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Description
ShangYu
INTT chip saturation issue was studied
0.1% ＞68 hits
ADC distribution above/below 68 hits, where the hit saturation occurred
-> ADC distributions show a clear difference
-> Need to investigate in detail
No open time dependence in ADC distributions.
Todo : Check other runs
Nao
+ DAC0 Scan data was studied by 2025
+ It is found that the hit rate monotonically decreases with a higher DAC0 threshold
After removing hot channels for all the FELIX servers
+ good to use threshold = 25
-> This will be tested for the current data taking
-> If it works, we will use 25 as the default threshold value
+ question:
- How much the hot channels is increased by changing the threshold
Digital control : Tomoki
verbal updates
Hit carry-over by Ryotaro / Cheng-Wei
-> 2025 AuAu data analyzed.
- Fish-born structure was seen as a result of hit carry over.
-> pushing back the carry overhit is performed, It works nicely for N_collision=126
but some remain for Ncollision=100.
-> No opentime dependence was seen.
-> A strange rectangle structure was seen in Ncarryoverhit vs BCO spacing plot
Todo:
New decoder is needed to handle the carry-over hit
Beam test analysis : Cheng-Wei
+ spatial resolution was studied by comparing the residual distribution in data and simulation
- simulation containing only multiple scattering effect
- Sim residual is smeared by Gaussian which models the detector effect.
From the comparison of data and sim, the resolution was extracted as 18um
-> this is better than 78/sqrt(12). It is explained by charge sharing of the multiple strips
-> result should be put in the paper
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