rossana bonomi alberto degiovanni marco garlasch silvia verd andr s n.
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5.7 GHz high gradient test cavity - PowerPoint PPT Presentation


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Rossana Bonomi , Alberto Degiovanni, Marco Garlasché , Silvia Verdú Andrés. 5.7 GHz high gradient test cavity. Outline. High gradient test goals and program RF design Structural design Tolerances and tuning Open issues. TERA high gradient program. 3. Design overview.

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Presentation Transcript
slide2

Outline

  • High gradient test goals and program
  • RF design
  • Structural design
  • Tolerances and tuning
  • Open issues

TERA Foundation

design overview
Design overview

Accelerating cell @ 5.7 GHz

(two unsymmetrical half cells)

RF H-coupling system

(waveguide, short circuit)

Cooling system

(3 plates, in-out pipes)

Connection to data acquisition

(through CF flanges)

TERA Foundation

power source
power source

TERA Foundation

rf design

RF Design

TERA Foundation

cavities comparison

2.0

18.8

15.8

17.39

1.0

1.0

25°

7.47

1.0

1.5

Cavities comparison

All values in mm !

TERA Foundation

separate e max and s c max
separate Emax and Sc,max

InnerNose Radius

OuterNose Radius

Flat Nose

TERA Foundation

separate e max and s c max1
separate Emax and Sc,max

Power and Surface Electric Field scaling:

E0,norm=33 MV/m

TERA Foundation

cavities comparison1

3.0

18.8

15.8

17.34

1.0

3.0

20°

8.0

1.0

1.5

Cavities comparison

All values in mm !

TERA Foundation

parameter list for test
Parameterlistfor test

TERA Foundation

slide12
mesh
  • Max. elementlength for:
  • Cell………………... 3 mm
  • Coupler …………. 2 mm
  • WG ……………….. 10 mm
  • Max. surf. deviation for:
  • Cell……………… 0.01 mm
  • Coupler ……… 0.01 mm

TERA Foundation

cavity parameters
cavity parameters

TERA Foundation

slot dimensions
slot dimensions

Short-circuit

TERA Foundation

field asymmetry
field asymmetry

N

W

E

S

TERA Foundation

structural design

Structural Design

TERA Foundation

struct design halfcells
Struct. design: halfcells

Two unsymmetrical halfcells:

- easier brazing

- no spikes in slot

Outerdimensions: 48.9 x 45.9mm

C_factor = 1.5

Tuning range ≈ 20 MHz

TERA Foundation

struct design halfcell 1 tuning
Struct. design: halfcell #1- tuning
  • Small cell diameter and brazing position do not allow controlled dimple tuning
  • Presence of tuners in standard linacs for med. treatment

Tuning done through 3 tuners diametrically inserted in cavity.

Øtuners ~ 2 - 3 - 4 mm

TERA Foundation

struct design halfcells brazing
Struct. design: halfcells’ brazing

Enlarged flanges (CF 34/16) for structural resistance during brazing (Øext= 39mm)

TERA Foundation

struct design waveguide flanges
Struct. design: waveguide+flanges

Brazing:

Waveguide: - WR 187 thickwalled

(ID : 1.872 x 0.872 in – OD: 2.122 x 1.122 in)

- C10100 copper

Flanges: - FDP48-FDM48 standard*

- 316LN stainless steel

TERA Foundation

struct design cooling plate
Struct. design: cooling plate

Pulsed Surface Heating

TERA Foundation

struct design cooling plate1
Struct. design: cooling plate

C10100 Copper

Tuners  covering plate

316L stainless steel with Ni+Cu coating

TERA Foundation

tolerances and tuning

Tolerances and Tuning

TERA Foundation

tolerances
tolerances

r

1

2

3

4

5

6

9

7

8

z

TERA Foundation

tuning sensitivity
tuning sensitivity

TERA Foundation

field asymmetries
field asymmetries

3 tuners: Ø = 3-3-4 mm

penetration = 3 mm

Δf = + 22 MHz

TERA Foundation

open issues
Open Issues
  • Prototype components:
    • any info on FDP-FDM standard
  • Test components:
    • advice on instrumentation needed, dimensions, weight, C to S band transition…
      • Faraday cup
      • Optical spectrumanalyzer
      • Thermal sensors, flowmeter, manometer..
    • RF pick-up
  • Further tests:
    • Two more prototypes brazed @ 1040˚ under Nitrogen, need support on:
      • geometry definition (holes, thicknesses, stresses & deformations)
      • production process definition (tolerances..)
      • brazingprocessdefinition(process sponsoring, brazing material, logistics..)

TERA Foundation

acknowledgments
acknowledgments

Thank you

for all advice, discussions and help for our project

Thank you

for scheduling our meeting today

to be continued….

28

TERA Foundation