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AWAKE Run 2bc Spectrometer
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AWAKE Run 2bc Spectrometer
Electron Spectrometer Meeting – 30/07/2025
Present: Edda, John, Collette, David, Fern, Joe, Marlene, Patric
Dipole Chamber Angle:
Nicolas is currently using a 14-degree chamber angle. The UCL team will review this and provide an update asap if changes are necessary. Marlene urges everyone to check the preliminary drawings sent by Nicolas very carefully.
→ To do: Marlene, Joe, and Debdeep to follow up with Nicolas regarding the feasibility of angling the OSR port at approximately 1 degree for optimal transmission.
→ To do: Joe, Debdeep, and David to investigate the maximum feasible window size that still allows reliable measurement of 10 GeV beams on the screen.
Emittance Data analysis:
* David reported that the data taken during the 2025 run is of insufficient quality to draw conclusions beyond those based on the 2024 lower-energy data. This is also due to the limited amount of time allocated to this measurement.
→ Comment: Marlene expressed surprise, as the agreed approach had been to take an initial dataset, perform a quick analysis, and then decide whether additional data collection was necessary. After the initial data was taken, the status of the preliminary analysis was followed up multiple times in the control room, where the data had consistently been described as "good and sufficient."
Patric (per email afterwards) and Edda stress that nevertheless the data should be analysed and presented. → To do: David.
Specification Document:
Edda shared the document template. David has not yet transferred the content.
→ To do: Marlene asked David to include a Physics Section in the document, responding to the statements requested from Patric’s (shared via email on 15/07/2025), and clearly stating what conclusions can or cannot yet be drawn.
For reference, the requested statements were:
1) the parameters expected from the experiment (4 to 10GeV, 5% relative energy spread, 2mm-mrad normalized emittance) can be measured with the magnetic spectrometer we designed
2) the normalized emittance and relative energy spread that can be measured in the 4-10GeV energy range with the spectrometer we designed are ...
Edda emphasized that a statement on the spectrometer’s maximum energy reach—including considerations for realistic beams—should be explicitly included in the minutes of the BI review, currently being prepared by Collette.
→ To do: David.
Electron Acceleration Data:
Fern reported no significant updates beyond the preliminary analysis already carried out in the control room. She is currently working on refining the error bars.
There are minutes attached to this event.
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