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

13th April 2007 FFAG 07 Carl Beard

EMMA RF System, Costs Carl Beard, ASTeC, Daresbury Laboratory


EMMA RF SpecificationMachine Parameters Value

Frequency (GHz) 1.3

Number of Straights 21

Number of Cavities 19

Total Acc per turn 2.3 MV

Upgrade Acc per turn 3.4 MV

Beam Aperture 40mm

RF Bunch Length 1.6 ms

RF Repetition rate 10 Hz

Phase Control 0.02o

Amplitude Control 2x10-4


Proposed Cavity Design

Parameter Value

Frequency (GHz) 1.3

Shunt Impedance (M) 4.3

Realistic (80%) 3.44

Qo 23,000

R/Q 120

Tuning Range (MHz) +1.5MHz to -4MHz

Vacc (kV) 120 180

Pdiss (kW) 2.1 4.7

Ptot incl 30% Overhead* (kW) 2.73 6.1

Cavity Cost (£10k x 20) £200k


IOT Options• PSU, Controls and Pre-amp required for CPI/Thales IOT

(integrated Amplifier is being developed)20 kW e2v IOT 30 kW CPI/Thales IOT

Number of RF Cavities 19 19 19 19

Number of RF Power Sources 3 6 2 4

Cavity Rsh (M) 3.4 3.4 3.4 3.4

Vacc/Cavity (kV) 120 180 120 180

Cavities/RF power source 2x6 / 1x7 5x3 / 1x4 9/10 3x5 / 1x4

RF Power/Cavity (incl o/h) (kW) 2.73 6.1 2.73 4.7

Distribution and Control Overhead (%)

30 30 30 30

Total Ring RF Power (kW) 51.3 115.9 51.3 115

Max Ring Power Available (kW) 60 120 60 120

RF Power Overhead (kW) 8.7 4.1 8.7 4.3


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

Klystron180 kV Option

Number of RF Cavities 19 19

Number of RF Power Sources 1 1

Cavity Rsh (M) 3.4 3.4

Vacc/Cavity (kV) 120 180

Cavities/RF power source 19 9/10

RF Power/Cavity (incl o/h) (kW) 2.73 6.1

Distribution and Control Overhead (%)

40 40

Total Ring RF Power (kW) 51.3 115.9

Max Ring Power Available (kW) 160 160

RF Power Overhead (kW) 78.3 (60%) 44.1 (42%)


Cost for Power Sources + PSU

Single # 120 kV # 180 kV RF Power Overhead (180kV)

e2v Amplifier* £120k 3 £360k 6 £720k 4.1%

e2v IOT £30k 3 £90k 6 £180k 4.1%

HighP IOT £35k 2 £70k 4 £140k 4.3%

Pre-amps £20k 2 £40k 4 £80k

New PSU £500k £500k

SRS PSU Upgrade £200k £200k

e2v Klystron† £250k 1 £250k 1 £250k 50%

*Does not require PSU

† Using SRS PSU, 2nd Klystron is recommended, out of spec Cornell klystron could reduce the capital cost.


Cost options Power Source + PSU

Single # 120 kV # 180 kV Total Cost (120 KV)

Total Cost (180 kV)

e2v Amplifier* £120k 3 £360k 6 £720k £360k £720k

HighP IOT +pre-amp +SRS PSU

£35k 2 £110k 4 £220k £310k £440k

e2v Klystron† £250k 1 £250k 1 £250k £250k £250k


7dB

Cascaded Distribution

3-Stub Tuner

2 3 4 5 6 7

50% 33% 25% 20% 16.6% 14.3%

3 dB 4.8 dB 6 dB 7 dB 7.8 dB 8.4 dB

3dB4.8dB6dBIOT

•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


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

3dB

3dB


Ancillary Equipment

UnitPrice

Cascade Cost Split Cost 6 IOTSplit

Cost

WG Loads (20 kW)

£2500 0 0 10 £25k 7 £17.5

Waveguide (1m+flanges)

£500/m 40m £20k 40m £20k 40m £20k

WG – Bends £400 40 £16k 40 £16k 40 £16k

Isolator £2400 20 £48k 10 £24k 6 £14.4k

3-Stubb tuner £2000 20 £40k 20 £40k 20 £40k

TransitionsWG 2 Co

£2000 20 £40k 20 £40k 20 £40k

Coaxial Cable £50/m 40 £2k 40 £2k 40 £2k

Total £166k TOTAL £167k Total £150k


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


RF System Costs (Minimum)

• Cavity £200k• RF Source IOT £440k• Klystron £250k x2

• RF Distribution £170k• LLRF £???k

• Klystron option Total £620k (£250k)

• IOT Option Total £810k


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)

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

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