The result of GoldenDOM The result of GoldenDOM CalibrationCalibration

Hiroko MiyamotoT.Noda, S.Yoshida, K.Mase

K.Hoshina, M.Krasberg, K.Hanson, C.Rott

Chiba University, UW Madison, PSU

Who is doing what?

Chiba University Hiroko, Keiichi, Tsuyoshi, Shigeru

UW-MadisonKael, Mark, Chris and FAT people…

PSU

Carsten, Martin

Contents

Golden PMT calibration @ Chiba 　 Golden DOM calibration @ Chiba (useful LC circuit!) DOM vs PMT? Schedule

Golden PMT/DOM production and calibration

2004,Nov

Hamamatsu

Chiba

Madison

SouthPole

Hamamatsu PMT QE calibration

2005,Jun. Jul. Aug. Sep. Oct. Nov. Dec.

Chiba PMT calibration

FAT#8

Chiba DOM calibration

2005/06 deployment

IceCube Golden PMT/DOM calibrations at Chiba

[PMT] Low Temperature (-32C) Gain Waveform Noise Rate

Room Temperature Relative Collection Efficiency (2π) Absolute QExCE Efficiency (1 slice)

http://www.ppl.phys.chiba-u.jp/research/IceCube/pmt/GoldenPMT/for GoldenPMT calibration 2005

[DOM]Room Temperature Relative Collection Efficiency (4π) Absolute Efficiency (1 point)

Hakkenden (“eight” dog) Warriors….? DOM name PMT #Sosuke_Inukawa : TA1181 --failedDosetsu_Inuyama : TA1069 Shino_Inuzuka : TA1052Genpachi_Inukai : TA1167Kobungo_Inuta : TA1062Keno_Inuzaka : TA1056 --failedShinbei_Inue : TA1059Daikaku_Inuyama : TA1176 --failed

2D PMT Scan

Data library available Implemented in the detector MC

2D CE map ITA1052

TA1059 TA1062

2D CE map II

TA1069 TA1167

PMT absolute calibration

Chamber and DAQ

ATTENUATOR

PressuremeterTemp

monitor

Energy meter Numerical calculation

Typically,

~ 4x109 x 5x10-11 ~ 0.2

QExCE(absolute efficiency) = photoelectron # / cathode hit photon #

cathode hit photon # ~ initial photon# x aperture x Cross Section

Estimate incidental photon #.

Pedestal subtraction

2DCE combined with 2D absolute QExCE

HAMAMATSU QE vs Chiba QExCE

Golden DOM calibration

How useful external trigger is? SPE-based measurement SPE-based study is very important and fundamental, but we can’t see SPE signals from light source because of the bunch of noise Control trigger rate You don’t need to take 10 kHz dark noises anymore but signals at a rate just as

you like Standalone operation DOM can take the data from the light source by itself alternatively (you don’t need other DOMs or MB anymore) After pulse measurement You can trigger anytime you like, which enables you to see after pulses

Absolute efficiency measurement for DOM

Same setup as for PMT (with 337nm N2 laser), except:

2000 incidental photons (increase the laser luminosity)

N2 laserN2

Shino_InuzukaShino_Inuzuka POS.1

POS.2 POS.3

POS.1

POS.2 POS.3

DOM surface

~2cm

PMT- ID PMT- Qecenter[%] HPK- QE[%] DOM- name QE- pos1[%] QE- pos2[%] QE- pos3[%] DOM- QEcenter[%]TA1052 21.1 20.97 Shino_Inuzuka 7.9 8.3 8.3 8.2TA1059 19.2 18.86 Shinbei_Inue 6.9 6.9 6.9 6.9TA1062 20.5 20.8 Kobungo_Inuta 9.7 9.6 9.5 9.6TA1069 20.0 20.3 Dosetsu_Inuyama 8.3 8.4 8.5 8.4TA1167 19.4 18.89 Genpachi_Inukai 7.7 7.7 8.0 7.8

HPQ(340nm) vs CHIBA(337nm)

y = 1.2448x - 4.9814

18.5

19

19.5

20

20.5

21

21.5

19 20 21 22

HPK- QE[%]

CHIB

A-PM

T-QE

cen

ter[%

]

1系列 ( 1)線形 系列

PMT- Eff. vs DOM- Eff.

0.0

2.0

4.0

6.0

8.0

10.0

12.0

19 19.5 20 20.5 21 21.5

CHIBA PMT Eff.[%]

DOM

Eff.[%

]

Shino_InuzukaShinbei_InueKobungo_InutaGenpachi_InukaiGenpachi_Inukai

PMT-Eff. vs DOM-Eff.

0.0

2.0

4.0

6.0

8.0

10.0

12.0

19 19.5 20 20.5 21 21.5

CHIBA PMT Eff.[%]

DO

M E

ff.[%

] Shino_InuzukaShinbei_InueKobungo_InutaGenpachi_InukaiGenpachi_Inukai

PMTs vs DOMs (Preliminary)

DOM efficiency

+

Acceptance()

Glass/gel transmittance

DOM 2D 4 scan

Map out the detectionefficiency

Combine DOM absolute efficiency and DOM 2D scanning map!

2D Scanning System for DOM

Dosetsu_Inuyama

Very very preliminary!

By the way…

Quad-LC signal works very well as a event trigger.

Cosmic μ(bkg)

Rayleigh scatteredPhoton signal peak

Externally triggeredLED signal,no bkg

How about next year?

We are providing another set of 8 Golden DOMs next year.Chiba calibrate and ship them to UW via Hamamatsu in May 2006 for FAT in May or June.

Any idea for this year?(with 5 Golden DOMs…)

For example….

Discussion

Ice Layer

Genpachi_Inukai

Shinbei_Inue

Kobungo_Inuta

Dosetsu_Inuyama

Kobungo_Inuta

Shinbei_Inue

Shino_InuzukaShino_Inuzuka

Genpachi_Inukai

2D CE map ITA1052

TA1059 TA1062

2D CE map IITA1069 TA1167

HPQ(340nm) vs CHIBA(337nm)

y = 1.2448x - 4.9814

16.5

17.5

18.5

19.5

20.5

21.5

22.5

23.5

19 19.5 20 20.5 21 21.5

HPK-QE[%]

CH

IBA

-PM

T-Q

E c

ente

r[%]

HPK vs CHIBA