Wire Scanner

scintillator + photomultiplier

Different wire scanner generation

Problems

• Wires breaking due to beam interaction.

• Instabilities of position and profile measurements due to:Inaccuracy of position measurements.Flexibility, vibrations in mechanics and wire (in some cases).

• Outgassing bellows

• Wire vibrations

Problems

• Wires breaking due to beam interaction.

• Instabilities of position and profile measurements due to:Inaccuracy of position measurements.Flexibility, vibrations in mechanics and wire (in some cases).

• Outgassing bellows

Motor

Motor Specification

•Brushless motor

• Acceleration (from parking position to 200 radians/sec in ¼ turn): 12 800 rads/s²

• Rotor inertia of the shaft and wire stretching fork: < 2.0x10-4 kg.m2

• Inertia of the position transducer: < 1.0x10-4 kg.m2

• Minimum vacuum chamber thickness between stator and rotor: 1.5 mm

• Operating pressure: <10-7 Pa

Inductosyn transducers

Inductosyn transducers

Inductosyn Specification

• points spaced at 384 microradians with a repetabililty of ± 24 microradians(possibility to reduce the repetability to ± 12 microradians with selection of a higer resolution transducer)

• Resist to high temperature ( 260 °C)

• very low outgassing

• number of bits would be between 16 and 19 (520 kHz)

Motor control

Motor control

A1

DAC1

A2

DAC2

A3

DAC3

M

ADC

V+

V-

V+

V-

V+

V-

DSP or µC

or FPGA