Attendees: Ashot, Chao G, Chao P, Dipangkar, Eugene, Haiyan, Li, Nilanga, Maxime, Weizhi, Xinzhan.

The vacuum window thickness was confirmed.

Report was sent to Volker, they prefer to get an updated plot before the July 2nd meeting.


Xinzhan:
1. Showed all different components of the experiment that were added to the simulation. 
<TASK> include any beamline crosses between the collimator and target.

<TASK> confirm if there are one or two orifices added by the target group to the target chamber and include them.

<TASK> Update the thickness of copper on the readout board of the GEM chambers.

<TASK> Add the honeycomb window on the front of HyCal, may already be there.
(check the thickness and exact material density, currently 2 mm thick and 1.4 g/cm^3, density needs to be reduced), also a 200 micron polyethelene tube in the center.

<TASK> The small tilt to the HyCal collimator/absorber needs to be included. Check material of the collimator too. It needs to be Al.

2. Compared simulated reconstructed cluster energy with data for 2.2 and 1.1 GeV, the sigmas are similar for each slice.

For next week, update simulation and study GEM efficiency. 

Maxime:
1. Some discrepancy between Maxime and Weizhi's cross sections for 0.75 and 0.9 degree (~5%)
2. Also has a bump around 1 degree in the ep/ee ratio
3. The Raw and background ep yields also shows a difference. The exact event samples may be different. The largest difference is in the empty target data.

<TASK> Check exact event samples that were used/thrown away. 

Weizhi:

Checked the effect of spacers on the reconstruction using 2 electron Moller data.
Checked vertex reconstruction for events not effected by spacers or overflows. No significant improvement in resolution. 

<TASK> play with curvature of vacuum window.