1. 29 th June 2006EuroFEL DS5 Feedback Carl Beard EMMA RF Systems

2. 29 th June 2006EuroFEL DS5 Feedback Carl Beard Outline RF Cavity Design –ELBE Buncher Cavity –Redesign for larger iris –Implications Costings –IOT Amplifiers –Klystron Option

3. 29 th June 2006EuroFEL 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.

4. 29 th June 2006EuroFEL DS5 Feedback Carl Beard ELBE RF Cavity (2)

5. 29 th June 2006EuroFEL 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

6. 29 th June 2006EuroFEL DS5 Feedback Carl Beard Initial Calculations.

7. 29 th June 2006EuroFEL 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

8. 29 th June 2006EuroFEL 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