5/11/23 -- Scope updates following pre-proposal submission -- Max, Silviu, Andriy, Victor

While we have not gotten any reponse to the pre-proposal yet, there have been two dominant pieces of hypothetical criticism:

1. CEBAF is not a good place for this type of experiment because of the experimental schedule forcing everything to happen during the SAD, and
2. The anticipated scientific output may not be enough, i.e., what do we learn from a measurement that we wouldn't be able to just simulate?

The project can be subdivided into the following components/stakeholders:

1. Build the target, plan for heating measurements (Silviu)
   • Thermometry includes temperature sensors on the target ladder as well as a pyrometer on a motion stage to measure the temperature distribution in at least one axis.
   • The wiggling mechanism will be included.
   • Addressing criticism 2: There is a discrepancy between the simulated power deposition and the analytical formula, raising doubts about the validity of the respective underlying models. By JLab standards, the target is unusually thick compared to the radiation length; at the same time, it is the highest-power beam target JLab has employed so far. This makes it
   • We can use Silviu's CAD pictures of the target ladder for the proposal. We will have to see if they provide a good sense of scale.
2. Put beam on the target (Max)
   • Addressing criticism 1:

Andriy will simulate an example phase space of the full secondary shower for some set of parameters that makes sense, just so we can write something about how to manage the thermal load downstream a little more precisely.