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CLIC/CLEX controlsRadiation issueAugust 29th, 2012 F.Locci - BE/CO-FE

- Introduce myself and get to know you1Radiation Impacts and Hardening TechniquesM.Brugger (R2E comittee), R.Gaillard (CERN training)J.Christiansen (PH-ESE LHC Expertise and Hardness implementation)

Singular events are the most critical for operation but easier to prevent< 100 Gy/year: COTS electronics with precautionshigh-radiation level (> 1kGy/year): ASICs only (specific developments!)Positioning is crucial: distance, type of sources, distribution Shielding must be adaptedConcrete (80cm) or metal (40cm) to decrease of a factor 10Simple screen is not enough (backscatter) big impact on the finale dimension (insertion in the wall?)Should think about ventilation and cooling (confined space)

First approach:Identify the radiation characteristics (type, energie, fluence) Simulation, Monitoring?Define reliability and availability objectives project requirementsNeedless to focus on electronics solutions. Only: Architecture, Design, Environment/Protection

2August 29th, 2012CLIC/CLEX controls: Radiation issueHave direct impact on the final architecture

..RAS: daisy chain acceptable?2TBL-BPM tests (BE-CO, LAPP, BE-BI)Specify the appropriate shielding for the BPMs electronic Proposal for dedicated monitoring of the BPM rad-tol electronicsLAPP tests post-analizingFor future needs (TBTS in particular): this implies a permanent solutionCan be used to correlate data with BLMs measures & FLUKA Simulation (Sophie and Eva)Inputs for the CLIC-ACM projectBoth require some info: level of radiation and EM spectrum in the CLEXNot really easy to estimate (Experimental context) need additional inputs from Experts, R2E, DGS, CTF-OP, .. (see next meetings)BPMs will be installed on girder 10 (end-of-line close to the dump)FYI: was decided to install BPM controls in optical-lab of the gallery (CO will deliver the 2 signals required: 96Mhz RF-clock and synch. Trigger)

3August 29th, 2012CLIC/CLEX controls: Radiation issueHave direct impact on the final architecture

..RAS: daisy chain acceptable?3Safety Engineering and Environment G.Segura-Millan (DGS-SEE-CO) : RAMSES Supervision

4August 29th, 2012CLIC/CLEX controls: Radiation issueHave direct impact on the final architecture

..RAS: daisy chain acceptable?4RAMSES ReportsPMICT401 (clex hall entrance)* ; PMICT402 (start of TBL)* PMICT403 * ; PMICT404* (end of TBL- upstream of dump).

1.0101 SV/hr---------------------------------------30days--------------------------------------------* According to RAMSES mapsDose Rates Highest at End of TBL5August 29th, 2012CLIC/CLEX controls: Radiation issueRadiation meeting reportsM.Brugger first commentsRAMSES results: Low induced activity when beam is off not much activationbut PMI used for prompt measure show high level dose (>10Gy/h, probably underestimated saturation)Impact on the electronics will be dominated by TID (ionizing dose), SEEs will be of secondary importanceRadiation levels seem to increase towards the end of the lineBehind the dump (a bit off-axis) is likely to be a good position for the control electronics -> a simplified dump could easily be put into the FLUKA modelThe rather low energy will make shielding easier, as neutrons are still present lead is perhaps still to be avoided -> iron could be a good choice

S.Mallows last reportSophie did some rough estimate of the particle type energy near the beam-lineDoes not include effects of the concrete walls (likely to affect the neutron fluence)Does not calculate the fluence after the dump (more complicate and will take more time)However what should be pointed out is that radiation from losses from the TBTS may also reach that region New FLUKE Simulation for CLEX is running now and should be presented coming weeksSimulation for CLIC will be done later

6August 29th, 2012CLIC/CLEX controls: Radiation issueHave direct impact on the final architecture

..RAS: daisy chain acceptable?6ConclusionsDue to vacation period and people overload it has been impossible to plan install during this week stop

Everybody should be back on next week .. to do:Retrieve the latest data simulationState on RADMON system (location, type, sensitive range, etc.)State on BPMs electronics shieldingCheck BI and LAPP scheduling (BPMs install, Shielding, TBL tests)Check CLEX scheduling and new stop periods

7August 29th, 2012CLIC/CLEX controls: Radiation issueHave direct impact on the final architecture

..RAS: daisy chain acceptable?7