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

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 Hybrid Equivalent to Multi-point Multi-point For high level frequency circuits (above 1 MHz) Single-point Only for low level and low frequency circuits (below 1 MHz) • Hybrid ground topology is the preferred option as • FE amplifier bandwidth is very high – 100 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

6. 2. Grounding strategy - Topology PXD Detector

7. 2.1 Grounding strategy - Implementation • 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. Cooling block Cooling pipe Detector (FEE) Beam pipe ? Referenceground

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

11. 4. Noise immunity issues – Signal circuit 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