Lorenzo Cassina

Status of the CUORE Electronics and

the LHCb RICH Upgrade photodetector chain

Lorenzo Cassina - XXIX cycle

MiB - Midterm Graduate School Seminar Day

31/03/2015Midterm Seminar - Lorenzo Cassina

Activity on LHCb• MaPTM qualification

• RICH Upgrade Test beam

• Ongoing tests on the Elementary Cell at MiB

Activity on CUORE• DC/DC converter

• Linear Power supply

• Optical HUB

• Mini-tower at LNGS

Further activities and courses

2

Outline


Baseboard

Elementary Cell

CLARO8 chip (INFN-MiB&Fe)

MaPMT (INFN-Mib)

My activity has been focused on the

characterization of the Multi-anode

Photon Multiplier Tube and the

design of the readout integrated

electronics

Backboard

LHCb RICH Upgrade

3

MaPMT qualification (I)


Several multi-anode PMTs have been characterized in Milano Bicocca this years.

R11265

8x8 pixels

2012-14

R7600

8x8 pixels

Years 2010-12

H9500

16x16 pixels

Years 2009-10

Non negligible

crosstalk and not

suitable to single

photons

OK for single photons

but low active area

The Hamamatsu

R11265 was chosen

as the baseline

according to the

LHCb Upgrade TDR

10/2013 [CERN/LHCC 2013-

022, LHCbTDR 14]

Eight R11265 MaPMTs measured

• Single photon gain and uniformity

• Dark current

• Cross-talk

• Behaviour versus temperature

• Tolerance to magnetic fields and shielding

• Aging over ∼ 3000 hours

• Full equipped EC tested

All the results were collected on a paper and on a CERN

note:

Characterization of the Hamamatsu R11265-103-M64 multi-

anode photomultiplier tube,

L. Cadamuro et al., JINST, vol.9, pp.P06021 (2014).

Characterization of the Hamamatsu R11265-103-M64 multi-

anode photomultiplier tube for the LHCb RICH Upgrade,

C. Matteuzzi et al.,

LHCb-PUB-2014-043, CERN-LHCb-PUB-2014-043.

4


R12700

8x8 larger pixels

2014 - 2015The use of a larger photon detector in the perpheral

areas of the RICH-2 detector allows to significantly

reduce the costs, losing only ∼ 𝟏% of overall PID

performance.

The Hamamatsu H12700 (8x8, 52x52 𝒎𝒎𝟐 pixels)

was fully characterized (3 samples).

This device fulfills the RICH requirements (single photon

sensitivity, large active area, low dark current).

The recently produced Hamamatsu R12699

was also tested (2 samples).

Compared to the H12700, this device is devoid of

the socket provided by the manufacturer, so that

better cross-talk performance can be achived.

MaPMT qualification (II)

The outcomes of the

characterization is going to be

published on CERN Document

Service

(paper currently under final review)

5


RICH Test Beam (I)

Beam line H8 (T4) at SPS North Area

High energy and high resolution beam

• Beam particles: protons and pions

• Energy: 180 GeV

• 106 ÷ 107 particles per spill

Data acquisition and monitoring from the

control room

Test Box

Telescope

(tracking and trigger)

6


Beam

Elementary Cell

RICH Test Beam (II)

7


Results

• Radius estimation from

integrated events: 𝑅 ≃ 60.6 mm

∼ 60.6 mm

RICH Test Beam (III)

8


Results



• Radius resolution: 𝜎𝑅 ≃ 0.47 mm

RICH Test Beam (IV)

9


Results



• Radius resolution: 𝜎𝑅 ≃ 0.47 mm

• Beam centre resolution:𝜎𝑥 ≃ 0.48 mm ∼ 𝜎𝑅𝜎𝑦 ≃ 1.79 mm (due to the MaPMT position)

• Optimization of the trigger

thresholds → Number of recorded

photon per hits to the expectation

RICH Test Beam (V)

The system operated extremely well.

The electronics could not operate with

the lowest threshold values.

→ Submission of a chip version with

new output pad to solve this problem.

10


Ongoing tests on EC at MiB

Blue LED

Only one

pixel

illuminated

Ongoing measurements

- Test on the new CLARO chip → data acquisition at lowest threshold values.

- Cross-talk of the whole system → one pixel illuminated and acquisition of the neighbouring channels

- Threshold scans with the LED → Optimization of the CLAROs threshold.

→ Detection efficiency versus noise rejection

- DAC scan to calibrate the chips and further tests…

11

31/03/2015Midterm Seminar - Lorenzo Cassina12

AD/DC converter:

• 48 V

• Up to 25 A

• Commercially

available

Linear power supply:

• Provides the bias to the

main board and to the

analogic system (dual

programmable output

voltage, ±2.5 𝑉 − ±6.25 V)

DC/DC:

• Provides the bias to the linear

power supply (two

programmable output

voltages, 6.5 𝑉 − 15 V)

• Provides the bias to the digital

system. (one programmable

output voltage, 4.5 𝑉 − 8 V)

CUORE – Power supply chain


Commercial

AC/DC

Backplane board

(two per crate)

DC/DC board

(6 per crate)

Additional board

(one per DC/DC)

Optical

decoupling

Slow

control

Digital block

CAN busPower

line

Several crates have been tested at MiB

The DC/DC additional boards are

completely designed and produced.

Linear power

supply

CUORE – DC/DC


DC/DC

Linear power supply

(LPS)

Slow

control

Local

monitoring

Additional

board

(one per

LPS)

CAN

bus

Power

line

Each linear power supply is locally monitored by an additional board which also

allows the CAN bus communication to the slow control. A new prototype was

designed and produce and the tests of the LPS+additional board system are currently

ongoing.

Filter

CUORE – Linear Power Supply


77 boards were produced and

mounted (full production complete).

I designed the microcontroller

firmware currently under test.

These boards are going to be placed

in three boxes and then mounted in

the CUORE control room.

CUORE – Optical HUB

I developed a CAN-to-Optical fiber

HUB in order to optically decouple the

slow control with the electronic

system (linear power supply, main board,

Bessel filter board).


CUORE – Mini-tower at LNGS

I contributed to set uo a first fully-equipped

CUORE tower at LNGS in November.

The mini-tower includes:

• AC/DC (commercial)

• DC/DC crate controlled via CAN bus

and equipped with protection filters.

• Linear power supply monitored by the

additional board

• Main boards

• Bessel filters

• Pulsers to provide the reference signal.

• The instrumentation were optically

decoupled.

The whole system worked satisfactorilly

and could be fully controlled by the DAQ


Further activity and courses

• I attended the following courses and PhD school so far (without taking the exams):

• Collaboration as tutor for the Labex project.

• Tutor for the LHCb International Master Class in Particle Physics 2015.

• Tutor for the Physics Laboratory 1 course (M. Calvi).

• Co-tutor of a graduand student (A. Limonta). The bachelor thesis aims to develop a digital

board to control the DC/DC converters for the CUORE experiment.

• Contribution to the measurements on scintillating bolometer in the Cryogenic LAB.

• Collaboration with the Prysmian to design a monitoring system operating at high temperature

in a radioactive environment.

• Collaboration with the Tecnologix to design an acquisition system for characterizing solar cells.

- Experimental methods in HEP L. Moroni 40

- Introduction to Bayesian methods E. Milotti 14

- Course on C/C++ D.Menasce Ongoing

- PhD school Rivelatori ed Elettronica per Fisica delle Alte Energie, Astrofisica,

Applicazioni Spaziali e Fisica Medica

Attended

The End

Thank you for your attention!

Lorenzo Cassina

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