1. STATUS of the final PACMAN bench integration PACMAN meeting 11/06/2015 Hélène Mainaud Durand

2. 2 Meetings on the final PACMAN bench integration -Launched beginning of May -See Indico: https://indico.cern.ch/category/5070/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

3. 3 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

4. 4 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

5. 5 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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7. 7 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

8. 8 Requirements (magnetic measurements) Outside the measurement room

9. 9 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

10. 10 Requirements (BPM measurements) CMM table Outside the measurement room To be shared with Domenico (and David?)

11. 11 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).

12. 12 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 fixation o 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 afterwards o 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.

13. 13 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

14. 14 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

15. 15 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