ENDCAP WEIGHTS AND MATERIALS
----------------------------
Updated by Dave Cockerill
19.5.99
EE Crystals
30x30 mm**2 at rear, 28.62x28.62 mm**2 at front
220 mm long, volume 189 cm**3
Density 8.28 g/cc, weight 1.565 kg
Each Endcap has 8000 crystals
crystal volume 1.512 m3
crystal density 8.28 g/cc
crystal mass per endcap 12.52 tons
crystal mass per Dee 6.25 tons
Weight Item
--------- ------------------------------------------
12,500 Kg Crystals alone
0,350 Kg Aluminium inserts etc in supercrystals
1,200 Kg Back support plate (5 cm aluminium, from an
inner radius of 375 mm to an outer radius of
1700 mm, sited 220 mm from the HCAL)
approx 0,500 Kg Moderators between back support plate and HCAL
from configuration 6, fig 5, CMS TN
96-057, see apendix 1.
+ weight of FPU/ADC Electronics and its cooling,
which is currently unknown for weight and
density. This will be sited on the 'HCAL side'
of the ECAL back support plate.
+ weight of aluminium seating elements
+ environmental shield
+ outer annulus support
---------
Xtal Endcap total 14,550 Kg plus +, NO preshower
---------
Dee Total 7,275 Kg plus + and lifting frames etc, NO preshower
Completed Xtal + Preshower endcap
---------------------------------
14,650 Kg Xtal Endcap
1,852 Kg Preshower (latest info from P Wertelaers, see
appendix 2)
---------
Endcap total 16,502 Kg plus +
---------
Appendix 1 Moderator behind endcap xtals
*******************************************
From Huhtinens 'configuration 6'
** and new calculations for the cylindrical moderator (march 1999)
a cylindrical moderator behind the 'plug'
length 220 mm (from HCAL to Endcap support plate)
inner radius 32 cm (eta=3)
** outer radius 39 cm (eta ~ 2.8)
a vertical moderator
thickness 8 cm , sitting behind the endcap support plate
inner radius 50 cm
outer radius 100 cm
then thinning down to
thickness 4 cm
inner radius 100 cm
outer radius 130 cm
Appendix 2 Preshower details
******************************
CMS ENDCAP ECAL PRESHOWER : WEIGHT INVENTORY , very approximative
per endcap ( surface app. 467 dm^2 )
moderators (2) : 0.8 dm * 467 dm^2 *1 kg/dm^3 = 374 kg
Al for absorbers (2) : 0.12 467 2.7 151 kg
Pb for absorbers (2) : 0.166 467 11.3 876 kg
tiles-micromodules(2) : 0.08 467 2.7 101 kg
electronics planes(2) : 100 kg
overhead ( vessel,cables,feedthroughs,support,water,..) 250 kg
--------
1852 kg
*** Note 1 dm = 0.1 metres = 10 cm ****
*** The endcap preshower is app. 4.67 m^2 ***
Wertelaers , 11.07.97