1 / 5

CM12 KEK activity

CM12 KEK activity. Yoshiyuki Morita. Conceivable contributions of KEK. Suzuki-san, head of KEK, decided not to give budget to KEK LHC-CC activity in fiscal 2009. Because of a lack of funds. However, Oide-san, head of accelerator division since April this year, will support LHC-CC.

Download Presentation

CM12 KEK activity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. CM12 KEK activity Yoshiyuki Morita

  2. Conceivable contributions of KEK • Suzuki-san, head of KEK, decided not to give budget to KEK LHC-CC activity in fiscal 2009. • Because of a lack of funds. • However, Oide-san, head of accelerator division since April this year, will support LHC-CC. • He will provide a small amount of money in fiscal 2009 (how much?). • Our conceivable contributions at present are surface treatments and vertical cold tests. • We have facilities for surface treatments. • We have cryogenic facilities. • We are constructing new EP facility for 509 MHz cavities. • Since the EP facility used for long time became old. • This facility will be ready in January 2010. • We can use new EP facility for LHC-CC • Vertical cold tests are needed to confirm cavity performances. • We are considering fabrications of equipments for EP to match LHC-CC, a cryostat for vertical cold test and RF measurement systems.

  3. Multipacting simulations • Multipacting simulation was done for 2-cell S-KEKB type cavity by Solyak-san. • We thank LARP people. • Multipactings at the opening of the coaxial coupler were found. • This type of multipacting shoud be two-side, 1/2th-order multipacting. • We have to increase coaxial gap to avoid the lowest order (n=1/2) multipacting. • Increase of gap length gives enough energy to emitted electrons to avoid secondary emission. • We observed the same type of multipacting in our 509 MHz KEKB crab cavity at the coaxial coupler at low fields. • Gap length was large enough to avoid the lowest order. • We could process in one hour.

  4. Multipacting on an iris • Liling-san simulated multipacting for the baseline cavity. • He found several multipacting levels. • It is understood that a type of multipacting is a two-side, n-th order one. (n=1/2,3/2,5/2, etc.) • We observed this type of multipacting in our KEKB crab cavity. • Multipacting level exists where This type of multipacting was not severe in our KEKB crab cavity.

  5. To Rama-san Please show these slides if I can not attend CM12. I am not used to handle WEBEX system. I could not ask experts because time is too early in the morning. I am calculating cavity parameters you asked. I will give you these parameters soon.

More Related