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EMMA RF Systems. RF Cavity Design ELBE Buncher Cavity Redesign for larger iris Implications. Outline. Costings IOT Amplifiers Klystron Option. ELBE RF Cavity. Cavity was designed By Andre Buchner (@ FZR) Optimised for maximum shunt impedance Q = 11900 (13750 calculated) - PowerPoint PPT Presentation
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29th June 2006 EuroFEL DS5 Feedback Carl Beard
EMMA RF Systems
29th June 2006 EuroFEL DS5 Feedback Carl Beard
Outline
• RF Cavity Design– ELBE Buncher Cavity– Redesign for larger
iris– Implications
• Costings– IOT Amplifiers– Klystron Option
29th June 2006 EuroFEL DS5 Feedback Carl Beard
ELBE RF Cavity• Cavity was designed By Andre Buchner (@ FZR)• Optimised for maximum shunt impedance• Q = 11900 (13750 calculated)• R/Q is 103 Ohm.
– This gives 60 W for 12 kV (49 W calculated).
• Water cooling is only on one side. • Frequency -0.33 kHz/W and a heating of 2 deg for
100 W • Temperature stability
– 1 deg (water) caused a frequency shift of 22 kHz.
29th June 2006 EuroFEL DS5 Feedback Carl Beard
ELBE RF Cavity (2)
29th June 2006 EuroFEL DS5 Feedback Carl Beard
Cavity Redesign
• Increase Beam pipe – Reduces shunt impedance– Increase in required RF Power– Input through N-type connector
• Increase in Cooling capacity• Decrease in RF heating• Option to add cooling to other side.• Tuning system should also scale…• Cavity geometry being re-optimised
29th June 2006 EuroFEL DS5 Feedback Carl Beard
Initial Calculations.
Rsh
0.0000E+00
2.0000E+05
4.0000E+05
6.0000E+05
8.0000E+05
1.0000E+06
1.2000E+06
1.4000E+06
1.6000E+06
1.8000E+06
2.0000E+06
20 25 30 35 40 45
Rsh
29th June 2006 EuroFEL DS5 Feedback Carl Beard
IOT Amplifier
• Proposed purchase of 8 IOT transmitters, including– IOT– Power Supplies– Drive Amplifier
• Each Amplifier powers 3 RF cavities• Fast Downtime in the event of IOT failure.• Most parts are production items• More efficient• 8 IOT transmitters is a very Large system
29th June 2006 EuroFEL DS5 Feedback Carl Beard
Klystron Option• A single High Power Klystron could power EMMA ring.• 1 item would be reduction in cost compared to the IOT
system. • Plus reduction in space• High gain device
– Smaller drive amplifier required.
• High Voltage Power Supply Required
• Replacement, equally as expensive.• Long downtime• Few Suppliers• Complicated RF distribution scheme
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