CERN - European Organization for Nuclear Research

Minutes of the CLIC Meeting - 18 December 2006


Agenda:
Status of the Precision Beam Position Monitor (PBPM) for EUROTeV
Status of the Wall Current Monitor (WCM) design for EUROTeV
Speaker:
Ivan Podadera Aliseda, Alessandro D'Elia


Status of the Precision Beam Position Monitor (PBPM) for EUROTeV
The design of a new Precision Beam Position Monitor (PBPM) foreseen for the next generation of linear colliders has been completed. The PBPM is based on a design already used in CTF3 and aims for a resolution of only 100 nm in a range of ±0.5 mm, with an aperture of 6 mm, and a bandwidth extending from 100 kHz to 30 MHz.
This talk will focus in presenting the final design of the PBPM, giving an overview of the key design points which have been studied and summarizing the results of the microwave simulations. In addition, the present status of the assembly, the bench tests and the CTF3 beam tests in 2007, will be discussed.
copy of Ivan's transparencies (pdf format)

Discussion
- Three PBPMs are foreseen to be mounted over a short distance in CTF3 with the centre one movable by a precision mover.  A mover suitable for a high radiation environment has to be selected.
- Due to the small aperture (60 mm diameter),  the optics has to be studied at the suitable places (i.e. girder 14 or INFN chicane bypass) with the given longitudinal extension for the 3 PBPMs.
- The vacuum chambers around the installation should be prepared sufficiently early. The INFN chicane bypass would require the addition of a dump window and a possible modification of the present beam stopper.
- Magnetic interference for mounting at quadrupoles has not yet been studied.


Status of the Wall Current Monitor (WCM) design for EUROTeV

In order to resolve accurately bunches with a spacing of 67 ps foreseen for the CLIC drive beam and CTF3, a Wall Current Monitor (WCM) is needed having a bandwidth of 20 GHz and a low frequency cut-off of 100 kHz. The state of the art of the WCM design, characterization and test bench improvement will be discussed, as well as some thoughts for the beam tests foreseen in CTF3 in autumn 2007.
copy of Alessandro's transparencies (pdf format)


Back to the CLIC meeting Home page

Frank Tecker  - Last updated  18-12-2006