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SVD2 System test status. Problem 1 Around 4/15, we met current shortage problem. On VA parameter tuning To obtain shorter shaping time(Tp), we changed “mbias”. Mbias defined DAC range inside VA1TA Mbias = 0.9mA/hybrid, Tp= 1.2us ⇒2.0mA(Typ. on VA manual) , Tp= 700ns

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svd2 system test status
SVD2 System test status
  • Problem 1
    • Around 4/15, we met current shortage problem.
    • On VA parameter tuning
      • To obtain shorter shaping time(Tp), we changed “mbias”.
      • Mbias defined DAC range inside VA1TA
      • Mbias = 0.9mA/hybrid, Tp=1.2us

⇒2.0mA(Typ. on VA manual) , Tp=700ns

    • Finally, we found a current shortage occurred on MAMBO and PS.
    • Modified MAMBO and PS Cabling⇒Solved on 53 and 5/13
power supply system
Power supply system

Power Supply×10

DOCK

+/-7.5~9.5V

+5V

Analog+

(5A)

VA1TA

3A

REBOx3

+3V

+1.5V

3A

1A

-5V

Analog-

(10A)

2A

-3V

-2.0V

6A

2A

+5V

Digital+

(5A)

3A

Solved!

-5V

Digital-

(5A)

3A

MAMBO

power supply v
Power supply +V

1.6times lager than

expected value

Power Supply

DOCK

+5V

Analog+

(5A)

VA1TA

3A

REBOx3

+3V

+1.5V

3A

1A

-5V

Analog-

(10A)

2A

-3V

-2.0V

6A

2A

Modification has been succeeded!!

+5V

Digital+

(5A)

3A

-5V

Digital-

(5A)

3A

MAMBO

system test status cont d
System test status(cont’d)
  • Problem 2
    • With higher “mbias”(=2mA/hybrid), some VA output showed oscillation. (5/17)
      • With lower mbias(0.9mA/hybrid), no oscillation.
    • Phenomena
      • Only on L4,L3-BW (3DSSDs half ladder)
      • No oscillation on L1,L2,L3-FW
      • Osc. occur on P and N simultaneously.
    • Investigation
      • Grounding Endring MAMBO
      • Capacitor btw hybrids : check with L3 ladder.
      • Offset voltage ⇒no effects
with mbias 2ma hybrid
With mbias=2mA/hybrid

outA

difference

outB

f=1.95MHz

slide6

offset

N=+40V

P=-40V

DSSD

DOCK

Hybrid

solution
Solution(?)
  • Setting for Prebias (3 bits)
    • Bit 1 must be 0!!
      • “110” must be the largest Prebias value.
    • Still unstable at single channel mode
      • Some hybrids oscillate sometimes.
      • Other parameters should be tuned
      • Trigger performance is not
    • Range of parameter tuning is restricted for VA and TA
slide10

outA

Tp=650ns

Long tail

outB

slide11
Typ mbias(2mA)
  • Prebias=“100”
  • Others are “fast” parameter
  • 1 hybrid on L4 shows huge noise.
schedule for next two weeks
Schedule (for next two weeks)
  • Full system
    • L1.5 integration (Ziegler) Continue
    • VA tuning (Matsumoto) 5/22.
    • TA threshold tuning ( Ishino, Kaneko)5/23~6/1
    • Cosmic ray run should be resumed ASAP for trigger integration and final system check.
      • 5/25- Test run
      • 6/2- Cosmic run
        • 8 hour/day
        • TA tuning, Trigger integration, slow control test in parallel
  • 1/10 system
    • TA study, trigger integration(Hazumi, Nakadaira)
    • Laser scanning for test sensor (Tsuboyama)
3v analog
-3V analog

~5A

0.5W

Output

-3.3V

6A needed

  • 0.5W resistor is too small
    • Limited ~ 4A
  • Replaced to 1W ⇒ OK up to 6A
    • Krakow agreed to the modification
      • Recommend to use larger power consumption resistor

Regulator(1.4A)

Input

-7.5~-9.5V