Status of ATF2 Cavity BPM ProjectSep 29, 2005

• Project Scope: Instrument both couplers ATF2 cavity BPM’s (35)

• Produce prototype for December cavity test

• Production complete 31.03.06

• Want full integration into ATF2 control system.

Table 1: System Specifications:

BPM dipole frequency (MHz) 6430

Kick factor (J/C^2/mm^2) 1.3e10

Decay time (ns) 350

Required resolution (single bunch – nm) 100

Dynamic range (um) 1000

Nominal charge (ppb) 1e10

Cavity BPM electronics system

ATF2 Cavity BPM receiver board schematic

Silk screen – ATF2 cavity BPM electronicsSeptember 28, 2005

HOM Board100 channel production finished Sept 20

Hardware Status – Downmix Chassis

• Prototype submitted for printing Sept 29 (CA). • Parts on hand –

– Except limiters (4 to 6 weeks) and power meter– Testing begins Oct 12

• Tests of HOM board (similar)– gain 33dB– Linearity second side band 70dB down at top of range

of -24dBm– Noise figure 5dB– Channel to channel coupling -60dB

• Board designed for machine assembly

Table 2: Key sub-components of the ATF2 BPM system.

Component Responsible for production

Number

Hybrid KEK 2 for each cavity

Front end heterodyne receiver

SLAC, ILC Department 2 channels / cavity

Digitizer & crate SLAC and Struck I. Systeme

3 cavities per 8 channel VME digitizer module; 9 modules per crate (one crate required)

LO Source and amplifier

SLAC, ILC Department 1

Calibration source SLAC (purchased) 1