SLAC workshop 7-10 July 2009WP1: microwave based accelerators

Status of CLIC X-band high-powercomponents

G. Riddone, 08.07.2009

(contribution from A. Olyunin and I. Syratchev)

OverviewAreas Type Design Supplier Ordered

Conventionaldevices forseveral areas

50 dB directional couplers3 dB hybrid3 dB H-plane splitterDry stainless steel RF load

Waveguide E/H bendsRF flanges (CERN design)

GycomCERNCERNCERN

CERNCERN

GycomCINEL, IHEPVDLVDL, CINEL, Heeze

SeveralCINEL

10151015

5

TBTS Attenuator/splitter (0->1)RF phase shifter (360 °)

GycomGycom

GycomGycom

31

Stand alonepowersource, PSI.

H10 -> H01 mode converter

RF/vacuum valve (A. Grudiev)

Gycom/SLACSLAC

Both RF andmechanical designexist at 11.4 GHz

CEA/Saclay

PETS on-off 3 port waveguide junction (T-splitter)contact free high power movable short circuittunable reflector RF network

CERN Under design

CLIC Module Choke mode flange CERN CERN 2

Components needed for several collaborators: KEK and SLAC, as well asPSI (XFEL), Trieste (Elettra), TERA foundationGR, 7/8/2009 2

Directional couplers

3

First order completed (10 units)

New specification underpreparation (aim at morecompact design) for 5 additionalunits to covers needs from thecollaborators

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Dry stainless steel RF loads

10 loads received from CINEL and VDL (materialAISI316LN)

To improve performance changed materialmagnetic stainless steel SS430 – 5 additionalloads from CINEL and Heeze under fabrication(2 available at CERN for testing at KEK/SLAC)

3rd order will have to be foreseen forcollaborators

The two halves of the load

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3 dB H-plane splitters

5

order completed (10 units)

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Two-beam test stand in CLEX

PETS tank

A number of RF components: directionalcouplers, loads, variable splitter and phaseshifter have been installed and now underoperation in the TBTS, CLEX at CERN

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Attenuator (Variable high powerRF power splitter)

Phase shifter (Variable high power RF phase shifter)

Attenuator/phase shifter

7

S parameters at the position of the max (blue) and min (red) coupling

11.7 11.8 11.9 12 12.1 12.230

20

10

0

Frequency,GHzS1

2, d

B

20

F

order completed (3 attenuatorsand 1 phase shifter)

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12 GHz stand alone RF power sourcewaveguide network layout

I. SyratchevGR, 7/8/2009 8

11.4 GHz Gate valve(Grudiev type)SLAC design – rescaledto 12 GHz

11.4 H10 -> H01 mode converterSLAC design

H10 -> H01 mode converterCERN design (needed for PETS on-off)

12 GHz stand alone RF power sourcewaveguide network layout

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To allow the independenttransverse alignment of thetwo linacs in CLIC, the special,contact-free choke modeflanges (CMF) are planned tobe used

Dynamic range for the acceptedperformance (S11< -45 dB)

X – shift: ± 0.25 mm

Y – shift: ± 0.5 mm

Z – shift: ± 0.5 mm

Twist: < 50

CMF

xy

CLIC waveguide networkCLIC two-beam module

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11 11.2 11.4 11.6 11.850

40

30

20

10

0

Frequency, GHz

S11,

dB

F1

11.424 GHz choke mode flangeprototype (2 units) – no adjustmentcapability

CLIC waveguide network

CMF

high

pow

er t

ests

at

SLA

C(A

pril/

May

200

9)

Next step11.424 GHz chokemode flange withadjustment capability isunder design

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ConclusionsAn extensive program for X-band RF waveguides componentsdevelopment have been established in CERN.We have designed, fabricated and received all the components necessaryto start the high RF power operation of the TBTS and the first stage of theTBL. A number of them are already installed and are in operation.First loads in SS43 for KEK and SLAC available in the coming weeks.New simplified designed for the PETS on-off mechanism (based on provencomponents) is under way. The test in the TBTS is foreseen 1Q 2010Recently, in Europe, the X-band activity has significantly grown. Thenumber of Labs have expressed their interests in using the X-bandtechnology for their needs. New orders have been launched to coverneeds from different collaborators.

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