Survey and alignment. The nominal magnetic axis of the magnets will be aligned at Daresbury Laboratory by reference to fixed points on the supplied structure. The magnetic axis will be related to these fixed points by a process of fiducialisation, whereby the magnetic axis is measured in situ at the Bidder and the exact location of these reference points are then established by measuring offsets either via a coordinate measuring machine (CMM) or laser tracker type device. Offsets of the magnet axis in X, Y, Z type coordinate system in mm are then provided as part of the deliverables as a data set relative to these points. These points are then referenced at Daresbury Laboratory using our own Leica and Faro laser trackers which – along with offset data - then allows us to align the quadrupole magnetic axis with respect to our own survey network. An orientation vector for each data set is also required and this is likely to be best established off a machined plane of the magnet support. A complete set of survey data must be provided with each magnet upon delivery. The form of the survey data as a baseline minimum is as a tabulated list (Excel file) but preference is given for SpatialAnalyzer (SA) file (if this is capable of being generated by the Bidder). Each data set must be clearly and unambiguously identifiable with the specific magnet delivered. The fiducial reference points on the structure will be provided by a range of precision reamed holes - that will fit standard laser tracker target mounts with minimal error – and are located into various planes of the magnet support. The provision of these holes to agreed specification is the responsibility of the Bidder. The holes are nominally defined as 10 mm diameter with an H6/H7 precision finish (ISO 286-2) i.e. zero to 11/18 µm oversize. This hole size will fit our range of preferred laser tracker targets 0.5TH type Xxxxxxx. See this reference: xxxxx://xxxxxxx.xx/0-5th-series-smr-adapter.html If it suits the measurement process proposed by the Bidder at their premises, then the Contracting Authority may be able to supply as free issue several Xxxxxxx standard survey monument targets so that they can be incorporated into the measurement process. Otherwise it is assumed the Bidder will use their own targets (with suitable offsets stated with survey data provided upon delivery). The fiducialisation measurements should ideally be performed at 23°C to an RMS accuracy of ±0.025 mm. If temperature at the contractors cannot be set to ...
Survey and alignment. Each beam transport module will include fiducial points on the girder and xxxxxxxx in accordance with ESS-0012977 Fiducial Guidelines, Chapter 2.2, Reference P [SAG]. That is that fiducials should include one of the following methods for positioning of a 1.5” prism; • 6H7 Machined Hole • Glued assembly with M6 Hole • Cone directly machined onto the component. Fiducial locations, including orientation shall be approved by ESS survey and alignment team prior to STFC’s implementation. Before packing final alignment of each module will performed in a temperature controlled room (22.5oC) and a report produced. • Alignment of BPMs and Magnets relative to the girder • Documentation of survey equipment to be used • Documentation of procedure and setup • Data to be supplied in spatial analyser format • Magnets and BPMs fiducials to be aligned within ±50µm to the fiducials on the girder which will form the local network • Responsibility for magnet fiducials • Measurement of magnetic centre relative to the magnet fiducials • Survey and alignment of the beam pipe modules
