1 / 13

CLIC Module BPM integration

CLIC Module BPM integration. Outlook:. 3 Quad BPM’s 6 (3) Structure BPM’s (WFM) 1 (+) BLM. BPM specifications Possible BPM types Wake Field Monitor Acquisition system Integration of electronics Summery. Specifications. Possible BPM types.

luana
Download Presentation

CLIC Module BPM integration

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. CLIC Module BPM integration Outlook: 3 Quad BPM’s 6 (3) Structure BPM’s (WFM) 1 (+) BLM • BPM specifications • Possible BPM types • Wake Field Monitor • Acquisition system • Integration of electronics • Summery

  2. Specifications

  3. Possible BPM types • Strip line BPM’s and Button’s have been discarded for both beams. It is not possible to obtain micro-meter resolution without sophisticated FE electronics,like variable attenuators and phase shifters in order to improve the CMRR (~90dB), which limits the resolution. • Inductive BPM. • Cavity BPM • Re-entrant cavity BPM

  4. Inductive BPM • Low frequency BPM (10kHz-100MHz. Used in CTF3. • Good linearity around the electrical center, good center stability • Electrical center detemined by the electronics • Longitudinal impedance minimized by the use of a titanium resistive coating. • Real current measurement. No feed-thru’s • Resolution: • Limited by CMRR (~90dB) of FE electronics 3*10-5 i.e. ~200nm for the Main beam. Beam tests foreseen in CTF3 in November • Thermal noise not a problem. • Time resolution OK. Electronics: Active hybrid and ADC

  5. Cavity BPM • Difference of large numbers problem (CMRR) reduced to rejection of the primary fundamental peak. • Excellent center stability. • Damping time quite high due to intrinsic high Q. QL→ <400 Electronics: Hybrid, Mixers, filters, RF reference and ADC A common mode free cavity, developed at SLAC, M. Wendt.

  6. Re-entrant Cavity BPM (CALIFES) Re-entrant geometry for a higher frequency separation between the monopole and dipole modes. →Better CMRR Resolution: ~ 1um (CALIFES ~5um) Qld = 50 → Time resolution ~ 2-3ns ID 18mm; Length ~100mm. Electronics: Variable attenuators, phase shifters, hybrid, mixers, filters, RF reference and ADC Square root of R/Q CLIC Drive Beam BPM 6

  7. Wake Field Monitor • Works like a cavity BPM • 16Ghz dipole mode • Hybrid inside vacuum tank • Centering accelerating structures • Electronics needs park protection Hybrids SMA feed – thru’s Outputs from damping wave guides

  8. Module instrumentation Current measurement 1 per sector for BPM normalization BLM Inductive BPM Cavity BPM Cavity BPM WFM* 6 Very radiation hard Very close < 1m Hybrid Hybrid Hybrid Hybrid’s Tunnel Analogue FE Analogue FE Analogue FE Analogue FE < 35G/Y Below girder, shielded radiation hard electronics, Data link HV Digital FE Digital FE 220V or DC Power High Voltage UTR 400m max. Data treatment RF reference OBS: Only 4 cables per module ! Normally 2-3 cables per BPM of ~ 2kCHF = 40kCHF So a reduction of 30kCHF per module using FE digitizers. Analogue FE = Down converters, Signal conditioning, Calibration units Digital FE = Digitizers and control

  9. CLIC Module Q-BPM Q-BPM Beams Drive Beam Main Beam Actuator control BLM Other electronics Hybrid Q-BPM Wake Field Monitors

  10. CLIC module

  11. Radiation in PS Radiation reduced by a factor 1000!!. Courtesy J. Belleman

  12. Electronics in the tunnel LAPP digital FE Designed to Resist up to 350GY H=27, L=45, D= 30 cm Analogue FE < 35GY/Y Analogue FE = Down converters, Signal conditioning, Calibration units Digital FE = Digitizers and control

  13. Summery • Space must be foreseen for electronics on the module and in a radiation shielded location within a few meters, i.e. in the floor. • A digital front-end reduces significantly the cable costs • A dedicated study and design of CLIC BPM’s and WFM is needed.

More Related