Dear Sasha,

the Alu vessel with flanges containing the tpc was of course optimized
with respect to the available space. It is hardly possible to
increase it! Its dimensions are as follows:

- outer diameter of flanges: 346 mm
- inner (free) diameter of flanges & vessel: 282 mm
  the space between inner and outer diameter is used for the magnet
  coils 
- thickness of Alu cylinder: 4 mm or 2.5 mm (the 2.5 mm thickness was
  not accepted for 10 bar operation, but is ok for vacuum!)

- thickness of the 2 Alu flanges (welded to the Alu-cylinder):
  18 mm each (with the corners for welding 32 mm each)
- length of the Alu vessel (incl. Alu flanges): 566 mm
  (therefore length of free access to Alu wall: 502 mm)

- thickness of stainless steel beam entrance flange: 15 mm (+3)
- thickness of stainless steel back flange: 17 mm (+3)

- total length of tpc vessel incl. all flanges: 598 mm

if you need the drawings from the PSI archive, the numbers are
2-43.3.1347b, ..1349b, ..1350c, ..1351a,  ..1352b
but Malte or I would have to find out how to extract them.

With best regards

Claude