SIXTH MEETING FOR RFQ COOLER AND BUNCHER AT ISOLDE PROJECT

FOURTH MEETING FOR RFQ COOLER AND BUNCHER AT ISOLDE PROJECT

Present: T. Fritioff, M. Lindroos, A. Jokinen, I. Podadera, F. Wenander

Now that the decision with TIS about using ballons has been taken, a meeting with VAC people will be held to discuss about the vacuum system.

Beam line optics:

To make maximum acceptance the triplet has to be as close as possible to the RFQ.
The last triplet, as the beam there is so good after RFQ, could be placed wherever.
AJ: The emittance accepted with the present geometry is around 40π mm·mrad but it’s very related with the injection geometry of the RFQ.
TF: The first triplet will go into the cross piece.

Mechanical:

The trailer used to remove the RFQ won’t include the pump in the injection which will stay there and not be removed. So now, the trailer definition changes.
Everything which isn’t in the trailer will be its own support.
TF: for the cross-piece, it could be made a non-standard piece including a bellow at the end of one of his flanges (to easy the removal of the trailer).
AJ: (about the proposal of axial electrodes package) with this structure is easy to send the heat inside the vacuum chamber of the RFQ, when we want to bakeout the system.
Mats suggests that we should contact EST/SU (J. C. Gayde, C. Lasseur) for suggestions about the external reference marks to align the optics.

Next meeting in date to be confirmed.