TELL1 high rate tests@ Birmingham

Karim Massri University of Birmingham

karim.massri@cern.ch

CEDAR WG Meeting – CERN – 26/03/2012

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 2

Introduction Experimental setup

Special requirements for the random rate (RaR) tests RaR tests: components & TELL1 input Adjusting the setup to get regular rate (ReR) signals

Results ReR & RaR results with TDCB clock @ 40 MHz ReR & RaR results with TDCB clock @ 80 MHz

Conclusions

Outline

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 3

High rate tests motivation:

Current estimated rate on each PMT of the CEDAR ~ 5 MHz

Electronics inefficiency study needed to choose the most suitable number of PMTs

Particular remarks: TDCB v5 has been used (previously v2) Single channel study TDCB clock initially @ 40 MHz, then → 80 MHz

Introduction

Increasing the clock frequency means increasing the speed of the data reading from the TDCB buffer!

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 4

Experimental setup

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 5

Special requirements for RaR tests

on the source: Source of Poissonian-distributed pulses Source must work at high rates (~MHz) Frequency must be adjustable

on the data acquisition: The number of input pulses must be known All the pulses must be sent while TELL1 is acquiring

Experimental setup

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 6

RaR tests: components

Scaler: ORTEC 9744 channels

100% efficient up to 92 MHz

LEDPMT

Light filter

Coincidence

Black Box

TRIGGER

TELL1

preAmp +

NINO

NIM to TTLconverter

CAEN 16chLow Threshold discriminator

2ch pulse generator

Attenuator (31 db)

Experimental setup

Same setup of December

tests (with TDCB v2)

TDC board (v5)

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 7

RaR tests: TELL1 input

Attenuator (31 db)

2ch pulse generator

To the LED: DC voltagewith adjustable amplitude

→ variable frequency!(from 0 up to 50 MHz!)

To the NIM modules:5µs long NIM pulse @100Hz

LEDPMT

Light filter

Coincidence

CAEN 16chLow Threshold discriminator

NIM to TTLconverter

Black Box

TRIGGER

TELL1

preAmp +

NINO

TELL1 time window = 20 µs

Current firmware can handle no more than 256 words per trigger!

Experimental setup

TDC board (v5)

Same setup of December

tests (with TDCB v2)

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 8

Some more details about the input...

NINO input (after the preAmp):Amplitude ~ 120 mV

Width ~ 8 nsNB: the signal is extremely regular!

(attenuated NIM signal)

Experimental setup

RaR tests: TELL1 input

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 9

ReR tests: adjusting the RaR setup..

Scaler: ORTEC 9744 channels

100% efficient up to 92 MHz

LEDPMT

Light filter

Coincidence

Black Box

TRIGGER

TELL1

preAmp +

NINO

NIM to TTLconverter

CAEN 16chLow Threshold discriminator

2ch pulse generator

Attenuator (31 db)

Experimental setup

LED can't be used to generate ReRbecause it doesn't

respond with a regularlight pulse!

TDC board (v5)

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 10

2ch pulse generator

To the Low Th Discriminator:Amplitude: 25 mV

Width ~5 nsvariable frequency (0200 MHz)

To the NIM modules:5µs long NIM pulse @100Hz

Attenuator (31 db)

LEDPMT

Light filter

Coincidence

CAEN 16chLow Threshold discriminator

NIM to TTLconverter

Black Box

TRIGGER

TELL1

preAmp +

NINO

TELL1 time window = 20 µs

Current firmware can handle no more than 256 words per trigger!

ReR tests: TELL1 inputExperimental setup

TDC board (v5)

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 11

Upgrading @ 80 MHz..Experimental setup

Current TELL1 firmware version: v132 (from Pisa) Current TDCB firmware version: v5 (from Pisa)

TELL1 firmware @ 80 MHz: v136 (from S.Venditti) TDCB firmware @ 80 MHz: v6 (from S.Venditti)

TDCB firmware upgrade via JAM (thanks to B.Angelucci!)

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 12

Data taking procedure

Set the frequency (RaR: adjusting the LED voltage) Enable the scaler, start TELL1 acquisition Turn on the trigger pulse from the generator Wait until a certain number of counts has been reached Turn off the trigger pulse Stop scaler, end TELL1 acquisition

17 + 24 (RaR + ReR) runs / clock frequency (40MHz or 80MHz)each one for a different frequency (~1MHz to ~15 MHz)

~20000 pulses have been sent to the TELL1 during each run

Experimental setup

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 13

Results

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 14

ReR tests @ 40MHz: inefficiency

Trailing lossesdue to extra leadings

TDCB v2 (December tests) VS

TDCB v5

TELL1 high rate tests

No more event losses @ ~ 5 MHz

Up to 11 MHzNO leading losses!

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 15

RaR tests: TELL1 output

NO leading losses up to 11 MHz→Fit with exponential for t>100ns → Mean frequency measured from slope

Leading-to-leading Δt distribution measured by the TELL1

TELL1 high rate tests

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 16

TELL1 high rate tests

RaR tests @ 40MHz: inefficiencyTDCB v2 (December tests)

VSTDCB v5

v5 looks slightly better!

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 17

ReR tests @ 80MHz: inefficiency

~ same inefficiencyat double rate!

TDCB v5 @ 40 MHzVS

TDCB v5 @ 80 MHz

TELL1 high rate tests

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 18

TELL1 high rate tests

RaR tests @ 80MHz: inefficiencyTDCB v5 @ 40 MHz

VSTDCB v5 @ 80 MHz

~ same inefficiencyat double rate!

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 19

`

TELL1 high rate tests

RaR tests @ 80MHz: inefficiencyTDCB v5 @ 40 MHz

VSTDCB v5 @ 80 MHz

4% @ 5MHz(instead of ~16%)

Karim Massri – CEDAR WG Meeting – CERN

26/03/2012 20

Conclusions

TDCB v5 has been set and is now working @ Bham

(thanks to B.Angelucci!) TDCB v2 <-> TDCB v5

TDCB v5 results slightly better (@ 40 MHz)

TDCB v5 @ 80 MHz (thanks to S.Venditti!)

wrt results @ 40 MHz ~ same inefficiency at double rate (as expected) for both ReR and RaR

TDCB clock @ 80 MHz looks really promising!