CLIC detector - 2014

Part 1: Forward region and QD0:• there are two options for the endcap yoke• there are three (?) options for the L*

• there are XYZ options for the forward region

CLIC_SiD (5T) CLIC_ILD (4T) with end-coils (H. G.)endcap total: 2805 mm endcap total: 1960 mmendcap iron: 2445 mm endcap iron: 1600 mm

new study by B. Curé:5T field, 9 -> 8 muon stationsendcap total: 1565 mmendcap iron: 1160 mm

l/2 = 7 m

2.8 m

First new CLIC detector layout (F. Duarte Ramos – 6 May 2014, FOR DISCUSSION)

l/2 = 5.6 m

1.4 m

Proposal: (given the results on magnetic field studies etc. so far… use END-COILS)

Work with an overall end-cap thickness of 1.4 m (includes iron + muon detectors)

Forward region and QD0:

• there are two is 1 options for the endcap yoke• there are three (?) two options for the L*

(a) L* = 6.0 m (b) L* = 4.5 m(using a split QD0 in 2 parts;

engineering resembles CLIC_ILD (?))

question of LUMINOSITY LOSS for L* = 6.0 m ???-> for now, we have to keep both options !

• there are XYZ fewer options for the forward region

CLIC_ILD – this could be rather close to the new detector model with L*=4.5 m

for L* = 6.0 m:

“traditional” layout

“radically different” (coffee discussion with H.G.)

(more details next meeting)

Summary yoke end-cap and L*• Propose to reduce yoke end-cap to 1.4 m• Propose to work with two options for L*1. L* = 4.5 m (similar to CLIC_ILD)

engineering aspects: shielding of HCAL end-cap, … ?

2. L* = 6 m many engineering issues to be studied;possibility for much better HCAL forward acceptance

• N.B. We need answers about luminosity (-loss) for the two L* options !

Part 2: Choice of magnetic field