J-Cal Construction Plan Tatsuya Chujo University of Tsukuba (for the ALICE J-Cal Project)
Organization (as of April 2009) • Staff : 6 • Y. Miake (Prof.; project leader) • S. Esumi (Assoc. Prof. ; physics analysis, simulation) • T. Chujo (Assist. Prof. ; design, construction) • M. Inaba (Assoc. Prof. ; trigger, readout, electronics) • T. Horaguchi (new post-doc) • M. Shimomura (new RA) • Students : 10+4 D2: K. Watanabe D1: D. Sakata, M. Sano M2: H. Yokoyama, K. Midori, T. Todoroki, E. Hamada, M. Kimura M1: Y. Sekine, T. Takeuchi UG: 4 students.
Detector assembly, workflow and costs • We visited Wayne State Univ. on Dec. 2008, and leaned how to build the modules, strips, and SM from Tom C. and company. • We think that it is possible to make modules (and maybe strips) at Tsukuba, if we have stacking stations locally. • Current plan: building modules (or strips) at Tsukuba, and ship them to CERN (or Wayne State) for the final SM assembly, then install to ALICE.
Stacking station (@ Wayne State Univ.) • To make one module: • < 2 hours for stacking (Pb, Scint) • 24 hours for compression • 24 hours for pressure control and monitor. • Total: 2.1 days • 288 moduels x 2.1 days = 604 days per SM. • We need at least 2 or 3 stacking stations, and pressure control/monitoring systems, in order to make modules in the reasonable speed. • Detail planning and discussions with Wayne State U. are necessary.
Back/front plates, compression plate, support side plates Special parts developed at Wayne Sate. Can be purchased from Wayne State.
Lead Absorber Plates/Scint. Plates. • Pb plates: Vulcan. • Scint: Uniplast, Russia • takes 6 months for the new production. • need a special cutting (at Wayne state)
Fibers, APD, pre-amp., light guide Can be purchased them in Japan WLS fiber: Y11 Si APD: S8664-55 pre-amp: GN-0261-3A APD charge sensitive amplifier
Costs estimates Budget: Total of ≲$1 M (USD) in 5 yrs (Grant in Aid, JSPS). • 1 ALICE EMCal module (4 towers) $1,327 (USD, w/o assembly labor, APD, pre-amp, Strong back, FEE). • 3 SM (= 864 modules) • Mechanical: $ 1,327 x 864 = $ 1,146,528 (USD) • Readout: ~$50 (APD, preamp) x 4 x 864 = $172,800(USD) • FEM (4x864 = 3,456 ch, 26 CHF/ch) : $ 89,856(USD) • Total: ~$1.4 M (USD) + Mechanical support + shipping cost.
Timeline 2009 2010 2011 2012 Install SM Install Frame B-to-B Trigger inst Detector Construction Proto-type building Buying Parts, Production prepare 1st module assembly shipping 1st SM assembly APD calibration and make DB shipping shipping 3rd SM assembly 2nd SM assembly 2nd module assembly 3rd module assembly Analysis tool development Data Analysis (p+p, Pb+Pb) Trigger programming dev. Physics Results p+p Pb+Pb p+p 6 month LHC shutdown Frame design Frame building
Parts for proto-type (for 1 module) Lead tiles (inside the box) Courtesy of Tom Cormier
Summary on construction • We are proposing to build and install the same EMCal on the opposite side of the ALICE-EMCal, to enhance the capability of B-to-B jet physics. • Acceptance: 3 SM of ALICE-EMCal (1.0 x 0.7). • Modules (or Strips) can be built at Tsukuba, and ship them to CERN (or Wayne State Univ.) for the final SM assembly and installation . • Need new support structure for the J-Cal. • Start the mass production in Fall/Winter 2009. • Current target date: installation from summer 2010.
Naming conventions (ALICE-EMCal) • 1 module = 4 towers (4 APD readouts, 1 readout = 6x6 (holes) = 36 WLS fibers) • 1 strip = 12 modules • 1 super module (SM) = 24 strips • 1 SM = ½ sector • 1 sector = 2 SMs.
ALICE-EMCal Physics Parameters 1SM : 22 degrees (0.4 rad) in phi, 0.7 in eta.