DØ Calorimeter Characteristics

The DØ Calorimeter is (almost) symmetric in phi and (almost) symmetric in positive and negative eta. There are nominally 37 readout towers for each phi slice in positive or negative eta, labelled ieta 1-37.

There are 17 different "layers" in the calorimeter, with one tower having up to 12 layers. These are characterized in Table 1. The full addressing scheme can be found in the Run 1 D0 Note 774 by Jim Linnemann.

Table 1: Calorimeter Layers

ilayer	Layer type
1	EM1
2	EM2
3	EM3a
4	EM3b
5	EM3c
6	EM3d
7	EM4
8	CCMG
9	ICD
10	ECMG
11	FH1
12	FH2
13	FH3
14	FH4
15	CH1
16	CH2
17	CH3

The plots below show the average capacitance, layer weights and noise for each tower.

Fig 1. Capacitance (pF) for all layers plotted as a function of tower

Fig 2. Capacitance (pF) for all towers in a phi slice (iphi = 1) for positive eta

Fig 3. Layer weights for all towers in a phi slice (iphi = 1) for positive eta. Units are relative.

Fig 4. Noise levels (one-sigma in GeV) after linearity corrections for all towers in a phi slice (iphi = 1) for positive eta