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LINAC 4 Emittance Meter. Linac 4 Emittance Meter. 1er design for commissioning of the source Slit Sem -grid Measurement plate (F.C.) Emittance meter Upgrade of the slit for 3Mev New slit. SLIT. SLIT 0.1 mm Stainless steel plate: thickness 1 mm with 0.2 mm at the slit position.

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linac 4 emittance meter1
Linac 4 Emittance Meter
  • 1er design for commissioning of the source
  • Slit
  • Sem-grid
  • Measurement plate (F.C.)
  • Emittance meter
  • Upgrade of the slit for 3Mev
  • New slit

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

slide3
SLIT

SLIT 0.1 mm

Stainless steel plate: thickness 1 mm with 0.2 mm at the slit position

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

sem grid
SEM-GRID

48 wires 40 µm Tungsten space 0.75 mm

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

sem grid1
SEM-GRID

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

sem grid2
SEM-GRID

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

sem grid3
SEM-GRID

Polarized plate

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

sem grid4
SEM-GRID

Angle setting

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

measurement plate f c
Measurement plate (F.C.)

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

measurement plate f c1
Measurement plate (F.C.)

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

measurement plate f c2
Measurement plate (F.C.)

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

emittance meter
Emittance Meter

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

emittance meter1
Emittance Meter

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

emittance meter2
Emittance Meter

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

emittance meter3
Emittance Meter

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

emittance meter4
Emittance Meter

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit design
New Slit Design
  • Slit used at source front-end would reach too high temperatures at 3 MeV and would not be thick enough at 12 MeV
  • New slit design based on
    • Energy deposition: dilute energy deposition density by putting the blade with an angle w.r.t. beam axis
    • Minimize scattering along slit gap: minimize slit thickness
  • New design based on graphite plates with an angle of 15 degreesw.r.t. beam trajectory

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit thermo mechanical calculations en mme
New Slit -Thermo-Mechanical Calculations (EN-MME)

ANSYS Model

Temperature Evolution during multi-shots

Without Cooling

With Cooling

  • Design Completed
  • Fabrication Launched

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

specification
Specification

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit
NEW SLIT

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit1
NEW SLIT

Graphite plate

BEAM

direction

15°

Slit: 0.1 mm or 0.2 mm

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit2
NEW SLIT

wedge to adjust by machining after metrology measurement

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit3
NEW SLIT

Additional graphite plates needed to cover the whole beam during the measurement

Five set of plates are ordered (3 spares)

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit4
NEW SLIT

The back copper support of the graphite plate integrate the cooling circuit hole

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit5
NEW SLIT

Two side plate close the cooling circuit.

In the assembly, it is the only position where a brazing separate vacuum from the water of the cooling circuit

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit6
NEW SLIT

Fixation of the graphite plate on the support

Thickness at the slit position : 1 mm

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit7
NEW SLIT

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit8
NEW SLIT

Horizontal et vertical slit

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit9
NEW SLIT

Stepping motor:

200 step / turn

Horizontal et vertical slit movement with potentiometer

Manipulator

1.27 mm/turn

=> resolution 6.35 µm / motor step

Sliding support

Window for laser profile measurement

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit10
NEW SLIT

Slope setting with the back micrometric screw

0.25 mm/ turn

Tilt setting with the 2 front screw

Potentiometer will be added to the micrometric screw to be able to keep the position of the alignment setting

BEAM

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

tilt setting
TILT setting

Is done with a optical bench

The slit assembly is installed in the tank

The tank is aligned to a optical bench (the survey target and the tilt reference plate are set).

The assembly will be under vacuum.

By acting on the 2 front micrometric screw the slit will be aligned

For the slope setting the assembly will stay on the same bench and under vacuum but a laser will replace the optical system.

Several iteration by acting on

the 2 micrometric srew

until getting the slit horizontal

Horizontal ref of the optical system

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

slope setting
Slope setting

Setting the position of the slit by action on the back screw

Laser beam sensor

LASER BEAM

Vertical movement of the laser

Mechanism under vacuum

Several iteration until getting the maximum value at the laser beam sensor

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit11
NEW SLIT

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

new slit12
NEW SLIT

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

budget new slit
Budget new slit
  • Design: 93 kCHF
  • Manufacturing: 150 kCHF (88 kCHF + 60 KCHF)
  • Total: ~250 kCHF

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

slide36
Some pictures

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

slide37
GEFRAN PKM175 Répétitivité : 0.01 mm

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

planning
Planning
  • AP : delivery of the mechanical part earliest end of November.
  • The supply partsare already at CERN except water flow, screw...
  • Planning (working days):see next slide

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

planning1
Planning
  • 1. Assembly of the graphite plate, metrology lab, machining of the wedge, cleaning, reassembly and remetrology lab:

7 days

  • 2. Assembly of the 2 slit out of the tank:

10 working days

  • 3. Assembly of the tank with the setting support on the optical alignement bench and alignment:

3 working days

  • 4. Assembly of the 2 slits inside the tank:

2 working days

  • 5. Tilt alignment of the 2 slits:

2 working days

  • Slope alignment of the 2 slits (not usual, probably with laser and captor):

3 working days

  • Check of the alignment and survey alignment

2 working days

Mechanical assembly finish: 29 working days

But the position setting and check of the movement for the soft and hardware electronic needed to be done with the slit assembly on the optical alignment bench and with the support of the ML section

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

planning2
Planning
  • If the delivery from the AP (Main Workshop) is end-of November
  • 25/01/2012 the new slit will be ready (mechanical)
  • BUT in parallel the Winter Shut Down !!!

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

slide43
Thanks to:
  • F. Roncarolo, B. Cheymol
  • B. Riffaud, E. Berthome, D. Steyaert, A. Dallochio
  • G. Favre, S. Mathot
  • M. Duraffourg, G. J. Focker
  • ....and all other people involved in this project

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

question
Question?
  • Thank for your attention
  • Question?

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

cut view
Cut view

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

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