Download presentation
Presentation is loading. Please wait.
Published bySharyl Griffin Modified over 6 years ago
2
On-line pressure monitoring of Shape Memory Alloy - based vacuum set-ups under irradiation (TDC2)
EATM, 17th October 2017 F. Niccoli Outline Introduction The concept and operation principle of a Shape Memory Alloy (SMA) connector Possible applications of SMA connectors Preliminary irradiation tests of SMA connectors New irradiation tests in TDC2 (north area) : aim, description and tests requirements
3
Introduction: the need of remote operations at CERN
Radiation doses in some critical areas of HL-LHC, will increase by a factor of 16 in the next 20 years of operation. Radiation doses in some critical areas of FCC are expected to be up to two order of magnitude higher than HL-LHC (Besana et al., 2016) M.I. Besana, F. Cerutti, A. Ferrari, W. Riegler, and V. Vlachoudis. “Evaluation of the radiation field in the future circular collider detector”, CERN Report, 2016. CMS CERN
4
Concept of SMA connectors for UHV applications
Current system New concept Typical ConFlat flange Proof of concept of SMA connectors for Ultra High Vacuum (UHV) chambers. Material properties: NiTi based alloys Magnetic permeability < 1.002 Thermal outgassing: < mbar.l.s-1.cm-2 Radiation hard ?? (tests ongoing)
5
Operation principle of a SMA connector
Mounting at room temperature Tightening by heating above 100 °C Leak Rate < mbar·l·s-1 at room temperature Dismounting by cooling down to -40°C T<As (40 °C) T>Af (>100 °C) T = RT T<Mf (-40 °C) pmax pop SMA ring Tube Mounting Clamping Operation Dismounting As: Austenite start temperature Af: Austenite finish temperature Ms: Martensite start temperature Mf: Martensite finish temperature
6
Advantages and potential applications
A compact, leak tight and easily mountable\dismountable connection system Possibility of remote controlling Possibility to use in high demanding areas (e.g. collimator areas, machine/detector interface) Possibility to use in limited access spaces Possibility to connect dissimilar materials HL-LHC Machine Detector interface CLIC main linac CLIC module installed in CLEX
7
Radiation tests at CHARM
Preliminary Irradiation of SMA-based prototype vacuum chambers Radiation tests at CHARM Simulations by FLUKA Dose (Gy/POT) maps in (a) the SMA-based chambers Dose map in the IT area right side of ATLAS for HL-LHC operation Sample placement at CHARM facility The predicted integrated dose absorbed by a SMA connector after a year of possible operation (HL-LHC) in proximity of the inner triplets areas is about 100 kGy; Integrated dose absorbed by SMA ring after exposure at CHARM: ≈ 120 kGy
8
Prototype SMA-based vacuum chambers for irradiation tests
Preliminary Irradiation of SMA-based prototype vacuum chambers Particles spectra Prototype SMA-based vacuum chambers for irradiation tests Particles Lethargy Energy with Cu target in correspondence of the SMA position.
9
Preliminary tests @CHARM: Post irradiation results
Functional behavior not significantly affected by the irradiation (up to 120kGy). Leak tests Dismounting Leak Rate < mbar l s-1 T<-40 °C (NiTi)
10
Preliminary irradiation tests in TDC2 (TCSC.220436) :
Off-line pressure monitoring of a SMA-based vacuum set-up Expected dose ≈ 200 kGy/year Set-up placed/removed by Robot intervention (EN-STI) Vacuum Set-up (Vacuum chambers + pre-activated NEG strips, Penning gauge, SVT gauge, SMA connector with RPL dosimeters)
11
Preliminary irradiation tests in TDC2 (TCSC.220436) :
Off-line pressure monitoring of a SMA-based vacuum set-up Preliminary TDC2 long term irradiation test results Date Action Pressure Penning SVT Dose (RPLs) Placement in TDC2 ~3E-10 mbar ~2E-10 mbar 1st control measurement ~3E-8 mbar ~2.5E-8 mbar ~24 kGy 2 nd control measurement High pressure (higher than E-4 mbar) High pressure interlock ~52 Measurements performed at a distance from high radiation area (in TA801) Equivalent dose rate < 5 mSv/h Cables connection with fast intervention ! (1 minute )
12
Preliminary irradiation tests in TDC2 (TCSC.220436) :
Off-line pressure monitoring of a SMA-based vacuum set-up Pressure increase compatible with Argon outgassing (Noble gases not pumped by the NEG) Preliminary TDC2 long term irradiation test results Date Action Pressure Penning SVT Dose (RPLs) Placement in TDC2 ~3E-10 mbar ~2E-10 mbar 1st control measurement ~3E-8 mbar ~2.5E-8 mbar ~24 kGy 2 nd control measurement High pressure (higher than E-4mbar) High pressure interlock ~52 Cables connection with fast intervention ! (1 minute ) Measurements performed at a distance from high radiation area (in TA801) Equivalent dose rate < 5 mSv/h Pressure increase due to possible NEG saturation! Need of a pumping system with high pumping speed and large capacity for future tests!
13
New irradiation tests on SMA Set-ups in TDC2 (TCSC.220436):
On-line pressure monitoring and continuous pumping Installation foreseen during YETS 2017/2018 Duration of the test ≈ 1 year (until the beginning of LS2) Expected absorbed dose: ≈200 kGy/y 4 set-ups Passive Penning (on-line measurements) Passive Pirani (on-line measurements) Strain gauges + RPL dosimeters (Off-line measurement far from the radiation area) ≈ 300 mm Connection interface box for robot operation (cable plugging/unplugging) NexTorr pump (Ion pump + NEG) SMA ring ≈ 500 mm ≈ 200 mm Large pumping speed and capacity (No noble gases and CH4) Continuous pumping (also Ar, CH4)
14
New irradiation tests on SMA Set-ups in TDC2 (TCSC.220436):
On-line pressure monitoring and continuous pumping Cable length 200 m+ 180m Control (Existing rack in BA80) Irradiation position (close to the nearest BLM, under TCS C)
15
New irradiation tests on SMA Set-ups in TDC2 (TCSC.220436):
On-line pressure monitoring and continuous pumping Requirements 1 Cables DIC to be prepared + 2x patch panels Pennings 4 X TFAR3 (radiation tolerant) HV LEMO Male ~200m RAL003 (Patch panel location) -> TCS C 4 X TFA3 ~180m RAL003 -> Surface (BA80) Pirani 4 X NGR4 (radiation tolerant) Burndy 4 Male RAL003 -> TCS C 4 X NG4 NexTorr 4 X SVAR3 (radiation tolerant) HV Fischer 4 X SVA3 Requirements for 4 set-ups! Set ups will be equipped with interface box for robot operation (connection/disconnection)
16
New irradiation tests on SMA Set-ups in TDC2 (TCSC.220436):
On-line pressure monitoring and continuous pumping Requirements 2 Controls Hardware to be placed in an existing rack in BA80 Pennings & Pirani 2 xTPG300 4 x Pirani/Penning E-11mbar cards 2x Profibus card NexTorr 1 X 4UHV Agilent controller/power supply [2.6kCHF] (Additional pressure measurement) PLC Existing Master PLC (no cost) Controls Software (update VAC DB, PLC, SCADA) SCADA (online monitoring and DB logging) Penning & Pirani & Agilent ctrl existing framework Requirements for 4 set-ups!
17
New irradiation tests on SMA Set-ups in TDC2 (TCSC.220436):
On-line pressure monitoring and continuous pumping Passive Pirani Other points Strain Gauges measurements (connection to the DAQ and readout by means of proper fast connectors/interfaces) will be performed ≈ 3 times in a year. The set-ups have to be transported by robots to the access doors of TA801. Set-ups handling/transportation for strain gauges and/or dosimetry (RPLs) measurements have to be discussed with RP and EN/STI. Interventions have to be planned in advance. EN/STI (Mario Di Castro) needs to be consulted for the interface box design and training of the robots (cables connection/disconnection) Passive Penning Strain gauges + RPL dosimeters (Off-line measurement far from the radiation area) Connection interface box for robot operation (cable plugging/unplugging) Nextorr Pump SMA ring
18
Thanks for your attention!
Special thanks for suggestions/inputs from: Pawel Krakowski (TE-VSC-ICM), Cedric Garion (TE-VSC-DLM), Paolo Chiggiato (TE-VSC) Niccoli F., Garion C., Maletta C., Sgambitterra E., Furgiuele F. and Chiggiato P., “Beam-pipe coupling in particle accelerators by shape memory alloy rings”, Materials and Design, 2017, Vol. 114, pp. 603–611. Niccoli F., Garion C., Maletta C., and Chiggiato P., “Shape memory alloy-based pipe couplers for ultra-high vacuum applications in particle accelerators: design and experimental assessment”, Journal of Vacuum Science and Technology A, 2017, Vol. 35 (3). REFERENCES (only about NiTiNb connectors):
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.