1. Particle Accelerator Component’s Metrology and Alignment to the Nanometer scale.

2. Background
With new accelerators delivering beams always smaller and more energetic, requirements for very precise beam alignment become more and more challenging.
Either for producing a high number of collisions at the highest energy, or for producing the brightest light from light sources, the tolerance concerning the position of the beam inside an accelerator is becoming increasingly tight.
Goal
To propose and develop a very high accuracy metrology and alignment tools for the Compact Linear Collider (CLIC) components and integrate them in a single automatic test stand.

3. Components Instruments
Quadrupole
Beam Position Monitor (BPM)
Accelerating Structure (AS)
The magnetic center of the quadrupole must be aligned to an accuracy of x nm with respect to….
The electrical centre of the BPM must be aligned to an accuracy of x nm with respect to the beam trajectory.
The electrical centre of the AS must be aligned to an accuracy of 5 μm with respect to the beam trajectory.
Instruments
Frequency Scanning Interferometry (FSI)
Micro-triangulation
Stabilization system and seismometers
Coordinate Measuring Machine (CMM)

4. Test bench
In a current first stage, an individual research of each ESR is being done. During this period, the students could work in teams of Work Package (WP) in the development of the different parts required (seismic sensor, sensor for the CMM, nano-positioning system…) and several initial test benches for each component.
Then, a common test bench will be done where the BPM and quadrupole will be assembled together and aligned with the resolution required using a stretch wire.
The integration of the AS in the final test bench is still under research.
The solution developed within the PACMAN network needs to be robust and also work reliably in an industrial environment.

5. The team WP1 ESR 1.1 ESR 1.2 ESR 1.3 WP2 ESR 2.1 ESR 2.2 WP4 ESR 3.1
Development of an optical sensor to be plugged in the CMM for high precision positioning of objects.
ESR 1.1
ESR 1.2
Development of an absolute portable metrology method based on FSIin order to perform absolute measurements of distance.
ESR 1.3
Micro-triangulation for high accuracy short range measurements of dynamic objects.
WP2
ESR 2.1
ESR 2.2
Development of a magnetic measurement system based on the oscillating wire field-measuring technique for small aperture magnets.
Development of a magnetic measurement system based on rotating coil with printed circuit board technology.
WP4
ESR 3.1
Re-engineering of the quadrupole magnets and BPM support assembly with ultra-high precision for the initial co-alignment at the micrometre level. Full mechanical integration of the prototype alignment bench.
Development of a compact light-weight seismic sensor with a large bandwidth and low noise in order to measure quiet ground motion.
ESR 3.2
ESR 3.3
Upgrading of the first prototype of nano-positioning system to be used for the test setup including actuators for alignment and stabilization.
WP3
ESR 4.1
ESR 4.2
Demonstration of the nanometre resolution of the BMP by using a RF excitation on the stretched wire.
Measurement of the electrical center of the AS using wakefield monitors integrated in the AS.