ICE workshop25-27/10/20011R. Garoby

88 MHz RF STATUS

OUTLINEOUTLINE

1. Parameters of the 88 MHz RF in the muon 1. Parameters of the 88 MHz RF in the muon cooling channelcooling channel

2. Status of the high gradient test set-up2. Status of the high gradient test set-up

3. Preliminary parameters of an 88 MHz option 3. Preliminary parameters of an 88 MHz option for ICEfor ICE

ICE workshop25-27/10/20012R. Garoby

1. Parameters the 88 MHz RF in the muon cooling channel

E0T = 4 MV/m = 159 s solenoid: 40 x 20 cmZTT = 7 M/m PPEAK = 2.04 MW/cavity Kilpatrick: 2.3R/Q = 144 PMEAN = 49 kW/cav. for 50 Hz repetition rate

beam tube 15 cm

90 cm unit length

84 cm

37 cm

beam axisconnection between units

SC solenoid SC solenoid

15 cm: mounting & solenoid supply

ICE workshop25-27/10/20013R. Garoby

22

02

.

20

,

TP

VTrr

f

Q

r

VP

wallS

cavSwall

r

Q

f

fTVP

cav

repmean

2203

volumelarge gap, large ,

CL

C

L

Q

r

andusing

Power efficiency optimization

ICE workshop25-27/10/20014R. Garoby

High gradient at low frequency

(Kilpatrick: 2.3) sparking: tests (high) magnetic field lines penetrating the

cavities multipactor: computations & tests large cavity dimensions mechanical

stability: computations field emission induced by lost particles

cavity test with beam.

Challenges:

ICE workshop25-27/10/20015R. Garoby

2. Status of the high gradient test set-up

Original system: PS 114 MHz RF cavity for leptons

ICE workshop25-27/10/20016R. Garoby

88 MHz test cavity(made from an 114 MHz structure)

Closed gap case

E0 = 4 MV/m

frep = 1 Hz

r/Q = 113 = 180 stpulse , frep = 1 ms, 1 Hz

Ppeak = 1.4 MW

Pmean = 1.4 kW

Kilp. = 2.3gap = 280 mmlength = 1 mdiameter= 1.77 m

Open gap case

E0 = 4 MV/m

frep = 1 Hz

r/Q = 107 = 180 stpulse , frep = 1 ms, 1 Hz

Ppeak = 1.5 MW

Pmean = 1.5 kW

Kilp. = 2.3gap = 260 mmlength = 1 mdiameter= 1.77 m

ICE workshop25-27/10/20017R. Garoby

2 MWamplifier

88 MHzcavity

NoseCone

(closed gap)

88 MHz test cavity(made from an 114 MHz structure)

ICE workshop25-27/10/20018R. Garoby

88 MHz test system status and planning

STATUS (October 2001)STATUS (October 2001) DEADLINEDEADLINE

Test place Test place infrastructureinfrastructure

In preparation [A. Marmillon]In preparation [A. Marmillon] 15/11/200115/11/2001

Power suppliesPower supplies Ordered [J.P. Royer]Ordered [J.P. Royer] 15/11/200115/11/2001

RF drivers (200 kW)RF drivers (200 kW) In preparation [D. Grier, C. Rossi]In preparation [D. Grier, C. Rossi] 1/12/20011/12/2001

RF amplifier (2 MW)RF amplifier (2 MW) In preparation [M. Vretenar]In preparation [M. Vretenar] 1/12/20011/12/2001

CavityCavity Ready (closed gap) [F. Gerigk]Ready (closed gap) [F. Gerigk] --

SolenoidsSolenoids In negociation with CEA (Saclay)In negociation with CEA (Saclay)

[J.M. Rey, A. Dael][J.M. Rey, A. Dael]

12/2002 ?12/2002 ?

SUMMARYFirst turn-on of the complete amplifier chain: 12/2001Setting-up on dummy load: 03/2002High gradient in the cavity: 05/2002Increase of RF power: 10/2002 ?Test with solenoid: 12/2002 ??

ICE workshop25-27/10/20019R. Garoby

3. Preliminary parameters of an 88 MHz option for ICE

Sketch of a 4 cavities module

ICE workshop25-27/10/200110R. Garoby

Repetition

rate Nb. of

cavities Peak RF

gradient

Peak RF power

Pulse duration

(RF/beam)

Mean RF

power

Power from mains

(= cooling needs) 4 14.4 MV 8.2 MW 0.6/0.1 ms 250 kW 0.5 MW

50 Hz 2 x 4 28.8 MV 16.4 MW 0.6/0.1 ms 500 kW 1 MW

4 14.4 MV 8.2 MW 1/0.5 ms 82 kW 0.17 MW 10 Hz

2 x 4 28.8 MV 16.4 MW 1/0.5 ms 164 kW 0.35 MW

Electrical power and cooling needs for the 88 MHz option in ICE

=> Advantage of the 10 Hz option

Overall needs in infrastructure: H. Ullrich