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Readout for the minical and Tile-HCAL prototype, 15’. The VFE RO: The light signals Photo-detectors 1) APD’s (Hamamatsu, ) 2) Si-PM’s (MEPhI) 3) MA-PMs(Hamamatsu) 4) MRS-APD’s(Obninsk) Preamplifiers, shaper charge sensitive (ECAL-LAL, Minsk) voltage sensitive (Prague)

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readout for the minical and tile hcal prototype 15
Readout for the minical and Tile-HCAL prototype, 15’
  • The VFE RO:
  • The light signals
  • Photo-detectors
    • 1) APD’s (Hamamatsu, )
    • 2) Si-PM’s (MEPhI)
    • 3) MA-PMs(Hamamatsu)
    • 4) MRS-APD’s(Obninsk)
  • Preamplifiers, shaper
    • charge sensitive (ECAL-LAL, Minsk)
    • voltage sensitive (Prague)
  • the electrical signals
    • 0-3Volt range,
    • dyn. range 1-75 (100) MIPs/cell
    • 20-40 ns rise
    • 150 ns (95%)
  • buffering and multiplexing
  • digitising
  • calibration and monitoring
  • The different photodetectors
  • front end electronics (VFE)
  • time schedule, needs
  • event format and DAQ (P.Daucey)

1. 2003 minical

2. 2004-2005:

pre-prototype Tile-HCAL

ECFA-DESY Workshop, NIKHEF

the light signals
The light signals
      • produced number of photons by MIP:
      • ~ 150 ph/MIP/tile, loss in fibre-RO: ~20%,
      • tile;
      • = 1/3 cell 1 (absorber plate+tile) deposes ~24 MeV
  • >> in a cell ~ 72 MeV
      • maximal energy deposit/cell ~ 4.5 GeV (in rare tails)
      • ratio maximum/MIP = 65

ECFA-DESY Workshop, NIKHEF

the photodetectors
The photodetectors

The photodetectors receive the light from

the scintillator tiles of the sampling calorimeter.

options studied are:

-Si-APD's, with 3x3 to 4x4 mm2 photo-cathodes,

in arrays of individuals or matrix assembly,

as in study at Hamamatsu, Japan and

-Si-PM's, with 1x1 to 2x2 mm2 photo-cathode,

from MEPhI/PULSAR(Moscow), 576 >>> 1000 pix/mm2

All systems are in still in development,

no dedicated choice can be made

at present.

ECFA-DESY Workshop, NIKHEF

required gain for pre amps 2 options
Required gain for pre-amps, 2 options
  • A) for APD’s:
  • 150 photons/tile = 450 photons/cell, ~80% transmission,
  • 80% photo-conversion efficiency:
  • possible intrinsic gain ~200-400 (to be verified)
  • >>> 15 000 - 30 000e-/ MIP= 7.2-14.4 fC/cell
  • conventional stable intrinsic gain ~50-100
  • >>> 4 000 - 8 000e-/ MIP= 1.8-3.6 fC/cell
  • slope/width of photodetector signal:
      • ~ 2-5ns/20-30 ns width
  • required dynamic range: 65!
      • If MIP in cell channel 16
      • >>> 4.5 GeV: channel 3000,
      • 12 bit ADC, ch 4096 = 3 V and
      • >>>> ch 16 =12 mV
  • preamp gain required:12 mV/7.2 fC = 1.7 mV/fC
      • 12 mV/1.8 fC = 6.8 mV/fC

Resolution:

10 bit ADC:

-4.5 MeV/bin

12 bit ADC,

-optimal in range:

~ 1 MeV/bin

ECFA-DESY Workshop, NIKHEF

required gain for preamps 2 options
Required gain for preamps, 2 options
  • B) For the Si-PM's:
  • much less preamp gain is needed
  • SiPM intrinsic gain is ~106
  • a VFE RO-board development is under way
  • at MEPhI and PULSAR (both Moscow),
  • based on the H1-PM preamps.
  • They also look in an alternative pre-amp/shaper concept.
  • more on the photodetectors and pre-amps can be found in:
  • http://www.desy.de/~korbel/see/HCAL_Main_60902.ppt and
  • ....../DESY-Zeuthen_4.12.02.pdf.

ECFA-DESY Workshop, NIKHEF

more on preamplifiers for apd s
more on preamplifiers for APD’s
  • CALICE-ECAL:
    • prototype: ~10 mm2 preamp chip, modified OPERA type for APD
    • modifications specified and simulated in chip, design ready
    • next week submission of modified design for prototypes 25 x18 ch.
    • delivery in June 2003. Use in minical Summer 2003
  • Minsk/Protvino:
    • 2 types tested with APD and MIP’s
    • 10 preamps available
    • 100 preamps in February 2003,
    • design of 16 channel MPC prototype:
    • (~ 8000 Euro needed??)
  • Prague (I.Polak):
    • voltage amplifier, (probably not optimal for APD’s??),
    • signals seen in DESY test, signal/noise???
    • agreed to produce 16 channels PT end Febr. 2003
    • development financed by Prague
  • DESY
    • trans-impedance type, tested with APD’s,
    • mod. CMS-type, cheap !, P. Smirnov
  • Test of all oreamps from above in minical tests when available in time.
  • Decision on what to use in preprototype: October 2003

ECFA-DESY Workshop, NIKHEF

electrical signals from the minical
Electrical signals from the minical

CAMAC Read-Out, LC-2249A

MA-PM as photodetector now

up to 144 channels needed in summer

81 Si-PMs

27 APDs

3 MA-PMs (up to 48 channels)

  • Noise, randoms
  • cosmics
  • LED-pulses

ECFA-DESY Workshop, NIKHEF

more on photodetectors
More on photodetectors

Detailed investigation of available photodetectors

with 55 cm2 scintillator tiles in test beams

MIP peaks clearly separated from pedestals.

  • satisfactory performance
  • none yet tested in high field
  • all will be used in minical to establish performance and get operation experience
  • than decision which to use!!

PM pre-amp,

DESY-H1

pre-amp from MEPhI

Hamamatsu,multianode PM,44mm2pixel

MEPHI, Si-PM, 11 mm2 pixel

Q sensitive pre-amp,

Minsk

V sensitive pre-amp,

Prague

Hamamatsu,APD, 55 mm2

Hamamatsu,APD-array,11 mm2 pixel

ECFA-DESY Workshop, NIKHEF

the vfe rob scheme
The VFE-ROB-scheme

Online

Gain/HV

monitoring?

PIN diode for LED

monitoring

LED signals

beam

cosmic

HV for

Photo

detectors

Trigger/

RO

clock

pedestals

Array of

Photo

detectors

sensitive

preamps

pulse

shapers

Sample &

hold

Multi

plexer

(analog)

ECFA-DESY Workshop, NIKHEF

the read out boards vfe rob s for prototype
The Read-Out Boards (VFE-ROB’s) for prototype

It is foreseen to place the photodetectors

on the surface of a ROB (read-out board),

as tight together as possible,

on special sockets to be developed,

about 108 (6 x 18) pieces on one board.

For the Si-PMs probably 3-4 times more

have to be placed on a ROB.

About 10-12 ROB's are needed for the

Tile_HCAL prototype end 2003.

(1000-5000??? channels)

The signals from the pre-amps, which have

to deliver signals of 8mV/fC input charge,

have to be shaped (shaping time ~ 80-100 ns)

and stored in sample and hold (S&H) pipelines

for a time period of about 1-2 msec.

Than a multiplexed read-out, clocked by the DAQ,

will empty the pipelines.

ECFA-DESY Workshop, NIKHEF

calibration on vfe rob s
Calibration on VFE-ROB’s
  • Cosmic muon calibration:
  • the FE boards should be permanently operational to allow,
  • between test-beam pulses,
  • continuos collection of the low rate cosmic muons
  • penetrating the calorimeter,
  • which are used for real time on-line calibration.
  • They generate their own calibration triggers.
  • Low rate process, for precise calibration of whole chain
  • Preamp calibration:
  • by charge injection, >>
    • dynamic range
    • linearity,
  • high rate process, tests electronic chain only

ECFA-DESY Workshop, NIKHEF

studies with calice ecal chip
Studies with CALICE-ECAL chip

Cinjection

Chip VFE

Diode

Icalib

R

L

Electronic calibration

Polarisation (-200V)

Le premier PCB du prototype physique

6 circuits de calibrage

opérant sur 18 diodes chacun

Déclenchement

Calibrage

ECFA-DESY Workshop, NIKHEF

photodetector monitoring on vfe rob s
Photodetector monitoring on VFE-ROB’s
  • LED monitoring:
  • The ROB should also integrate
  • a few light emitting diodes (LED's)
  • with LED-light distribution by clear optical fibres.
  • to all individual photodetectors
  • for stability monitoring,
  • and also to a few stable Si-photodiodes
  • (stable against temperature and bias voltage fluctuations)
  • to monitor the LED light output.
  • The analogue signals of the LED monitoring photodiodes
  • and the Si-PD’s (some?)
  • have also to be amplified, shaped
  • and stored in the same S&H pipeline.
  • LED monitoring has to be triggered in the gaps
  • between the test-beam pulses and during the read-out!

ECFA-DESY Workshop, NIKHEF

more on vfe rob duties
More on VFE-ROB duties
  • The ROB has to integrate
  • the active elements (chips, to be developed) and in tight package
  • all the signal lines up to the S&H and multiplexer,
  • the power lines for the
    • individual photodetectors
  • (~400V for the APD's, or ~30V for the Si-PM's),
  • where each photodetectors operation voltage
  • will be adjusted individually
  • for equal gain on the level of ~0.1V.
  • It is hoped, that we can profit considerably from
  • the design of the ROB prototypes of the
  • CALICE-ECAL at LAL/Orsay.

Group strongly interested in taking over VFE and DAQ duties:

DUBNA: (I. Golutvin, I. Tyapkin)

ECFA-DESY Workshop, NIKHEF

channel architecture chip ecal hcal
channel architecture, chip ECAL >> HCAL

Detector

Amp

DC block

On chip

Charge preamp

shaper

Track & hold

Vdc = -200V

OPA

LAL-Oray, F. Richard,dela Taille,

offered to us to modify the ECAL-preamp/shaper chip

for the requirements of the Tile-HCAL APD’s >>>>>

ECFA-DESY Workshop, NIKHEF

pre amp layout
pre-amp layout

FLC_HCAL chip

Rst_R

Vbiaso_pa

Vbiasm_pa

Vbiasi_pa

Vb_casc

Vbiaso_sh

Vbias_cell

V_rf

In 0

Vdda

Vbiasi_sh

Ck_R

R

Vss

Vf

H

64

63

62

61

60

59

58

57

56

55

54

53

52

51

50

49

1

In 1

48

Out 0

In 2

2

Out 1

47

FLC_HCAL

CQFP 64 package

In 3

Out 2

3

46

Out 3

4

45

In 4

Out 4

5

44

In 5

43

Out 5

In 6

6

7

42

Out 6

In 7

Out 7

8

41

In 8

9

Out 8

40

Vss

Out 9

10

39

In 9

11

Out 10

In 10

38

Out 11

In 11

12

37

Out 12

13

36

In 12

Out 13

35

14

In 13

Out 14

34

In 14

15

Out 15

33

In 15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

In 16

Vss

Vdd

In 17

SW1

Vdd

Out17

Out 16

SW2

Out

Out_pa

Bias_out

Vss

Vdd

Q_R

Bias_buf

FLC_HCAL pinout

25/03/03, LAL

Package : CQFP64

2,5mm

1,7mm

64 pins

Charge inputs

Voltage outputs

MUX output

ECFA-DESY Workshop, NIKHEF

lal orsay studies for tile hcal pre amps simulation studies for linearity
LAL/Orsay studies for Tile-HCAL pre-ampssimulation studies for linearity

Linearity shaper/buffer

Linearity preamp

ECFA-DESY Workshop, NIKHEF

lal orsay studies for tile hcal pre amps output signal shapes
LAL/Orsay studies for Tile-HCAL pre-ampsoutput signal shapes

Output signal preamp

Output signal shaper

ECFA-DESY Workshop, NIKHEF

flc hcal characteristics next steps
FLC_HCAL characteristics, next steps

25/03/03, LAL

18 charge inputs/18 voltage outputs/1 MUX output

Gain= 6.7mV/fc  450 fC max input charge (70 MIP)

2.8V dynamic range below 1% non-linearity

  • DESY will order 25 of such prototype chips
  • at the 7.April 2003
  • >>> 25 x 18 =450 preamp channels delivered in mid June 2003
  • DESY gets test-board from LAL
  • line driver prepared to run 30 channels for APD-minical studies
  • (July-September 2003)
  • If prototype chips are ok, we have enough channels to equip the
  • APD-cells (100-300, to be decided in May) of the prototype
  • calorimeter!

ECFA-DESY Workshop, NIKHEF

draft of conclusions from the dubna meeting
Draft of conclusions from the DUBNA meeting
  • We need:
  • ~ 1000 RO-channels at beginning of 2004 for the 1m3 prototype test
  • --APD’s (Hamamatsu) and Si-PM’s (MEPhI) will be used
  • --photodetectors and preamps have to be optimised soon!
  • --The size of APD’s will be ~3x3 mm2
  • the gain required was specified,
  • the combined gain of APD and preamp should result in 2-8 fC/MIP,
  • the electronic noise should be below 4-5 sigma of MIP,
  • the capacity of the APD’s will be ~ 25 pF,
  • the stability of the MIP signal should be in the range of 1%,
  • shaping time has to fit to the minimum bunch distance (180 ns),
  • dynamic range required between MIP(4 bit) and max. signal is >/~65

ECFA-DESY Workshop, NIKHEF

draft of conclusions from the dubna meeting1
Draft of conclusions from the DUBNA meeting
  • Due to the short time available
  • we probably have to proceed in 2 stages:
  • 1. Use CALICE-ECAL VFE board with minimal modifications
  • keep 108 channels/board
  • keep ECAL preamps, noise,shaping,...
  • modify implementation/arrangement of photodetectors on board
  • modify photodetector power supply
  • add LED monitoring for all channels
  • .....
  • 2. Design a versatile VFE concept allowing use of different competing
  • elements (preamps, HV distribution, monitoring..)
  • 3. When useful VFE boards available for first 1000 channel tests:
  • and more experience gained, (probably 0.5-1 year later)
  • implement optimal preamps (capacity, noise, gain), shaping
  • optimise power supply and individual adjustment
  • optimise online LED stabilisation

ECFA-DESY Workshop, NIKHEF

the vfe rob scheme apds
The VFE-ROB-scheme, APDs

Online/Offline

Gain/HV

monitoring?

PIN diode for LED

monitoring

LED signals

beam

cosmic

HV,

380-420V

dV/V~10-4

DAC

Trigger/

RO

clock

Charge injection

pedestals

Array of

single APDs

or matrices

charge sensitive

preamps

pulse

shapers

Sample &

hold

Multi

plexer

(analog)

ECFA-DESY Workshop, NIKHEF