https://indico.cern.ch/event/807540/ n_TOF Target #3 Production Readiness Review Introduction and Organization M. Calviani (EN-STI) n_TOF Target #3 Project Leader https://indico.cern.ch/event/807540/ 29th May 2019 EDMS 2158279

Welcome to reviewers and participants 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

CERN’s accelerator complex and n_TOF 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 http://home.cern/about/experiments/ntof 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

n_TOF facility timeline 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 n_TOF Target #3 Project n_TOF facility started operation in 1999 with 1st generation spallation target (Target #1) Run#1 from 1999-2004 – stopped due to significant increase in water contamination 2nd generation target (Target #2) was then built and installed in 2008, with a foreseen lifetime of 10 years Run#2 completed successfully in December 2018 (2009-2018) at the programmed EOL of Target #2 3rd generation spallation target (Target #3) foreseen to be installed during CERN’s Long Shutdown 2 (2019-2020), to guarantee n_TOF operation until LS4 (~2030) (Run #3) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

CERN operational schedule Target #3 installation Target #3 programmed EOL 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

n_TOF Target #3 Project Milestones n_TOF Target #3 Project timeline - May 2019   Run2 Long Shutdown 2 S1 2016 S2 2016 S1 2017 S2 2017 S1 2018 S2 2018 S1 2019 S2 2019 S1 2020 S2 2020 S1 2021 Preliminary design studies Prototyping work Detailed design of baseline target HiRadMat tests Target construction Removal of target #2 Target #3 dry run tests Installation of target #3 & services Target shielding reconfiguration Commissioning with beam Target #3 Project started early 2016 – expected to be completed in 2021 Preliminary Design Review (PDR) June 2017 (PDR, EDMS 1837722) Intermediate Engineering Design Review (IEDR) May 2018 (IEDR, EDMS 2000974) Internal Design Review (IDR) Production Readiness Review (PRR) 29th May 2019 Target Installation Review (TIR) Q2 2020 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

n_TOF Target #3 PRR reviewers Maurizio Vretenar (CERN ATS/DO) (chair) Alessandro Bertarelli (CERN EN/MME) Gilles Favre (CERN EN/MME) Leonel Ferreira (CERN TE/VSC) Enrique Gonzales (CIEMAT, n_TOF), remotely connected Alexander Huschauer (CERN BE/ABP) Leslie Jones (STFC RAL/ISIS neutron source) Stefan Roesler (HSE/RP) Stefano Sgobba (CERN EN/MME) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

n_TOF Target #3 PRR reviewers charge EDMS 2127768 The main scope of the current Production Readiness Review is to assess the production readiness of the Target #3 and the ability to start the production phase. A review of the design of the components and the functionality falls also within the scope of the review The review panel is requested to: Analyse the detailed design of the baseline Target #3, constituted by a sliced N2-cooled bare Pb target with fully decoupled moderators to service EAR1 and EAR2 Address the recommendations of the Intermediate Engineering Design Review and their appropriate implementation (where applicable) in the baseline design of Target #3 Identify any evident showstopper or missing aspect in the current Target #3 design that might hinder the successful operation of the spallation target starting from 2021 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Questions for the PRR reviewers (1/5) EDMS 2127768 Globally assess the appropriateness of the baseline Target #3 (sliced N2-cooled bare Pb target) with respect to the operational requirements and operational history of the facility, including safety aspects Is the baseline design of the spallation target matching the requirements of the n_TOF Collaboration in terms of physics reach for Run3 and Run4 (i.e. from 2021 to 2030)? Assess whether the current proposed PS beam parameters (intensity, beam sizes, average power) assumed for the target design are realistic for post LS2 operation and whether the target is adapted to these parameters 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Questions for the PRR reviewers (2/5) EDMS 2127768 Do you see any fabrication and production showstoppers or, more generally, feasibility issues in the proposed baseline design (target core, pressurized vessel, moderator assembly, etc.) in view of their production? Is the design of the EAR1 and EAR2 moderator(s) adapted to the requirements of the Target#3 spallation target mechanics and physics? Is there any possible improvement that could/should be implemented before the construction phase? Are the prototyping activities associated to the bimetallic transition for the EAR1 moderator adapted to launch the production of the spallation target? Is there any specific precaution that has to be taken into account which appears not to have been considered during the review? 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Questions for the PRR reviewers (3/5) EDMS 2127768 Are the target core & vessel prototyping activities adequate for the challenges associated to the construction and operation of Target#3? Do you see areas of required investigation? Is the design of the anti-creep plate adapted to cope with its stated functions, i.e. retaining the Pb plates while guaranteeing a sufficient wet area for cooling the target for the target predicted lifetime? Do you see any potential showstopper in the executed finite element model / thermo-mechanical calculations, for both nominal and for degraded operational scenarios? Are there specific topics or analyses which have been underestimated and would require further studies before beam operation? 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Questions for the PRR reviewers (4/5) EDMS 2127768 Are the performed Target #3 CFD studies appropriate for the current status of the Target #3 design? Are there any other investigations that would need to be performed? Assess whether the HiRadMat tests conducted at the end of 2018 and the resulting investigations (including the focusing on the N2 static target) are appropriate for the current status. Is there any specific PIE that – compatible with budget – would be useful to execute in the coming months? Are there any specific worries from an electrochemical compatibility point of view or erosion/corrosion problems expected with the proposed baseline target? 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Questions for the PRR reviewers (5/5) EDMS 2127768 Is the design and progresses on the design of the N2 cooling and moderator(s) station adapted to cope with the operational requirements of the new spallation target? Is there any major improvement that would need to be implemented before the tendering phase? Finally, are the any specific concerns that should be addressed before the start of the Target production and before the Target Installation Review to take place during 2020? The Committee is requested to provide a written report to the n_TOF Target #3 Project Leader and to the EN-STI Group Leader within 1.5 months from the review. 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 PRR agenda (morning) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 PRR agenda (morning) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

PRR agenda (afternoon & wrap-up) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Documents available for reviewers Significant amount of documentation provided to PRR reviewers in order to assess the status of the Project Since the start of the Project, lots of attention on documentation matters https://edms.cern.ch/project/CERN-0000094374 Asset management – PXTARTF003 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Final remarks to speakers Speakers must strictly keep their allotted time Few questions can be made at the end of each talk (5 minutes) Discussion time for more detailed questions will be available at the end of each session (morning & afternoon, 30 minutes) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 Acknowledgments Thanks to all n_TOF Target #3 Project members for their commitment and support across the whole range of activities, especially DOCT, FELL & PJAS resources Also to the different Groups across the ATS Sector who contribute to the development of the different solutions, prototypes and beam tests To the n_TOF Collaboration for providing a constant stimulus to the technical teams in order to provide the best possible neutron beam for TOF measurements Thanks to the CERN’s Accelerator Consolidation Project (ACC-CONS) for financing and supporting this activity 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Thanks a lot The Project wishes you a productive day! 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

Thanks

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 Facility was conceived in 2000 and operated with a Pb target immersed in a pool with cooling water Design limitations: Insufficient cooling at hot-spot Surface oxidation due to rupture of protective layer when flushing Mechanical instability Lack of water chemical stabilization Target #1 prior to installation 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

n_TOF target #1 (1999-2004) Target #1 removal in 2014 Oxidized target, structural failures p+ beam impact point n_TOF target #1 (1999-2004) Target #1 removal in 2014 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 New target was built in 2008 Target in a AW6082 pressurized vessel Monolithic lead core Water chemistry monitored (ppb O2 content) Intensity limited to 1.66*1012 p/s to avoid local boiling Cooling (light water) and moderator (boric acid) circuits separated 400 mm 600 mm 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279

M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279 10 years operation: Average conductivity <0.15 mS/cm Oxygen content <80 ppb Purified N2 flush via a Liqui-Cel® membrane Full continuous purification via nuclear grade ion exchangers (Purolite® NRW3240) O(10) kBq/l spallation products diffused in the water loop (195Au, 203Hg, 175Hf, 185Os, etc.) 29 May 2019 M. Calviani - n_TOF Target #3 PRR Introduction - EDMS 2158279