University of Huddersfield Centre for Precision Technologies HILHCUK

University of Huddersfield Centre for Precision Technologies HI-LHC-UK, WP 1, Task 2 STFC/CERN/Uo. H Design and integration of an active dynamic compensation for the collimator jaw in the Multimat experiment Thomas Furness / Simon Fletcher 1

Context: Adaptive Collimation System (ACS) • Aim: to dynamically correct distortions in the collimator jaws, caused by inoperation events, namely thermal deformation. • Travel: ± 100µm in varying shapes • ACS to be incorporated upon TCSPM collimator design currently being tested here at CERN. • ACS consists of two areas of interest: ACS Actuation Measurement 2

ACS Measurement - SPM • Preliminary Sensor – slotted photo-mircosensor (SPM) • Attributes: – – High resolution (21 nm) Low cost Custom in CPT design High success rate with other projects. • Cons: – Not designed to withstand out gassing temperatures. – Increases installation difficulty – SPM susceptible to radiation damage. 3

ACS Measurement – DRI • Current Measurement Solution: DRI (Dispersed Reference Interferometry) Strain measurement 4

ACS Measurement - DRI • Current Measurement Solution: DRI Strain measurement – Attributes: Easy to install Versatile Fibres design to withstand high temperatures. Major components located outside of vacuum tank • Absolute measurement system • • – Cons: • Higher start up cost • Fibres susceptible to spectral absorption (darkening). • Bonding Issues 5

ACS Actuation • Potential actuation solutions: – Metal ceramic patches • Cheap, low risk, small power requirements • However, Long rise times. – Piezo Actuators High force generation Multiple options in the market. Extremely fast rise times. Displacement is inversely correlated to force generation. • Critical damage induced though high temps, over preloading, excess voltage, shock loading. • Require high voltages • • 6

ACS Actuation • Rise times Piezo Rise Times 0. 000000 0. 200000 0. 400000 0. 600000 Thermal Actuation Rise Times 0. 800000 1. 000000 1. 200000 180 -20. 000000 160 -40. 000000 140 -60. 000000 120 -80. 000000 100 -100. 000000 80 -120. 000000 60 -140. 000000 40 -160. 000000 20 -180. 000000 0 Disp Rise Time 0. 000072 [µm] Disp rise Time 0. 00072 [µm] Disp Rise Time 0. 0072 [µm] Disp rise Temp 0. 072 [µm] 0 5 Maximum Disp at 300 c [µm] 10 15 Maximum Disp at 400 c[µm] 20 25 Maximum Disp at 250 c [µm] Disp Rise Time 0. 72 [µm] 7

Multi-Mat @ CERN • What is Multi-Mat? – – – Material testing experiment 16 Stations for material samples To be assembled summer 2017 Installed into Hi. Rad. Mat In SPS At CERN Tested end of year 2017 Uo. H have been given 1 dedicated station for equipment testing 8

Multi-Mat Adaptive Collimation System V 3 (MMACS) • MMACS will allow us to test the measurement/actuation when in close proximity to the beam. Test Station 2 Beam Direction Test Piece Clamps Test Station 1 9

Multi-Mat Adaptive Collimation System (MMACS) Piezo Actuator Housing Fibre Tracks Beam Direction offset form centre of test 10

Multi-Mat Adaptive Collimation System (MMACS) Around 50 -60µm Piezo to induce reversing force Offset beam to induce thermal distortion 300 N Piezo force Direction Of movement 11

Multi-Mat Adaptive Collimation System (MMACS) What Next? • In depth beam simulations of Multi-Mat test rig. • Manufacture start in UK simulation pending • Drawings to be released end of Feb • Manufacture and assembly to be Completed mid April • ¼ size (NOT ¼ scale) model of collimator jaw to test actuation and measurement in full – design in progress • Start designs and simulations for final collimator design. 12

Centre for Precision Technologies Thank you Tom Furness, Simon Fletcher, Andrew Longstaff Email: t. furness@hud. ac. uk/thomas. furness@cern. ch