A longitudinal damper for the PS (preliminary ideas) 24 April 20121M. Paoluzzi BE/RF.

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Presentation transcript:

A longitudinal damper for the PS (preliminary ideas) 24 April 20121M. Paoluzzi BE/RF

24 April 2012M. Paoluzzi BE/RF2 Specifications Just some basic specifications are now available for the PS longitudinal wide-band kicker. The lowest mode to be damped is at the revolution frequency : ~400 kHz The highest is half the bunch frequency : ~5 MHz The RF voltage required is of the order of :~5 kV. As the feedback will damp several modes simultaneously, RF voltage will be generated at several f rev harmonics (i.e. synchrotron frequency side-bands) simultaneously. The kicker impedance should be comparable with that of a C10 cavity (~150 Ω) To not jeopardize beam stability in case of problems, the cavity must be equipped with gap short-circuits.

24 April 2012M. Paoluzzi BE/RF3 Use broadband LEIR cavity Performances almost compatible. Low frequency voltage increasable limiting the duty-cycle (i.e. 4kV at 50% ) Gap voltage increasable with adding additional cores (8 instead of 6). One power amplifier already available! FrequencyMHz Nominal gap voltagekV2444 Cavity powerkW Cavity R gap  Cavity |Z gap |  Max power densityW/cm Average power densityW/cm

24 April 2012M. Paoluzzi BE/RF4 Voltage improvement with low loss Finemet ® (FT3L). With the new low-loss Finemet ® type FT3L higher voltages can be achieved. Core losses (R P ) are proportional to µQf. Almost a factor 2 improve achievable with FT3L! Kindly provided by Dr. Chihiro Ohmori (KEK)

24 April 2012M. Paoluzzi BE/RF5 Wideband system capacitance compensation. With the low-loss Finemet ® R P increases but the system capacitance stays constant. To make full use of the Finemet ® wideband properties it is essential to use different capacitance compensation approach. High wideband impedance seen by the beam!!! Need some kind of cancellations scheme.

24 April 2012M. Paoluzzi BE/RF6 Use broadband PSB cavity Frequency coverage compatible with requests. Modular system providing ~700V per cell. Voltage limited by the power amplifier Easily increasable to 1kV. Existing design for 5 cells system. … but: Are solid-state components admissible in the PS machine? Can the required power be provided by solid-state amplifiers.

24 April 2012M. Paoluzzi BE/RF7 Planning. Spring-Summer 2012 : Preliminary study Identify location Select technology Evaluate radiation damage risks Autumn-Winter 2012 : System design Cavity electrical design (Collaboration established with KEK and J-PARC) Power sections and ancillary electronics design Spring-Summer 2013 : Procurements and manufacturing Autumn-Winter 201: Assembly and tests Beginning 2014 : Installation