What Ive been doing in the last month

What I’ve been doing in the last. . . month • Completed measurements on the LHC – MKI (magnetic kicker injection) with R. Soares, M. Barnes, F. Caspers, E. Metral, Y. Sillanoli • Analysed the data as far as possible at the moment – Derived longitudinal impedance (real/imaginary), driving impedance (real/imaginary), detuning impedance (real only) • Begun simulations of structure using CST particle studio – Only parallel plates for the time being (meshing lossy structures can be problematic) • Reading last years USPAS lectures on “collective effects in beam dynamics” (http: //emetral. web. cern. ch/emetral/ if anyone interested) • Acquired a full set of the schematics for secondary collimators (phase 1/phase 1 with BPM prototype/phase 2 prototype) – Looks to be a lot of detail. Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day

LHC-MKI – What’s measured • Transmission line, NC pulsed magnet • Has impedance reduction in place and similar length reference pipe connected also (important for deriving imaginary impedance Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day

Virtual Network Analyser LHC-MKI in vacuum tank Sucoboxes for connecting wire/capacitors Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day

Measurements Impedance (Ohms/m) 60 Real Longitudinal Impedance 50 Random notes: • Kramers-Kronig (axis crossing of imaginary impedance when peak in real impedance) relation appears to be present, good sign of validity of results. 40 30 20 10 0 0 200 400 600 800 1000 1200 Frequency (MHz) 1400 1600 1800 2000 Imaginary Longitudinal Impedance • Peak at 1300 MHz appears in many areas, possible focus for simulations (of many) 250 Impedance (Ohms/m) 200 150 100 50 0 0 200 400 600 800 1000 1200 1400 1600 1800 -50 -100 • Low imaginary impedance in many section points to impedance reduction working Frequency (MHz) Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day 2000

Measurements contd Impedance (Ohms/m^2) 14000 Real Vertical Driving Impedance 12000 Kramers-Kronig not apparent, vertical plane has a complex geometry and asymmetric screening so might have something to do with it 10000 8000 6000 4000 2000 0 0 200 400 50 Impedance (Ohms/m^2) 800 1000 1200 Frequency (MHz) 1400 1600 1800 2000 Imaginary Vertical Driving Impedance 0 -50 600 0 200 400 600 800 1000 1200 1400 1600 1800 2000 -150 -200 atten -250 no atten -300 -350 -400 -450 Frequency (MHz) Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day

Measurements contd Impedance (Ohms/m^2) 40000 Real Horizontal Driving Impedance 35000 Kramers-Kronig apparent - Good 30000 25000 20000 15000 10000 5000 0 0 200 Impedance (Ohms/m^2) 500 400 600 800 1000 1200 Frequency (MHz) 1400 1600 1800 2000 Imaginary Horizontal Driving Impedance 0 0 200 400 600 800 1000 1200 1400 1600 -500 -1000 -1500 -2000 Frequency (MHz) Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day

Measurements contd Real Detuning Impedance 50000 Impedance (Ohms/m^2) 30000 10000 3 mm 0 200 400 600 800 1000 1200 1400 1600 1800 2000 -10000 -30000 -50000 Frequency (MHz) Appears to be small – Possibility that it is nearly zero -> not present in rotationally symmetric systems. Need to see how far this extends until symmetry broken Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day 6 mm

To be done • MKI • Continue simulations, try and sort out meshing issues and see how close to reality we can get • Try and find a way to derive imaginary detuning impedance -> important for beam dynamics for beam stability/tune shift • Write a summary report when done (may end up being 1 st year transfer report) • Phase 2 collimation studies • Construct model in CST • Check model with A. Bertarelli/A. Dallaccio • Possibility of beam dynamics simulations, will see when further along – get to learn the joys of MAD-X and HEADTAIL • Transfer report • Start writing it • Organise where/when I’ll have the viva (Hywel + who? ). Deadline is the same week as IPAC, so probably needs to be done near the beginning of May • Tacgnol • Possibility of ceiling Manchester Monday Morning Mega. Meeting – 19/04/10 – H. Day