8th ESLS RF Meeting – September 2004

RF System 1/23

Storage RingRF System

F. Perez

8th ESLS RF Meeting – September 2004

RF System 2/23

Contents

• Power Requirements• Transmitter Options• Low Level Electronics Approach

• Voltage Requirements• Cavity Comparison

8th ESLS RF Meeting – September 2004

RF System 3/23

Power Requirements

Beam current 400 mA

Bending losses 950keV/turn

ID losses 300 keV/turn

Other losses 50 keV/turn

Total losses 1300 keV/turn

Beam power 520 kW

Energy Acceptance3 %

8th ESLS RF Meeting – September 2004

RF System 4/23

Transmitter

• TWO power escenarios:– ~150 kW– ~300 kW

• THREE transmitter type escenarios– High Power Klystron– IOT combination– Solid State Amplifier

8th ESLS RF Meeting – September 2004

RF System 5/23

Transmitter

For the case of ~300 kW IOT combination, we want to produce a combiner cavity prototype:

E. Wooldridge, ASTeC

Can also be used as a SSA combiner…

8th ESLS RF Meeting – September 2004

RF System 6/23

Low Level Electronics• IQ (DE)MODULATION

• Digital or analogue

A. Rohlev et al., CERN

8th ESLS RF Meeting – September 2004

RF System 7/23

Voltage Requirements

For 3% RF Energy Acceptance

1,5

2

2,5

3

3,5

4

0 200 400 600

Frequency [MHz]

RF

Vo

ltag

e [

MV

] .

8th ESLS RF Meeting – September 2004

RF System 8/23

Cavity

• NC 100 MHz MAXlab

• NC 180 MHz BNIP

• SC 352 MHz SOLEIL

• NC 500 MHz ELETTRA, UE, …

• SC 500 MHz CORNELL

8th ESLS RF Meeting – September 2004

RF System 9/23

Cavity 100 MHzTotal Voltaje 2.0 MV

No Cells/IPC 10

Type of cavity nc

Voltage / cell 200 kV

Rshunt 1,6 M

Cavity power 12,5 kW

Beam power/cav 52kW

IPC power 65 kW

Amplifier Power80 kW

Total Power 800 kW

REJECTED : 10 ARE TOO MANY CAVITIES

8th ESLS RF Meeting – September 2004

RF System 10/23

Cavity 180 MHzTotal Voltaje 2.4 MV

No Cells/IPC 4

Type of cavity nc

Voltage / cell 600 kV

Rshunt 4.3 M

Cavity power 42 kW

Beam power/cav 130kW

IPC power 172 kW

Amplifier Power180 kW

Total Power 720 kW

8th ESLS RF Meeting – September 2004

RF System 11/23

Cavity 180 MHz

REJECTED : TOO MANY HOMs

HOMs

8th ESLS RF Meeting – September 2004

RF System 12/23

Cavity 352 MHzTotal Voltaje 3.0 MV

No Cells/IPC 2 4

Type of cavity sc

Voltage / cell 1500 750 kV

Rshunt 4500 M

Cavity power 0 0 kW

Beam power/cav 260130 kW

IPC power 260 130 kW

Amplifier Power300 150 kW

Total Power 600 600 kW

ON STANDBY : ONE modul is too less and TWO too much …

8th ESLS RF Meeting – September 2004

RF System 13/23

Cavity 500 MHz (1)Total Voltaje 3.6 MV

No Cells/IPC 6

Type of cavity nc

Voltage / cell 600 kV

Rshunt 3.4 M

Cavity power 53 kW

Beam power/cav 87kW

IPC power 140 kW

Amplifier Power160 kW

Total Power 960 kW

1st OPTION

8th ESLS RF Meeting – September 2004

RF System 14/23

Cavity 500 MHz (2)Total Voltaje 3.6 MV

No Cells/IPC 6

Type of cavity nc

Voltage / cell 600 kV

Rshunt 3.0 M

Cavity power 60 kW

Beam power/cav 87kW

IPC power 147 kW

Amplifier Power160 kW

Total Power 960 kW

2nd OPTION

8th ESLS RF Meeting – September 2004

RF System 15/23

Cavity 500 MHz (3)Total Voltaje 3.6 MV

No Cells/IPC 2

Type of cavity sc

Voltage / cell 1800 kV

Rshunt 4500 M

Cavity power 0 kW

Beam power/cav 260kW

IPC power 260 kW

Amplifier Power300 kW

Total Power 600 kW

3rd OPTION

8th ESLS RF Meeting – September 2004

RF System 16/23

Cavity Comparison

(1) ELETTRA (2) EU (3) CORNELL

DC POWER 2.5 MW 2.6 MW 2.1 MW

WATER COOLING

220 m3/h 230 m3/h 140 m3/h

Cavity Wall Dissipation

Cavity Wall Dissipation

Refrigerator

8th ESLS RF Meeting – September 2004

RF System 17/23

Cavity Comparison

(1) ELETTRA (2) EU (3) CORNELL

SPACE 2 x 2.9 m 2 x 2.9 m 2 x 3.3 m

3 cavities in one 4 m straight

3 cavities in one 4 m straight

1 cavity in one 4 m straight

COST ESTIMATION

9.3 M€ 9.9 M€ 10.6 M€

6 x 1.55 M€ 6 x 1.65 M€ 2 x 5.1 M€

8th ESLS RF Meeting – September 2004

RF System 18/23

Cavity Comparison

RUNNING COST DIFFERENCES

(1) ELETTRA (2) EU (3) CORNELL

INVESTMENT - 600 k€ 1300 k€

DC POWER 400 kW 500 kW -

RUNNING (10y) (6000 h/year)

2400 k€ 3000 k€ -

MAN POWER (10y)(1.5 man/year)

- - 900 k€

OVER 10 YEARS +300 k€ +900 k€ -

SPACE, SERVICES and COST are NOT DECISION FACTORS

8th ESLS RF Meeting – September 2004

RF System 19/23

Comparison: Longitudinal HOMs

0,01

0,10

1,00

10,00

100,00

1000,00

500 1000 1500 2000 2500 3000

Freq [MHz]

Lo

ng

Imp

ed

an

ce [k

Oh

m]

ZII Threshold

ELETTRA/6

EU

SC/3

Stability threshold for 400 mA

8th ESLS RF Meeting – September 2004

RF System 20/23

Comparison: Transverse HOMs

Stability threshold for 400 mA

0,1

1,0

10,0

100,0

1000,0

500 700 900 1100 1300 1500 1700 1900

Freq [MHz]

Tra

nsve

rse

Impe

danc

e [k

Ohm

/m]

Zy Threshold Zx Threshold

ELETTRA/6 EU

CORNELL

8th ESLS RF Meeting – September 2004

RF System 21/23

HOMs comparison(1) NC ELETTRA

Needs: SC 3rd Harmonic Cavity

Transverse Feedback

(2) NC UENeeds: SC 3rd Harmonic Cavity

(3) SC CORNELLNeeds: None

8th ESLS RF Meeting – September 2004

RF System 22/23

Other Considerations3rd Harmonic Cavity is interesting for the 3 cases to

increase the Touschek lifetime

Transverse Feedback will be needed for broadband impedance instabilities in any case, but for the SC option will be simpler

SC option allows larger voltages (larger energy acceptance)

Reliability of the SC systems has to be considered

8th ESLS RF Meeting – September 2004

RF System 23/23

CONCLUSION