1. Projekt FAIR-CZ-OP In-kind dodávky pro detektor ECAL (HADES)
P. Tlustý, A. Kugler, O. Svoboda, J. Stanislav, A. Stejskal (ÚJF Řež)
Výstavba elektromagnetického kalorimetru (ECAL) pro detektor HADES
Motivace, popis detektoru a českých investic
Aktivity v roce 2016, současný stav projektu
(podpora z projektu FAIR-CZ MŠMT LM )
- výroba modulů, příprava na masovou produkci
- vývoj monitorovacího systému
- příprava na instalaci HV systému
- vývoj a výroba magnetického stínění pro fotonásobiče
FAIR-CZ kick-off meeting, Praha, vila Lanna, 14. prosince 2016

2. Motivation to build ECAL
HADES
START
- measurements of the respective p0 and η meson
two g decay yields together with the dielectron data
for the knowledge of dielectron coctail and
normalization at incident heavy ion energies 2-8 AGeV
- g measurements from specific strangeness
production channels:
L(1405) decay, K0 → π0 + π0 reconstruction
- better electron/pion suppression for large momenta
(p>400 MeV/c) as compared to the present situation
EMC
CERN CERES-TAPS Eur. Phys. J. C 4, (1998), Eur. Phys. J. C 4, (1998)

3. ECAL for HADES – Status 2016 FAIR-CZ in-kind contribution:
Purpose and Concept
Based on lead-glass modules combined with Hamamatsu 3" PMTs
Significant improvement in electron-to-pion suppression
Enables photon measurements
Will be installed in HADES cave at SIS18
STATUS
TDR approved
Participating institutes: TU Darmstadt, U Krakow, INR/RAS Moscow, INP/CAS Rez, TU Munich, IP Bratislava, MEPhi Moscow and GSI
Preparation of the mechanical infrastructure in progress – Polish in-kind contract signed
Commissioning planned for Q1-Q2/2018
Expected performance: ΔE/E = 5 % at 1.0 GeV (photons)
Total cost: M€ – (0.847 M€ available, M€ EoI, M€ to be assigned)
FAIR-CZ in-kind contribution:
HV power supply for 4 sectors (crate, HV cards, cables, Radiall connectors)
200 pieces of HV dividers for ECAL
Optical monitoring system for 5 sectors
120 pieces of 3“ Hamamatsu PMTs
material for magnetic shielding etc.
In total 11M CZK, i.e. 415 k€
Pavel 15
2016
2017 18
Mainframe
Module assembly
Sector assembly
DAQ
Installation

4. Modules assembly - Status Dec. 2016
modules with 3” PMT’s
- 117 pieces of 3“ modules assembled
- 85 tested with cosmic muons and LED light – A. Reshetin, A. Shabanov, O. Svoboda
- new PMTs ordered, to be continued in 2017
modules with 1.5” PMT
- 150 modules assembled, mag. shielding and opt. fibres will be added in Mar./2017
 2 sectors (2 x 163 modules) to be finished soon, will continue with new PMT delivery
Nov. 2016,new GSI detector lab.

5. Optical monitoring system
One sector full system developed and tested:
manufactured SQS Nová Paka (CZ)
450nm laser (IIIB), 80mW
microlens array and optics
196 fibers for blue light
light yield in fibres same within 22%
HV supply
384 channels per crate
output voltage range is 0 ÷ 3.5 kV, with 3 mA
price 230 EUR/channel + 25 EUR/channel
for HV connectors and cables
production of cables, slow control system, …
Crate SY 1527LC
Mod. A1535

6. Measurement of magnetic shielding
magnetic shielding made from two layers of 0.1 mm Mu metal foil from Aaronia.de
micro welded
diameter 8cm, length 15.5 cm
Painted with black color (outer and inner surface) to absorb light
used for 3“ PMT from Hamamatsu (R6091) – covers whole PMT
will be operated in magnetic field of 3 – 5 Gauss max
homogenous magnetic field from dipole magnet SP-46
magnetic field oriented upright to longitudinal axis of PMT
field strength changed by precise power supply (∼1V / 250 mA)
magnetic field measured with DTM-151 Digital Teslameter
shielding mounted in ECAL module (lead glass 420x92x92mm, readout by R6091 PMT operated at V)
short light pulses send via optical fiber to the glass – output
amplitude from PMT set to -3V at 0 Gauss
measurement done at two PMT orientations with respect to the magnetic field
without shielding fast decrease in output amplitude (for more than 1 Gauss)
with shielding slow decrease in amplitude starting from ∼5 Gauss
PMT more sensitive to the magnetic field when dynodes oriented parallel to the field lines (upright to electron path)
for smaller diameter and length of the shielding (1.5“ PMT – 4x10.5cm) one layer is enough to get the same performance
P. Tlustý, O. Svoboda, T. Matlocha Nuclear Physics Institute of the Czech Academy of Sciences, public research institution

7. BACKUP SLIDES

9. Simulations σ = 37 MeV/c2 σ = 32 MeV/c2 C+C 8 A GeV Ni+Ni 8 A GeV
M = 555 MeV/c2
σ = 37 MeV/c2
M = 572 MeV/c2
σ = 32 MeV/c2
S/B ~ 3%
S/B ~ 1% 9

10. FAIR-CZ-OP grant
Facility for Antiproton and Ion Research - participation of the Czech Republic – OP
- EU grant to cover part of needed ECAL investments
- Allocated budget for investments 415 k€
- Will be used to buy:
- HV power supply for 4 sectors (crate, HV cards, cables, Radial connectors)
- 200 pieces of HV dividers for ECAL
- optical monitoring system for 5 sectors
- about 120 pieces of 3“ Hamamatsu PMTs
- material for magnetic shielding, production of 3“ mechanics,
HV connection boxes, …
Submitted within closed call, already passed formal check and is currently being evaluated by experts.

11. Motivation Eur. Phys. J. C 4, 231-247 (1998)