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T2K 280

Magnet

MOVING SYSTEM

ELECTRICAL CIRCUIT

COOLING CIRCUIT

CONTROL & SAFETY SYSTEM

YOKE

COILS

corrado.gargiulo@roma1.infn.it

tel+390649914256

C.Gargiulo

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Part to be replaced or rebuiltPart to be replaced or rebuilt

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MAGNET MOVINGMAGNET MOVINGSYSTEM

Components and parameters

RAILS

MAGNET SUPPORT STRUCTURE

THRU

ST

FOR

CE

DAMPERSHORIZONTAL

ANDVERTICALMOVINGDEVICE

Leadsrews

Gear motorPosition precision (working position)

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Re-use of the existing carriage support beam structure from UA1 experiment

Finalloads of Side MRD, ECAL andhave to be known to verify the structure .One additional motor support to the structure has to be fixed if the solution ofone single gear motorper

half magnet will be adopted for the moving system

Present weight of each carriage is about 11tons

The support structure is the only part of the MMS of UA1/Nomad available

MAGNET MOVINGMAGNET MOVINGSYSTEM

Magnet Support Structure: ITEM 3

The Magnet Support Structure has two basic functions:

2) Carry the weight of magnet and Ecal

3) Act as interface between the moving system and

the load

Structure should also withstand horizontal forces which occur during acceleration andbraking phase of moving periods

The stability of the system should also be considered since the center of mass of the

magnet is relatively high.

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MAGNET MOVINGMAGNET MOVINGSYSTEM

Horizontal moving devices

ITEM 9rollers

ITEM 8dampers

ITEM 4rails

ITEM 7foot

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MAGNET MOVEMENTMAGNET MOVEMENTSYSTEM

Rails ITEM 4

Rails versus fundation:

Rails have to be mounted on top of a steel plate and a layer of special fluid concrete

in order to distribute the load uniformely to the foundation.

Rails versus Moving System:

The straightness and parallelism deviations can be compensated with alignment

screw and a movable levelling device on each side of the rail.

The alignmentof the rails over the distance of the UA1 magnet displacement should

be well within the specifications. Rollersare very sensitive for height variations.

No rails is available from Nomad

T2k -280m 09 03

2005

DIMENSION SCHEME

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MAGNET MOVEMENTMAGNET MOVEMENTSYSTEM

Rails ITEM 4

Rails versus Moving System:

The rails will be in sections alligned and

assembled toghether

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Rails and hydraulic jacks footprint

PREL

IMINAR

Y

400

1100

Dimensions in mm

4500

2500

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Rollers are one of the smallest heavy transport devices with the highest carrying capacity available.

They consist of a frame fabricated from high alloy steeel and a chain of cylindrical steel rolls

Their solid construction enables wide range of application for many conditions and long product life

with minimum maintanace

No horizontal moving devices is available from Nomad

Proposed Design: n. 8 Roller Skates for each yoke halves (assumed 500T per halves)

Roller Model V AS-H-50CrV4 (roller 50CrV4)

number of rollers: 17

number of rollers under stress: 6

Maximum load: 85 T

Weight: 93 kg

Guiding rolls installed against rails

MAGNET MOVINGMAGNET MOVINGSYSTEM

Horizontal moving device ITEM 9 Roller

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MAGNET MOVINGMAGNET MOVINGSYSTEM

dampers ITEM 8

No horizontal moving devices is available from Nomad

Proposed suspension system is based on spring disk.

Foreseen 4 spring units for each roller. A spherical connection to the carriage ensures

an uniform loading for each spring disk.

Rollers are sensitive to alignment errors inrail. Based on that there has to be elasticity

between the roller and support structure to

compensate the errors.

T2k -280m 09 03

2005

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MAGNET :MAGNET :

Vertical moving device ITEM 10

Hydraulic jacksEnerpac

Hydraulic jacks

The hydraulic jacks between the

carriage and the cavern floor. Thewhole structure could be finally

supported by twelve jacks

n.12 100-tons hydraulic cylinders

for each magnet half

Design under development

-Pit reinforced not only under the rails but also

under the jacks

-modification to the Magnet foot

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MAGNET MOVINGMAGNET MOVINGSYSTEM

Vertical moving device ITEM 11 Hydraulic jacks

The hydraulic jacks are between the carriage and the cavern floor. The whole structure is finallysupported by six jacks

n.12 100-tons hydraulic cylinders for each magnet half

Contact area of the piston head is 198cm2. To distribute this rather high surface pressure of the

head to concrete , a steel plate should be embedded on contact area against concrete floor.

The clinder piston has a spherical head that compensate alignment errors in contact surface of the

order of +/-2

The cylinder are equipped with locking nut devices that keep the device in

the correct position in case of pressure drop

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CLL-106

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CLL-106

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Hydraulic Jack related required components:

Standard electrical pump with capacity of 40 liters and pressure of 700bars

Minimum required pump capacity Vmin= Number of jacks per jacks oil capacity

=20 l+50%(piping)

Minimum continuos working pressure Pmin= Magnet half load/(6xPiston Surface Area)

=415 bar+40%bar (speed)

Control Unit for each half magnet

Distribution line to jacks

Height measuring device at each jack

Enerpac produces this kind of component:

Syncronous lift system SLS 16B or SLS 16P 61

MAGNET MOVINGMAGNET MOVINGSYSTEM

Vertical moving device control

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one single gear motor

by mean of two shafts drives the two lead screws

-shaft

-lead screw

-lead screw head fixation

-motor support

Gear motor

shaft

shaft

Lead screw

MAGNET MOVINGMAGNET MOVINGSYSTEM

Gear motor dimension

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In the Nomad experiment each screw is driven by an individual motor which mean that two motors

are required to move one magnet half.

The experiences of this system among users are negative.

Problem in the control of the sincronization between the two motors resulted in time consuming

manual control .

A solution that foreseen one single gear motor that, by mean of two shafts, drive the two leadscrews, is being investigated

MAGNET MOVINGMAGNET MOVINGSYSTEM

Gear motor dimension ITEM 12-13-14-25

Motor OVERALL parameters determination:

Weight of one magnet half m500000 kg

Rolling coefficient for the rollers rollers=0.03

Lead screw efficency screw =0.2gear efficency gear =0.9

screw advancing per revolution d=48mm/23revolutions=2.09mm/rev

required magnet displacement speed v=100mm/min=0.0017m/s

Required gear output speed n=v/d=100/2.09 48rpm

Required movig force F= rollers x m x g=500000x0.03x9.81= 147150N

Required power P= (F x v)/ =147150x0.0017/(0.2x0.9)=1.39kWRequired torque M= Px9550/n=1.39x9550/48=277Nm