1. EMC review for Belle II (Grounding & shielding plans) Sub-systems ( XXXXX)

2. Outline 1. Introduction 2. Grounding strategy –2.1. Implementations aspects 3. Noise emission issues –Test plans 4. Noise immunity issues –Test plans 5. Cabling 6.Conclusions

3. 1. Introduction Short description and schematic of each subdetector.

4. 2. Grounding strategy Outline of the grounding strategy – Information about current or previous grounding topology. Single point, multipoint or other –Describe the actual or proposed grounding topology Place a conceptual schematic. –Implementation Electro-mechanical schematic Type of grounding connection Bonding or straps? Capacitors connections ? ……. Nest slides shows as an example some of this schematics for PXD system

5. 2. Grounding strategy - Topology Single-point Only for low level and low frequency circuits (below 1 MHz) Multi-point For high level frequency circuits (above 1 MHz) It prevents excessive radiated emissions and maintains low impedance Better filter performance PXD is very small but the FE Amplifier bandwidth is around100 MHz Hybrid ground topology is the preferred option as FE amplifier bandwidth is very high – 100 MHz Hybrid Equivalent to Multi-point

6. 2. Grounding strategy - Topology PXDDetector

7. PXD connected to the cooling blocks via capacitors –High Frequency Ground Connection Cooling blocks connected to Beam pipe ? through direct bonding. Beam pipe connected to reference ground system. 6 de 18 2.1 Grounding strategy - Implementation Detector (FEE) Cooling block Beam pipe ? Reference ground Cooling pipe

8. 3. Noise emission issues Emission issues. –Analysis of the main noise sources Identification –Power supplies, slow control system or any other ??? Test plans Remark or comment the main noise sources for the subsystem –Type of noise Conducted or radiated ? –Frequency –Possible coupling path Test plans. –Noise emissions test plans ? –Show test results in case they have been already performed.

9. 4. Noise immunity issues Analysis of the main noise victims –Identification Describe the signal detection circuit (Detector – FEE ) Schematic Frequency range where detector circuit expect to be sensitive. Possible coupling path Describe any other sensitive circuit you expect noise problems Test plans. –Noise immunity test plans ? Show test results in case they have been already performed. Sensitive Nest slides shows as an example some schematics of detection circuit for PXD system

10. Vsource Vamplow S D G CG Clear Pixel DCD Zin (Z??) Signal Signal Return 4. Noise immunity issues – Signal circuit

11. Signal circuit: PXD

12. 5. Cabling Cabling and Shielding aspects –Type of cables ? –cabling layout ? –Cable connections ? –Grounding of cooling pipes ? –Any other relevant information

13. 6. Conclusions