= Design and Integration meeting: 27 October 2025 11:00 BST =

'''Zoom:''' https://ukri.zoom.us/j/99571436156

== Agenda ==
* CDR.
* Simulations.
* AOB.

== Notes ==
Present: WS MMC CW TJK KL JP JM \\
Absent:  RR HO MP \\

* CDR
	* A few minor issues required discussion on the CDR:
		* Eqn 2.17 has a factor ''t'' in it which cannot be correct. Author unknown, JP to read references & correct.
		* 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. 
		* 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.
		* WS to send JM the updated LhARA schematic diagram with updated caption. 
		* WS to add dimensions to the diagram.
		* KL highlighted preferred use of mm & m, and to avoid cm. Text can be changed but modifying figures might be troublesome. Is context specific.
* Simulations
	* WS: no update due to time toward Imperial Lates last week.
	* TJK: plots shown on field leakage (see attached). 
		* End leakage small & away from the cavity, not thought to be significant. 
		* Field in the aperture/GFR does is larger. JP pointed out that the cores are at the edge of the aperture, not in it.
		* 250mm long cavity included but planned device is 200mm long 
	* JP: Presented on chromatic effects in the Stage 1 arc. Slides will be attached.
		* Dispersion calculated to be small. Higher order dispersion is finite & thought may be contributing to the effects MP sees. 
		* 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). 
* AOB
	* WS raised that the IPAC abstracts have opened. We agreed to submit a general LhARA update abstract. 
	* JP recalculated RF cavity frequencies for protons & ions. 
		* LhARA range should be 1.46 MHz to 6.51 MHz. Lower number comes from carbon ions at 4 MeV/u, upper from protons.
		* 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.