13 th April 2007FFAG 07 Carl Beard EMMA RF System, Costs Carl Beard, ASTeC, Daresbury Laboratory

13 th April 2007FFAG 07 Carl Beard EMMA RF Specification Machine ParametersValue Frequency (GHz)1.3 Number of Straights21 Number of Cavities19 Total Acc per turn2.3 MV Upgrade Acc per turn3.4 MV Beam Aperture40mm RF Bunch Length1.6 ms RF Repetition rate10 Hz Phase Control0.02 o Amplitude Control2x10 -4

13 th April 2007FFAG 07 Carl Beard Proposed Cavity Design ParameterValue Frequency (GHz)1.3 Shunt Impedance (M  ) 4.3 Realistic (80%)3.44 Qo23,000 R/Q120 Tuning Range (MHz) +1.5MHz to - 4MHz V acc (kV) P diss (kW) P tot incl 30% Overhead * (kW) Cavity Cost (£10k x 20)£200k

13 th April 2007FFAG 07 Carl Beard IOT Options PSU, Controls and Pre-amp required for CPI/Thales IOT (integrated Amplifier is being developed) 20 kW e2v IOT30 kW CPI/Thales IOT Number of RF Cavities19 Number of RF Power Sources3624 Cavity Rsh (M  ) 3.4 Vacc/Cavity (kV) Cavities/RF power source2x6 / 1x75x3 / 1x49/103x5 / 1x4 RF Power/Cavity (incl o/h) (kW) Distribution and Control Overhead (%) 30 Total Ring RF Power (kW) Max Ring Power Available (kW) RF Power Overhead (kW)

13 th April 2007FFAG 07 Carl Beard Klystron Options 160kW (possibly 170 kW) klystrons are available from e2v PSU, Pre-amp, Cooling systems required PSU Requirements - 45kV, 5.8A (SRS PSU) Klystron 120 kV Option Klystron 180 kV Option Number of RF Cavities19 Number of RF Power Sources11 Cavity Rsh (M  ) 3.4 Vacc/Cavity (kV) Cavities/RF power source199/10 RF Power/Cavity (incl o/h) (kW) Distribution and Control Overhead (%) 40 Total Ring RF Power (kW) Max Ring Power Available (kW)160 RF Power Overhead (kW)78.3 (60%)44.1 (42%)

13 th April 2007FFAG 07 Carl Beard Cost for Power Sources + PSU Single#120 kV#180 kV RF Power Overhead (180kV) e2v Amplifier*£120k3£360k6£720k4.1% e2v IOT£30k3£90k6£180k4.1% HighP IOT£35k2£70k4£140k4.3% Pre-amps £20k2£40k4£80k New PSU £500k SRS PSU Upgrade £200k e2v Klystron † £250k1 1 50% *Does not require PSU † Using SRS PSU, 2 nd Klystron is recommended, out of spec Cornell klystron could reduce the capital cost.

13 th April 2007FFAG 07 Carl Beard Cost options Power Source + PSU Single#120 kV#180 kV Total Cost (120 KV) Total Cost (180 kV) e2v Amplifier*£120k3£360k6£720k£360k£720k HighP IOT +pre- amp +SRS PSU £35k2£110k4£220k£310k£440k e2v Klystron † £250k1 1

13 th April 2007FFAG 07 Carl Beard 7dB Cascaded Distribution 3-Stub Tuner %33%25%20%16.6%14.3% 3 dB4.8 dB6 dB7 dB7.8 dB8.4 dB 3dB 4.8dB 6dB IOT The same regardless of number of splits. Compact System Single Cavity Amplitude Phase and Amplitude not possible Klystron option similar (1 Klystron feeds all 19 cavities) Load Circulator

13 th April 2007FFAG 07 Carl Beard 7dB Split Distribution IOT Fewer Circulators are required Odd Number splits complicate the system. Single Cavity Amplitude Phase and Amplitude not possible Large Waveguide Distribution 3dB

13 th April 2007FFAG 07 Carl Beard Ancillary Equipment Unit Price CascadeCostSplitCost6 IOT Split Cost WG Loads (20 kW) £ £25k7£17.5 Waveguide (1m+flanges) £500/m40m£20k40m£20k40m£20k WG – Bends£40040£16k40£16k40£16k Isolator£240020£48k10£24k6£14.4k 3-Stubb tuner£200020£40k20£40k20£40k Transitions WG 2 Co £200020£40k20£40k20£40k Coaxial Cable£50/m40£2k40£2k40£2k Total£166kTOTAL£167kTotal£150k

13 th April 2007FFAG 07 Carl Beard LLRF Distribution Master Oscillator Amplitude Control SS Amp IOT Phase Shifter Mixer In the combined systems only takes feedback from a single cavity Phase control of the cavity group is possible Individual IOTs for each cavity required for separate Amplitude and Phase adjustment The string of cavities would be phased locked to the control cavity Comparator Level Detector Comparator Costs Based on ERLP system New system required to be developed. TTF System closer to what we need

13 th April 2007FFAG 07 Carl Beard RF System Costs (Minimum) Cavity£200k RF SourceIOT£440k Klystron£250k x2 RF Distribution£170k LLRF£???k Klystron option Total£620k (£250k) IOT Option Total£810k

13 th April 2007FFAG 07 Carl Beard Summary Prototype Cavity needs manufacturing and tendering Klystron Option is the cheapest –larger overhead and no need to reconfigure distribution –Spare Klystron should be ordered –If we order ASAP, costs will be reduced Cascaded RF Distribution would be the optimum since space is valuable. –Costs alter little between options LLRF System needs developing (TTF System is close to what we need)