CERN Accelerating science

Application functionality

Assume all acquisitions archived and logged.

Transfer Line

• Calculate and steer angle and position of beam using BPMs and elements in transfer line.
• Need accurate measurement of optics in lines to calculate x, x’, y, y’
• manual and automatic injection steering to reduce injection oscillations (kicker control, orthogonal knobs, bumps, aperture scans etc…)
• Matching lines & LHC as one, OTR screens… etc.

First turn

• Trajectory acquisition
• Threading
• Turn by turn over first N turns
• Closure
• Injection point correction

Orbit

• Acquisition, orbit correction, average, difference 
• Harmonic analysis
• Energy measurement, mis-match, adjustment using correctors etc.
• Sum signal of BPMs etc.
• Beta beating analysis, phase advance
• Derivatives: crossing angles, beam separation, 
• Bunch by bunch derivatives: transverse position along a batch, 

Going to have to deal intelligently with the parts of the two rings in common, the various separation and crossing-angle bumps plus spectrometer magnet compensation etc.

1000 turn:

• archive, display, analysis

Acquisition

Going to need

• first turn trajectory - do the crates need to know what intensity is coming?  [bunch selection, average over all bunches]
• first turn trajectory of injected batch with beam circulating already
• first N turns trajectory
• orbit via CMW and concentration - options: beam 1 & 2, average, bunch selection. Timing event triggered acquisition (ramp etc.)
• 1000 turn: lots of options - trigger acquisitions - sync. with RF, sync. with TFB

Latency of around 1 second acceptable.

1. CMW request to "concentrator" including parameter list - subscribe.

2. Concentrator takes responsibility for issuing TTC request. Concentration of data will be done in LSA middle tier.  Parameters to be established e.g. Batch/Bucket Number/Ring. Preloaded front-end settings will need to be invoked. Could well be a request automatically issued for each injection.

3. Concentrator subscribes (CMW) to all BPM crates and takes responsibility for pulling all BPM readings together and re-publishing.

Diagnosis of individual BPMs

Dedicated application

Integration with real-time channel ------ think this one through