Recent results Marc & Qian

Outline 3D uniformity scan End cap TOF counter test result Report of moving laser box

3D Uniformity Scan

We used USTC DAQ system to do the 13x13 3D uniformity scan = 171 total files, which covers a 3mm x 3mm square area. The reason for 171 is because we repeated the origin measurement three times (1st time is at initial origin, 2nd time is on the grid, 3rd time is final file.) / X Y (0.180,0.215) Origin (0.240,0.275) (0.300,0.335)

The percent variation over 2.5mm x 2.5mm ～ 13%.

Summary / Conclusion: 1. We did this test before we move the “Moon” Box. 2. We know from our 2 D linear X,Y scans via O-Scope, that we are able to achieve uniformity on the order of ~4%. 3. We now conclude that the USTC/main DAQ interface requires more fine tuning. 4. We know from the ref-PMT data (reading from faster O-Scope) that the laser is quite stable. 5. (To be continued…)

End cap TOF counter test

Hole A Hole B We set the HV of EC and Barrel TOF separately to achieve both gain = 1E+5. The Barrel TOF signal’s PH is mV. EC TOFSignal PH (mV)Wiggle fiber Hole A ~161 mV Hole B ~260 mV Hole A Hole B For Hole B, if we use solenoid 3 with 63% transparency, the PH is 164 mV

Summary / Conclusion: 1.According the EC TOF Fiber installation method, the both holes are easy to achieve. 2.Using Hole A, we don’t need to use solenoid 3 or filter, the EC TOF and Barrel TOF signals’ PH are almost the same, and Hole A is more stable than Hole B when we wiggled the fiber. Marc & Qian 老善 刘倩

Moving Laser Box

Before we moved the Moon Box, we tested the Ref-PMT PH: OriginPMT (mV)PH (mV) CH1(east)(0.305,0.330) CH2(west)(0.240,0.275)

We’ve moved the “Moon Box” into the rack. Then we tested the PH: CH1 (460): mV CH2 (486): mV

Summary / Conclusion: 1.After we moved the moon box, we need to do the alignment again. 2.The PH decreased about 8%. Marc & Qian 老善 刘倩