Minutes BWS Upgrade: Electro-Mechanical Design Meeting #17 -- 28th November 2016 --

Participants: R. Veness, F. Roncarolo, J. Emery, P. Andersson, D. Gudkov, W. Andreazza, J.L. Sirvent, C. Vulliez, A.Goldblatt

Agenda (https://indico.cern.ch/event/569142/)

1. Potential issues for EYETS installation

1.1 Glass Encoder Disk: Situation and options (Dmitry & Jose)

• Delay on Encoder Disk due to bad adherence of chrome on glass (raw material send to provider)
• Disks need to be re-coated ( potential schedule risks if they have more problems...)
• Disk must be ready 5th Dec.
• Ideal needs for testing disks prior to installation:
  • 1. Mount on holder and optical bench for a quick functional validation
  • 2. Clean disks before mounting on PSB Prototype
  • 3. Mount disk on prototype and single scanns for alignment and test.
  • 4. Ideal would be to perform calibration with laser system (possible?).
• Same disk for all operations or parallel work? : Validation on bench and on PSB Proto must be same disk.
• Metallic disk situation:
  • Sent without the diamond turning (in error). They will do this week.
  • Probably we will not get engraved disks this year (1-2 weeks to get engraved in NL)
  • If received W48 must be ready W50

1.2 Bearings (Dmitry)

• Current installed bearings have heduced clearance (very hard to move, friction) this one was accepted by Vacuum.
• Standard bearings (SPS type) are now at CERN, but need to be tested.
• Need 0.4-0.5 Nm to rotate curent bearings. Thinks it will be better but not necesarily zero.
• Agreed (William/Dmitry) to install on the ML instrument.
• Bearings performance compared by Jonathan on other test-bench
• Check precission on standard clearance bearings. (need calibration bench for this?)
• New bearings need to be cleaned and send for vacuum acceptance (William). Potential schedule risk.

1.3 Vacuum Acceptance (William)

• 2 measurements done of the whole instrument (Bad results)
• Opened and re-assembled
• VSC Think there is an issue of cleaning with is interfering with the measurement.
• Not 3rd cleaning and will re-measure
• Cleaning service changed products?
• Tank was fully accepted by VSC and can be installed
• Macor connector was accpeted in the SPS
  • Ray will talk to Giuseppe/Jose?
  • In theory, it will not stop installation.
  • We may have to add a pump.
• Wire qualification:
  • Request made by Jonathan
  • William will help on follow-up.

1.4 Callibration (Jonathan/Federico/Aurelie/Jean)

• Infrastructure is ready (stages and scopes acquisitions)
• Control system is not ready for calibrations (Jonathan)
  • Other possibility using other system ? (Federico)
  • In theory yes, quick (but not optimal) solution with DSpace system displacement to 867, required modifications for triggering system. (Jonathan)
  • 1 month of work required for needed modifications and controller paramaters extraction.
• We'll like to put the scanner on calibration bench prior to installation on PSB and perform a first calibration.
• A big amount of time required for such work. Potential blocking point.

1.5 Cable installation (Federico/Jonathan)

• Normally we should make some test scans as soon as we install. (Federico)
• Approval for cabling is agreed but date is not known . (William will check)
• Jonahtan has installed 3 racks, but they have not planed to install power and network on the racks.
  • Done 2 weeks ago, some checks are still needed for the installations. Aurelie will help here .

1.6 Any others?

• No announcements done here.
• Latest date for installation in PSB will be ~10th Feb.

2. Initial budget estimates

• Federico will send Excelsheet with cost for acquisition and control electronics. (Jonathan's excelsheet)

3. Agreements

• Installation of tank and support (but not instrument) on the 15th December
• Installation of the instrument 10th February.
  • Hope to be able to calibrate and operate in the tunnel.
  • If we have a complete working instrument that has been tested on the bench then we will install it.

4. Detected installation blocking points:

• Test with new bearings
  • Dmitry to send a mail when the scanner is assembled with new bearings.
  • Jonathan to communicate wen it has been tested.
  • William to update us on vacuum acceptance test of bearings.
• Glass encoder disc.
  • Jose Send mail when disk arrives - Check if possible to collect it
  • Jose will make normal acceptance test and let know the results.
  • Also some testing will be done to test the disk mechanical resistance (some cycles)
• Vacuum acceptance:
  • William will let know when the hole instrument is accepted for installation.
• Defined priorities for Jonathan are:
  • test the bearings
  • prepare d-space system
  • racks and system (first check the installation dates). Aurelie has offered to help here.