Discussion session

Carsten Hast, Mauro PiviSLAC

Andy WhiteUniversity of Texas at Arlington

For GEM DHCAL GroupESTB Workshop SLAC 2012

• Introduction• KPiX Readout• FTBF Beam Test Setup• Beam Test Analysis Results• Large Chamber Development• GEM DHCAL Plans + Test beam needs

7GEM 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

Positioners

Parameters required for Beam Tests

Beam parameters Value Comments

Particle Type e- 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-/pulse How short is a pulse? Interval?

Energy Spread Not 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

Logistics RequirementsSpace requirements (H x W x L) 6x6x10 ft3)Others (cooling water, gasses, electricity, etc.) Ar CO2 80:20Duration of Test and Shift Utilization 2 x 2 weeks

Desired Calendar Dates Spring, 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 SchummSLAC Testbeam WorkshopAugust 23 2012

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The Issue: ILC BeamCal Radiation ExposureILC 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 parameters Value Comments

Particle Type e- Positrons would be fine

Energy (2-13 GeV) Maximum

Rep Rate (1-5 Hz nominal,Bursts up to 120 Hz)

Maximum As long as we can figure out how to handle 500W

Charge per pulse or number of electrons/pulse

Maximum

Energy Spread Not a concern

Bunch length r.m.s. Not a concern

Beam spot size, x-y, emittance Less than ~1mm Rastering would be very helpful!

Others (cooling water, gasses, etc.) Rastering, cooling (W or Pb?) Tungsten for target? (Otherwise Pb)

Logistics Requirements

Space requirements (H x W x L) 1m 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 Utilization About 1 week; perhaps no owl? Whatever we could get really.

Desired Calendar Dates Winter 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. OnelUniversity 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/cm2 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 parameters Value Comments

Particle Type e- would positrons be ok? - Yes

Energy (2-13 GeV) 2-13 GeV Stage II hadrons??

Rep Rate (1-5 Hz nominal,Bursts up to 120 Hz)

Charge per pulse or number of electrons/pulse

Low rate: 50-400 electrons/pulse @ 1HzHigh rate: 50K electrons/pulse @ 1 Hz

Energy Spread <0.1%

Bunch length r.m.s.

Beam spot size, x-y, emittance Would need position detectors (wire chambers, …)

Others (cooling water, gasses, etc.)

Logistics Requirements

Space requirements (H x W x L) 1x1x1 m3 – 5x5x5 m3

Others (cooling water, gasses, electricity, etc.)

Duration of Test and Shift Utilization 1 week, 2-3 8-hour shifts/day

Desired Calendar Dates Flexible about schedule depending on beam availability

Update on FACET at SLAC

Christine Clarke 23rd 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 2012

http://facet.slac.stanford.edu

Facility for Advanced Accelerator Experimental Tests

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Beam Parameters

Parameter Typical Value 2012 Best Value 2012

Energy (GeV) 20.35

Charge per pulse 2.7 nC (1.7e10 e-) 3.0 nC (2.0e10 e-)

Bunch length σz (μm) 20-25 20

Beam size σx x σy (μm)

35 x 35 20 x 23

Particle Electrons

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

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Beam bypassing plasma Beam going through plasma

Significant interaction (energy loss)

Energy gain by ~8% of beam

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Looking Ahead…

• FACET’s second User run is in winter/spring 2013- Proposals for 2013 and 2014 currently welcome!

https://slacportal.slac.stanford.edu/sites/ard_public/facet/user/Pages/ProposalOverview.aspx

- The proposal deadline is 1st September

- FACET User Meeting 9th/10th October

http://www-conf.slac.stanford.edu/facetusers/2012/

- Next SAREC review 11th/12th 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 2014

- 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