25 wrt. EAR-1 Existing area Pit shielding Target E. Chiaveri

Experimental Area(EAR 2) Project � Simulations work ✔ � Civil Engineering ✔ � Radiation Protection ✔ � Cooling & Ventilation ✔ � Electrical Infrastructure ✔ � Permanent Magnet ✔ � Access ✔ � General Infrastructure ✔ � Safety file ✔ E. Chiaveri INTC Meeting June 2013

Simulations performed until now Dump Detailed geometry description in FLUKA � Groups of Simulations: � q Spallation Target q ISR, Access gallery, Permanent magnet q Collimators q Experimental Area and Dump EAR 2 ISR or at im oll 1 st Collimator p m Du V. Vlachoudis Spallation Target C nd Magnet 2 t et rge gn Ta Ma Pb 2 nd Collimator INTC Meeting June 2013

Neutron pipe Spallation Target • • • Moderator • Spallation target Container 8 V. Vlachoudis • Neutron moderator Beam pipe layout Fluence and resolution estimation Dose to electronics Optimization of the neutron target for future upgrade Determination of neutron gain by shifting the vertical pipe to neutron maximum Activation calculation of the present spallation target and container for a possible decommissioning in 2018 g-flash INTC Meeting June 2013

1 st Collimator, Magnet & Shielding • Introduction of a removable 1 st collimator: • Shaping the beam for the capture Permanent Magnet • • collimation setup Background reduction in ISR Magnet protection • Permanent magnet Additional Shielding For ISR • Field intensity needed • Dose (degradation of magnet) • Activation calculation 1 st Collimator 9 V. Vlachoudis INTC Meeting June 2013

ISR Shielding • Dose reduction in ISR tunnel • Permanent work place • Crane level ISR tunnel Existing Shielding < 0. 5 m. Sv/h Non-permanent work place < 2. 5 m. Sv/h • Lot’s of constraints: • • Keeping the existing crane Amount of shielding Existing cables/piping n_TOF PS-line controls • Numerous shielding options have been evaluated 10 V. Vlachoudis INTC Meeting June 2013

Second Collimator, EAR, Neutron Dump • Ongoing Collimator study Neutron Dump External Wall • • • Capture Fission setup Minimize Background Beam Profile Detector response • Optimization of Neutron Experimental Area dump • External shielding wall • Dose due to skyshine • Residual dose rate and air activation 2 nd Collimator 11 V. Vlachoudis INTC Meeting June 2013

Optimized beam dump for capture measurements Concrete 15 cm layer of borated paraffin Iron 5 cm layer of borated carbide I. Bergstrom INTC Meeting June 2013

FØ 1 cm vs 1 st Collimator / Halo radius For a simplified setup Selected Capture Setup Flux-Ø 1 cm at 150 cm distance in the center of beam (Neutron Energy e. V-ke. V) for various collimator/halo configuration versus radius of 1 st collimator V. Vlachoudis INTC Meeting June 2013

EAR 2 overall view Experimental Area 2 design EAR-2 ISR Tunnel E. Chiaveri INTC Meeting June 2013

Ground Breaking Ceremony for EAR 2 E. Chiaveri INTC Meeting June 2013

TOF tube coring L. Lopez INTC Meeting June 2013

Support of the coring from technical gallery L. Lopez INTC Meeting June 2013

TOF tube towards technical gallery L. Lopez INTC Meeting June 2013

Début des travaux: 23/05/13 Planning intentionnel de l’entreprise = 7 mois A. Lopez INTC Meeting June 2013

Use of radioactive samples � Benefit from operating experience of EAR-1 (since 2010) � EAR-2 will be Work Sector Type A like EAR-1 � Allow handling of unsealed radioactive sources � Access changing room with decontamination facility � Radiation monitoring � Ventilation � Working procedure � Fume cupboard: � � E. Chiaveri Used to install/remove samples in/from detectors Limit the need for transport (currently done in ISOLDE) INTC Meeting June 2013

EAR 2 access & configuration 21

EAR 2 access & configuration Access door interlocked with beam EAR 2 (also class A) Class A lab Material entrance Changing room E. Chiaveri INTC Meeting June 2013

EAR 2 - Building 380 E. Chiaveri INTC Meeting June 2013

Permanent magnet dipole n. Tof EAR 2 800 mm 340 mm 720 mm Permanent magnet blocks Sm 2 Co 17, as a flux generator. Permanent magnet blocks Sm 2 Co 17, compensate radial stray field to improve field quality in Good Field Region. Return yoke C 10 R steel. Pole tip C 10 R steel, smooth the possible differences on the easy axis orientation of the permanent magnet blocks. Magnet weight ≈ 2000 kg Pictured: N-Tof permanent magnet dipole layout Pierre-Alexandre THONET INTC Meeting June 2013

Access gallery (375/T 8 -202 ) overview Vacuum pipe Filter station Permanent magnet shutter E. Chiaveri INTC Meeting June 2013

Collimator 1 S. Girod INTC Meeting June 2013

Installation of Collimator 1 S. Girod INTC Meeting June 2013

Service gallery Additional flange Monorail installation without EAR 2 shaft modification Filters box Magnet on rails Air tight cover Shutter S. Girod INTC Meeting June 2013

Collimator 2 Collimator Gap 30 mm Ø 80 / Ø 2 0 Ø? 320 Po ly Bo 1 m rate d Shaft Ø 800 . Ø 600 St 2 m eel Concrete cylinder S. Girod INTC Meeting June 2013

Collimator 2 Alignment system engraved in EAR 2 floor Inner collimator exchangeable (1 day) Gap 100 mm filled with concrete or balls (under study) Collimator vacuum tank S. Girod INTC Meeting June 2013

Dump: Ø 1. 6 x 1. 6 m³ steel Ø 0. 8 concrete all around S. Girod INTC Meeting June 2013

EAR 2 bunker Crane 5 tons Holes Ø 200 for general services 100 mm behind all cables trays for Borated PE support / alignment facility for detector Max size: 1. 5 x 3. 8 m³ Max load per layer: 200 Kg E. Chiaveri INTC Meeting June 2013 X-Y beam references

Sketch of possible installation of Detectors S. Girod INTC Meeting June 2013

Status of safety file � Started in Dec. 2012 the edition is in progress for the Descriptive Part • Using contributions for the design and structure available in the n_TOF experiment folder in INDICO • Using the document Safety Requirements and Safety File contents, provided by DGS/SEE for the construction of the building 380 • Expecting a Technical Design Report to be achieved with the final specifications of the experimental area within summer 2013 • The other three Parts will be initiated in parallel over the next months C. Alanzeau INTC Meeting June 2013

General Planning EAR-2 Service gallery installation E. Chiaveri INTC Meeting June 2013

Conclusions � The 2 nd experimental area EAR 2 is under construction � Most of the equipment are in construction phase � The project will be completed at April 2014 � Proposal for Commissioning EAR 2 will be presented at INTC October meeting � Proposals for EAR 1 will be presented at INTC October meeting � Proposals for EAR 2 will be presented at first INTC February 2014 meeting E. Chiaveri INTC Meeting June 2013