1. R2E Availability October 15 th 2014 RE Equipment G. Spiezia

2. R2E Availability October 15 th 2014 Outline  RE location and equipment  Radiation levels  Equipment list and expected failures  Possible prevention/mitigation actions  Conclusion

3. R2E Availability October 15 th 2014 RE areas  Alcoves in the ARC  One RE per side of each point  ~2 km form the main access of each point

4. R2E Availability October 15 th 2014 Radiation levels  Linear scale with beam intensity  Scale with beam energy  Beam-gas pressure:  increase with 25ns operation  how much: we don’t really know  scrubbing contribution will depend on the used scheme and efficiency at the MQ/MB close to the REs RadMonAssumptions for scaling @FLUKA team

5. R2E Availability October 15 th 2014 Radiation levels  Expected radiation levels at the entry of RE  Factor 10 between the two end sides of the RE

6. R2E Availability October 15 th 2014 Equipment  Equipment list based on the visit of the RE18  We assume that the other REs have the same equipment

7. R2E Availability October 15 th 2014 Some pictures IT-Switch Control for EN/EL Emergency Light Cryo ODH, FIRE VACUUM

8. R2E Availability October 15 th 2014 Equipment list to verify TeamEquipmentDescriptionRadiation testCriticality GS/ASEFire ODH ControlControl cardsDone ITIT- switch/TransmitterCustomDone TE/CRGCryogenicsCustomDone EN/EL Control Electrical Distr 48V Safety Light UPS Commercial TE/VACVacuumPLC, IODone EN/CVVentilationCommercial- BE/COControl equipmentOptical RepeatersNot Done EN/MEFSurveyEmpty- ITFibreCustom- BE/COTimingCustom- TE/MPEQPSSpare parts- GS/ASEAccessNo sensitive equipment- ITGSMTransmitters- To be iterated with the equipment owners

9. R2E Availability October 15 th 2014 What to expect for the next years  Assumptions  Equipment  All the REs (16 in total) have the same equipment (type and number)  3 critical (e.g. they can fail) units per each RE  Each critical unit has a cross section of 2E-8 cm 2  Fail at a fluence of 5E7 cm -2 (based on previous experience)  FLUKA calculations: Radiation levels will go from 1E6 (2016) to 8E6 (2025) cm -2  Expectations  Total dose is not a concern  SEE can appear at a fluence of ~ 1E6 cm -2  This means: we have 1 failure in 2016 and 8 in 2025(considering 3 critical units)  If the number of critical units is higher, the number of failures increases Source of uncertainty

10. R2E Availability October 15 th 2014 What we can do  Expectations  Total dose is not a concern  SEE can appear at a fluence of 1E6 cm -2  Mitigation and countermeasures  Relocation is not an option  Shielding is possible  A reduction of the radiations by a factor 8-10 is needed  Thermal neutrons are still there (source of SEE)  Test equipment to reduce as much as possible the “unknown”

11. R2E Availability October 15 th 2014 Conclusion  Radiation levels are expected to be low  Issues come from the high (total) number of (possibly sensitive) equipment (source of uncertainty)  Shielding can help  How much: it depends on the real radiation levels  To do List  Detailed inventory of the area  Test to assess the equipment sensitivity as good as possible  Re-iterate the radiation levels expectations on the basis of real measurements