HLS going mobile - Stanford University• Realised in LabView • DAQ Oriented • Hardware...

HLS going mobileDevelopment and test of a mobile HLS system

14th International Conference on Accelerator AlignmentESRF Grenoble 3 -7 October 2016

P. Bestmann CERN

Outlook

04/10/2016

• Scope & motivation

• mHLS strategy

• Sensor setup

• First tests

14th International Conference on Accelerator Alignment

Scope & motivation

• Why making a Hydrostatic Levelling System mobile?

• We loose the advantages in terms of precision!

• We keep all the advantages in terms of automation!

• Vertical measurements of the Collimator Survey Train were derived from wire sag models.• This is only possible in very limited dimensions and configurations.

• Control of environment and wire parameters.

• Preparations for a Train Version 2• More flexible solution for wire offset measurements (see talk A. Behrens)

• Alternative solution for vertical measurements.

04/10/2016 14th International Conference on Accelerator Alignment

mHLS strategy

• Available Sensors• Capacitive sensors

• Floater or needle based sensors

• Ultrasonic sensors

• Ultrasonic Sensors already emerged in water• Developed and produced by DESY

• Very good for a mobile application

• Smart self calibrating strategy using silica glass references

• Limited in range, extension is difficult

• We need sensors with 250mm range

04/10/2016 14th International Conference on Accelerator Alignment

mHLS strategy• Combination of different systems

• Giving 250mm range

• Keeping HLS sensor range reasonable small

• Minimizing systematic errors

• Lightweight linear translation stage

• Absolute optical scale

• Composite pot for DESY HLS sensors

• Fully filled 10mm diam. Tube

• Free air system

04/10/2016 14th International Conference on Accelerator Alignment

mHLS Sensor

04/10/2016

Support

ReferencePiece

Optical ScaleRead-head

Composite pot

Transducer

R1R2

WS

D1

D2

D3

𝐻𝐻 = 𝐷𝐷2 − 𝐷𝐷1𝑊𝑊𝑆𝑆 − 𝑅𝑅1𝑅𝑅2 − 𝑅𝑅1

14th International Conference on Accelerator Alignment

mHLS Sensor

04/10/2016

Standard socket

Optical scale

Translation stage

HLS pot

• Base, table, scale and reference piece is one assembly

• Changing transducer or pot does not affect system constants

Motor & Driver

Scale readhead

14th International Conference on Accelerator Alignment

• Rack for electronics• DESY MPE2 Unit

• PXI + touchscreen

• Power supplies + UPS unit

• Batteries

• 2 x 18m Tubes

• Pinch Valve

Infrastructure

04/10/2016 14th International Conference on Accelerator Alignment

• Automatic sequence• Adjust theoretical height difference using stage

• Open valve

• Monitor stabilisation process

• Measurement process

• Verification process

Operation

04/10/2016 14th International Conference on Accelerator Alignment

Software

• Realised in LabView• DAQ Oriented

• Hardware integration

• High level functionalities and controls

• Modular architecture• Object oriented

• Using Actor Framework

• Automatic processing• Aquisition

• Statistics & Controls

• Documentation

04/10/2016 14th International Conference on Accelerator Alignment

Laboratory Tests

• Lab tests are showing results as expected

• System is stable in Lab environment

04/10/2016 14th International Conference on Accelerator Alignment

Tests

• What about real conditions?• Temperature differences

• Ventilations issues

• Pressure differences

• Stabilisation issues

• Transport

• Handling

• Measurement time

• Autonomy

04/10/2016 14th International Conference on Accelerator Alignment

LHC Tests

04/10/2016 14th International Conference on Accelerator Alignment

LHC Tests

• Adress practical issues• Transport

• Handling

• Autonomy

• Stabilisation

• Time

• Stability• Zero Offset

• Statistics

04/10/2016 14th International Conference on Accelerator Alignment

Zero Offset

04/10/2016

Average 1.179mmRMS 0.045mmMin 1.103mmMax 1.293mmRange 0.190mm

14th International Conference on Accelerator Alignment

Repeatability

04/10/2016

Average 0.003 mmRMS 0.003 mmMin 0.000 mmMax 0.019 mmRange 0.019 mm

14th International Conference on Accelerator Alignment

Next steps

• Improvements of cable & tube protection

• Differential pressure measurements inside the pots• Shield

• Membrane

• Airtube

• Temperature effects due to the huge water column• The temperature in the LHC is rather stable

• Temperature differences between the two tubes are very small

• Automation tests with robotic arm

04/10/2016 14th International Conference on Accelerator Alignment

The full content of this presentation would not have been possible without the valued

contributions of all those involved

Thank You