Title: Current Status for ILC work using MARS15 Monte Carlo
1Current Status for ILC work using MARS15 Monte
Carlo
Noriaki Nakao Fermilab
2MARS15 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
3ILCTA Fermilab Test Area (750MeV Linac)
Cryo-1
Cryo-2
Cryo-3
RF Gun
small Dump
Main Dump
4Fermilab 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)
5Optimal Design
Main dump
150 cm thick concrete shielding
Iron dump 290 cm x 340 cm x 450 cm long
6Prompt Dose Sump water activation
0.1 mrem/hr
100
70.1 mrem/hr
Small dump
0.1 mrem/hr
0.1 mrem/hr
0.5
8Radiation Loads Damagein ILC Cryomodule
MARS15 Radiation Simulation to Cryomodule
Temperature Sensors
9MARS15 Model
10MARS15 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
11Prompt Dose Rate
Prompt Dose Rate (mSv/hr)
Side View (Integrated over diameter length) 250
GeV case
12Prompt Dose Rate
Power Density
Cross Sectional View (Integrated over 10 m long
111m range) 250 GeV case
13Particle Energy Spectra at Thermister location
g
250 GeV
750 MeV
e
g
FLUX (arbitarary)
FLUX (arbitarary)
n
e
n
p
p
14Need 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
-
-
15ILC Beam Diagnostic Labin North Illinois
University (NIU)
Building MARS Model Evaluation for
Shielding and Maze Design
16Beam 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
17Basic 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
18Shielding structure atBeam Diagnostic Laboratory
19MARS15 geometry
20Prompt doseestimationby MARS15
Prompt Dose Rate lt 1 mrem/hr - Outside concrete
shielding wall - Exit of Maze ? Should Review
dump wall design