FF 20130325¶

25th March 13:00 in R9 lab

Present:

Roy Preece
Victoria Blackmore
John Palin
Tim Hayler
Andy Nichols
Chris Rogers

To summarise what we discussed today.

Survey coordinates system¶

In general:

In detail:

y-z plane is defined by the least-mean-squares fit of the end flange holes on the downstream face of the outer "pcd" flange (defines x-axis and x=0)
z-axis defined by line between the top hole and the bottom hole (defines y=0)
y-axis is the perpendicular to z-axis in the y-z plane
z=0 is defined by the mean z of left-most and right-most point on the end flange
- Rogers comment: physics software uses right-handed coordinate system so propose we do also; implies while looking towards positive x, positive y is to the left

Request that we have access to raw data and as much information as possible about the data format
- Propose transferring data by memory stick to R9 local data store
- Need to find out number of files/file size/data format
- John also has some proprietary software for extracting the position data - and converting by hand to e.g. excel format

Survey can be either by:

"Absolute Distance Measurement" - ADM
- Use IR device and speed of light in air to measure distance
Interferometry using Helium Neon laser
- wavelength ~0.0158 micron
Survey is to centre back face of the survey point
- e.g. centre of the hole on the object face for pin mounted survey probes

John will be at RAL on 9/10 April to take some data for spectrometer solenoid alignment device - would be nice to have a practical demonstration of the survey device!

Discussion on survey data
- survey uses xit format which appears to be proprietary binary format.
- documentation is in a proprietary (adobe indb) format. Nonetheless we should have access to the files. There was also some discussion on how the MICE hall is/will be surveyed.
Discussion of survey details

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