CMS TEST BEAM & HF WORK BY TASK K

1. CMS TEST BEAM & HF WORK BY TASK K PM end of HF, August ’07, in pit

2. CMS / HF SUMMER WORK BY BOSTON UNIVERSITY • 2007 CMS HCAL/ECAL test beam • many shifts Carleton & Sulak • prototypical slice of HCAL & ECAL of CMS in CERN H2 beam line • pion, proton, muon, electron beams, 2 GeV - 450 GeV • evaluation of HF punch-through problem helping Freeman • HF Super-LHC upgrade tests: quartz plates helping Winn et al. • solid state Si PMTs • BU H2 initiative: CMS Data Quality Monitoring (DQM) Plotter by Carleton for Sulak to debug beam • scripts written for H2 DQM histograms • automatic dumped after each run, compare with other runs • used PHP to create web-based script to display arbitrary histograms • including beam type, energy, run time, date • option of sorting by run number, date, or beam type • select which set of histograms for each run. see 2 displays • shift crew can instantly recognize element failure, gradual shifts, etc. • used in real time during video conferences with FNAL • remedying a major CMS lack: a user-friendly plotting system • CMSSW has largely nonfunctional web pages; fail to make histograms • ECAL: display certain types of data, makes a limited number of histograms, only ECAL • Extrapolating H2 Histogrammer to a CMS-wide system for FY ‘08 with Sergei Gleyzer FSU/ECAL • web-based histogrammer • access central ORACLE database of CMS, using PHP • cross-correlate data from any CMS subdetector • end product: user selects any two CMS quantities, plots for a range of runs or dates • data retrieved, histogram created using ROOT (CERN-developed C++ derivative) • current enhancements in process: view sample histograms for given quantities • searchable database of created histograms • in '08 will distribute fully debugged version to the CMS community • quickly generated, custom histograms • cabled HF+ and HF- data acquisition electronics with guidance from Dick Kellogg

3. cabling up the HF electronics in counting house

4. BU CMS histogrammer developed for H2 Test Beam Data ‘07

5. …histogrammer showing pop up functionality for two histos

6. A retrofitted tail catcher for HF? ...mitigating the "shower punch-through into pm" problem 1998-2003 development of TDR design for HF led by this DOE Task many prototypes built at BU (continuation of GEM/SSC), interactive with extensive simulations decade long series of test beams of our prototypes @ BNL, FNAL, then CERN Well-known challenge at the time: untagged, penetrating hadrons - falsely interpreted as missing energy in SUSY searches late developing showers into PMs & guides - big signals fake missing energy signal other side BU solutions: 1) PMs put in shielded region far from beam pipe outside region of shower remnants fiber bundles turn  to beam immediately at exit from absorber & as short as possible 1 m long air light guides  to beam lead to large radius technology by Osborne 2) a tail catcher after main absorber tagged late-developing showers but...eventually costs of other parts of US/CMS  budget restrictions  HF severely compromised a) air light guides eliminated...PMs placed right in the tail of showers b) tail catcher abandoned 2006 CERN Test Beam of wedge of final HF: "unanticipated" spuriously big pulses!!! Carleton on shift 2007 Summer Test Beam: Mockup of HF in : Sulak & Carleton on shift big pulses come from showers entering PMs Freeman 2007 BU in situ investigation HF: retrofitting a tail catcher to HF may be straightforward no mechanical or electronic show stoppers, sufficient spare slots & space for cable runs Simple HF Tail Catcher Retrofit: 1) attach a quartz plate on the handles of the PM box behind each of 36 wedges of HF, each plate covering 24 PMs 2) transport Cherenkov photons with 1 m air light guide to high radius behind shielding 3) sense light with inexpensive a) small PM, or b) a silicon PM (SiPM) 4) run cables from PMs to spare slots in standard HF front end cards in spare slots of HF crates 5) 6 additional fiber optic cables travel in spare space of "accordion tray" 6) standard DAQ cards in spare slots of HF crates take data in counting room see 4 pictures Proposed Goal in FY'08 prototype then implement a quartz plate channel covering one wedge to evaluate in early LHC running Team: Osborne, Heitor Mourato (instrument shop director), Hazen, Carleton (UROP & summer) Phil Lawson (seasoned PhD student with 4 years hardware experience at NIST)

7. HF- summer 2007 Note the following: PM boxes w/cables exiting left to front end crates orange steel shielding plugs of anti-neutron concrete Space for quartz covering PM boxes air light guides tail-catcher PMs or SiPMs at periphery

8. cabled boxes of 16 PMs: mount wedge-shaped quartz plate covering each funnel light out to edge of orange shielding

9. extra slots at left of each crate on HF for additional front end modules Matt Carleton

10. extra space in cable accordion for optical fibers to travel to counting house

11. Tail catcher retrofitting possibility checked out… HF cabling completed!