NSW envelopes

New Small Wheel

15/02/2013 M. Ciapetti - G. Spigo

2

Hub

Brass pins will be inserted into the hub to improve the spokes bending behavior

3

Hub

Brass pins will be inserted into the hub to improve the spokes bending behavior

4

Main structure

IP

IP

SS SPOKES

FEET SPOKES

LS SPOKES

5

Full assembly

IP

IP

SSLS

SS SPOKES

LS SPOKESFEET

SPOKES

6

LS spokes

LS spokes have been fortified and adapted to the current alignment bars

7

NSW assembly envelope

8

Sectors envelopes radial size

h q[deg]

Envelope thickness

[mm]

LSSIP

NOMINAL

[mm]

LLSIP

NOMINAL

[mm]

LSSHO

NOMINAL

[mm]

LLSHO

NOMINAL

[mm]

rSSIP

[mm]rSSHO

[mm]rLSIP

[mm]rLSHO

[mm]wSS

[mm]wLS

[mm]hSS EFFECTIVE

[mm]

hLS

EFFECTIVE

[mm]

Frame thickness

[mm]

hSS

ENVELOPE

[mm]

hLS

ENVELOPE

[mm]

hSS MAX

[mm]hLS MAX

[mm]

2.7 7.6896365 7079 7494 7444 7859

955.8 1005.1 1011.8 1061.1 460 680 927.7 953.0 30 897.7 923.0 - -

1.3 30.4894 4168.1 4383.0 4412.4 4627.3 - - 4383.0 4627.3 30 4413.0 4657.3 4460 4647

47.0 -10.3

Referring to what has been presented on 01/02/2013 regarding the radial dimensions of the sectors, due to the NSW (slightly) different position in z, these dimensions have been (slightly) changed:

This means that to cover the desired h range (1.3 ÷ 2.7), the effective detecting area must have the following radial distances from the beam axis:

Small Sectors: from 927mm to 4383mm (zmid SS = 7261.5mm)Large Sectors: from 953mm to 4628mm (zmid LS = 7676.5mm)

Assuming a 30mm thick wedge assembly frame, the large sectors should be extended ≈10mm towards the EIL4 chambers

9

Large Sector envelopeThis cut is necessaryTO BE

CHECKED

The envelope has changed slightly

sTGCs are 59mm shorter than the envelope out

of h range

10

Small Sector envelope

sTGCs are 121mm shorter than the envelope out

of h range

Only 27mm from the spoke CRITICAL

Only 3mm from the spoke CRITICAL