Crystal temperatures on Oct.1-Oct.2

• Dash line denotes the start time of each run

First 6 runs taken on Oct.1-Oct.2 (run 1549-1554)

Electron energy

Energy resolution in NPS

Coefficients (zoom in)

Coefficients in 2D view (zoom in)

Last 6 runs taken on Oct.1-Oct.2 (run 1555-1560)

Electron energy

Energy resolution in NPS

Coefficients (zoom in)

Coefficients in 2D view (zoom in)

Ratio of these coefficients (last 6 runs / first 6 runs)

• The light yield of crystals decrease when the temperature increase
• Higher temperature result in higher coefficients

Energy with mis-calibration due to the unsteady temperature

• Apply the coefficients from run 1549-1554 to the data of run 1555-1560
• 32% difference of the resolution (0.025→0.033)
• Under estimation of deposited energy: 7.479→7.205 GeV ($E_{dep}=C\times Amp.$)

Electron energy

Energy resolution in NPS

Previous coefficients (with run 1437-1442) are quite uniform, why?