VWM

Vibrating Wire Monitor

Beam transverse profile

and position Beam Halo measurement

 

Dynamic range

 

> 1E6

Resolution for

proton beam

3pA

Resolution for

electron beam

70pA

Principle 

The VWM is based on the wire resonant frequency dependence on its tension, itself dependent on its temperature. A positive feedback oscillator excites the wire oscillations at this resonant frequency. Particles penetrating the wire heat it, change its tension and therefore its resonant frequency. Vibrating wire sensors have been applied to electron,  proton, ion and photon beams. VWM can be used for neutron beams too.

VWM system components

  • VWM 1-wire Sensor
  • Twisted pair cable from Sensor to Front-End Electronics
  • Front-End Electronics box, each supports 2 Sensors
  • Front-end to chassis RJ45 cable, up to 50 meters
  • Chassis, can support up to 6 Front-End Electronics

 

 

 

 

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Specifications 

Frequency resolution

<0.01Hz

Thermal resolution per wire material

 

Stainless steel SS

0.3mK

Bronze B

0.6mK

Tungsten W

1.0mK

 

Deposited heat power resolution

  
 

In vacuum

In air

Stainless steel SS

7E-9 W

1E-6 W

Bronze B

5E-8 W

2.6E-6 W

Tungsten W

3E-7 W

5.4E-6 W

Response time

In vacuum

In air

Stainless steel SS

20s

0.23s

Bronze B

 9s

0.21s

Tungsten W

 2s

0.16s

 

Datasheet

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