Technology and construction of superconducting devices Anna Zaleska Jan Murdzek Supervisor – Henryk Malinowski PhD Veksler and Baldin Laboratory of High Energy Physics Joint Institute for Nuclear Research Summer Student Practice in JINR Fields of Research 2014
PART ONE Superconducting devices in medicine – Super Gantry PART TWO Superconducting magneting shields
PART ONE Superconducting devices in medicine Super Gantry 1. Superconductivity 2. Why we need SuperGantry? 3. Superconducting Gantry 4. Cooling 5. Conventional vs. superconducting guntry 6. Fears and hopes towards SuperGuntry
Supercondactivity Superconductors are materials, which have the zero resistance at properly low temperature and special parameters, for example Meissner effect.
a device - sometimes huge - for rotating a radiotherapy Gantry beam and delivery apparatus her around the patient , to treat a cancer from different angles.
Why we need SuperGantry? To destruction of the cancer cells by the radiation. p + γ e - C n 0
Path of beam
Gantry Isocentric (a) and exocentric (b) gantry
Superconducting gantry 1, 2, 3 - dipole magnets 4 - focusing magnet 5 - scanning magnet 6 - sealing of helium tubes 7 - sealing of vacuum tube 8 - electric sliding connection 9 - electric sliding connection of cold head valves 10 - frame of gantry 11 - support of frame wheels
Cryocooler system with the compressor – cooling magnets Cooling to cryogenics temperatures - magnets are not swimming in liquid cooling. Obrazek
Conventional vs. superconducting Ok. 40 ton vs. ok 4 tony Parametr Conventional Superconducting weight about 400 tons about 200 tons length about 15 meters about 10 meters radius about 7 meters about 5 meters magnatic field about 1,5 T about 3 T
Fears and hopes towards SuperGuntry Fears Hopes • more • smaller sizes complicated • lightest construction • larger magnetic • price fields
Project of Slovak gantry in Veksler and Baldin Laboratory of High Energy Physics Joint Institute for Nuclear Research
PART TWO Superconducting magneting shields 1.Property of superconductors 2.Why we shields the magntic field? 3.Why superconducting shields? 4.Types of superconducting shields 5.Applications 6.Technology
Property Maissner effect
Why we shields the magnetic field? • Malfunctioning of electronical equipment. • Neurobehavioral changes in behavior. Limit of safe magnetic field: B max : 0,08mT for 50Hz 3mT for 0-0,5Hz
Why superconducting shields?
Why superconducting shields? Mass of whole shiend for Gantri (7,5m): 20t
Why superconducting shields? Mass of whole shield for Gantri: shield 7cm – 8,5t Cost of superconductivity shield: 115 000 $ shield 4cm – 4,7t
Unclosed shields Magnetic field homogeneity Δ B/B: 1e-05
Electron Cooling System (ECS) for NICA
Technology • Materials (HTS) – YBCO – BSCCO • Construction of shields – tapes – tubes
References: • Rotating Gantry for HIMAC Facility, Koji Noda; 2ndWorkshop on Hadron Therapy of Cancer, Erice; May, 2011 • THE HEAVY ION GANTRY OF THE HICAT FACILITY ; R. Fuchs, U. Weinrich, P. Emde; EPAC 2004 • Design of a superconducting rotating gantry for heavy-ion therapy ; Y. Iwata, K. Noda, T. Shirai, T. Murakami, T. Furukawa, S. Mori, T. Fujita, A. Itano, K. Shouda, and K. Mizushima; Physical Review Special Topics - Accelerators and beams 15, 044701 (2012) • Exposure to static magnetic field and health hazards during the operation of magnetic resonance scanners - Jolanta Karpowicz , Krzysztof Gryz, Piotr Politański , Marek Zmyślony ; Medycyna Pracy 2011;62(3):309 – 321 • Mathematical simulation of the unclosed 2-G HTS shield ; Evgeny Kulikov, Gennady Dorofeev, Valery Drobin, Henryk Malinovski, Alexander Smirnov, Grigory Trubnikov; poster • Investigations on superconducting magnetic shields based on YBCO and BSCCO ; Łukasz Tomków; Wrocław 2013 • Dz.U.03.192.1883
Dziękujemy za uwagę! Thank you for attention! Спасибо за внимание !
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