Minutes of 52nd FFIR/BDSIM meeting on 5/7/2003
The meeting was held in a room of 325 at KEK, 13:30-15:00, 5/7/2003. We discussed on plan of support tube R&D in this FY, FEATHER and others.
(1) Plan of Support Tube R&D in this FY (H. Yamaoka, KEK)
(transparencies, 8 pages, pdf ,517KB )
First, Yamaoka briefly summarized achievements of support tube R&D in FY02. A 1/10 model of a cantilever has been fabricated. This cantilever model has 810mm length and 80mm outer diameter of 10mm thick Al tube and it is longitudinally segmented into 4 tubes. So, there are three flanges and one flange for a central tube to be fabricated in this FY. Oscillation properties of the model have been studied with taper and flat flanges connected by different number of M6 bolts. Results were summarized in previous meeting on 3/5,2003 (http://acfahep.kek.jp/subg/ir/minutes/d030305.html ). Major conclusions were summarized as follows; (1) Taper flanges are more rigid than the flat ones. (2) Stiffness of support base is difficult to be defined in the FEM/ANSYS calculations, so there are systematic differences between measured and calculated resonant frequencies, especially in high frequencies.
In this FY, following studies will be planned;
All the measurements shall be compared with ANSYS calculations in order to establish proper modeling in the calculations.
- Effects of "heavy load" inside the cantilever to simulate tungsten mask and a final focus magnet.
- Tests with mounting isolators which are passive device for vibration isolation.
- Active feedback test, which will be collaborated with accelerator R&D group.
- Tube structure (both-ends supported)
- Measurements of connecting tubes with flat and taper flanges.
- the same items as the cantilever; heavy load, vibration isolation, and active feedback.
- Optimization of thickness of central connection tube, which shall be thinnest keeping stability of oscillation properties of the tube.
(2) FEATHER: Status Report (N.Delerue, KEK)
(transparencies, 4 pages, pdf ,2.1MB )
Nicolas reported on recent beam tests and kicker design studies. In the beam test, GPIB communication over IP has been validated. However, he found some software problems to be debugged. More beam tests will be needed after fixing the software problems.
For the design of kicker, "shieldless" solution has been chosen for simple structure. Major concern in this design must be rigidity of the electrode. He introduced a ceramic support for the rigidity. He will complete the design for fabrication soon.
The next meeting will be on 21May (Wed.), 2003,13:30 - 15:00 am at 3 gokan, 425 .