Current Status for ILC work using MARS15 Monte Carlo - PowerPoint PPT Presentation

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Current Status for ILC work using MARS15 Monte Carlo

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... Realistic MARS Model & Evaluation of Shielding and Maze design Radiation Calculation and optimization of dump shielding for Main Beam dump 750 MeV ... – PowerPoint PPT presentation

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Title: Current Status for ILC work using MARS15 Monte Carlo


1
Current Status for ILC work using MARS15 Monte
Carlo
Noriaki Nakao Fermilab
2
MARS15 Monte Carlo for Radiation Calculation
  • ILC Beam Delivery System, Machine-Detector
    Interface,
  • Extraction System
  • 20 2 mrad IP ? 14 14 mrad IP (model
    will be updated)
  • ILCTA Fermilab ILC Test Area (750MeV Linac)
  • - Beam dump Beam line shielding
    optimization
  • Cryomodule in ILC Main Linac
  • - Radiation Loads and Damage of Component

  • (Thermister etc.)
  • ILC Beam Diagnostic Laboratory in North Illinois
    University (NIU)
  • - Realistic MARS Model Evaluation of
    Shielding and Maze design

3
ILCTA Fermilab Test Area (750MeV Linac)
Cryo-1
Cryo-2
Cryo-3
RF Gun
small Dump
Main Dump
4
Fermilab ILC Test Area (ILCTA )
  • Radiation Calculation and optimization of dump
    shielding for
  • Main Beam dump
  • 750 MeV 40 kW electron beam, 3000
    bunches
  • Small Beam dump
  • 750 MeV 40 W electron beam, 1 bunch
  • Unlimited Access Conditions in TA (lt 0.1 mrem/hr)

5
Optimal Design
Main dump
150 cm thick concrete shielding
Iron dump 290 cm x 340 cm x 450 cm long
6
Prompt Dose Sump water activation
0.1 mrem/hr
100
7
0.1 mrem/hr
Small dump
0.1 mrem/hr
0.1 mrem/hr
0.5
8
Radiation Loads Damagein ILC Cryomodule
MARS15 Radiation Simulation to Cryomodule
Temperature Sensors
9
MARS15 Model
10
MARS15 Model for Cryomodule
Cryomodule consists of 8-9cell cavities (12m
long)
750 MeV or 250 GeV intensity (arbitarary)
1mrad uniform loss inside cavity
9cell cavity
11
Prompt Dose Rate
Prompt Dose Rate (mSv/hr)
Side View (Integrated over diameter length) 250
GeV case
12
Prompt Dose Rate
Power Density
Cross Sectional View (Integrated over 10 m long
111m range) 250 GeV case
13
Particle Energy Spectra at Thermister location
g
250 GeV
750 MeV
e
g
FLUX (arbitarary)
FLUX (arbitarary)
n
e
n
p
p
14
Need more info on source term
  • Source Term
  • Power?
  • Distributions of energy, angle, location?
  • for
  • - Beam halo
  • - Dark Current
  • Fowler-Nordheim Model
  • (TESLA Report 2003-10)
  • ? Simplified source term?
  • RF Gun Cathode (same as
    beam energy, beam direction)
  • Wave Guide
  • Beam Secondary Interaction

15
ILC Beam Diagnostic Labin North Illinois
University (NIU)
Building MARS Model Evaluation for
Shielding and Maze Design
16
Beam Diagnostic Laboratory C. Bohn, P.Piot at
el. (NIU)
  • RD on charged particle beam diagnostics
  • for
  • ILC (ILCTA at Fermilab, AWA at Argonne)
  • FEL,
  • proton driver
  • Ultimate goal
  • Operate a low-average-current, 620MeV
    racetrack-microtron accelerator to drive coherent
    light source
  • MOU between NIU FNAL

17
Basic beam line design atBeam Diagnostic
Laboratory
ltBeam Parametergt 620 MeV 10 A in peak 6uA in
average Bunch 0.44 nC 10-20ps(total)
2.856 GHz Pulse 1 Hz
18
Shielding structure atBeam Diagnostic Laboratory
19
MARS15 geometry
20
Prompt doseestimationby MARS15
Prompt Dose Rate lt 1 mrem/hr - Outside concrete
shielding wall - Exit of Maze ? Should Review
dump wall design
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