Present: Bren, Hannes, Thibaut, Nicolo, Reyes, Piotr, Christian, Verena, Gian Piero, Alex, Tom, Marek, Matt, Alvaro, Rogelio,...
Draft LEIR FS defined, has baseline and option for upgrade. 4 mm kick amplitude and 192 ns rise/fall time with variable flat-top are adequate, improved performance with 8 mm and 135 ns.
Layout options to define (Nicolo, Reyes) and ABT to investigate basic configurations to meet kick requests in the specific locations (Alvaro, Bren, Thomas).
Draft PSB FS also defined, 5 mm at flat-top would be enough for 25 mm at injection to measure non-linearities.
Look at the real needed rise time with a realistic ‘optics’ bunch (Hannes, Piotr, GP).
Other techniques exist with kick response or AC Dipole (ACD) operation of TFB.
Check the amplitude of the correctors needed to get same linear optics measurement resolution (Piotr), and also the damper power needed for same resolution with ACD measurement (Piotr) – bearing in mind can measure 100x more turns with ACD, and can measure in orbit mode with kick response, with lower noise floor.
One major limit is 90 deg. phase advance. Would need more pick-ups…. important to quantify the difference in accuracy between 3 methods.
Look at possible use of PSB extraction kicker for H plane based on PS experience with KFA45, although expected to be complicated (Bren, Matt).
Agreed that 1 kicker per plane per ring is needed, but that no need for separate generators (if this is an advantage for ABT).
ABT to investigate basic configurations to meet kick requests in available locations (Alvaro, Bren, Thomas).
AD no chance to make turn by turn because of low bunch intensity.
ELENA can make turn by turn measurements with few 10ths of mm, used for correcting injection oscillations.
Optics measurements usually made with CO correctors, advantage to also measure at corrector location. This has also been used in SPS and LHC.
Added after the meeting: A side effect of efforts during the design of the ELENA pick-ups to use the sum signal for Schottky diagnostics is that the quality of the analog signal is good enough to obtain single pass precision of a few 10ths of a mm. This has been used to quantify and correct injection oscillations (analysing traces taken with OASIS). The digital electronics used and the FESA class do NOT provide turn-by-turn data.
PS nice list of the techniques, use KFA45 for the H plane at all energies, tricky and maybe some MP considerations to evaluate.
Missing vertical excitation...propose to also draft requirements along lines of PSB/LEIR (Alex, Matt)
SPS have stronger MkQ kickers, check the kick amplitude available at 450 GeV (Bren, Hannes), optics not measured (yet) at top energy.
MKQ also very important for tune measurement at transition crossing etc., and for FT ions.
Also use chirp from the damper away from transition.
Mis-use of inj/extract kickers for at least getting one plane – concerns on fall times and pulse length, and interlocking could be a general issue, deserves some discussion (Matt, Verena, Etienne)
Agreed another meeting next week same time
Basic parameters for PSB and LEIR kickers (Alvaro?)
Comparison of strengths needed for measurement techniques in PS (Piotr?)
PS needs for V plane (Alex?)
Interlocking concerns for mis-use of inj/extr kickers in LEIR/PS/PSB (Verena?)