Design of FD S-Band BPM support : pending questions

A.Jeremie and N. Geffroy(after discussions with colleagues

from SLAC, KNU, KEK etc…)

ADAPTER on the end of the cavity part of the BPM IS VERY IMPORTANT (dimensions have changed since this drawing. Now: Magnet bore is 50mm;

OD of BPM pipe is 48mm, ID is 40mm)

Is this adapter really needed?Just global centering or precise adjustment?How precise?

SBPMQC3

SBPMFFTB2.13

S3.00

SF1FF QF1FF

100 100

450.1 200

180

SBPMQC3

SBPMFFTB2.13

S3.00

SD0FF QD0FF

100 100

76.2

450.1200

18076.2

785380785380

Final Doublet Table Configuration(Okugi’s presentation, December meeting)

2630

How to Support S-BPM from QD0, QF1?

BPM must be supported here.(Cantilevered)

No space here due to water/electrical connections.

Because S-BPM must move with quad,it must be supported from quad. There is no plate between quad magnet & mover. There IS a plate between sextupole and its mover.

Since BPM with flanges, is the BPM “tube” around the beam-pipe or part of the beam-pipe?Will this transmit vibrations to the magnet?Does it need to be supported on both sides of the magnet?

We prefer this solution:It looks more stable with respect to vibrations. And if, we make sure there is no contact between top and bottom part (except bolt), the BPM is really well fixed in the cradle.

But how is this “adjustable” part compatible with the “fixed” adapter seen on slide 2?

SLAC

KNU

130mm!

!

Vertical stage from Newport (1700$ each)