PX156 - K6 - detector design

tracker:
- a $1 G e V$ proton in a $1 T$ field has a bending radius of $1 - 50 m$
- tracker shall have a radius of at least $1 m$
ECAL:
- $x_{0}$ lead $= 0.5 c m$ : ECAL thickness of $\leq 10 x_{0} = 5 c m$
  - but lead is opaque
- $x_{0} P b W)_{4} = 1.3 c m$ : ECAL thickness $= 13 c m$
- - detectors: $20 c m$
HCAL:
- $10 λ_{I}$ iron $= 2 m$
- - detectors: $3 m$
muon:
- $1 - 2 m$
detector: 6-7m in radius already
big heavy detectors are built because the physics constraints of the material used require it
the onion-design can also be used to do particle identification

particle	tracker	ECAL	HCAL	$μ$ chamber
muon	---	---	---	---
$e^{-} / e^{+}$	---	xxx
$γ$		xxx
charged hadron	---	. . .	xxx
neutral hadron		. . .	xxx
neutrino