Changes between Version 1 and Version 2 of Research/LhARA/DesignAndIntegration/Meetings/2025/2025-10-27


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Timestamp:
Oct 27, 2025, 4:04:44 PM (7 days ago)
Author:
wshields
Comment:

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  • Research/LhARA/DesignAndIntegration/Meetings/2025/2025-10-27

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    99
    1010== Notes ==
    11 Present: \\
    12 Absent:  \\
     11Present: WS MMC CW TJK KL JP JM \\
     12Absent:  RR HO MP \\
    1313
    1414* CDR
    15         *
     15        * A few minor issues required discussion on the CDR:
     16                * Eqn 2.17 has a factor ''t'' in it which cannot be correct. Author unknown, JP to read references & correct.
     17                * Emittance not consistent in table 2.12, WS pointed out that MAD-X assumes constant emittance whereas BDSIM & GPT do not. JM to remove MAD-X emittance value from that table.
     18                * Font is small on a number of figures. WS can easily replot with larger fonts. JM & KL to send list of figures that need modifying.
     19                * WS to send JM the updated LhARA schematic diagram with updated caption.
     20                * WS to add dimensions to the diagram.
     21                * KL highlighted preferred use of mm & m, and to avoid cm. Text can be changed but modifying figures might be troublesome. Is context specific.
    1622* Simulations
    17         *
     23        * WS: no update due to time toward Imperial Lates last week.
     24        * TJK: plots shown on field leakage (see attached).
     25                * End leakage small & away from the cavity, not thought to be significant.
     26                * Field in the aperture/GFR does is larger. JP pointed out that the cores are at the edge of the aperture, not in it.
     27                * 250mm long cavity included but planned device is 200mm long
     28        * JP: Presented on chromatic effects in the Stage 1 arc. Slides will be attached.
     29                * Dispersion calculated to be small. Higher order dispersion is finite & thought may be contributing to the effects MP sees.
     30                * The impact on the beam size is small but this is noted to be recorded at the arc exit, not the end station (2m downstream).
    1831* AOB
    19         *
     32        * WS raised that the IPAC abstracts have opened. We agreed to submit a general LhARA update abstract.
     33        * JP recalculated RF cavity frequencies for protons & ions.
     34                * LhARA range should be 1.46 MHz to 6.51 MHz. Lower number comes from carbon ions at 4 MeV/u, upper from protons.
     35                * Stage 2 carbon ion energies will be limited to no lower than ~ 25 MeV/u. Radiobiological needs are unclear. A degrader may be needed for intermediate energies but fragmentation will be an issue.
    2036
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