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V0C. V0A. PM and shoebox tests. Hamamatsu 19 and 16 dynodes compared to FEU 187 15 dynodes Jyväskylä’s shoebox (T0). HT. 25 m. FI/FO. FI/FO. QDC. ped qdc. 5 m. PM. FA. start. anode. ped disc. THR1. TDC1. 25 m. thr1. optical fibers. gate. THR2. TDC2. thr2. 30 ns.

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pm and shoebox tests

V0C

V0A

PM and shoebox tests
  • Hamamatsu 19 and 16 dynodes compared to

FEU 187 15 dynodes

  • Jyväskylä’s shoebox (T0)
electronics for mip measurements

HT

25 m

FI/FO

FI/FO

QDC

pedqdc

5 m

PM

FA

start

anode

peddisc

THR1

TDC1

25 m

thr1

optical fibers

gate

THR2

TDC2

thr2

30 ns

THR3

TDC3

thr3

V0 counter

THR4

TDC4

thr4

17 p.e./MIP

Electronics for MIP measurements
feu 187 gain

18

14

15

20

19

21

FEU 187 gain

hamamatsu and feu 187 gain

19 dynodes

Hamamatsu

16 dynodes

FEU 187

15 dynodes

Hamamatsu and FEU 187 gain

hamamatsu feu 187

16

17

15

Hamamatsu / FEU 187
  • MIP measurement at equal gain
  • 17 p.e. for the most probable charge
  • 12 pC / 60 mV
  • charge = MIP / 4 for Hamamatsu PMT
  • charge = MIP / 2 for Russian PMT
  • time (Ham.) = 1.5 time (FEU 187)
  • a threshold at 2 charge (98%)
  • - MIP / 2 mV for Hamamatsu (30 mV)
  • - 0 for FEU 187
  • Hamamatsu will be selected for V0
time versus discriminator threshold

17 p.e.

2 > 0 mV

FEU 187

MIP amplitude > 60 mV

2 > 30 mV

Ham.

dynamics: 3 mV-3 V

time versus discriminator threshold

mip versus discriminator threshold

17 p.e.

2 MIP efficiency

Maximum efficiency

MIP versus discriminator threshold
h6153 70 r5946 hv divider

H6153-70 = R5946 + HV divider (+)

  • PMT and divider in

in a common cylinder

  • makes the mounting easy
  • simplifies the mechanics
electronics for tests with the schoebox

HT

25 m

A10/A25

FI/FO

QDC

pedqdc

5 m

PM

start

A1

anode

peddisc

THR1

TDC1

25 m

thr1

optical fibers

THR2

TDC2

gate

thr2

30 ns

shoebox

THR3

TDC3

thr3

V0 counter

THR4

TDC4

thr4

17 p.e./MIP

CFD

TDC4

thr

Electronics for tests with the schoebox
measurement with the shoebox
Measurement with the shoebox
  • 16 dynodes Hamamatsu tube
  • Charge distributions as a function of

- high voltage: 1400, 1600, 1750, 1800, 2000, 2200

- amplification factor: 1, 10, 25

  • Time resolution with amplification 10 and threshold / constant fraction discriminators as a function of

- high voltage: 1400, 1600, 1800, 2000, 2200

  • Extraction of the time resolution values still to be carried out
charge distributions at 1400 v from 16 dynodes hamamatsu pmt

Without shoebox

HT= 1400 V, A=1

HT= 1400 V, A=1

HT= 1400 V, A=25

HT= 1400 V, A=10

Charge distributions at 1400 V from 16 dynodes Hamamatsu PMT
t0 schoebox as described in tdr

100 ohms

To TRD

wake-up

G=3.2

To T0 FEE

threshold disri.

and QDC

50 ohms

G=3.2

G=3.2

Anode

PM

signal

50 ohms

To T0 FEE

CFD

T0 schoebox as described in TDR
v0 pulse treatment

Signal amplitude

30 mV – 1. V

(50 mV – 1. V)

Signal amplitude

Signal charge

Signal charge

6 pC - >200 pC

6 pC - >200 pC

9.5 mV – 300 mV

(10 pC - >200 pC)

(10 pC - >200 pC)

(16 mV – 300 mV)

Signal amplitude

3 mV – 3 V

(5 mV – 5 V)

100 ohms

To TRD

wake-up

G=3.2

G=3.2

To V0 FEE

threshold disri.

50 ohms

G=3.2

OR

NINO

Anode

PM

(0.1 – 2 pC)

2 ns

shaper

signal

50 ohms

G=1

To V0 FEE

QDC

Signal charge

Signal amplitude

0.6 pC - 600 pC

3 mV – 3 V

(1 pC - 1000 pC)

(5 mV – 5 V)

V0 pulse treatment
conclusion
Conclusion
  • Choice of the Hamamatsu PMT 16 dynodes
  • gain = 3 106 at 2000 V (FEU = 3 105)
  • charge resolution = MIP/4 (FEU = MIP/2)
  • time resolution (MIP = 17 p.e.) < 1 ns at 1750 V (FEU # 1.4 ns)
  • Choice of the T0 shoebox with an amplification of 10
  • direct signal to QDC
  • amplified (clamped) signal to discriminator
present programme
Present programme
  • Order of:
  • VME crate: 15/12/2004
  • 70 systems H6153-70 (PM5946-70 + HT divider): 15/12/2004

- delivery: 10 (06/2005), 20 (07/2005), 20 (08/2005), 20 (09/2005)

  • scintillator BC404: 15/12/2004
  • shifting fibers: 15/12/2004
  • optical fibers: 15/12/2004
  • Sector  ’’0’’:
  • available: 03/2005
  • tested: 04/2005
  • design review: 04/2005
  • Sectors ’’1’’ - ’’7’’ + V0C box + V0C fiber cables
  • available: 11/2005
  • tested: 12/2005
  • PM characterisation:
  • gain curves: 12/2005
  • V0C ready end of 2005
  • V0A ready in June 2006
  • Electronics R&D: follows the time-table (TDR)
  • CIU prototype tested: end 2004
spectral response

Hamamatsu

Hamamatsu / FEU 187

Spectral response

recommendation for the hv sign

Recommendation for the HV sign

1) The R5505-70 and the R5946-70 are for +HV operation.

>

> We usually recommend +HV operation for all of the Fine Mesh PMTs. The

> reason is as follows:

>

> Basically, there is no difference in PMT itself between -HV model and

> +HV model. When a fine mesh PMT is operated at -HV, it sometimes

> generates large noises. This is due to discharge between electrodes

> (former stages of dynodes), the bulb and supporting materials outside.

> Fine mesh PMT has proximity configuration, the electrodes are set

> close to the window and the bulb. When -HV is used, potential of these

> electrodes become -HV. There could be large potential difference

> somewhere around window. In case of +HV operation, as cathode is

> grounded, there is less potential difference between electrodes, the

> bulb and supporting materials. Therefore noise becomes less. We would

> like to recommend +HV operation for all customers.

slide25

1. Here is the anode dark current stability data of the R5946 (1.5« Fine Mesh PMT). The horizontal axis is operating time and the verticalaxis is the anode dark current recorded by ampere meter and recorder(10 mV = 100 nA). The upper data was measured at -HV operation and thelower one was measured at +HV operation. The PMT was supported by itssocket, and there was nothing around the PMT bulbs. Spike noisesappeared at -HV operation. However,when it was used at +HV operation,the noise became less.

waveform of the pulse

Waveform of the pulse

2. We checked the waveform of the R5505(1 inch Fine Mesh PMT) and thefollowing is its data. Blue curve is at -HV operation and pink one isat +HV operation. Although the overshoot was rather seen at +HV, it'snot so much.

Therefore, we would like to recommend +HV operation.