MONALISA: Attachment of Vacuum Vessels for ATF2

David Urner

Basic Idea• Use Compact Straightness Monitor to relate top of QD0

magnet with top of Shintake Monitor• Use Distance Meters to monitor pole tip of magnet and

IP-BPM.

Shintake Monitor Table

QD0

Monalisa Optics Mount

MONALISA Vacuum Tube

BPMIP-BPM

Monalisa Optics Mount

ShintakeTable

QD0

MONLISA mounting plate

MONLISA mounting plate

MONALISA Vacuum Tube

Double Bellow System

Scaffolding for back endof double bellow system

Bracket for front end of double bellowsystem. Attachedto Shintake scaffolding

First approximation:

Assume double bellowsystem decouples perfectly.

ShintakeTable

QD0

MONLISA mounting plate

MONLISA mounting plate

MONALISA Vacuum Tube

Double Bellow System

Scaffolding for back endof double bellow system

Bracket for front end of double bellowsystem. Attachedto Shintake scaffolding

First approximation:

Assume double bellowsystem decouples perfectly.

Attaching Vacuum System Force-Free

Back end of doublebellow system:Attach to floor moun-ted scaffolding Contains the optics

of interferometer.

Front end of doublebellow systemAttach vacuum tubeFor interferometer

6 Strain gauges• Needs bellow to allow motion of BPM– Vacuum causes a force

order of 100N! • Develop small force

vacuum mount using double bellow system.

• Allows small motion (~1 mm) of BPM- system

• Test stand to measure remaining (perpendicular) force on BPM frame.

Proceed to a FEA of Full System

• Find way to model vacuum bellow in FEA

• Use prototype in lab to validate model

Here attach vacuum tube for interferometerAttached to BPM.

Holds retro reflector.

Firmconnection

Strain Gauge

-1mm-3mm 1mm 3mm

1N

2N

-1N

0N

-2N

-3N

-3N

Force exerted on carbon frame (BPM)±1mm: < 0.5N/mm±3mm: < 0.8N/mm

Force exerted by perpendicular motion

More Input needed• To prove that no unwanted frequencies will be introduced: We will

do a integrated FEA of Shintake-Table+MONALISA-Vacuum-System– Requires Parameters of Shintake table.– Boundary conditions.– Helpful: get Model Report from Shintake-table FEA.

• Any additional information about size and structure of new Shintake Monitor Mounting system.

• Fundamental Question:– Is space free on top of Shintake Monitor?– Is space free on top of QD0?– How much weight can we add to the QD0 magnet (movers)?– Is it ok to attach our bracket to Shintake Monitor scaffolding?

• Can we orient QD0 in such a way that the terminal side is downstream and can we mount the BPM on this side of the magnet?