LINAC 4 Emittance Meter

LINAC 4Emittance Meter

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Linac 4 Emittance Meter

• 1er design for commissioning of the sourceSlitSem-gridMeasurement plate (F.C.)Emittance meter• Upgrade of the slit for 3MevNew slit

LINAC 4 Beam Instrumentation Review - 18-19 October 2011 D. GERARD BE/BI/ML

LINAC 4 Beam Instrumentation Review - 18-19 October 2011

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SLIT

D. GERARD BE/BI/ML

SLIT 0.1 mmStainless steel plate: thickness 1 mm with 0.2 mm at the slit position


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SEM-GRID

48 wires 40 µm Tungsten space 0.75 mm


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SEM-GRID


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SEM-GRID


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SEM-GRID

Polarized plate


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SEM-GRIDAngle setting


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Measurement plate (F.C.)


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Emittance Meter

D. GERARD BE/BI/ML


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Emittance Meter

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Emittance Meter

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Emittance Meter

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Emittance Meter

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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 degrees w.r.t. beam

trajectory

D. GERARD BE/BI/ML


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New Slit -Thermo-Mechanical Calculations (EN-MME)

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ANSYS Model Temperature Evolution during multi-shots

Without Cooling

With Cooling

Design Completed Fabrication Launched


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Specification3 MeV 12 Mev

H- range in Carbon [mm] 0.1 1

Min/Max Slit thickness [mm] 2/5

Min single blade width [mm] 67

Min single blade height [mm] 67

Min slit fullstroke [mm] 134

Blade distance (slit gap) all along the slit thickness

[µm] 100, adjustable to 200

D. GERARD BE/BI/ML


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NEW SLIT

D. GERARD BE/BI/ML


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Graphite plateBEAMdirection15°

D. GERARD BE/BI/ML

NEW SLIT

Slit: 0.1 mm or 0.2 mm


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wedge to adjust by machining after metrology measurement

D. GERARD BE/BI/ML

NEW SLIT


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

Five set of plates are ordered (3 spares)

D. GERARD BE/BI/ML

NEW SLIT


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

D. GERARD BE/BI/ML

NEW SLIT


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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

D. GERARD BE/BI/ML

NEW SLIT


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Fixation of the graphite plate on the support

D. GERARD BE/BI/ML

NEW SLIT

Thickness at the slit position : 1 mm



NEW SLIT


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NEW SLIT

Horizontal et vertical slit

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NEW SLITHorizontal et vertical slit movement with potentiometer

Window for laser profile measurement

Sliding support

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Stepping motor: 200 step / turn

Manipulator1.27 mm/turn => resolution 6.35 µm / motor step


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NEW SLITSlope setting with the back micrometric screw

Tilt setting with the 2 front screw

D. GERARD BE/BI/ML

0.25 mm/ turn

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


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TILT setting

D. GERARD BE/BI/ML

Is done with a optical benchThe 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.

Horizontal ref of the optical system

Several iteration by acting on the 2 micrometric srewuntil getting the slit horizontal


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Slope setting

D. GERARD BE/BI/ML

LASER BEAM

Laser beam sensor

Vertical movement of the laser

Mechanism under vacuum

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

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


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NEW SLIT

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NEW SLIT

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Budget new slit

• Design: 93 kCHF• Manufacturing: 150 kCHF (88 kCHF + 60

KCHF)Total: ~250 kCHF

D. GERARD BE/BI/ML



Some pictures



GEFRAN PKM175 Répétitivité : 0.01 mm


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Planning

• AP : delivery of the mechanical part earliest end of November.

• The supply parts are already at CERN except water flow, screw...

• Planning (working days):see next slide

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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 alignment2 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

D. GERARD BE/BI/ML



Planning

If the delivery from the AP (Main Workshop) is end-of November Þ25/01/2012 the new slit will be ready (mechanical) BUT in parallel the Winter Shut Down !!!


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• Thanks to:F. Roncarolo, B. CheymolB. Riffaud, E. Berthome, D. Steyaert, A.

DallochioG. Favre, S. Mathot M. Duraffourg, G. J. Focker....and all other people involved in this project

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Question?

• Thank for your attention• Question?

D. GERARD BE/BI/ML


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Cut view

D. GERARD BE/BI/ML

LINAC 4 Emittance Meter

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