Survey and Alignment Equipment R2E and Availability Workshop – CERN Mateusz Sosin EN/MEF-SU

Outline RUN 2 – R&D for new systems LS 2 – planned activities RUN 3 – preparation to HL-LHC LS 3 – systems implementation for HL-LHC Continuous monitoring and alignment systems – current status Future campaigns and development Introduction Systems architecture Equipment types and installation zones according to radiation levels Constraints Reliability of installations

Introduction LHC inner triplet monitoring and alignment Positioning of one inner triplet w.r.t the other: ± 0.1 mm Stability of the positioning of one quadrupole inside its triplet: a few microns Wire Position Sensor Hydrostatic Levelling Sensor

Introduction LHC inner triplet monitoring and alignment Monitoring of the load on the supporting jacks Additional safety installation Controls the quality of contact of cryostats vertical supports

Introduction Interconnection alarm system Simple alarm system to detect magnets interconnection shifts Installed basing on the LEP vertical deformation observations (Jin Fengxiahn) Implemented in geologically critical zones of almost all sectors between Q8R … Q8L A.Marin, “LES SYSTÈMES D’ALERTE”

Systems architecture LHC inner triplet monitoring and alignment Control system based on FESA and UNICOS Data acquisition using WorldFip network (31.25 kHz, 2 networks per IP) 1Hz acquisition cycle Amounts of equipment per IP: 6 (8) DAQ FIP agents (x32 AI channels) 2 FIP motor controller agents 32 actuators, 20 WPS, 25 HLS, 20 LOAD, 12(P1, P5) DOMS, 20 PT100 Interconnection alarm system SCADA (Survey UNICOS ) Control system based on FESA and UNICOS Data acquisition using WorldFip network (31.25 kHz) 1Hz acquisition cycle Installed in 6 sectors: 1-2, 2-3, 3-4, 5-6, 7-8, FEC, 12 FIP networks, 97 FIP agents, 377 interconnections

Equipment types and installation zones High radiation zones – passive components only Protected areas (considered as safe) Stepper motor controllers, Survey Acquisition System, Load Sensor Acquisition System, temperature conditioners IP1: US15 IP2: UA23, UA27 IP8: UA83, UA87 IP5: UL55 (before LS1 UJ56) LHC inner triplet monitoring and alignment Inner triplets: IP1: RB14/16 (large gradients and dose variations, 1 – 10kGy/y) IP5: R54/56 (as for P1) IP2: RB26/26 (levels certainly lower than IP1/5) IP8: RB84/86 (as for P2) Low radiation zones Capacitive sensors conditioners (+ sensors P1, P5): IP1: UPS14/16 (low HEH, dose NIL), Bedplates IP5: UPS54/56 (low HEH, dose NIL), YB0 IP2: corners of UL24/26 (behind movable walls, expected low, depends of shielding effect.) IP8: corners of UL84/86 (as for P2)

Equipment types and installation zones Interconnection alarm system AGENT Alstom CC131 Most of 97 FIP agents installed in the ARC’s Max RUN-3 prognosis 1E+09HEH, 2Gy/y Validated up to TID 200Gy CC131 FIP board used

Maintenance constraints Safe access to the inner triplets areas CRYO „mouse trap” zone: Only one escape route. Helium spill may block personnel Access possible only without helium in the triplet Emptying/Filling the triplet takes available time during technical stops and reduces possible maintenance period High radiation zones (especially in P1, P5) Possibility of access will be more and more limited (even impossible) Radiation cooling time may be bigger than available technical stop interval

Sensor Signal conditioner Cable Measurement system constraints Micrometric capacitive measurements High radiation zones Limited access Protected areas (considered as safe) Low radiation zones Micrometric precision capacitive sensors To reach required precisions – calibration of whole measurement set (sensor + cable + conditioner) is needed Failure of one of components force to exchange whole measurement chain Sensors and cables are very fragile (eg. dust, humidity, connectors oxidation) – preventive diagnostic is needed to verify if measured value is correct Cable length can not be bigger than 30m

Reliablility aspects LHC inner triplet monitoring and alignment GOAL: To provide safe triplets position monitoring and alignment, without accessing the area Identification of typical system failures and possible preventive solutions, considering main constriants (triplet area, examples) Fault of sensor/cable/conditioner Repair and recalibration impossible – access constriant Reliable and well tested components needed To implement redundancy Fault of actuators Reliable and well tested components needed Possible sensor/cable/conditioner characteristic change, signal drift Preventive diagnostic of measurements system quality – as access is impossible – remote diagnostic system needed Reference wire break To detect incident – sensors may show „looking well” values even if wire is broken...

Reliablility aspects LHC inner triplet monitoring and alignment Preparatory actions taken before/during RUN-1 Validation of WPS, HLS and PT100 sensors and their analog conditioning electronics according to radiation Validation of carbon-peek reference wire Actuators were designed to be rad-hard Validation of Survey Acquisition System chassis (begin of RUN-1) Validation of Load SensorAcquisition System chassis and sensors (end of RUN-1) Availability observations during RUN-1 The triplet monitoring system availability (during machine run) was bigger than 99% Measurements stops were caused mainly by independent conditions as eg. power breaks Observed some single sensors values changes – validation (and repair) on site was needed (technical stops) Several faults of DAQ (SAS) and motor control electronics were repaired (technical stops) No effect of radiation could be directly correlated to electronics (or sensors) failures

Actions taken – LS1 To provide possibility of preventive diagnostic of inner triplets measurement networks – the remote diagnostic systems were installed: Filling Purging System – motorized tank connected to the HLS network, allowing remote variation of networks water level was installed Wire Displacer System – allowing remote position change of reference wires was installed Wire Break Sensors – detecting broken reference wire Finished installation of load sensors Preventive inspection of actuators was performed Reliablility aspects LHC inner triplet monitoring and alignment Additional actions – long term supply of system components Sufficient amount of electronic spare parts stored (FIP cards, SAS, LSAS, Interconnections) Mechanical components spares stored Minimum amount of spare sensors (approx. 5%)

Reliablility aspects Next 10 years of LHC run Maintenance of accessible components and electronics Development of new solutions providing redundancy of measurements Global R&D for new systems including radiation tests of passive components and electronics Preparation to HL-LHC

Future campaigns and development RUN-2 and beyond Preparation to HL-LHC R&D for new triplets cold mass position monitoring Preparation to exchange the triplets supporting jacks and actuators Precise rad-hard inclinometer R&D (redundancy of measurements) Global R&D for new systems Precise rad-hard inclinometer R&D (redundancy of measurements) New conditioners for capacitive sensors + acquisition electronics R&D on replacing reference wire by laser R&D on new interconnection alarm system (?) Long Shutdown 2 preparation Mobile test bench for sensors calibration Longitudinal triplets cryostats position monitoring system (?)

Future campaigns and development Long Shutdown 2 On-site calibration of micrometric sensors (ageing and TID effect) Sensors cables change Verification of actuators condition, needed repairs, oil change Investigate (possible test measurements needed on site) in extension of measurement network up to Q5 – to include the LSS with the triplet measurement network (LS3) Longitudal triplets cryostats position monitoring (?) New interconnection alarm system (?)

Future campaigns and development RUN-3 Continue preparation to HL-LHC Finalize all R&D for HL-LHC Procurement of new systems and components Reception tests Long Shutdown 3 Implementation phase Installation of new triplets Relocation of electronics from UPS (P1,5) galleries and UL’s (P2,8) corners if needed Installation of new systems

Summary Increase the monitoring systems reliability + new features New developments needed New mechnical systems in high radiation areas Upgrade of electronics and sensors (triplet monitoring + interconnections) Integration of new measurement systems Needs Materials and mechanical parts tests New electronics and its radiation tests (CHARM?) Possible participation in project of universal, rad-hard interface electronics Budget