BLTWG Meeting 10/19/2007
The meeting will be booked in VRVS for Friday 19 Oct, from 10am to 12am (EST).
News from Ken Livingston
The diamonds [promised by Element 6] are supposed to arrive within the next 2 days. Here's the description I've beeen given on the phone:
- 2 x Type 1b Natural, yellowish colour
- 2 x Type 3a Synthetic cvd, cubic (probably means square)
- 2 x Type 2a Synthetic hpht, octahedral, bright white
- 2 x Type 2a Natural, large, irregular brownish.
Yang will ask a Glasgow technician to make some mounts for them. These diamonds need to go back to Element 6 fairly soon, or they'll invoice us for them. I said we'd discuss what we want to keep and what to return after the beamtime.
Alas, despite my clear request for thin crystals, the diamonds are quite literally stones! One is the size of the koh-i-noor. These stones are all different, but roughly they are all 5mm x 5mm x 5mm. One of them is 14mm x 8mm x 5mm, the natural diamond.
Tagger Engineering Design Specification
Franz has put all of the relevant materials for this discussion in one place on the wiki here. Most of the discussion focussed on the specifications document. Franz has taken over version 5 from last May, and has noted the following deficiencies that must be corrected before the 100% engineering design can be completed.
- The number and location of the alignment holes in the pole shoes is to be determined.
- The exact size and shape of the vacuum box exit port for the unscattered electron beam is not yet finalized.
Richard added that the plan for internal alignment of each dipole magnet must be fully worked out before the alignment pin positions can be fixed. This plan should lay out a means by which the precise positions of the pole pieces can be transferred to reference points visible outside the vacuum box after the pole pieces are fixed in their final positions but before the vacuum box is closed. In the assembly plan worked out by the Glasgow group it is not clear how the position of the upper pole shoe can be kept from moving between the time that it is positioned within the vacuum box frame and the time that it is attached to the upper part of the yoke and then united to the return yoke.
More detailed notes of this discussion together with a set of actions to be taken have been posted by Franz Klein under the heading Discussion of the Statement of Work.
