Discussion session Carsten Hast, Mauro Pivi SLAC

Andy White University of Texas at Arlington For GEM DHCAL Group ESTB Workshop SLAC 2012 Introduction KPiX Readout FTBF Beam Test Setup Beam Test Analysis Results Large Chamber Development GEM DHCAL Plans + Test beam needs 7 GEM DHCAL A. White Application of Large Scale Gas Electron Multiplier Technology to Digital Hadron Calorimetry

Toward 100cmx100cm GEM Planes!! GEM DHCAL A.White 8 Two 33cmx100cm chamber parts delivered Class 10,000 clean room (12’x8’) construction completed Jig for 33cmx100cm chamber being procured Assembly jig Anode Spacer GEM Foil Positioners

Parameters required for Beam Tests Beam parametersValueComments Particle Typee- would positrons be ok? Yes Energy (2-13 GeV)Any ? Rep Rate (1-5 Hz nominal, Bursts up to 120 Hz) Can use up to 120 Hz Charge per pulse or number of electrons/pulse 1 e-/pulseHow short is a pulse? Interval? Energy SpreadNot critical Bunch length r.m.s.? Beam spot size, x-y, emittance  x x  y ~ 0.5 x 0.5 cm2 or smaller Others (cooling water, gasses, etc.)Ar CO2 80:20 LogisticsRequirements Space requirements (H x W x L)6x6x10 ft3) Others (cooling water, gasses, electricity, etc.)Ar CO2 80:20 Duration of Test and Shift Utilization2 x 2 weeks Desired Calendar DatesSpring, Fall 2013 To the presenter at the ESTB 2012 Workshop: please, fill in/update the table (at best) with the important parameters needed for your tests

Plans for Radiation Damage Studies for Si Diode Sensors Subject to 1 GRaD Doses Bruce Schumm SLAC Testbeam Workshop August

14 The Issue: ILC BeamCal Radiation Exposure ILC BeamCal: Covers between 5 and 40 miliradians Radiation doses up to 100 MRad per year Radiation initiated by electromagnetic particles (most extant studies for hadron – induced) EM particles do little damage; might damage be come from small hadronic component of shower? Bruce Schumm

SUMMARY ILC BeamCal demands materials hardened for unprecedented levels of electromagnetic-induced radiation 10-year doses will approach 1 GRad. Not clear if hadrons in EM shower will play significant role  need to explore this At 1 nA, 1 GRad takes a long time (60 hours); multiply time ~10 samples  really long time More beam current (?) Start with 100 MRad studies (already interesting) Bruce Schumm

Parameters required for Beam Tests Beam parametersValueComments Particle Typee- Positrons would be fine Energy (2-13 GeV)Maximum Rep Rate (1-5 Hz nominal, Bursts up to 120 Hz) MaximumAs long as we can figure out how to handle 500W Charge per pulse or number of electrons/pulse Maximum Energy SpreadNot a concern Bunch length r.m.s.Not a concern Beam spot size, x-y, emittanceLess than ~1mmRastering would be very helpful! Others (cooling water, gasses, etc.)Rastering, cooling (W or Pb?)Tungsten for target? (Otherwise Pb) LogisticsRequirements Space requirements (H x W x L)  m x 1m x 1m (plus 20cm x 20cm x 20cm 1-2 m upstream) Others (cooling water, gasses, electricity, etc.)Need to figure out how to cool 500W Duration of Test and Shift UtilizationAbout 1 week; perhaps no owl? Whatever we could get really. Desired Calendar DatesWinter 2013 To the presenter at the ESTB 2012 Workshop: please, fill in/update the table (at best) with the important parameters needed for your tests Bruce Schumm

Steve Wagner

Iowa Test Plans for ESTB B. Bilki, Y. Onel University Of Iowa

Digital Hadron Calorimeter (DHCAL) Tests Development of low-resistivity glass is underway in collaboration with the COE College, Cedar Rapids, Iowa. Might need to test RPCs with different glass samples in beam. Variable particle rate over 50 – 2000 Hz/cm 2 is needed. Secondary Emission (SE) Calorimetry Tests In an SE detector module, secondary electrons are generated from an SE cathode when charged hadron or electromagnetic shower particles penetrate the SE sampling module placed between absorber materials in calorimeters. A prototype SE module is being built with alternating layers of multianode PMT arrays and steel absorbers (first stage involves testing a single layer with an absorber of variable thickness). Dual Readout/Crystal Calorimetry Different crystal samples with different readouts. Test for the time and spatial development of scintillation and Čerenkov light. Readout with SiPMs and PMTs directly coupled to the crystals. Test for different crystal properties (surface finish, wrapping, etc.) Precise beam position measurement is needed (wire chambers, etc.)

Parameters required for Beam Tests Beam parametersValueComments Particle Typee- would positrons be ok? - Yes Energy (2-13 GeV)2-13 GeVStage II hadrons?? Rep Rate (1-5 Hz nominal, Bursts up to 120 Hz) Charge per pulse or number of electrons/pulse Low rate: Hz High rate: 50K 1 Hz Energy Spread<0.1% Bunch length r.m.s. Beam spot size, x-y, emittanceWould need position detectors (wire chambers, …) Others (cooling water, gasses, etc.) LogisticsRequirements Space requirements (H x W x L) 1x1x1 m 3 – 5x5x5 m 3 Others (cooling water, gasses, electricity, etc.) Duration of Test and Shift Utilization  week, hour shifts/day Desired Calendar Dates Flexible about schedule depending on beam availability

Update on FACET at SLAC Christine Clarke 23 rd August 2012 ESTB Users Meeting

Introduction to FACET FACET uses 2/3 SLAC linac to deliver electrons to the experimental area in Sector 20 The FACET dump separates FACET from LCLS Our first User Run was April-July Facility for Advanced Accelerator Experimental Tests 41

42 Beam Parameters ParameterTypical Value 2012Best Value 2012 Energy (GeV)20.35 Charge per pulse2.7 nC (1.7e10 e-)3.0 nC (2.0e10 e-) Bunch length σ z (μm) Beam size σ x x σ y (μm) 35 x 3520 x 23 ParticleElectrons Positrons will be commissioned in 2013 for delivery to experiments in sector 20 in 2014.

E-200 Multi-GeV Plasma Wakefield Acceleration SLAC, UCLA, MPI FACET’s high power electron beam ionises alkali gas and interacts with the plasma, wakefields accelerating part of the bunch Lithium – small interaction, occasionally significant acceleration observed Rubidium - consistently lots of interaction and good acceleration 43 Beam bypassing plasmaBeam going through plasma Significant interaction (energy loss) Energy gain by ~8% of beam

44 Looking Ahead… FACET’s second User run is in winter/spring Proposals for 2013 and 2014 currently welcome! - The proposal deadline is 1 st September - FACET User Meeting 9 th /10 th October - Next SAREC review 11th/12 th October New features to the facility are coming: - E-200 is installing a 10TW Laser to pre-ionise plasma - Positrons will be commissioned in 2013 for delivery to experiments in Designs for a THz transport line are in place to take THz up to the laser room FACET continues to run ~4 months/year until 2016