Chapter 9 - Plug Upgrade Calorimeter

The complete Chapter 9 document is available here.

Figures

Figure 9.1 - Cross section of upper part of new end plug calorimeter.
Figure 9.2 - Transverse segmentation, showing physical and trigger towers in a $30^{\circ}$ section.
Figure 9.3 - Simulation result on the identification probability for electrons from $b \rightarrow e + X$ ($p_t^b>5$ GeV).
Figure 9.4 - EM calorimeter mechanical structure.
Figure 9.5 - Individual EM absorber plate.
Figure 9.6 - Assembly scheme for an EM pizza pan.
Figure 9.7 - Attenuation length distribution for 3 meter long WLS fibers.
Figure 9.8 - Attenuation length for clear fiber at two different wavelengths.
Figure 9.9 - Light yield measurements on samples of Kuraray scintillator extracted from the production scintillator plates: (a) reproducibility of the measurement, (b) sample light yield, (c) sample thickness (d) sample light yield after thickness correction.
Figure 9.10 - Geometry of the SMD in a $45^\circ$ sector.
Figure 9.11 - Response of the SMD fiber/strip assemblies to the collimated and wire-mounted $^{137}$Cs sources.
Figure 9.12 - Correlation (top) and ratio (bottom) between the responses to the collimated and wire-mounted sources.
Figure 9.13 - End plug calorimeter support structure.
Figure 9.14 - Hadron pizza pan cross section.
Figure 9.15 - R&D studies on the optical cross-talk as a function of the thickness of uncut scintillator. The scintillator thickness was 6 mm. Open diamonds indicate the cross-talk when no black line mark is applied below the separation groove. Black symbols indicate the optical cross-talk for the tiles with a black line under the separation groove.
Figure 9.16 - Distribution for the relative light yield of hadron calorimeter fibers assembled in the optical connectors.
Figure 9.17 - Distribution of average scintillator thickness used in the hadron pizza pan production.
Figure 9.18 - Absorption spectrum of the $^{207}$Bi source used to check the light yield of the hadron scintillator plates before production. The position of the highest peak was used to determine the relative light yield of each sample.
Figure 9.19 - Hadron light yield for the first 14 hadron layers.
Figure 9.20 - Transmission across fiber splices.
Figure 9.21 - Schematic view of a 10-fiber optical cable assembly.
Figure 9.22 - Schematic drawings of hadron (left) and EM (right) optical connectors.
Figure 9.23 - Mounting scheme of hadron optical connector on the outer edge of a pizza pan.
Figure 9.24 - Fiber routing scheme on the outer perimeter of the plug. A $30^{\circ}$ section is shown.
Figure 9.25 - Drawing of a fully loaded PMT box. 12 PMT boxes house all the PMTs for an endplug and are mounted on the back face of the plug.
Figure 9.26 - Typical R4125 single-anode PMT gain measurement as a function of the operating voltage (1534 is the tube ID).
Figure 9.27 - A typical R4125 PMT response to the ``pulse-DC" and ``high voltage ramp" tests. The response of the PMT to pulsed light as the DC background light is cycled is seen in the first 12 hours. At approximately 14 and 18 hours the response change due to cycling the PMT supply voltage is shown.
Figure 9.28 - Typical R4125 single-anode PMT stability test over a period of 115 hours.
Figure 9.29 - Percentage deviation from linearity for a typical R4125 single-anode PMT.}
Figure 9.30 - MAPMT single pixel response to an illuminating fiber scanned over the pixel surface in steps of 250 $\mu$m.
Figure 9.31 - Relative responses of the 16 pixels of a MAPMT (Hamamatsu R5900-M16).
Figure 9.32 - Percentage of optical cross-talk between a pixel and its neighbors (Hamamatsu R5900-M16).
Figure 9.33 - Single and double photoelectron peak response for the Hamamatsu R5900-M16.
Figure 9.34 - Schematic drawing of the laser stability monitoring system.
Figure 9.35 - Cross-section view of a stability monitoring system secondary light distribution module (COW).
Figure 9.36 - Schematic view of the projective region covered by the tracking chambers in the cosmic ray setup.
Figure 9.37 - Schematic of an engineering prototype tile-fiber assembly.
Figure 9.38 - Engineering Prototype EM energy resolution obtained from test beam electrons.
Figure 9.39 - Transverse uniformity of response in an EM tower of the engineering prototype.
Figure 9.40 - Engineering prototype hadron energy resolution obtained from test beam pions.
Figure 9.41 - Predicted and observed response to hadrons in the engineering prototype.
Figure 9.42 - Response to 100 GeV electrons and pions in the engineering prototype.