STATUS of the final PACMAN bench integrationPACMAN meeting 11/06/2015

Hélène Mainaud Durand

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Meetings on the final PACMAN bench integration

- Launched beginning of May

- See Indico: https://indico.cern.ch/category/5070/

- Objectives:

- to agree on a general concept of bench,

- to prepare the data needed for the designer,

- to prepare the compatibility tests needed,

- To define a clear schedule and the associated responsibilities.

- To launch the design & procurement

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What we want to reach

Preparation of the bench:

- P1: To fix the BPM on the MB quadrupole in its linearity range, through a rigid link

- P2: To support the MB quadrupole + PBM on the nano-positioning system

- P3: To equip the common support with sensors interfaces and fiducials, as foreseen in CLIC

- P4: To pre-align the whole assembly within 5 DOF at a micrometric resolution, within a few mm, manually

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What we want to reach

Bench measurements:

• M1: To power & cool down the magnet (if needed: results known in month)

• M2: To determine the magnetic axis of the quadrupole and the electromagnetic axis of the BPM, using a CuBe wire dia. 0.1 mm

o By displacing the wire o By displacing the whole assembly (possible on a very small stroke: few µm)

• M3: To determine the relative position of the magnetic axis, w.r.t the electromagnetic of the BPM, via CMM measurements

• M4: To determine the position of the magnetic axis of quad and electromagnetic axis of the BPM w.r.t. external fiducials, via CMM measurements

• M5: To characterize the environment

• M6: To perform additional tests (using the nano-positioning system) as: o Determining the resolution of the BPM o Determining the resolution of the determination of the magnetic axis o Repeatability measurements of the determinations

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What we want to reach

Bench measurements:

• M7: FSI and µ-triangulation measurements (TBC)

• M8: characterization of the environment with a seismic sensor

• Compatibility tests between the systems will be organized ASAP.

• The whole system will be assembled and tested in the ISR8 before being displaced in the metrology lab.

• Measurements in the metrology lab as fast/effective as possible

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Requirements (metrology lab)

Leitz Infinity:

• Volume of measurements: 700 mm (height) x 1000 mm (width) x 1250 mm (length). In addition, the table is longer by 25 mm on each side.

• There is a possibility to screw on the CMM table a longer plate that would support the PACMAN test bench, but there could be some issues concerning vibrations.

• The CMM table has got threaded holes that could be used to clamp the wire stages.• Maximum load admissible: 1 t (but there are some possibilities to go up to 2 t)

CMM table

Measurement room

Outside the measurement

room

Measurement room:

• Limited T° dissipation

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Requirements (magnetic measurements)

Outside the measurement room

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Requirements (magnetic measurements)

Displacement tables:

• NI M605 (current one): 0.2 µm of bidirectionnal repeatability, travel 50 mm• Newport VP 25X: ± 0.7 µm, travel 25 mm

Determination of the magnetic axis by interpolation & scaling from different measurements

• The wire is put in place according to the offsets obtained from the interpolation, using the displacement tables.

• The wire is measured at different positions, and its final position is obtained by interpolation (as the magnetic axis).

Open points:

• Replacement of opto-coupler (small range of measurements)• Lock-in amplifier?• Improvement of the tensioning stepper motor

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Requirements (BPM measurements)

CMM table

Outside the measurement room

To be shared with Domenico (and David?)

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Requirements (BPM – MB quad interface)

BPM requirements:

• The flanges are not brazed on both sides and can be adapted.• The BPM can be mounted on the two sides, with a preference to attach the dipole mode cavity

directly to the quadrupole, as the measurements will be performed with that cavity.• On the dipole mode cavity, 90° adaptors on the 4 guides could ease the access• Definition of the linear zone: ± 300 µm around the electrical zero (valid only with that wire). Taking

into account the manufacturing tolerances, the electrical zero and the mechanical axis should not be far away: within ± 5 µm. (to be cross-checked via measurements)

Nano-positioning requirements:

• The BPM shall not vibrate with modes below 100 Hz and should be attached to the quadrupole via a support bringing high stiffness. A flexural stiffness of 50 N/µm has been computed by David (with a safety factor of 10).

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Requirements (BPM – MB quad interface)

Design of the interface:

• Solution proposed by Iordan integrated a flange + pipe around the wire that is no more needed, and was hyperstatic

• The vacuum pipe foreseen for CLIC will have a butterfly shape. It could be replaced for PACMAN by a “standard” pipe.

• Given the distance between the BPM and quadrupole, we could have quite an important angle between both components axes.

• Different designs could be proposed:o A BPM + a long vacuum pipe that would be inserted inside the quadrupole, and then holds

using an external fixationo Use of pins to fix the BPM on the magnet, with a kind of shim to put in place the BPM, that

would be removed afterwardso Use of a kinematic mount to attach the BPM

• The different options will be pre-studied by Kurt with the help of Raphaël Leuxe and presented in the next integration meeting.

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Requirements pre-alignment interface

Requirements:

• Manual adjustment according to 5 DOF of the MBquad assembly, with a resolution of a few µm

Existing design:

Open points:

• Upper plate to be adapted to the nano-positioning system• Is the resolution sufficent (will not cover the stroke of the nano-positioning system)?• Details drawings to be finished

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Compatibility with CMM requirements

• No problem of weigh• No problem concerning the width• Height to be checked• Length is a concern optimization concerning the marble supporting the stretching devices

displacement tables

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Next steps

Gather the last requirements:

• Micro-triangulation & FSI system• Seismic sensor• Pre-alignment sensor support & fiducials

Propose a concept of the interface MB quadrupole – BPM

Define & organize the compatibility tests needed,

Define a clear schedule and the associated responsibilities

Launch the design & procurement