Status of Detector Prototype(for Hawaii meeting at Big Island)

August 24, 2002

Yee Bob HsiungFor

Koji Ueno, Yuri Velikzhanin Yanan Guo and Eddie Huang

First Simple Prototype

Optical – commercial Fresnel Lens (NTK-F300, f30cm, size=30cm, pitch=0.5mm, PMMA UV), UV filter (BG3)

MAPMT – Hamamatsu 4x4 (H6568) or 8x8 (H7546)

Readout electronics – Preamp, Receiver, Trigger, ADC and DAQ

Checking Fresnel Lens

Focal Spot Size at Center

Focal Spot Size 8cm Off Center

Readout Setup

PMT Preamp.

Freshnell lens

UV filter

HamamatsuPMT8x8 or 4x4

1 or 416-channelspreamplifiers

Receiver

2 or 88-channelsreceivers

Trigger

ADC DAQ

64-channelsAcromag

ADC

64-channelsTrigger module

VME

At PC,Visual C++

based

Hamamatsu MAPMT testAnode Uniformity of different channels

NTU

0

10

20

30

40

50

60

70

80

90

100

0 8 16 24 32 40 48 56 64

Series1

Series2

Series3

Series4

Series5

Series6

Series7

Series8

Series9

Series10

Series11

Series12

HAMAMATSU

0

10

20

30

40

50

60

70

80

90

100

0 8 16 24 32 40 48 56 64

Series1

Series2

Series3

Series4

Series5

Series6

Series7

Series8

Series9

Series10

Series11

Series12

Measured at NTU

Data from Hamamatsu

Broken PMT

Hamamatsu MAPMT test

AAnode sensitivity (sum of 64 channels)

Broken PMT

Anode Sens.

1 2 3 4 5 6 7 8 9 10 11 12

from HAMAMATSU

measured at NTU

Preamplifier schematics

+-

FromPMT

+-

FromPMT

Current sensitive version(current -> voltage)

Charge Sensitive version(charge -> voltage)

to save space on receiver

Power supply (16-channels preamplifier):380mA on +/- 5V (3.8W, 240mW/channel)

Waveform ~ exp(-t/T), T~1uS

Preamplifier test with test pulse Q~3*10^6 e (~10 photons)

Signals with different polarity look equally

Preamplifier test with test pulse Q~3*10^6 e (~10 photons)

Response on pulse to LEDTypical minimum voltage needed for LED lighting is 2-2.5 V

Response on pulse to LEDResponse on two photons with ~ 2 us delay

Receiver's Single channel schematics

+-

Shaper

ComparatorLVDS

transmitter

To Trigger

From

preamp.

100 nSDelay line To ADC

(one from these two outputs)Peak &

Hold

Control from Trigger

here are someproblems (another PCBis needed)

We could use these outputs for prototype test

D

B A

C

NIM input

NIM output

DONE

- + - +1

16

- + - +1

16

OUTPUT

Universal VMEMother-boardXCS10-tq144

Mezzanine boardXCS30XL-tq144

GND

EVENT

GND

LVDS-2

LVDS-1- +

TTL-S

A,B,C,D:4 34pin IDE connectors

which accept64 LVDS Inputsfrom receivers

EVENT

To receiversOnly the last receiver terminated

To ext. trigger of IP341s

Front Panel

Trigger module

ClusterHit: signal from an anode exceeds threshold.

Geometric Trigger:

•Count: hit number >= N (preset, 3~7);

•Geom: a cell and any of its 8 adjacent cells are hit.

selfneighbors

Processed byOther ‘self’

Trigger moduleTrigger logic: two hits in adjacent cells + one hit at any place

Trigger Waveform

LVDS input

LVDS output

EVENT_T output

settings:CSR=67Delay=2Width=4Dead-time=20Max #=255Masks=-1

Jitter due 40Mhz operating clock

Data acquisition

ADC SBS PCWindows,

Visual C++

Tested DAQ speed (64-channelsversion) with test pulse to ADC:800 events/sec.

ADCdata

On linetrigger

Buffer RAMHarddisc

HistogramsHarddisc

DAQ schematics

VME

Data acquisition

StartPauseClearSave DataSave Histograms

Toolbar:

Data acquisition (16-channels version)Last event monitor

Hit Sum monitors

Event rate

Last triggered event

Sum triggered events

Triggered event rate

Trigger settings

Full Sum monitors

System status monitor

ADC base adderessNumber of stored events

ADC FIFO monitor

Buffer size monitor

Memory used

Histograms monitor

Data acquisition (64-channels version)

Summary

In the past 3 months, we have tried to develop and put together a complete system for the first simple prototype with commercial Fresnel lens

Bench test for readout electronics are nearly done

Bench test for the first simple prototype will follow

Near Future Hardware Plan

Finish the lab bench test of the simple prototype

Background survey at Mt. Lu-Lin in Taiwan as a field test for the prototype in September or October.

Plan a background survey at Mt. Hualalai.