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.
EMMA tasks, experiments, and procedures
01 March 2012
Cable to MCR
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.
IL WCM Splitter 6dB
to EMMA ToF Scope, Trigger
Ring WCM Splitter 6dB
to EMMA ToF Scope, ToF? Combiner 6dB Front-End
Att (6+2)dB Cable to MCR
MCR BPM Scope
IL first turn second turn n-th turn EL
~15ns 55.2ns ~18ns
Use of the Ring WCM for ToF
The magnitude is ~(40pC/100ps)x2Ohm=0.8V.
Coupler 1, the slope always ~700ps Coupler 2, slope = pulse length
For 20MS/s, 14 samples 3 samples