QBPM specifications from Steve Smith CD1

Quadrupole-type BPMs

slide 6 from Steve Smith's CD1 talk 11/4/98

Description:

Each linac quadrupole supports a stripline BPM.
Matched cable sets carry the signals to QBPM processors in the sector support buildings.

Requirements:

Parameter	Value	Conditions
Resolution	1 mm rms	@ 6x10³ e- single bunch
Position Stability	1 mm	over 24 hours (!)
Position Accuracy	200 mm	wrt quad magnetic center
Position Dynamic Range	ą2 mm
Charge Dynamic Range	5x10⁸to 1.4x10¹⁰ e- per bunch
Number of bunches	1-95 or 1-190
Bunch spacing	1.4 or 2.8 ns

Baseline Cost Model

We assume thatQ-BPM’s will be instrumented by the same processor developed for the
NLC Damping rings. Signal amplitudes in a -10 MHz bandwidth around 7 14 MHz are
demodulated and digitized in a module based on the PEP-II BPM processor.

Design Goal (What we realy plan to do)

We expect to economize by developing a switched-capacitor analog memory chip, but
do not depend on it for initial costing purposes.

Quantities

Sources	280
Damping Ring Complex	447
Pre-linacs	660
Main Linacs	1416
Beam Delivery	758
Total	3561

Risks

Develop calibration and test methods to achieve and verify required resolution and stability over operating parameters.
New sampling chip solution promises cost savings, but performance is not established.