Mechanical design for the pbpm
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Mechanical design for the PBPM. 4 electrodes only, for simplicity. SMC connectors. Ceramic vacuum chamber with resistive coating Bellow allowing 0.3 or 1 mm misalignment (depending on length). Helicoflex vacuum seals. Titanium coating. Φ 6 mm. Resolution: 100 nm. Aperture: 4-6 mm.

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Mechanical design for the PBPM

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Mechanical design for the pbpm

Mechanical design for the PBPM

  • 4 electrodes only, for simplicity.

  • SMC connectors.

  • Ceramic vacuum chamberwith resistive coating

  • Bellow allowing 0.3 or 1 mm misalignment (depending on length).

  • Helicoflex vacuum seals.

Titanium coating

Φ6 mm

Resolution: 100 nm.

Aperture: 4-6 mm.

Absolute precision: 10 mm.

Dynamic range: 15 bits (±1.5 mm).

Bandwidth: 100 kHz – 30 MHz.

Bakeout temperature: 150º C.

Vacuum: 10-9 Torr.

Φ68 mm

98 mm


The response of the pbpm

The response of the PBPM

Simulation of beam horizontal movement using wire method in HSSS

S21

  • Simulations show:

  • Expected non-linearity of D- signal.

  • Unexpected non-linearity of the S-signal.

  • Good linearity of D/S.

  • More simulations will follow to better understanding and optimization.

S11


Longitudinal impedance and thin film coating

Longitudinal impedance and thin film coating

High frequency simulations with PSPICE1)

  • Thin film diameter: 6 mm.

  • Outer ceramics diameter: 10 mm.

  • Electrodes inner diam.: 13 mm.

  • Length: 50 mm.

  • The high frequency longitudinal impedance is determined by the titanium coating, and is at present 11 ohms.

  • There appear some bumps in the region around 1 GHz unlike the existing CTF3 version.

  • Simulations show they can be damped reducing the ratio between the diameters (smaller coaxial impedances).

  • The cut-off frequency is always higher than the specifications.

Electrodes current

Impedance

Titanium current

fcutoff

Rcoating= 11.2 Ω

fcutoff = 226.8 MHz

1) Using the model described in M. Gasior, CERN-AB-2004-092; CLIC-Note-611


Outlook

Outlook

  • Optimize and set all the geometrical parameters.

  • Optimize and set the value of the thin film.

  • Optimize the linearity (in relation with the geometrical parameters).

  • Simulation of the wakefields or calculation from the longitudinal impedance in PSPICE.

  • Optimize the design of the alignment support.

  • Launch the mechanical fabrication of one prototypes. Critical components designed. Feedback and offers from companies obtained.

  • Construct the test bench.

  • Follow-up of the electronics design of the signal treatment. The goal is to achieve more than 90 dB CMRR at 30 MHz.

  • Publish report by end of May 2006.


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