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[acfa-ir 90] Minutes of 52nd FFIR/BDSIM meeting on 5/7/2003

Subject:   [acfa-ir 90] Minutes of 52nd FFIR/BDSIM meeting on 5/7/2003
From:   田内 利明 <toshiaki.tauchi@xxxxxx>
Date:   Wed, 14 May 2003 14:33:33 +0900

Dear Colleagues,

We will have a next meeting at 13:30-15:30 on 21 (Wed) May 2003.  The place
is  room#425 at the 4th floor of 3-gokan.  It will be TV(ch#31) conference.

At this meeting, Kubo will talk on "Review of Ground Motion Effect on
Luminosity" and other status report.

Can you also find an appended minutes of 52nd FFIR meeting?
Please also see a web site of http://acfahep.kek.jp/subg/ir/minutes.html .
It may take some time to uodate the web site. So if you do not see the
minute, please wait for about 30 min. .

Comments and questions are welcome.

Best regards,
T.Tauchi  (KEK)

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;
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
Active feedback  test, which will be collaborated with accelerator R&D
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.
All the measurements shall be compared with ANSYS calculations in order to
establish proper modeling in the calculations.

(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

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 .