Choose timezone
Your profile timezone:
11th Injection Region Design Meeting
→
Europe/Zurich
CERN
CERN
11th Injection Region Design Meeting
Meeting Notes
Present: Marlene, Patric, Justin, Daniel, Jim
MPP GWA Contract
-
Contract is moving forward.
2. Beam Waist Measurement
2.1 Optical Method
-
Manufacturer has no experience operating above 40 °C → lens will require cooling.
-
Preliminary simulations indicate that adding the measurement system would impact temperature uniformity by approximately 1.5–2.5 °C on axis over ~10 cm (potential for improvement) on axis.
-
Question: Can additional insulation be added to reduce thermal conductivity?
-
Next step: Investigate relaxing the cooling requirement to approximately 35 °C.
Actions:
-
Marlene & Patric: Study the impact of such a temperature dip on injection.
-
Evaluate purchasing a lens and testing it under elevated temperature conditions.
2.2 Wire Scanner Method
-
GWA identified a company capable of vapor-depositing a µm-width gold wire.
-
Open question: Could tungsten also be used?
-
-
Glass coating could be an option, but thermal expansion may be problematic.
-
PSI has an existing wire tensioning system.
-
Question: Would it function reliably in a higher-temperature environment?
-
Action:
-
Patric to share a picture of the CLEAR cavity BPM.
Topics to Discuss with PSI
-
Vibrations
-
Feasibility and benefit of adding a third wire at 45°
-
Possibility of using gold wire
-
Whether only the fork of the wire system can be purchased
-
How the tensioning system works and its compatibility with higher temperatures
-
Required BPM location
3. Vacuum & Materials
Actions:
-
Marlene to ask Maria Carmen about the upstream bypass volume.
-
Clarification: Flanges and connections to CERN VSC equipment will remain at room temperature.
-
-
Marlene to ask Nicolas which material will be used for the spectrometer vacuum chamber and send the technical drawing to Daniel.
-
Daniel to share magnetic permeability (µ) values of candidate materials for the large chamber.
-
Afterward, Marlene to organize a meeting with Vittorio to follow up on mu-metal compatibility.
4. Beam Dynamics
-
Aperture changes near the injection area require wakefield simulations of the full beamline (including injection region to the waist), or at minimum expert clearance.
Action:
-
Marlene to ask Edda who will perform these simulations and request that this task be added.
5. Infrastructure
-
GWA to provide rough estimates of heat dissipation from racks in TCV4.
-
No temperature stability requirements currently specified for the racks.
Action:
-
Patric to organize a meeting with Nicolas to discuss supports.
6. Next Meeting
Action:
-
Justin to propose a date for the next in-person review.
There are minutes attached to this event.
Show them.
