Technology and construction of superconducting devices Anna Zaleska - - PowerPoint PPT Presentation

Technology and construction

• f 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.

Gantry

a device - sometimes huge - for rotating a radiotherapy 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 +

C

n 0

γ

e -

Path of beam

Isocentric (a) and exocentric (b) gantry

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

• f cold head valves

10 - frame of gantry 11 - support of frame wheels

Superconducting gantry

Cooling

Obrazek  Cryocooler system with the compressor – cooling magnets to cryogenics temperatures - magnets are not swimming in liquid cooling.

• Ok. 40 ton vs. ok 4 tony

Conventional vs. superconducting

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 Hopes

• more

complicated construction

• price
• smaller sizes
• lightest
• larger magnetic

fields

Fears and hopes towards SuperGuntry

Project of Slovak gantry in Veksler and Baldin Laboratory of High Energy Physics Joint Institute for Nuclear Research

1.Property of superconductors 2.Why we shields the magntic field? 3.Why superconducting shields? 4.Types of superconducting shields 5.Applications 6.Technology

PART TWO Superconducting magneting shields

Property

Maissner effect

Why we shields the magnetic field?

• Malfunctioning of electronical equipment.
• Neurobehavioral changes in behavior.

Limit of safe magnetic field: Bmax: 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 shield 4cm – 4,7t Cost of superconductivity shield: 115 000 $

Unclosed shields

Magnetic field homogeneity ΔB/B: 1e-05

Electron Cooling System (ECS) for NICA

Technology

• Materials (HTS)

– YBCO – BSCCO

• Construction of shields

– tapes – tubes

• 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
• peration 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

References:

Dziękujemy za uwagę! Thank you for attention! Спасибо за внимание! 