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EMMA WCM-Based Bunch Charge Monitoring Set-up. A. Kalinin EMMA tasks, experiments, and procedures 01 March 2012. Existing set-up:. IL BPM1 Cable to MCR BPM Scope Combiner Ring/Ext BPM Front-Ends A pair of vertical buttons is used.

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emma wcm based bunch charge monitoring set up

EMMA WCM-Based Bunch Charge Monitoring Set-up

A. Kalinin

EMMA tasks, experiments, and procedures

01 March 2012

existing set up

Existing set-up:

IL BPM1

Cable to MCR

BPM Scope

Combiner

Ring/Ext BPM Front-Ends

A pair of verticalbuttons is used.

The Front-Ends are modifiedto sum up two button signals.

To see bunch charge in the ALICE train (+FC), the first bunch in particular.

To compare the EMMA bunch charge to the ALICE bunch charge.

To have a turn-by-turn charge picture not obscured by bunch oscillation.

To see a charge at the extraction.

a new wcm based set up

A new WCM-based set-up:

IL WCM Splitter 6dB

to EMMA ToF Scope, Trigger

Cable, ~17m

Ring WCM Splitter 6dB

to EMMA ToF Scope, ToF? Combiner 6dB Front-End

Coupler

Cable, ~9m

Att 1dB

EL WCM

Cable, ~1m

Att (6+2)dB Cable to MCR

MCR BPM Scope

bunch charge signals
Bunch charge signals:

...

IL first turn second turn n-th turn EL

~15ns 55.2ns ~18ns

Use of the Ring WCM for ToF

  • WCM bandwidth is ~4.5GHz, the output is a bell-shape pulse ~100ps.

The magnitude is ~(40pC/100ps)x2Ohm=0.8V.

  • Irregular couplers are available to transform to the ‘derivative’ shape.

Transformation ~1/10.

Coupler 1, the slope always ~700ps Coupler 2, slope = pulse length

For 20MS/s, 14 samples 3 samples