CWCT & BCM-CW

CW Current Transformer & Beam Charge Monitor for CW beams and macropulses

For CW beam and macropulses: ADS, SNS, HPPA


Average current resolution

Fast beam loss interlock

1 μA 

 1 μs

 

Principle 

The CWCT is a current transformer with strict limits on lower and upper cut-off frequencies, tailored to the beam RF. Its lower cut-off assures negligible droop between bunches. Yet, droop is high enough to allow fast differentiation.

Its upper cutoff is high enough to allow output signal return to baseline after each bunch, yet low enough to assure an output duty factor close to 50%. Thus it is tailored to the bunch length, facilitating the measurement of short bunches.

The BCM-CW-E is the electronics module processing the CWCT output signal. By applying fast sample-and-hold techniques it measures the average beam current with microsecond response time. Properly adjusted signal amplification and filtering improves the resolution of small beam current fluctuations.

Features 

Beam repetition frequency 60 - 500 MHz

Independant of bunch shape and width

EMI, RFI and temperature immune

Linearity error < 1.5%

Beam loss resolution < 1%

UHV compatible down to 1E-11 mbar

CWCT & BCM-CW-E SET

CWCT is mounted directly on the beam line
Improved radiation tolerance on option
Ceramic gap vacuum-brazed over kovar transition
Material AISI-304, 316LN on option
Arbitrary shape aperture on option
1 core or 2 cores on option

BCM-CW-E uses fast sample-and-hold  techniques to average the beam current

BCM-CW-E inserts into a wired station of BCM-RFC, the 19” 3U RF-shielded chassis including power supplies.

Up to 10 stations per chassis can be installed.


Specifications 

CWCT & BCM-CW sensitivity

20 V/A

Gain

0 dB

20 dB

40 dB

Full scale

100 mA

20 mA

2 mA

Uncertainty

+/- 100 μA

+/- 10 μA

+/- 1 μA


CWCT & BCM-CW sensitivity

10 V/A

Gain

0 dB

20 dB

40 dB

Full scale

200 mA

40 mA

4 mA

Uncertainty

+/- 200 μA

+/- 20 μA

+/- 2 μ


CWCT & BCM-CW sensitivity

5 V/A

Gain

0 dB

20 dB

40 dB

Full scale

400 mA

80 mA

8 mA

Uncertainty

+/- 400 μA

+/- 40 μA

+/- 4 μA

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