1. NPS mechanical design 01/31/2019 Jlab meeting
Unité mixte de recherche CNRS-IN2P3
Université Paris-Sud Orsay cedex
Tél. :
Fax :

2. General front Axio view
Calorimeter
36 raws of 30 crystals =1080 crystals 20,5 x 20,5 x 200 mm

3. General back axo view
30 Interface PCB and cables

4. Crystal + PMt + cabling for 1 channel
Reference plate
Fiber Cut view
PMt support plate
Carbon plates honeycomb structure
Interface Pcb (HV,Anode and LED)
PMt assembly

5. Calorimeter 36 raws of 30 crystals =1080 crystals 20,5 x 20,5 x 200 mm
Each crystal is wrapped of 1 reflective sheet on each side except the back side toward the PMt (Reflecteurs, Enhanced Specular Reflector 3M S+ESR 65µ thickness)
(Tests have been made to check light crosstalk between 2 crystals:
No crosstalk so no layer tedlar added )
Pitch between 2 crystals = 21,35 mm at the moment in each direction (gap between 2 crystals = 0,85mm
Have to be optimised in order to facilitate the introduction of all the crystals in the composite honeycomb .
Cooling copper plates around the calorimeter + insulation with Foam in order to maintain the 18°=/- 0,1 °(Study in progress)

6. Calorimeter Honeycomb support
Spacers and threaded rods between the 2 frames
Back side alveoles (20 mm width)
Aluminum frame (20 mm width)
Front side alveoles (20 mm width)

7. Calorimeter support: Back side alveoles details
Reference Aluminum plate on which is glued the backward honeycombed structure
Carbon plates 0,5 mm thickness crossed
Carbon plates glued on the reference plate

8. Calorimeter support: Front side alveoles details
Blocking plastic parts for an axial maintain of the crystals
Insert plastic part inside each alveole
(after insertion of the crystal)

9. Independent PMt assembly (new design)
Shielding Mumetal tube
PMt
Shielding tube glued in the Aluminum part
Aluminum support part
2 push washers
2 Threaded rods
Socket of the PMt
2 Spacer Tubes
2 springs in order to press the PMt to the crystal

10. PMt assembly dismounting
Captive screw
Unscrewing of 1 alone screw
Silicate fiber
Removing the PMt assembly without the fiber

11. Cables , PCB cards and connectors
Toward Lemo connectors
Signal :Sma connector
Signal :Sma connector
signal cables strands
Translation system
HV :Fisher connector
LED + silicate optic fiber for monitoring and curing
LED command connector ( samtec)

12. Backward access for PMt dismounting

13. HV cables 180mm 325mm stretched cable (350 mm necessary) 270mm
In reality the Lemo connectors don’t move !
180mm
325mm stretched cable
(350 mm necessary)
270mm
1080HV cables
375 m

14. HV divider-PCB card link
1080 cables HV
345 m
1080 anode cables
345 m
The final length of all the cables will be adjusted with the help of a moke up in order to validate the good translation of the interface Pcb without stress on the connectors
180mm
220mm
285mm stretched cable
(320 mm necessary)

15. Thermical aspect (cut view of the calorimeter)
Intermediate Zone : Thermical Resistance
Crystals Zone 18°+/-0,1°
Heating Zone : 500mW/channel = 540 W
Intermediate Zone : Made of Glass , Vacuum (PMt)
Depron (Thermal insulator)
+ cold Copper plate
External Zone : T° = 22°c

16. Thermical aspect
Crystals Zone 18°+/-0,1°
Heating electronic Zone : 500mW/channel = 540 W
Heating zone cooled with 2 heat exchangers 6320G3SB (Lytron)
+ funs + 1 chiller Kodiac RC006G03BG3

17. Thermical aspect: Crystal zone
Crystals Zone 18°+/-0,1°
4 copper plates around + 1 intermediate copper plate + 1 other chiller ( cooling separated from backward zone)
Foam : thermal insulator