Beam transverse profile
and position Beam Halo measurement
Dynamic range
> 1E6 | Resolution for proton beam 3pA | Resolution for electron beam 70pA |
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
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 |
