Albert TsutskikhAnatoli Krasilnikov

Yuri KaschuckDenis Prosvirin

SRC RF TRINITI11 of April 2006

Status of Vertical Neutron Status of Vertical Neutron Camera IntegrationCamera Integration

VNC Purposes

• Collimated measurements of neutron source profile with spatial resolution along ITER major radius

• Total neutron yield (fusion power) measurement

• Optimization of the schemes of additional heating, including ICRH in particular

VNC Plasma Coverage

Collimator lengths 1,4 – 1,6 m

Diameters 30 mmCoverage from –0.7 to 0.7 ρ

Divertor Port #2 Arrangement Drawing

Blanket module #18

Divertor cassette

Neutron collimator block

Detectors modules

3D view

Removable Rail Part with collimator block

Added block part for diverter

Detector modules

MCNP – A General Monte Carlo N-Particle Transport Code

• Program MCNP (Transport Methods Group Los Alamos National Laboratory)

• Version 4C• Cross-section library “endf601” (Evaluated Nuclear Data File)

MCNP Model of ITER

CoilsIntercoil structure

Collimator Block

Blanket module #18 with slot

Diverter Cassette with block part

MCNP Model of ITER

MCNP Model of ITER

MCNP Model of VNC

Model of Source

2

1

arf

Source spatial distribution

En=14.1 MeV

Source density distribution

0

0,2

0,4

0,6

0,8

1

-200 -100 0 100 200

Minor radius, cm

Rela

tive

dens

ity

Calculation results

signal/backgroundchannel no. FC NDD

1 0,224 4,2242 8,212 27,9743 15,703 53,4364 22,454 55,1275 28,841 95,3436 23,312 97,1527 8,684 28,7778 4,007 10,9409 2,525 8,712

10 0,829 3,528

Calculation resultsfor U-238 FC, threshold – 1 MeV & NDD, threshold 7 MeV

signal/bacnground ratio for VNC ITER

010

2030

4050

6070

8090

100

1 2 3 4 5 6 7 8 9 10channel no.

signa

l / ba

ckgr

ound

ratio

FC NDD

Signal – flux of nonscattared neutrons, Signal – flux of nonscattared neutrons, background – flux of scattered neutronsbackground – flux of scattered neutrons

Calculation results

Neutron Distribution in Channel

1,00E-16

1,00E-13

1,00E-10

1,00E-070 2 4 6 8 10 12 14 16

En, MeV

Neut

ron

flax

(n cm

2 s-1 /sour

se n

eutro

n) # 1

# 2

# 3

# 4

# 5

# 6

# 7

# 8

# 9

# 10

New Problem #1From L. BertalotInterface Divertor cassette – Interface Divertor cassette – Rail (second part of collimator Rail (second part of collimator block)block)

New Problem #2

Need to verify if complete assembly fits inside the cask

From L. Bertalot

New Problem #3

Fixed to the Cassette Body

From L. Bertalot

New Problem #4

Integrates the Rail

Integrates the Locking Pins

From L. Bertalot

Conclusions• Lengths of collimators are enough for effective

VNC operation. Correction coefficient should be applied for channel #1 & #10.

• Integrated with divertor cassette Lower VNC is providing required collimation and plasma coverage for both (238U FC, NDD) discussing detectors.

• Interface issues (integration with divertor cassette, interface with removable rail part and blanket module) could be solved during further design activity.

• Procedure of assembling and installations• Tools for installation• Mechanical prelifting construction and other modification

divertor cassette • Alignment and calibration• Mechanical details of rail• Agreement of blanket module # 18 modification to provide

VNC lines of site penetration• Interfaces with other port diagnostics • Cable connections and communications • Analysis of tomography possibilities with discussing RNC

and VNC lines of sight

MUST BE SOLVED