Application to gate valves

1
Application to gate valves
Yusuke Suetsugu

• Circular gate valve (f94mm) 2005

A dip with a depth of about 0.5mm for VAT seal
Outside shield (No sliding)
Open
Ref. Finger-type
Close
VAT Seal
2
Application to gate valves

• Circular gate valve (f94mm)
• Collaboration with VAT
• Copper RF-shield
• Other part is the same as the conventional one
• No cooling water

Inside view
Comb-type
Conventional finger-type
3
Application to gate valves

• Racetrack (150?50)2006
• Installed in March, 2006

Inside view
Conventional finger-type
Comb-type
4
Application to gate valves

• This year 2007
• Gate valve for a beam duct with ante-chamber

Will be installed in the summer of 2007
5
Application to gate valves

• Aperture with ante-chamber part

• Example of bellows chamber

6

• Dear Dr. A. Seryi
• I have to ask VAT Co. about the design of the
  special gate valves in any way. Personally, it
  will be safe to use 4 valves with one aperture
  each.
• To make a gate valve with two apertures is
  technically very interesting (at least for me),
  and may be possible in principle, but I have
  never seen such valves, and developing it will
  require further RD. The vacuum sealing will be
  a circle surrounding two apertures, which has no
  problem. A problem is how to make a sure
  electric contact at the apertures simultaneously,
  when the valve is open. If sufficient
  mechanical strength of the body could be kept, it
  will be possible. Detailed design and calculation
  is necessary. Note that to connect a beam pipe
  with two apertures with one flange is also
  possible.
• The RF-shield valve as shown in Haba-sans slide
  (we call it a comb-type RF-shield) can fit to a
  complex aperture, such as a beam duct with
  ante-chamber. The RF-shield can be applied to a
  gate valve with two apertures in principle. This
  structure, furthermore, can be easily applied to
  such a small aperture compared to the
  conventional finger-type RF-shield. However, we
  have never considered the case with two apertures
  as described above. There is no impedance
  calculation of such valves. Instead, I had
  calculated some RF-properties about that
  RF-shield itself. Please see the following
  references (the calculation is in the last one)
• "APPLICATION OF COMB-TYPE RF SHIELD TO BELLOWS
  CHAMBERS AND GATE VALVES", Y. Suetsugu, K.
  Kanazawa, N. Ohuchi, K. Shibata, M. Shirai, Proc.
  PAC2005, May 16-20, Knoxville, pp.3203-3205.
• "Development of a bellows assembly with comb-type
  RF shield for high current accelerators", Y.
  Suetsugu, M. Shirai, K. Shibata, K. Murata, M.
  Kaneko, K. Sakamoto, K. Sugisaki and M. Kawahara,
  NIM-PR-A, 531 (2004) 367-374.
• "Possibility of comb-type rf shield structure for
  high-current accelerators", Y. Suetsugu, M.
  Shirai and K. Shibata, PRST-AB, 6, 10 (2003)
  103201.
• Best Regards,Y. Suetsugu, KEK