08.09.2011 Status of HRMT23 Activities F. Carra, E. Berthomé, G. Gobbi HL-LHC Collimators: Design, Engineering and Prototyping Meeting 1 December, 2016

Opening of the Test Bench HRMT23 was stored in b. 954, sealed RP measurements at contact with the test bench showed acceptable values (dose rate 80 mSv/h at contact with the downstream flange) However, impossible to exclude a priori a contamination risk  agreement with A. Hervé, K. Weiss to perform the opening at b. 867-R-P58 (EN/STI bunker, with closable roof). Space created pushing aside HRMT28 test bench Light procedure decided (limited availability time of the room, uncertainty on the state of the conditions inside the tank): Opening of the upper plate RP measurements (dose rate at contact with the jaws and contamination) If everything ok, extraction of the three jaws with a crane Dismounting of RF fingers and packaging of the jaws Closing of the tank Estimated duration: 4h30m (conservative), target: keep the collective dose below 100 mSv 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Transport to b. 867-R-P58 Done on Tuesday 8th November 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Tank Opening It took ~3h (13h30 – 16h30) Performed by S. Favre (EN-MME-MA) with support from E. Berthomé. K. Weiss and C. Saury from RP No contamination found. Maximum dose at contact with the jaws, 80 mSv/h. Collective dose for the intervention: ~10 mSv 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Jaws Extraction TCSP Jaw CFC undamaged (some beam trace on the surface, but no external sign of failure) Downstream Glidcop tapering locally melted, with oxidation of the BPM button (sign of high temperature reached) 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Jaws Extraction TCSPM MoGr A scratch provoked by the beam, surface phenomenon (10-20 micron depth?). No sign of failure of MoGr. Both MoGr taperings ok, no trace of high temperature on the BPM buttons 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Jaws Extraction TCSPM CuCD Grooves generated by the higher-intensity beam impacts Local fracture of the bulk material at the block/block contacts Damage can be recovered through the 5th axis Both MoGr taperings ok, no trace of high temperature on the BPM buttons 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Jaws Packaging Jaws inserted into plastic bags and CR code applied on all, then registered in TREC Then placed on a pallet, also registered in TREC as the container of the three items (HCPWPAB001-CR000002) Tank closed, everything re-transported to b. 954 01.12.2016 Federico Carra – EN-MME

Metrology and Electrical Conductivity Measurements Pallet with the three jaws transported to the EN/MME metrology on Tuesday 29th November Temporary radiation-controlled area prepared around the machine 1st Goal: perform the same measurement of flatness done before the test, to look for plastic deformation of the Glidcop support and of the blocks, block/clamp sliding, etc. Pre-test metrology on EDMS: https://edms.cern.ch/document/1520815/1 2nd Goal: map the electrical conductivity of the CFC, MoGr and CuCD, to look for a possible degradation provoked by the test (Sigmatest) 01.12.2016 Federico Carra – EN-MME

Metrology Measurements Analysis of results ongoing https://edms.cern.ch/document/1738755/1 01.12.2016 Federico Carra – EN-MME

Metrology and Electrical Conductivity Measurements Sigmatest measurements on the beam-side surface. Irradiated jaws measured only in the vertical centre of each jaw. Comprehensive mapping after disassembling. Pristine Irradiated Jaw Number of measured points (Frequency) Average value [MS/m] Deviation Average value [MS/m] Change CFC >10 (60kHz) 0.27 0.01 10 (60kHz) 0.31 0.03 +14% MoGr 72 (960kHz) 0.69 (0.692) 0.05 24 (960kHz) 0.69 (0.686) -0.9% CuCD 90 (960kHz) 53.7 9.1 30 (960kHz) 52.4 10.9 -2.4% Highest frequency was used in CuCD in order to measure only the external cladding. In MoGr the values were similar in all frequencies 01.12.2016 Federico Carra – EN-MME

Next Steps G. Gobbi managing the test and activity program Testing of the three jaws Non-destructive tests before disassembling the jaws Metrology Electrical conductivity BPM performance: are they still operative? Cooling circuit pressure test? Before or after disassembling? … ? Disassembling of the jaws (at the metrology?) Non-destructive tests of jaw components (blocks, Glidcop housing, pipes, tapering, etc.). For example, measurement of the groove depth (profilometry?), mapping of electrical conductivity, etc. Target: avoid frequent transports from b. 954 to the testing facilities: maximize the number of tests per activity At a later stage, destructive tests Recovering of instrumentation, table, preparation of RP wastes It may involve machining (for example of the table, for HRMT36 use) Idea is to do it at b. 109, in 2017 Dismounting, machining, sorting of RP wastes: it may be long. Room to be booked for at least 1 week, preferably 2 weeks. To discuss with J. Tonoli, the calendar is very dense G. Gobbi managing the test and activity program 01.12.2016 Federico Carra – EN-MME

Federico Carra – EN-MME Conclusions At this stage, after HRMT23 opening, no change to the preliminary conclusions given at the LMC in August 2015 (failure of Glidcop tapering, survival of MoGr tapering, survival of MoGr and CuCD absorbers to the respective failure scenarios) Lots of test to come to evaluate: BPM survival Glidcop housing plastic deformation Cooling circuit under water pressure Thermo-physical property change of the impact materials Many thanks to the colleagues involved in these operations! (EN/MME, EN/STI, EN/HE, HSE/RP, SMB/SC, EN/EA, BE/ABP, …) 01.12.2016 Federico Carra – EN-MME