Collaboration Meeting CERN, 6-10 Feb 2012 Collaboration Meeting CERN, 6-10 Feb 2012 Agustín...

Update on time calibration with optical beacons

Collaboration MeetingCERN, 6-10 Feb 2012

Agustín Sánchez LosaIFIC (CSIC – Universitat de València)

Outline

• Reminder of the time calibration with OBs• Time calibrations performed since Moscow

meeting– Intraline calibration: T0s

• #9 (after HV Jun’11)• #10 (after HV Dec’11)• LED-OB 1263 (L09F21): Chronicle of a Death Foretold

– Interline calibration: Time offsets• #8 (after L6 & L9 reconnection and HV Nov’10)• #9 (after HV Jun’11)

• To-Do List6-10 Feb 2012 Agustín Sánchez Losa – CERN Collaboration Meeting 2

6-10 Feb 2012 Agustín Sánchez Losa – CERN Collaboration Meeting 3

Time calibration recipe:– Flash various OMs at the same time by an OB– Plot the distribution of hit arrival times for each ARS– Fit such distribution with a Gauss@Exponential function– Determine Tpeak , the time of the function peak

– Plot Tpeak vs distance– Deviations from the straight line fit will be used as corrections to the T0s

F 2

F 3

F 4

F 5

F 6

F 7

F 8

F 9

F 10

F 1

Reminder of the time calibration

waterOBOM c

OMOBdttt

),(


LED

LED

Laser


• T0 in the same line• LED OB• Early-photon region

Intraline calibration

• time offsets between lines• Laser OB• Photo-electron level region

Interline calibration

6-10 Feb 2012 Agustín Sánchez Losa – CERN Collaboration Meeting

• Scheme of the automatic calibration:

– Human intervention needed at the end of the process to check the output and the most problematic corrections in case of T0s calibration

run file & calibration

(time & alignment)

Fill time OB-OM

histogramsTpeak

T0s

Time offsetsProcessing run Autobinning

Intraline

Interline


5


IntralineT0s in the same line by means of the

LED OBs

6

7

T0s#1

5 Lines#2

10 Lines#3

12 Lines#4HV #5 #6

L10-L12+offsetsG/2 G/4 #7

HV#8

L6-L9+HV#9HV

#10HV

29/Jan/2007 07/Dec/2007 30/May/2008 13/Aug/2009 07/Nov/2009 13/Nov/2009 22/Jun/2010 23/Jun/2010 13/Jul/2010 06/Nov/2010 29/Jun/2011 12/Dec/2011

~10 months ~7 months ~15,5 months ~3 months ~5 days ~8 months - - ~4,5 months ~7 months ~8 months ~4,5 months

10.746.202(NO OFFSETS)












54.497.692(mix PACO-AART)

54.497.693 (mix PACO-AART)



59.246.765 (#6)

59.223.340 (#6)

61.464.136 (#7)

61.464.151 (#7)

60.410.605 (#7)

61.419.526 (#8pre)

60.419.546 (BAD PATCHED)


60.459.844 (PATCHED)

60.459.865 (PATCHED)


Intraline: T0s tables in the DB• Two new Intraline calibrations (T0s without offsets):

– #9 (after HV Jun’11)– #10 (after HV Dec’11)

#1 #2 #3 #5#4 #6 #7 #8

5 Lines 10 Lines 12 Lines HV L10-L12+offsets HV L6-L9+HV

G/N

HVHV

#9 #10


Intraline (#9): new T0s for #9 period (After HV Jun'11)

• Intraline calibration performed with:– 24 standard LED-OB calibration runs of 29/06/2011– “2011:V1.0” online calibration

• LED-OBs not available: L09S21, L10S21, L11S02, L11S21, L12S15

• More info available at:http://ific.uv.es/~agusanlo/calibrations/intratical_9/

8



• Corrections summary:

– 526 ARSs couldn't be corrected (no data or dead channel) – 8 ARSs couldn't be corrected (not suitable for time calibration) – 1236 ARSs were corrected: (70%)

• 1023 less than 1ns (83% of corrected)• 141 between 1ns and 2ns (11% of corrected)• 60 between 2ns and 5ns (5% of corrected)• 12 more than 5ns (1% of corrected)

– And 30 ARSs are in a pair corrected more than 1ns: (2% of corrected)• 26 less than 2ns• 4 between 2ns and 5ns• 0 more than 5ns

– 6 were fitted and corrected by hand (0.4%)9



• 8 ARS were not corrected: they are not suitable for time calibration

10

(L03 F14 ARS2)

(L03 F14 ARS3)

L07 F13 ARS4

(L07 F13 ARS5)

(L11 F11 ARS4)

(L11 F11 ARS5)time (ns)

N

N

time (ns)

N

time (ns)

L08 F15 ARS1 L07 F17 ARS4


Intraline Example of sections 1-4 for line 1

(2 runs of 29/06/2011)

Section 2Floor 11-16 (11-17)

Section 1Floor 4-10


Section 4Floor 23-25

#9


Intraline Corrections and Clock-Phases

72 out of 1236 have required corrections

larger than 2ns:6 %

Clockphases stable below

~0.1ns

#9

12


Intraline (#10): new T0s for #10 period (After HV Dec'11)

• Intraline calibration performed with:– 24 standard LED-OB calibration runs of 16/01/2012– “2011:V4.0” online calibration

• LED-OBs not available: L09S21, L10S21, L11S02, L11S21, L12S15

• More info available at:http://ific.uv.es/~agusanlo/calibrations/intratical_10/

13



• Corrections summary:

– 516 ARSs couldn't be corrected (no data or dead channel) – 9 ARSs couldn't be corrected (not suitable for time calibration) – 1245 ARSs were corrected: (70%)

• 1094 less than 1ns (88% of corrected)• 105 between 1ns and 2ns (8% of corrected)• 38 between 2ns and 5ns (3% of corrected)• 8 more than 5ns (1% of corrected)

– And 20 ARSs are in a pair corrected more than 1ns: (2% of corrected)• 14 less than 2ns• 6 between 2ns and 5ns• 0 more than 5ns

– 7 were fitted and corrected by hand (0.4%)14



• 8 ARS were not corrected: they are not suitable for time calibration

15

L02 F10 ARS2

(L02 F10 ARS3)

(L03 F14 ARS2)

(L03 F14 ARS3)

(L07 F13 ARS4)

(L07 F13 ARS5)time (ns)

N N

time (ns)

L11 F11 ARS4

Unbalanced section #4 of line 5


Intraline Example of sections 1-4 for line 1

(2 runs of 16/01/2012)


Section 1Floor 4-10


Section 4Floor 23-25

#10


Intraline Corrections and Clock-Phases

46 out of 1245 have required corrections

larger than 2ns:4 %

Clockphases stable below

~0.1ns

#10

17

Intraline LED-OB 1263 (L09F21): Chronicle of a Death Foretold

L09F21 LED-OB was a noisy OB:• the trigger in OB PMT was given by clock signal

noise (thanks Paco and Ciro)• flash time was given ~75ns before it should• “time difference signal” shifted close to the end

of the time window• Decided to add -75ns to the OB t0 for practical

reasons

ADC ~48ch

(~75ns)

time (ch)

V (c

h)

MAX_TRIG_TH0 ~255mV → ADC ~186ch

time (ns)

N

CERN’11

15/12/2010


L09 S23 ARS0

15/12/2010time (ns)

N

01/02/2011time (ns)

N

07/02/2011time (ns)

N


-75ns -75ns -75ns

L09 S23 ARS0

Intraline LED-OB 1263 (L09F21): Chronicle of a Death Foretold

time (ns)

N

29/06/2011time (ns)

N

+75ns

-75ns

16/01/2012


InterlineTime offsets between lines by means

of the Laser OB

20

21

T0s#1

5 Lines#2

10 Lines#3

12 Lines#4HV #5 #6

L10-L12+offsetsG/2 G/4 #7

HV#8

L6-L9+HV#9HV

#10HV

29/Jan/2007 07/Dec/2007 30/May/2008 13/Aug/2009 07/Nov/2009 13/Nov/2009 22/Jun/2010 23/Jun/2010 13/Jul/2010 06/Nov/2010 29/Jun/2011 12/Dec/2011

~10 months ~7 months ~15,5 months ~3 months ~5 days ~8 months - - ~4,5 months ~7 months ~8 months ~4,5 months













54.497.692(mix PACO-AART)




59.246.765 (#6)

59.223.340 (#6)

61.464.136 (#7)

61.464.151 (#7)

60.410.605 (#7)

61.419.526 (#8pre)

61.419.526 (#9)



94.288.297 (#8)

60.459.844 (PATCHED)

60.459.865 (PATCHED)


Interline: T0s tables in the DB• Two new Interline calibration (time offsets between lines):

– #8 (after L6 & L9 reconnection and HV Nov’10) and #9 (after HV Jun’11)– Completed all the periods until end 2011!

#1 #2 #3 #5#4 #6 #7 #8

5 Lines 10 Lines 12 Lines HV L10-L12+offsets HV L6-L9+HV

G/N

HVHV

#9 #10

Lines

#210 Lines

#312 Lines

#4HV

#5

#6L10-L12+offsets

#7HV

#8L6+L9+HV

#9HV

07/Dec/07 30/May/08 13/Aug/09 07/Nov/09 13/Nov/09 13/Jul/10 06/Nov/10 29/Jun/11

#2 #3A #3B #3C #4 -#6

(DIRTY)#6 #7 #8pre #8 #9

12 runs(25/02/08 → 12/05/08)

1 run(02/06/08)

10 runs(09/09/08 → 22/12/08)

29 runs(23/12/08

→ 12/08/09)

10 runs(01/09/09

→ 02/11/09)

-

26 runs(11/12/09

→ 12/07/10)

13 runs(11/12/09

→ 08/03/10)

14 runs(19/07/10

→ 25/10/10)

4 runs(24/11/10

→ 27/12/10)

26 runs(24/11/10

→ 03/06/11)

25 runs(19/06/11

→ 12/12/11)

PACO(0.992)

auto(0.992)

auto(0.994)

Not DonePACO(0.992)

AART(0.992)

AVERAGEPaco-Aart

auto(0.992)

auto(0.994)

DIFF(0.994-0.992)

auto auto - auto auto auto auto auto auto

1 -2,1 -2,1 -1,5 - -3,0 -2,28 -2,83 -3,0 -3,0 0,0 -3,0 -2,9 - -2,7 -2,7 -3,0 -2,3 -2,4 -2,62 -1,9 -2,1 -1,9 - -2,6 -2,12 -2,55 -2,6 -2,6 0,0 -2,6 -2,8 - -2,9 -3,0 -3,0 -2,9 -2,9 -3,03 0,8 0,5 0,9 - 0,3 -0,63 -0,36 0,1 0,1 0,0 -0,3 0,1 - 0,1 0,1 0,3 0,5 0,5 0,44 - - - - -1,7 -2,56 -2,32 -1,4 -1,5 -0,1 -1,6 -1,7 - -1,5 -1,6 -2,1 -2,1 -2,1 -2,05 -2,4 -2,2 -2,2 - -3,6 -3,31 -3,65 -3,5 -3,5 0,0 -3,5 -3,5 - -4,0 -4,0 -3,4 -3,2 -3,2 -3,46 -0,9 -0,9 -0,8 - -0,1 -1,10 -0,79 -0,5 -0,5 0,0 -0,3 0,3 - - - - -0,6 -0,3 -0,37 -0,2 -0,3 0,1 - -0,2 0,33 -0,13 -0,4 -0,4 0,0 -0,5 -0,8 - -0,7 -0,7 -0,7 -0,3 -0,5 -0,18 7,1 7,5 7,6 - 7,5 5,33 6,22 7,8 7,9 0,1 7,9 7,2 - 8,1 8,0 7,8 6,8 6,9 7,09 1,0 0,8 0,9 - 0,3 0.04 -0,02 0,0 0,0 0,0 0,2 - - - - - -0,8 -0,8 -1,0

10 -1,6 -1,3 -1,2 - -0,8 -1,00 -0,09 -0,9 -0,7 0,2 - - - -1,3 -1,2 -0,5 -0,3 -0,3 -0,211 - - - - 5,4 3,97 4,49 5,2 3,5 -1,7 3,6 4,3 - 3,9 4,0 4,1 3,9 4,1 4,412 - - - - 3,1 3,31 3,01 3,0 0,7 -2,3 0,4 - - 1,1 1,1 0,3 1,2 0,9 1,0

Mean

-0,02 -0,01 0,21 - 0,38 -0,01 0,08 0,32 0,00 -0,32 0,03 0,02 - 0,01 0,00 -0,02 -0,01 -0,01 0,00


Interline

DON’TPANIC

Line 19/07/2010 25/10/2010

03/11/2010 20/06/2011

29/06/2011 12/12/2011

1 - 3.0 ns - 2.4 ns - 2.6 ns2 - 3.0 ns - 2.9 ns - 3.0 ns3 + 0.3 ns + 0.5 ns + 0.4 ns4 - 2.1 ns - 2.1 ns - 2.0 ns5 - 3.4 ns - 3.2 ns - 3.4 ns6 ----- - 0.3 ns - 0.3 ns7 - 0.7 ns - 0.5 ns - 0.1 ns8 + 7.8 ns + 6.9 ns + 7.0 ns9 ----- - 0.8 ns - 1.0 ns

10 - 0.5 ns - 0.3 ns - 0.2 ns11 + 4.1 ns + 4.1 ns + 4.4 ns12 + 0.3 ns + 0.9 ns + 1.0 ns

#7 #8 #9

Interline


NEWNEW

Line 1

Line 2

L1 L2L3 L4 L6L5L7 L8L10L9

L11L12


L11L12

Example of interline(from 03/11/2010 to 20/06/2011)#8


Line 1

Line 2


L11L12


L11L12

Example of interline(from 29/06/2011 to 12/12/2011)#9



Interline: Best Laser vs Official offsets

Official offset

Validity period

Laser average ±1ns

Laser offset period

Laser offset RMS


To-Do List

• Intraline calibration by OB:– Compute intermediate T0s, starting for the ones from 2011– Recompute old T0s with updated TVCs and study the impact of using ones

or another– Research & Improvement on intraline calibration: Calibrate the first floors

of each line, study the impact of a calibration with independent sections, Study unstable PMTs since HV tuning in Summer'10, etc.

• Interline calibration by OB:– Research & Improvement on interline calibration: Keep studying time

offsets evolution along long periods, use LED-Beacons as a standard cross-check for the time offsets, impact of the noise in the line offset measurements, etc.

30

Thank youfor your attention

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