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P. Paolucci and G. Polese (INFN di N apoli) 1 Introduction • An instability of the current generated by the HV boards (A3512N) has been observed during the first runs of the MTCC • The Imon of all the boards showed a drift of about 1-2 A in 4-5 days • The offset of every channel changed after any hardware reset/power cycle of the system but not after any software power cycle. • The instability was in the generated current or in the monitoring current ? • The effect was due to the chambers ? To the HV cable or connectors ? To the grounding ? Or the the boards (more realistic solution)

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Introduction. An instability of the current generated by the HV boards (A3512N) has been observed during the first runs of the MTCC The Imon of all the boards showed a drift of about 1-2 m A in 4-5 days - PowerPoint PPT Presentation

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Page 1: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

1

Introduction• An instability of the current generated by the HV

boards (A3512N) has been observed during the first runs of the MTCC

• The Imon of all the boards showed a drift of about 1-2 A in 4-5 days

• The offset of every channel changed after any hardware reset/power cycle of the system but not after any software power cycle.

• The instability was in the generated current or in the monitoring current ?

• The effect was due to the chambers ? To the HV cable or connectors ? To the grounding ? Or the the boards (more realistic solution)

Page 2: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

2

Imon History plot during MTCC

POWER CYCLE

What we have seen during the MTCC

Page 3: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

3

B1

B2

B3

B4

A1676

FAN

FAN

A1676

HARDWARE SETUP AT BLG 904

VENTILATED

RACK1

NOT VENTILATED

RACK0SY1527

resistors

resistors

4 boards corresponding to 10 HV channelsHave been tested with a resistive chargefor more then 10 days

We decided to make test (without chamber) in order to understand whereThe problem or the problems are.

Page 4: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

4

31 c 31 c

31 c

20 c

20 c20 c

WITH FAN UNIT

WITHOUT FAN UNIT

A3512N Stability Test

Imon History plot with resistive charge

Page 5: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

5

POWER CYCLE TEST

BOARD 1 CH0/1 BOARD 1 CH2

BOARD 2 CH0/1 BOARD 3 CH0/1

BOARD 3 CH2 BOARD 4 CH0/1

NO FAN-31C NO FAN-31C

NO FAN-31C FAN-20C

FAN-20CFAN-20C

POWER CYCLE

B2 CHO/1

Page 6: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

6

RESET SOFTWARE AND HARDWARE

SW

HW

As you can see from the history plot the Imon does not change at all when we madea software power cycle but change dramatically with an hardware reset

Page 7: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

7

Imon distrib (B1-CH0 without fan)

0

200

400

600

800

1000

1200

1400

9,3 9,5 9,7 9,9 10,1

sigma = 0.37 microAmps

Imon distrib (B3-CH0 with fan)

0

200

400

600

800

1000

1200

1400

1600

7,8 8 8,2 8,4 8,6 8,8

microA

#

sigma = 0.19 microA

Imon distribution for board with and without fan

As you can see from the distribution the of theventilated channel is less than0.2 microA as we required inthe technical specification

In total we have tested 10 channels for about 5 days andsimilar results has beenfound on the other channels

Page 8: Introduction

P. Paolucci and G. Polese (INFN di Napoli)

8

Conclusions1. We were able to reproduce the instability effect at BLG 904 using

resistive charge problem is not related to the detector/cable2. Measuring independently the current on the ground wire we

understood the instability was on the monitored current (Imon) and not on the generated current.

3. An increasing current has been seen in every tested channel after about 36 hours. The effect continues for days.

4. The increase let us suspect to a thermal drift of some components and so we begin to use the CAEN fan unit to ventilate the boards.

5. Using the fans the board temperature went down from 31oC to 20oC and after 4 days Imon was very stable.

6. The of the Imon distribution of the ventilated boards is 0.2 A and it was twice without fan.

7. Software power cycle do not affect the Imon (offset is constant)8. Hardware power cycle of any board present in the EASY crate

affect the offset of all the boards in the crate.9. CAEN got all the results and is now trying to reproduce them in

their lab and to find solution. We will meet CAEN engineering in two week.


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