Radiation Physics Beam TestsJ. Bauer, J. Liu, L. Nicolas, S. Rokni, M. Santana

ESTB Workshop 2011March 17, 2011

Introduction

- RP has been a user of primary and secondary beams at SLAC test beam facilities (FFTB, ESA). Last experiments were T489, T493

- RP also conducted experiments at other labs, e.g. CERN (CERF) and PAL (PHERF)

- Previous collaborations with KEK, PAL, CERN and Tsinghua

- The main purpose is benchmarking of Monte Carlo codes that are used in the design/optimization of facilities (personal and environmental radiation protection)

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Recent related research examples (I)Irradiation experiment T489 (28 GeV) at ESA.Benchmarking of activation and residual dose rates

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Recent related research examples (II)Irradiation experiment (2.5 GeV) at PHERF in Pohang Accelerator Laboratory (S. Korea) to study activation of environmental samples and benchmark FLUKA Monte Carlo intra-nuclear cascade code.

Analysis is under way.Further experiments seem necessary to better understand possible FLUKA underestimation of 3H generation as well as of some other radio-isotopes

4ESTB Workshop 2011, March 17, 2011

Areas of interest- Activation and damage measurements

- Activation of accelerator components and environmental samples

- Damage to electronics and magnets- Shielding measurements: attenuation of muons,

neutrons, etc- Measurements of radiation source terms:

- Photomuon production: Crucial for shielding of HE e- beams at zero degree angles (e.g. LCLS)

- Neutron spectra measurements at HE (TOF)- Photonuclear production, angular spectra.

5ESTB Workshop 2011, March 17, 2011

3 experiments in 3 years- Activation and damage measurements

- Activation of accelerator components and environmental samples

- Damage to electronics and magnets- Shielding measurements: attenuation of muons,

neutrons, etc- Measurements of radiation source terms:

- Photomuon production: Crucial for shielding of HE e- beams at zero degree angles (e.g. LCLS)

- Neutron spectra measurements at HE (TOF)- Photonuclear production, angular spectra.

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1) Activation & damage experimentBeam parameters Value Comments

Particle Type e-Energy 4.0 GeV, 13 GeVRep Rate Total: 1E16 e-

Preferably ~30 WCharge per pulseEnergy SpreadBunch length rmsBeam spot size, x-y Known within 5 %Others (emittance, …) Total charge known

within 2 %

Logistics RequirementsSpace requirements (H x W x L) 5 m width x 5 m lengthDuration of Test and Shift Utilization 1 week

Desired Calendar Dates Q1 2012

7ESTB Workshop 2011, March 17, 2011

2) Muon production & shieldingBeam parameters Value Comments

Particle Type e-

Energy 4 GeV, 13 GeV

Rep Rate Max available

Charge per pulse Max available

Energy Spread Known within 5 %

Bunch length rms

Beam spot size, x-y Known within 5 %

Others (emittance, …) Total charge known within 2 %

Logistics RequirementsSpace requirements (H x W x L) 20 m lengthDuration of Test and Shift Utilization 10 days

Desired Calendar Dates Q1 2013

8ESTB Workshop 2011, March 17, 2011

3) Photo-neutron measurementsBeam parameters Value Comments

Particle Type e-Energy 100 MeV, 4 GeV,

10 GeVRep Rate 10-120 HzCharge per pulse Max available MonitoredEnergy SpreadBunch length rmsBeam spot size, x-yOthers (emittance, …) Total charge known

within 2%

Logistics RequirementsSpace requirements (H x W x L) 3 m x 10 m x 10 mDuration of Test and Shift Utilization 2 weeks

Desired Calendar Dates Q1 20149ESTB Workshop 2011, March 17, 2011