R3B CALIFA design - Universidade de Santiago de Compostela

R3B CALIFA design 

H. Alvarez Pol, J. Benlliure, E. Casarejos, D. Cortina, 

I. Durán, M. Gascón 

GENP, Dpto. Física de Partículas, Universidade de 

Santiago de Compostela 

J.A. Vilán Vilán, P. Yañez 

CIMA, Escuela Técnica Superior de Ingenieros 

Industriales, Universidade de Vigo 

H. Alvarez Pol – R3B CALIFA design R3B Cal WG - GSI, 29 April 2009

Index 

A. Calorimeter design 

1. Reminder of physical design principles 

2. Description of last version (v 6.1) 

3. CALIFA demonstrator 

4. Outlook 


Reminder: physical design principles 

Constrains in the calorimeter design: 

• High energy gammas: energies boosted up to three times the 

“projectile frame” energies (at 700 A MeV) 

✔ Large crystals for a high total absorption efficiency 

✔ High granularity for correcting the Lorenz boost 

✔ Most energetic gammas in the forward direction 

✔ Critical region around 35 o (0.5 rad); better polar angle resolution 

required in a region with large statistics! 

• Protons: energies up to 300 MeV 

✔ Large crystals for stopping up to 300 MeV (around 200 mm) 

✔ Energy distribution depends on experimental case: specific 

simulations required! 

Details on technical note: 

R3B_CAL_01/05, H. Alvarez Pol 

Available at: 

http://www.usc.es/genp/r3b/ 


CALIFA DESIGN (2005/09) 

v6.1 (2009, UVigo-USC) 

- Joint development: 

GENP@USC /CIMA@UVigo 

- Based on mechanical structures 

(alveolus or baskets) not on crystals. 

- Developing simultaneously mechanics. 

- Prototyping on carbon fibre baskets. 

CIMA group @ University of Vigo: 

- Jose Antonio Vilán Vilán 

- Pablo Yañez 

GENP group @ USC: 

- Ignacio Durán 

- Hector Alvarez Pol 

v2.1 (end 05, USC) v3.0 (06, USC) v4.0 (06/07, IPNO-USC) v5.0 (2008, USC) v6.0 (08/09, UVigo-USC) 


CALIFA design v6.1 features 

Main features in design v6.1: 

• BARREL region: 

✔ Alveoli with four symmetrical crystals. Total of 24x38=912 alveoli, 

with 6 different alveolar geometries. 

✔ Total number of 3648 crystals in Barrel. Only 7 different crystal types. 

✔ Inner half of the crystal shape defined by the alveoli (and Physics). 

Short-side of the entrance face always above 10mm. 

✔ Covers polar angles between ~35º and ~135º. 

• FORWARD ENDCAP region: 

✔ Alveoli filled with three different crystals. There are 4 different alveolar 

geometries with a total of 317 alveoli. 

✔ Total number of 951 crystals in Endcap. Only 12 different types. 

✔ Covers polar angles between ~9º and ~35º. 

✔ Crystals shape tentatively defined. Alveoli could be adapted to different 

solutions? Design could contain phoswich (or other) solutions? 


Granularity analysis 

CALIFA v6.1: granularity points to a geometry contribution to 

the energy resolution below 4% 


CALIFA v6.1 mechanical design: alveoli, covers, ... 

Ongoing work on mechanics: 

✔ Precise design of alveoli covers, refrigeraction, 

✔ First results available in TSR (2008), TDR in preparation 


CALIFA v6.1 mechanical design – Support structures 

● Space for support mechanics 

● Infrastructure for crane 

● Integration with other detectors 

Need for an integration meeting! 


CALIFA demonstrator 

First construction step: CALIFA demonstrator 

• Demonstrator concept (our proposal): 

✔ A part of the calorimeter final design, fully reusable in CALIFA. 

✔ Large enough for Physics experiments. 

✔ Capability for design evaluation and Physics test (2011-13). 

✔ Flexible for different angular configurations (example in next slide). 

• Main features: 

✔ Lower polar angle alveoli from the BARREL section. 

✔ 20% of CALIFA: ~800 crystals (?). 

✔ Covers polar angles between ~35º and ~70º (when not tilted). 

✔ Maybe segmented in azimuthal angle for reducing “deformations”. 

• Problems (up to now...): 

✔ Still difficult to make compatible with “CALIFA mechanics”. 

✔ Requires clear statements before the end of the year 


CALIFA demonstrator concept 

Disclaimer: figures are not based in last CALIFA v6.1 


CALIFA demonstrator configurations 

Different angular configurations: 

• Optimal efficiency/covering for different energies. 

• Some “deformation” if it is not in the CALIFA position. 

Disclaimer: figures are not based in last CALIFA v6.1 

500 A MeV 700 A MeV 


CALIFA demonstrator 

• Demonstrator agenda? 

✔ Design when TRD ...? 

✔ Construction 2010/11 ...? 

✔ Evaluation and Physic cases for 2011/13 ...? 

• Demonstrator financement? 

✔ Money from Vigo/Santiago for mechanics ...?? 

✔ Crystals ...? 

✔ Electronics ...? 


Outlook and ongoing work 

Outlook: 

• Collaboration with CIMA (Mechanics Engineering) group at the University of Vigo 

● Calorimeter physical design 

Ongoing work... 

Mechanics : 

• Mechanical design (CIMA, Uvi) 

• Demonstrator concept (GENP+CIMA) 

• New version evaluation: simulation (GENP) 


ADITTIONAL SLIDES 


Manpower 

CALORIMETER DESIGN AND SIMULATION 

GENP [USC]: 

• Ignacio Durán Escribano, Full Professor (10%) 

• Héctor Alvarez Pol, IPP Researcher (50%) 

• Paloma Díaz Fernandez, PhD Student (50%) 

TOTAL: 1.1 FTE 

CIMA [UVi]: 

J.A. Vilán, Marcos López, 

Ángel F. Vilán, Pablo Yáñez 

TOTAL: 1 FTE 


CALIFA design v1.2 (summer 2005), v2.0 (2006), v3.0, .... 

First design iteration (CALIFA 1.2): 

• 6570 crystals in 73 different crystal types 

• Covering polar angles between 7º and 133º 

• Trapezium-like shaped crystals 

• Simple geometry filling the gaps 

• Typical crystal volume: 10x20x(130-200) mm 3 

• Weight: ~ 1600 Kg; volume: ~ 360 dm 3 

Technical note: R3B_CAL_01/05, H. Alvarez Pol 

Available at: http://www.usc.es/genp/r3b/ 

CALIFA 2.0: 

• 4500 crystals 

• 10 different types 

• No azimuthal gaps 

• Unsolved problems on forward region 


3.0° 2.0° 1.7° 1.5° 1.2° 

130° 

Polar 

angles 

Beam 

CALIFA design v4.0a, b, c (IPN Orsay, USC, end 2006) 

• Collaboration from IPN Orsay and USC 

• Less (wider) crystals, better gamma efficiency (no holes) 

• Nice solution for BARREL, not so good for EndCap: many 

different crystals types, still not optimized 

• Radius too large (minimum ~ 45 cm) 

90° 

38.8° 

H. Alvarez Pol – R3B CALIFA design R3B Cal WG - GSI, 29 April 2009 

29.2° 

17.2° 

5.2° 

1.2° 

1.5° 

1.5° 

J. Peyre, IPN Orsay 

H. Alvarez Pol, USC

CALIFA v5.0 - Barrel crystals and modifications 

Crystal features (v5.0): 

✔ Only five different crystal types in Barrel 

✔ Variable length with polar angle, according to the 

Lorentz boost results 

✔ Terminated to ~20x10 mm to connect with 

Hamamatsu APD S8664-2010 (*) 

✔ A “triedrum” corner facilitates mechanical 

production and measurements of the crystal 

✔ Inner calorimeter radius 300 mm (minimum) 

✔ Technical drawings available for production 

H. Alvarez Pol, USC 


Type 1 

128 o 

CALIFA v5.0 - Barrel 

Type 2 

106 o 90 o 

73 o 

H. Alvarez Pol – R3B CALIFA design R3B Cal WG - GSI, 29 April 2009 

59 o 

Type 3 

46 o 

Type 4 

36 o 

Type 5

ProtoZero proposal 

Prototype proposal based on CALIFA v5.0: 

✔ 15 crystals of Type2 


CALIFA v4.0b 

Reminder: design principles

R3B CALIFA design - Universidade de Santiago de Compostela

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