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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.

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CLIC Module BPM integration

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  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.

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