Agilent TECHNICAL SPECIFICATIONS FOR A WATER COOLED ACTIVELY SHIELDED GRADIENT SYSTEM WITH RT SHIM SET Guide(1)
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1. PLANE X 0 Figure 1 Theoretical image distortion of a 200mm cube phantom DSV is denoted by the dashed circle Tech Spec TS1490B November 2006 3 SHIM SYSTEM 3 1 Room temperature shims First order shimming is achieved by DC offsets to the gradient coils The nominal shim performances are shown below Shim Strength Inductance Resistance Peak current mG cm A mH Q A shielded Z Bo 348 2 ZX ZY Kx Tech Spec TS1490B November 2006 8 4 1 1 off 4 2 1 off 1 off 1 off 4 3 1 off 1 off 4 SCOPE OF SUPPLY Gradient Actively shielded gradient type SGRAD mk IV 395 290 HD S Standard ancillaries Not included on inserts Set of X Y Z cables standard length 15m C0463150 RT shim cable standard length 15m C0398150 Thermometry cable standard length 15m C0399150 Optional extras Stand alone temperature monitor unit E3515g Gradient management unit consisting of E3500 i Computer controlled X Y and Z pre emphasis ii Computer controlled Zo Bo pre emphasis Tech Spec TS1490B November 20062. NOTICE This document contains references to Varian Please note that Varian Inc is now part of Agilent Technologies For more information go to www agilent com chem aie Agilent Technologies TECHNICAL SPECIFICATIONS FOR A WATER COOLED ACTIVELY SHIELDED GRADIENT SYSTEM WITH RT SHIM SET SGRAD 395 290 HD S Prepared by Magnex Scientific Limited The Magnet Technology Centre 6 Mead Road Oxford Industrial Park Yarnton Oxford OX5 1QU UK 44 0 1865 853800 44 0 1865 842466 sales magnex com magnex com Document Ref TS1490B Date November 2006 CONTENTS Description Mechanical 1 1 Dimensions and weight 1 2 Finish 1 3 Mounting 1 4 Electrical connectors 1 5 Temperature sensors 1 6 Water cooling system Gradient Coils 2 1 Strength 2 2 Linearity 23 Residual eddy currents 2 4 Inductance 2 5 Resistance 2 6 Safe operating conditions and duty cycle 2 7 Peak strength and rise time estimated 2 8 Orthogonality 2 9 Insulation Shim System 3 1 Shim characteristics System Components 4 1 Gradient 4 2 Standard ancillaries 4 3 Optional extras Tech Spec TS1490B November 2006 GENERAL DESCRIPTION The SGRAD 395 290 HD S is a fully self shielded gradient system designed to suit 2400mm room temperature bore superconducting magnets and gradient systems The design incorporates fully optimised X Y and Z coil configurations The X and Y coils are made from the highest quality copper plates machined w
3. ing water chiller 2 GRADIENT COILS 2 1 Strength X Y Z axis 0 33mT m A 5 2 2 Linearity per axis see figure 1 over 200mm DSV X Y lt 5 Z lt 5 Definition Linearity Max spatial deviation as a percentage of the plotting radius 2 3 Residual eddy currents before pre emphasis X Y Z axis lt 1 2 4 Inductance X axis 290uH 15 Y axis 325uH 15 Z axis 285uH 15 2 9 DC Resistance X axis f 130mQ 25mQ Y axiz 150mQ 25mQ Z axis 215mQ 25mQ 2 6 Safe operating conditions Peak voltage lt 500V Peak current lt 300A RMS current lt 100A RMS indefinitely all axes together lt 200A RMS indefinitely Y axis only Peak internal temperature lt 60 C 2 7 Typical peak strength and rise times estimated Peak strength 300A X Y Z 100mT m Rise time 0 98 X 280us 300A 350V Y f 320us Z 300s Measured 5ms after a 20ms trapezoidal pulse and extrapolated to 1ms after the pulse Excluding the effects of lead resistance and filter impedance Tech Spec TS1490B November 2006 5 2 8 Orthogonality X to Y 90 1 2 9 Insulation Between X Y Z shims gt 200 MQ at 1000 Volts DC sensors cooling amp enclosure Tech Spec TS1490B November 2006 wa Sey ral Tees X N J PLANE Z 0 TSS pL
4. ith CNC technology The Z coil is wound from heavy duty copper strip The HD range of gradients have been engineered to allow for high duty cycle experiments The room temperature shim set has been specially designed to minimise coupling between gradients and shims during pulsing Finally the gradient set is fully vacuum impregnated to minimise mechanical vibration and noise Tech Spec TS1490B November 2006 3 1 1 1 2 1 3 1 4 1 5 1 6 1 MECHANICAL Dimensions and weight Total length External diameter Internal diameter Approximate weight Finish Bore tube End plates Mounting Method at access end Method at service end Adjustment Loading Electrical connectors Gradients Temperature sensors RT shims Temperature sensors Type Number on inner section Number of outer section Water cooling system Volumetric flow rate Supply pressure typical Internal pressure drop Heat extraction Gradient connectors Fitting for supply hose Recommended water supply Tech Spec TS1490B November 2006 To suit magnet 395mm 3mm 290mm 0 5mm 250 kg Natural GRP Plated aluminium Flange bolted to magnet OVC O ring clamp 5mm axially Service end only Lemo ERA 6S 304 CLL Lemo FGJ 4B 320 CLA Lemo FGJ 4B 324 CLL Type T thermocouples 4 typical 2 typical 6 6 litres min 4 bar 2 3 bar 4 7 KW for AT 10K and Tinte 10 C Double shut off connector 1 2 ID barbed hose fitting Recirculat
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Agilent TECHNICAL SPECIFICATIONS FOR A WATER COOLED ACTIVELY SHIELDED GRADIENT SYSTEM WITH RT SHIM S