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EUROTeV Diagnostics WP5

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This document outlines the development of a prototype Precision Beam Position Monitor (PBPM) and a Wide Band Current Monitor (WBCM) as part of the EUROTeV Diagnostics work package. Key deliverables include designing and building the PBPM with high precision requirements, conducting bench tests, and creating prototype systems for beam testing at CTF3. The specifications highlight stringent parameters such as a 100 nm resolution for the PBPM and a bandwidth exceeding 20 GHz for the WBCM. These developments are essential for accurately measuring beam parameters in the CLIC accelerator project.

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EUROTeV Diagnostics WP5

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  1. EUROTeV Diagnostics WP5 CAVBPM: Precision BPM. WBCM: Wide band current monitor. Lars Søby, CERN AB

  2. PBPM- deliverables • Prototype PBPM: • Design and build prototype. • Report on bench tests: • Design and build high resolution (100nm), mechanical stable test bench. • Develop front end electronics. • Measure PBPM. • Report on beam tests: • Build 3 PBPMs with separate supports and test with CTF3 beam. Lars Søby, CERN AB

  3. PBPM-Requirements • Aperture: 4mm • Resolution: 100nm • Absolute precision: 10μm • Rise time: <15ns EUROTeV  Dynamic range: ±1.5mm (15 bits) Linearity error: < 1% 24H stability: 1μm Vibrations <100nm Low frequency cutoff: 100kHz High frequency cutoff: 30MHz Bake out temperature: 150C Operating temperature: ~20C Vacuum: 10-9 Torr ME  Lars Søby, CERN AB

  4. PBPM-beam parameters For CLIC the BPM’s are foreseen for the main Linac, with minimum one BPM per quadrupole i.e. 2600 BPM’s. We need additional BPM’s for the accelerating structures which could bring the number up to 20000. Lars Søby, CERN AB

  5. WCM as a BPM • The image current distribution on the circumference reflects the beam position. • Intensity signal () = All resistor are voltages summed. • Position dependent signal () = voltages from opposite resistors are subtracted. Lars Søby, CERN AB

  6. Inductive Pick-Up • Electrodes are combined in pairs so that each transformer sees half of the load • Frequency low cut-offs are limited by connection parasitic resistances and primary electrode inductance. Design: M. Gasior Lars Søby, CERN AB

  7. Inductive Pick-Up This is what we want to do!! Lars Søby, CERN AB

  8. PBPM • Low sensitivity to beam spray, halo. • Independent on bunch spacing. • Low longitudinal impedance. • Low frequency FE electronics, could be passive  cheap. • Sensitivity OK. • Complicated design. • Mechanical stability in 100nm range?. Lars Søby, CERN AB

  9. PBPM Fellow hired from September 2005. L. Søby working 5% in 2005 and 25% in 2006 and 2007 Lars Søby, CERN AB

  10. EUROTeV Diagnostics WP5 WBCM: Wide band current monitor. Lars Søby, CERN AB

  11. WBCM- deliverables • Report on BW limits: • 3D EM simulations to identify high frequency limits. • Improved prototype system: • Modify design and simulate. • Build new WCM and test on bench. • Report on beam tests: • Tests with CTF3 beam Lars Søby, CERN AB

  12. WBCM-Requirements • Beam current monitor with > 20GHz band width for measurement of intensity and bunch to bunch longitudinal position. • Main beams, drive beams and damping rings. EUROTeV  Low frequency cutoff: 100kHz Bake out temperature: 150C Operating temperature: 20C Vacuum: 10-9 Torr 100kHz-20GHz WB signal transmission over 10-20m. ME  Lars Søby, CERN AB

  13. WCM Design: J. Durand, P. Odier Lars Søby, CERN AB

  14. WCM Lars Søby, CERN AB

  15. WCM Lars Søby, CERN AB

  16. WCM Lars Søby, CERN AB

  17. WBCM Scientific associate hired from January 2006. L. Søby working 5% in 2005, 25% in 2006 and 2007 Lars Søby, CERN AB

  18. EUROTeV WP5 Thank you for your attention Lars Søby, CERN AB

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