CMS combined Ecal-Hcal testbeam
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1 CMS combined Ecal-Hcal testbeam Lisa Berntzon, Texas Tech. University, on behalf of the CMS Collaboration IPRD06 Siena 1-5 Oct 2006 Siena 2006 Lisa Berntzon 1
2 CMS calorimeter system HCAL : HB - Hcal Barrel HE - Hcal Endcap HO- Hcal Outer detector Sampling Calorimeters: scintillators and brass (Cu, Zn) ECAL : EB Ecal Barrel PbWO 4 crystals ECAL Barrel HF Siena 2006 Lisa Berntzon 2 HO HB HE
3 TestBeam First CMS combined Ecal + Hcal testbeam with real Ecal supermodule, in the testbeam 2004 the response was measured using a prototype Ecal module (7x7 crystals, PMT readout). - much improved beamline was commissioned, which provides various types of particles in the momentum range from GeV/c : VLE: Very Low Energy beamline 1-9 GeV/c h- h+ e- e+ using tertiary target and special beam optics particle ID: using TOFs, Cherenkovs and large scintillation counters, we are able to tag (anti-)protons, kaons, pions, electrons and muons. - Data-sets collected include: Calibration data (e, muons and source), Energy scans, Crack studies, Longitudinal shower profiles, etc - Running was completed 19 th of September, results shown here are very preliminary first results, the analyses are still ongoing. Siena 2006 Lisa Berntzon 3
4 TB06 at H2, Hcal and Ecal: Siena 2006 Lisa Berntzon 4
5 CMS geometry at H2 A phi slice of CMS HCAL: HO - HB: 2 wedges 8 φ segments Δφ = 40deg. HB HE -HE: 4 φ segments Δφ = 20 deg. - HO: Ring 0, 1 and 2. beam pivot ECAL: 1 SuperModule (SM9) Pivot of table, makes possible to mimic Interaction Point at LHC Siena 2006 Lisa Berntzon 5
6 Beamline VLE-beamline Very Low Energy (VLE) line is able to provide 1 to 9 GeV/c h+, h- and e+/ewith good rate, a few hundred/spill using a tertiary target (T22). Particle ID is accomplished by TOFs, CKs and muon veto counters. High energy line covers a momentum range from: -10 to 300 GeV/c for hadrons -10 to 150 GeV/c for e-/e+, through secondary particle production. This beam line is unique, and is well-suited for calorimetry Siena 2006 Lisa Berntzon 6
7 Cuts for beam cleaning (Removing Interaction in beam line) We require a single particle in the scintillating counters: S1 and S4 (14x14 cm 2 ) S2 (4x4 cm 2 ) S3 (2x2 cm 2 ). R29973, 4 GeV π+ Beam particles at large angles are removed using beam halo (BH) counters (7x7cm 2 square) Siena 2006 Lisa Berntzon 7
8 Particle ID Muon Veto Cherenkovs electrons: CK2 for p<9gev, CK3 for p<3gev muons: Muon Veto front/back, Muon Veto Wall protons: CK3 (off) and TOF for 1-9GeV kaon: TOF for p<4gev and CK3 (off) & not-proton pion: rest. Siena 2006 Lisa Berntzon 8
9 Particle ID -TOFs Siena 2006 Lisa Berntzon 9
10 VLE beam cleanup In TB2004 there was a large number of beam particles interacting in the beam line and creating junk events around (0,0). This was a major source of systematic error and prevented the analyses of data below 5 GeV. In TB2006 the beam line interactions were successfully removed by single hit requirement, and the lowest energy point was extended to 1GeV. TB04 TB06 TB06 Preliminary Many junk events No more junk Siena 2006 Lisa Berntzon 10
11 5 GeV pi+ : After beam cleaning and paricle ID cuts, 1/3 of the events remain, pure pion events. Siena 2006 Lisa Berntzon 11
12 Electrons First look at the linearity, using preliminary calibration TB06 Preliminary TB06 Preliminary Siena 2006 Lisa Berntzon 12
13 Low energy electrons 1 GeV 2 Gev 3 GeV 4 GeV 5 Gev 6 GeV 7 Gev 8 GeV 9 GeV 50 Gev without preliminary calibration TB06 Preliminary Siena 2006 Lisa Berntzon 13
14 Bananas: Hcal vs Ecal TB06 Preliminary Siena 2006 Lisa Berntzon 14
15 9 GeV 7 GeV More Bananas, Very low energy runs TB06 Preliminary 5 GeV 3 GeV 2 GeV Siena 2006 Lisa Berntzon 15
16 Reconstructed Ecal, Hcal response TB06 Preliminary GEANT4 For the first time, we have a complete set of low energy data for pions, kaons and (anti)protons for the combined ECAL+HCAL. These data are essential to correctly estimate the jet response of the CMS calorimeter system. Siena 2006 Lisa Berntzon 16
17 Back up slides Siena 2006 Lisa Berntzon 17
18 preliminary calibration used for Ecal: Electron calibration: wide beam Siena 2006 Lisa Berntzon 18
19 Longitudinal Shower Development One HCAL Barrel wedge had 17 layers of Long. Readout. 9 GeV 7 GeV 5 GeV 3 GeV 2 GeV 1λ Siena 2006 Lisa Berntzon 19
20 2 time of flight scintillators. Online resolution 250 ps Siena 2006 Lisa Berntzon 20
21 Setup of TestBeam 2004 prototype Ecal: 7x7 crystals, PMT readout Siena 2006 Lisa Berntzon 21
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