SSD SEU Candidates Investigation

26
SSD SEU Candidates Investigation

description

SSD SEU Candidates Investigation. All Candidates 2010 - 2013. Measured and Integrated Dose. RAMSES Sensors , but dose given in Sv and not in Rad - PowerPoint PPT Presentation

Transcript of SSD SEU Candidates Investigation

Page 1: SSD SEU  Candidates Investigation

SSD SEU Candidates Investigation

Page 2: SSD SEU  Candidates Investigation

All Candidates 2010 - 20132013

DATA LADDER DDL REASON SOLUTION

08/02/2013 A618 513 Ladder become noisy (Pedestal didn't work) FEROM Firmware reloaded

07/02/2013 523 High Data Size (Pedestal didn't work) FEROM Firmware reloaded

30/01/2013 519 High Data Size (Pedestal didn't work) FEROM Firmware reloaded

29/01/2013 516 CDH error (miniEventIdMismatch) FEROM Firmware reloaded

2012

DATA LADDER DDL REASON

19/11/2012 513 CDH error (miniEventIdMismatch) FEROM Firmware reloaded

31/10/2012 A520 514 Ladder become noisy (Pedestal didn't work) FEROM Firmware reloaded

31/07/2012 513 CDH error (miniEventIdMismatch) FEROM Firmware reloaded

2011

DATA LADDER DDL REASON

07/09/2011 514 CDH error (miniEventIdMismatch?) FEROM Firmware reloaded

03/08/2011 514DDL busy, but no more infos from the logbook. Maybe solved with FEROM

power cycle FEROM power cycle?

2010

DATA LADDER DDL REASON

12/07/2010 521 DDL busy after moving from Supersafe to REAdy FEROM power cycle

Page 3: SSD SEU  Candidates Investigation

Measured and Integrated Dose

• RAMSES Sensors, but dose given in Sv and not in Rad

• No sensors exatly near our racks (see next slide map). The two nearest (on A side) are one on the miniframe (PMIL2513) and one at the edge of the ALICE Cavern (PMIL2511). Our racks are in between. Not sure if there are sensors on I side

• Two values of measured and integrated dose, one per sensor

Page 4: SSD SEU  Candidates Investigation
Page 5: SSD SEU  Candidates Investigation

Measured Dose 2010-2013 (Sv/h) – PMIL2513

2/1/

10 0

.00

11/2

/10

0.00

23/3

/10

0.00

2/5/

10 0

.00

11/6

/10

0.00

21/7

/10

0.00

30/8

/10

0.00

9/10

/10

0.00

18/1

1/10

0.0

0

28/1

2/10

0.0

0

6/2/

11 0

.00

18/3

/11

0.00

27/4

/11

0.00

6/6/

11 0

.00

16/7

/11

0.00

25/8

/11

0.00

4/10

/11

0.00

13/1

1/11

0.0

0

23/1

2/11

0.0

0

1/2/

12 0

.00

12/3

/12

0.00

21/4

/12

0.00

31/5

/12

0.00

10/7

/12

0.00

19/8

/12

0.00

28/9

/12

0.00

7/11

/12

0.00

17/1

2/12

0.0

0

26/1

/13

0.00

7/3/

13 0

.00

0.0000000000

0.0050000000

0.0100000000

0.0150000000

0.0200000000

0.0250000000

0.0300000000

Measured Dose (Sv/h)

Measured Dose (Sv/h)

Page 6: SSD SEU  Candidates Investigation

2/1/

10 0

.00

11/2

/10

0.00

23/3

/10

0.00

2/5/

10 0

.00

11/6

/10

0.00

21/7

/10

0.00

30/8

/10

0.00

9/10

/10

0.00

18/1

1/10

0.0

0

28/1

2/10

0.0

0

6/2/

11 0

.00

18/3

/11

0.00

27/4

/11

0.00

6/6/

11 0

.00

16/7

/11

0.00

25/8

/11

0.00

4/10

/11

0.00

13/1

1/11

0.0

0

23/1

2/11

0.0

0

1/2/

12 0

.00

12/3

/12

0.00

21/4

/12

0.00

31/5

/12

0.00

10/7

/12

0.00

19/8

/12

0.00

28/9

/12

0.00

7/11

/12

0.00

17/1

2/12

0.0

0

26/1

/13

0.00

7/3/

13 0

.00

0.0000000000

0.0005000000

0.0010000000

0.0015000000

0.0020000000

0.0025000000

0.0030000000

Measured Dose (Sv/h)

Measured Dose (Sv/h)

Measured Dose 2010-2013 (Sv/h) – PMIL2511

Page 7: SSD SEU  Candidates Investigation

Measured Dose 2010-2013 (Sv/h) – PMIL2513(Zoom)

2/1/

10 0

.00

11/2

/10

0.00

23/3

/10

0.00

2/5/

10 0

.00

11/6

/10

0.00

21/7

/10

0.00

30/8

/10

0.00

9/10

/10

0.00

18/1

1/10

0.0

0

28/1

2/10

0.0

0

6/2/

11 0

.00

18/3

/11

0.00

27/4

/11

0.00

6/6/

11 0

.00

16/7

/11

0.00

25/8

/11

0.00

4/10

/11

0.00

13/1

1/11

0.0

0

23/1

2/11

0.0

0

1/2/

12 0

.00

12/3

/12

0.00

21/4

/12

0.00

31/5

/12

0.00

10/7

/12

0.00

19/8

/12

0.00

28/9

/12

0.00

7/11

/12

0.00

17/1

2/12

0.0

0

26/1

/13

0.00

7/3/

13 0

.00

0.0000000000

0.0010000000

0.0020000000

0.0030000000

0.0040000000

0.0050000000

Measured Dose (Sv/h) - Zoom

Measured Dose (Sv/h)

Page 8: SSD SEU  Candidates Investigation

Measured Dose 2010-2013 (Sv/h) – PMIL2511(Zoom)

2/1/

10 0

.00

11/2

/10

0.00

23/3

/10

0.00

2/5/

10 0

.00

11/6

/10

0.00

21/7

/10

0.00

30/8

/10

0.00

9/10

/10

0.00

18/1

1/10

0.0

0

28/1

2/10

0.0

0

6/2/

11 0

.00

18/3

/11

0.00

27/4

/11

0.00

6/6/

11 0

.00

16/7

/11

0.00

25/8

/11

0.00

4/10

/11

0.00

13/1

1/11

0.0

0

23/1

2/11

0.0

0

1/2/

12 0

.00

12/3

/12

0.00

21/4

/12

0.00

31/5

/12

0.00

10/7

/12

0.00

19/8

/12

0.00

28/9

/12

0.00

7/11

/12

0.00

17/1

2/12

0.0

0

26/1

/13

0.00

7/3/

13 0

.00

0.0000000000

0.0000020000

0.0000040000

0.0000060000

0.0000080000

0.0000100000

Measured Dose (Sv) - Zoom

Measured Dose (Sv/h)

Page 9: SSD SEU  Candidates Investigation

Integrated Dose 2010-2013 (Sv) – PMIL25132/

1/10

0.0

0

11/2

/10

0.00

23/3

/10

0.00

2/5/

10 0

.00

11/6

/10

0.00

21/7

/10

0.00

30/8

/10

0.00

9/10

/10

0.00

18/1

1/10

0.0

0

28/1

2/10

0.0

0

6/2/

11 0

.00

18/3

/11

0.00

27/4

/11

0.00

6/6/

11 0

.00

16/7

/11

0.00

25/8

/11

0.00

4/10

/11

0.00

13/1

1/11

0.0

0

23/1

2/11

0.0

0

1/2/

12 0

.00

12/3

/12

0.00

21/4

/12

0.00

31/5

/12

0.00

10/7

/12

0.00

19/8

/12

0.00

28/9

/12

0.00

7/11

/12

0.00

17/1

2/12

0.0

0

26/1

/13

0.00

7/3/

13 0

.00

0.0000000000

0.5000000000

1.0000000000

1.5000000000

2.0000000000

2.5000000000

3.0000000000

3.5000000000

Integrated Dose (Sv)

Integrated Dose (Sv)

Page 10: SSD SEU  Candidates Investigation

2/1/

10 0

.00

11/2

/10

0.00

23/3

/10

0.00

2/5/

10 0

.00

11/6

/10

0.00

21/7

/10

0.00

30/8

/10

0.00

9/10

/10

0.00

18/1

1/10

0.0

0

28/1

2/10

0.0

0

6/2/

11 0

.00

18/3

/11

0.00

27/4

/11

0.00

6/6/

11 0

.00

16/7

/11

0.00

25/8

/11

0.00

4/10

/11

0.00

13/1

1/11

0.0

0

23/1

2/11

0.0

0

1/2/

12 0

.00

12/3

/12

0.00

21/4

/12

0.00

31/5

/12

0.00

10/7

/12

0.00

19/8

/12

0.00

28/9

/12

0.00

7/11

/12

0.00

17/1

2/12

0.0

0

26/1

/13

0.00

7/3/

13 0

.00

0.0000000000

0.0020000000

0.0040000000

0.0060000000

0.0080000000

0.0100000000

0.0120000000

0.0140000000

Integrated Dose (Sv)

Integrated Dose (Sv)

Integrated Dose 2010-2013 (Sv) – PMIL2511

Page 11: SSD SEU  Candidates Investigation

DDL 513 – Event 131

/7/1

2 13

.55

31/7

/12

14.2

4

31/7

/12

14.5

2

31/7

/12

15.2

1

31/7

/12

15.5

0

31/7

/12

16.1

9

31/7

/12

16.4

8

31/7

/12

17.1

6

31/7

/12

17.4

5

31/7

/12

18.1

4

31/7

/12

18.4

3

31/7

/12

19.1

2

31/7

/12

19.4

0

31/7

/12

20.0

9

31/7

/12

20.3

8

31/7

/12

21.0

7

31/7

/12

21.3

6

31/7

/12

22.0

4

31/7

/12

22.3

3

31/7

/12

23.0

2

31/7

/12

23.3

1

1/8/

12 0

.00

1/8/

12 0

.28

1/8/

12 0

.57

0

200

400

600

800

1000

1200

1400

1600

1800

Measures Dose (uSv/h)

Measured Dose (uSv/h)

Page 12: SSD SEU  Candidates Investigation

DDL 513 – Event 219

/11/

12 1

1.31

19/1

1/12

12.

00

19/1

1/12

12.

28

19/1

1/12

12.

57

19/1

1/12

13.

26

19/1

1/12

13.

55

19/1

1/12

14.

24

19/1

1/12

14.

52

19/1

1/12

15.

21

19/1

1/12

15.

50

19/1

1/12

16.

19

19/1

1/12

16.

48

19/1

1/12

17.

16

19/1

1/12

17.

45

19/1

1/12

18.

14

19/1

1/12

18.

43

0

200

400

600

800

1,000

1,200

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 13: SSD SEU  Candidates Investigation

DDL 513 – Event 37/

2/13

0.0

0

7/2/

13 4

.48

7/2/

13 9

.36

7/2/

13 1

4.24

7/2/

13 1

9.12

8/2/

13 0

.00

8/2/

13 4

.48

8/2/

13 9

.36

8/2/

13 1

4.24

8/2/

13 1

9.12

9/2/

13 0

.00

9/2/

13 4

.48

9/2/

13 9

.36

9/2/

13 1

4.24

0

500

1,000

1,500

2,000

2,500

3,000

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 14: SSD SEU  Candidates Investigation

DDL 514 – Event 13/

8/11

4.4

8

3/8/

11 6

.00

3/8/

11 7

.12

3/8/

11 8

.24

3/8/

11 9

.36

3/8/

11 1

0.48

3/8/

11 1

2.00

3/8/

11 1

3.12

3/8/

11 1

4.24

3/8/

11 1

5.36

3/8/

11 1

6.48

3/8/

11 1

8.00

3/8/

11 1

9.12

3/8/

11 2

0.24

0

100

200

300

400

500

600

700

800

900

1000

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 15: SSD SEU  Candidates Investigation

DDL 514 – Event 27/

9/11

14.

24

7/9/

11 1

4.52

7/9/

11 1

5.21

7/9/

11 1

5.50

7/9/

11 1

6.19

7/9/

11 1

6.48

7/9/

11 1

7.16

7/9/

11 1

7.45

7/9/

11 1

8.14

7/9/

11 1

8.43

7/9/

11 1

9.12

7/9/

11 1

9.40

7/9/

11 2

0.09

7/9/

11 2

0.38

7/9/

11 2

1.07

7/9/

11 2

1.36

0

20

40

60

80

100

120

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 16: SSD SEU  Candidates Investigation

DDL 514 – Event 330

/10/

12 2

3.31

31/1

0/12

0.0

031

/10/

12 0

.28

31/1

0/12

0.5

731

/10/

12 1

.26

31/1

0/12

1.5

531

/10/

12 2

.24

31/1

0/12

2.5

231

/10/

12 3

.21

31/1

0/12

3.5

031

/10/

12 4

.19

31/1

0/12

4.4

831

/10/

12 5

.16

31/1

0/12

5.4

531

/10/

12 6

.14

31/1

0/12

6.4

331

/10/

12 7

.12

31/1

0/12

7.4

031

/10/

12 8

.09

31/1

0/12

8.3

831

/10/

12 9

.07

31/1

0/12

9.3

631

/10/

12 1

0.04

31/1

0/12

10.

3331

/10/

12 1

1.02

31/1

0/12

11.

3131

/10/

12 1

2.00

31/1

0/12

12.

2831

/10/

12 1

2.57

31/1

0/12

13.

2631

/10/

12 1

3.55

0

500

1000

1500

2000

2500

3000

3500

4000

4500

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 17: SSD SEU  Candidates Investigation

DDL 516 – Event 129

/1/1

3 2.

24

29/1

/13

4.48

29/1

/13

7.12

29/1

/13

9.36

29/1

/13

12.0

0

29/1

/13

14.2

4

29/1

/13

16.4

8

29/1

/13

19.1

2

29/1

/13

21.3

6

30/1

/13

0.00

30/1

/13

2.24

30/1

/13

4.48

30/1

/13

7.12

30/1

/13

9.36

30/1

/13

12.0

0

30/1

/13

14.2

4

0

1000

2000

3000

4000

5000

6000

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 18: SSD SEU  Candidates Investigation

DDL 519 – Event 129

/1/1

3 2.

24

29/1

/13

4.48

29/1

/13

7.12

29/1

/13

9.36

29/1

/13

12.0

0

29/1

/13

14.2

4

29/1

/13

16.4

8

29/1

/13

19.1

2

29/1

/13

21.3

6

30/1

/13

0.00

30/1

/13

2.24

30/1

/13

4.48

30/1

/13

7.12

30/1

/13

9.36

30/1

/13

12.0

0

30/1

/13

14.2

4

0

1000

2000

3000

4000

5000

6000

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 19: SSD SEU  Candidates Investigation

DDL 521 – Event 111

/7/1

0 20

.09

11/7

/10

20.3

8

11/7

/10

21.0

7

11/7

/10

21.3

6

11/7

/10

22.0

4

11/7

/10

22.3

3

11/7

/10

23.0

2

11/7

/10

23.3

1

12/7

/10

0.00

12/7

/10

0.28

12/7

/10

0.57

12/7

/10

1.26

12/7

/10

1.55

12/7

/10

2.24

12/7

/10

2.52

12/7

/10

3.21

12/7

/10

3.50

0

5

10

15

20

25

Measured Dose (uSv/h)

Measured Dose (uSv/h)

The Log entry was written at 2.52 am (12/07/2010), but according to the logbook the problems started at least around 1 am.

Page 20: SSD SEU  Candidates Investigation

DDL 523 – Event 17/

2/13

0.0

0

7/2/

13 4

.48

7/2/

13 9

.36

7/2/

13 1

4.24

7/2/

13 1

9.12

8/2/

13 0

.00

8/2/

13 4

.48

8/2/

13 9

.36

8/2/

13 1

4.24

8/2/

13 1

9.12

9/2/

13 0

.00

9/2/

13 4

.48

9/2/

13 9

.36

9/2/

13 1

4.24

0

500

1,000

1,500

2,000

2,500

3,000

Measured Dose (uSv/h)

Measured Dose (uSv/h)

Page 21: SSD SEU  Candidates Investigation

Dose absorbed when the SEU happened(PMIL2513 – PM2511)

• DDL 521: 0.0076 Sv – 0.00055 Sv (this DDL is on I side but this value is measured on the A side. Not sure if there is a RAMSES on I side)

• DDL 514:– 1 event: 0.474 Sv – 0.0079 Sv (Probably solved just with a power cycle)– 2 event: 0.606 Sv – 0.0082 Sv (ie 0.132 Sv – 0.0003 Sv wrt event 1)– 3 event: 1.998 Sv – 0.0115 Sv (ie 1.396 Sv – 0.0033 Sv wrt event 2)

• DDL 513:– 1 event: 1.357 Sv – 0.0108 Sv– 2 event: 2.356 Sv – 0.0117 Sv (ie 1.000 Sv – 0.0009 Sv wrt event 1)– 3 event: 3.004 Sv – 0.0124 Sv (ie 0.648 Sv – 0.0007 Sv wrt event 2)

• DDL 516: 2,797 Sv – 0.0123 Sv• DDL 519: 2.855 Sv – 0.0123 Sv• DDL 523: 2.982 Sv – 0.0124 Sv (this DDL is on I side but this value

is measured on the A side. Not sure if there is a RAMSES on I side)

Page 22: SSD SEU  Candidates Investigation

Total Instantaneous Luminosity20

09-1

2-03

00:

00:0

0.00

0

2010

-01-

22 0

0:00

:00.

000

2010

-03-

13 0

0:00

:00.

000

2010

-05-

02 0

0:00

:00.

000

2010

-06-

21 0

0:00

:00.

000

2010

-08-

10 0

0:00

:00.

000

2010

-09-

29 0

0:00

:00.

000

2010

-11-

18 0

0:00

:00.

000

2011

-01-

07 0

0:00

:00.

000

2011

-02-

26 0

0:00

:00.

000

2011

-04-

17 0

0:00

:00.

000

2011

-06-

06 0

0:00

:00.

000

2011

-07-

26 0

0:00

:00.

000

2011

-09-

14 0

0:00

:00.

000

2011

-11-

03 0

0:00

:00.

000

2011

-12-

23 0

0:00

:00.

000

2012

-02-

11 0

0:00

:00.

000

2012

-04-

01 0

0:00

:00.

000

2012

-05-

21 0

0:00

:00.

000

2012

-07-

10 0

0:00

:00.

000

2012

-08-

29 0

0:00

:00.

000

2012

-10-

18 0

0:00

:00.

000

2012

-12-

07 0

0:00

:00.

000

2013

-01-

26 0

0:00

:00.

000

2013

-03-

17 0

0:00

:00.

000

2013

-05-

06 0

0:00

:00.

000

-10000.0000000000

10000.0000000000

30000.0000000000

50000.0000000000

70000.0000000000

90000.0000000000

110000.0000000000

130000.0000000000Total Istantaneous Luminosity (ub s)^-1

Total Istantaneous Luminos-ity (ub s)^-1

Page 23: SSD SEU  Candidates Investigation

Total Instantaneous Luminosity (Zoom)

2009

-12-

03 0

0:00

:00.

000

2010

-01-

22 0

0:00

:00.

000

2010

-03-

13 0

0:00

:00.

000

2010

-05-

02 0

0:00

:00.

000

2010

-06-

21 0

0:00

:00.

000

2010

-08-

10 0

0:00

:00.

000

2010

-09-

29 0

0:00

:00.

000

2010

-11-

18 0

0:00

:00.

000

2011

-01-

07 0

0:00

:00.

000

2011

-02-

26 0

0:00

:00.

000

2011

-04-

17 0

0:00

:00.

000

2011

-06-

06 0

0:00

:00.

000

2011

-07-

26 0

0:00

:00.

000

2011

-09-

14 0

0:00

:00.

000

2011

-11-

03 0

0:00

:00.

000

2011

-12-

23 0

0:00

:00.

000

2012

-02-

11 0

0:00

:00.

000

2012

-04-

01 0

0:00

:00.

000

2012

-05-

21 0

0:00

:00.

000

2012

-07-

10 0

0:00

:00.

000

2012

-08-

29 0

0:00

:00.

000

2012

-10-

18 0

0:00

:00.

000

2012

-12-

07 0

0:00

:00.

000

2013

-01-

26 0

0:00

:00.

000

2013

-03-

17 0

0:00

:00.

000

2013

-05-

06 0

0:00

:00.

000

0.0000000000

50.0000000000

100.0000000000

150.0000000000

200.0000000000

250.0000000000

300.0000000000

350.0000000000

400.0000000000

450.0000000000

500.0000000000Total Istantaneous Luminosity (ub s)^-1 (Zoom)

Total Istantaneous Luminos-ity (ub s)^-1

Page 24: SSD SEU  Candidates Investigation

Total Integrated Luminosity20

09-1

2-03

00:

00:0

0.00

0

2010

-01-

22 0

0:00

:00.

000

2010

-03-

13 0

0:00

:00.

000

2010

-05-

02 0

0:00

:00.

000

2010

-06-

21 0

0:00

:00.

000

2010

-08-

10 0

0:00

:00.

000

2010

-09-

29 0

0:00

:00.

000

2010

-11-

18 0

0:00

:00.

000

2011

-01-

07 0

0:00

:00.

000

2011

-02-

26 0

0:00

:00.

000

2011

-04-

17 0

0:00

:00.

000

2011

-06-

06 0

0:00

:00.

000

2011

-07-

26 0

0:00

:00.

000

2011

-09-

14 0

0:00

:00.

000

2011

-11-

03 0

0:00

:00.

000

2011

-12-

23 0

0:00

:00.

000

2012

-02-

11 0

0:00

:00.

000

2012

-04-

01 0

0:00

:00.

000

2012

-05-

21 0

0:00

:00.

000

2012

-07-

10 0

0:00

:00.

000

2012

-08-

29 0

0:00

:00.

000

2012

-10-

18 0

0:00

:00.

000

2012

-12-

07 0

0:00

:00.

000

2013

-01-

26 0

0:00

:00.

000

2013

-03-

17 0

0:00

:00.

000

2013

-05-

06 0

0:00

:00.

000

-10000.0000000000

10000.0000000000

30000.0000000000

50000.0000000000

70000.0000000000

90000.0000000000

110000.0000000000

130000.0000000000Total Integrated Luminosity (ub)^-1

Total Integrated Luminosity (ub) -̂1

Page 25: SSD SEU  Candidates Investigation

Integrated Dose / Integrated Luminosity20

09-1

2-03

00:

00:0

0.00

0

2010

-01-

22 0

0:00

:00.

000

2010

-03-

13 0

0:00

:00.

000

2010

-05-

02 0

0:00

:00.

000

2010

-06-

21 0

0:00

:00.

000

2010

-08-

10 0

0:00

:00.

000

2010

-09-

29 0

0:00

:00.

000

2010

-11-

18 0

0:00

:00.

000

2011

-01-

07 0

0:00

:00.

000

2011

-02-

26 0

0:00

:00.

000

2011

-04-

17 0

0:00

:00.

000

2011

-06-

06 0

0:00

:00.

000

2011

-07-

26 0

0:00

:00.

000

2011

-09-

14 0

0:00

:00.

000

2011

-11-

03 0

0:00

:00.

000

2011

-12-

23 0

0:00

:00.

000

2012

-02-

11 0

0:00

:00.

000

2012

-04-

01 0

0:00

:00.

000

2012

-05-

21 0

0:00

:00.

000

2012

-07-

10 0

0:00

:00.

000

2012

-08-

29 0

0:00

:00.

000

2012

-10-

18 0

0:00

:00.

000

2012

-12-

07 0

0:00

:00.

000

2013

-01-

26 0

0:00

:00.

000

2013

-03-

17 0

0:00

:00.

000

2013

-05-

06 0

0:00

:00.

000

-0.000199999999999999

1.21972744404619E-18

0.000200000000000001

0.000400000000000001

0.000600000000000001

0.000800000000000001

0.001

0.0012

0.0014

0.0016

0.0018

Ratio Integrated Dose/Integrated Luminosity (Sv ub)

Ratio Integrated Dose/Integrated Lu-minosity (Sv ub)

Page 26: SSD SEU  Candidates Investigation

Conclusions

• Some cases clearly associated to a peak in the radiation measured appeared just before the event:– DDL 513 event 1, DDL 514 events 2 and 3

• Almost all the others happened during STABLE BEAMS but no evident peak in the measured dose wrt immediately before or after.

• Which action has to be taken?