1 / 4

Mechanical design for the PBPM

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.

kuri
Download Presentation

Mechanical design for the PBPM

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. 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

  2. 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

  3. 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

  4. 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.

More Related