Recent News on the TRD Integration

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Recent News on the TRD Integration

• K. Oyama C. Lippmann
• 2005 Dec. 19
• TRD Status Meeting at GSI

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New ROBs on the Chamber

• 1 x Type2B ROB, 2 x Type1A ROBs, and 1 x Type1B
  ROB.
• New-final HV supply, distribution box, filter
  box.
• Finalized mounting and grounding scheme, with
  proper connections.

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Results from new ROBs

• Recent ROBs production yield is good, however
• 1 SCSN not accessible in Type2B (SCSN-IN at one
  MCM broken).
• 1 MCM not working in Type2B.
• Unstable SCSN in one link of Type1A Type1B
  (investigated).
• Concerning noise
• Further optimization of HV cable length from HV
  filter box to the chamber.
• Noise from DCS was found and almost removed.
• Charge pump noise is still there, being
  investigated.
• The best value we achieved is 1.18 LSB 1250 e
  with battery.
• Strong 8.9 MHz sin-wave oscillation if charge
  pump is not working.

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Charge Pump Noise
Tek. diff. probe
p-to-p 8 mV on PASA
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Charge pump noise

• Difference of noise in TRAP data 50 e to 100 e.
• Contribution of 1000 e noise in addition to
  thermal noise.

w. 470 uF at out 68 uF at input
w. 470 uF at out
p-to-p 4 mV on PASA
p-to-p 3 mV on PASA

• Changes in ROB design was already done for next
  production by Ivan, with large capacitors and
  closer C-R-C-C filter to the charge pump.
• Also we are planning to have separated shielded
  charge pump module.

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Noise from DCS

• It is well shielded by gt 25 um aluminum sheet
  between ROB and DCS.
• Noise level is changed from 1.8 to 1.2 LSB which
  is close to the case if DCS is outside chamber
  (1.18 LSB).
• Larger area than DCS must be covered.

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Conclusion

• We have now (acceptable) noise level 1250 e
  with battery.
• DCS noise is understood. We introduce 25 50 um
  aluminum shield.
• Charge pump noise is still problem. Ivan already
  is changing design. We are thinking also to have
  independent module.
• We must investigate to have the same noise level
  for all types of ROB including Type3A,B OASE.
• We start L0C1 equipments this week for
  super-module 1.
• Most of the super-module components are ready to
  accept final ROBs including Type3A, Type3B,
  Type4A, and Type 4B !!

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