Proposed Indian Spallation Neutron Source

1
Proposed Indian Spallation Neutron Source

• S. Kotaiah

2
Schematic Layout of SNS
3
Choice of Parameters

• For given output power of booster (100 kW)
• Injection energy
• Booster energy
• Repetition frequency

Technical compatibility minimum cost
4
Choice of Parameters
5
Choice of Parameters (cont.)
6
ParametersLinac cost

7
ParametersSynchrotron cost

8
ParametersTotal cost

9
Chosen Parameters

• Injection Energy 100 MeV
• Booster Energy 1 GeV
• Repetition Rate 25 Hz
• Beam Power 100 kW

10
Brief Parameters

• Proton Synchrotron

11
Brief Parameters

• Injection Linac

12
RF driven multicusp H- Ion Source

• Parameters
• Components
• Plasma chamber and vacuum system
• Magnetic field configuration
• RF generator / amplifier and impedance matching
  network
• Magnetic filter and RF antenna
• High voltage insulator dome and platform
• Beam extraction system
• Supervisory control system

13
...RF driven multicusp H- Ion Source

14
Chopping Scheme

15
RFQDesign Parameters
16
RFQ

• Segment Module
• Assembly

17
DTLGeometric Details
18
100 MeV DTL Summary
19
100 MeV DTL Summary cont.
20
Engineering Design of DTL

• Structural stability of cylindrical cavity
• Thermal stability of DTL tank and drift tubes
• RF and Vacuum compatibility of the structure
• Cooling circuit design and layout
• Vacuum system design of Proton linear
  accelerator.
• Support and alignment system

21
DTL
22
RF System for RFQ and DTL

• Designed in 1 MW modules, total 17 modules
• One module for RFQ and 16 for DTL
• (RFQ operating at 350 MHz needs 750 kW RF power,
  615 kW loss 135 kW beam power)
• Designed for 100 MeV, 25mA beam of 500 µs
  duration with 25Hz repetition
• Components of a module
• High power klystrons 1MW/2MW at 350 MHz
• Klystron pulse modulator
• Waveguide transmission system
• Driver amplifiers
• Low level electronics
• Safety interlocks, and supervisory control
  systems

23
RF SystemKlystron Specifications

• Frequency of operation 350MHz/-2.5MHz
• Output peak power 1MW or 2MW
• Output RF pulse duration 700 µs
• Gain 43dB
• Maximum drive power 200W
• Efficiency 60
• Output waveguide WR 2300
• Focusing Electromagnet

24
RF Feed for 100 MeV Linac

25
Proton Synchrotron

• Layout and Lattice

26
Proton Synchrotron

• Parameters

27
Proton Synchrotron

• Parameterscont.

28
Proton Synchrotron Magnet System

• General Specifications

29
Proton Synchrotron Magnet System

• Dipoleparameters
• Cross Section

30
Proton Synchrotron Magnet System

• Quadrupoleparameters
• Cross Section

31
Proton Synchrotron Magnet System

• Sextupoleparameters
• Cross Section

32
Proton Synchrotron Magnet System

• Injection systempulsed magnets

33
Proton Synchrotron Magnet System

• Parameters of Injection Magnets

34
Proton Synchrotron Magnet System

• Parameters of Extraction Kickers
• Parameters of Extraction Septums

35
Proton Synchrotron Power Supplies

• Magnet Specifications (Electrical)

36
Proton Synchrotron Power Supplies

• Magnet Current Waveform

37
Proton Synchrotron Power Supplies

• Resonant Excitation Scheme

38
Proton Synchrotron Power Supplies

• White Circuit

39
Proton Synchrotron Power Supplies

• Resonant Circuit Components

40
Proton Synchrotron Power Supplies

• Estimated Power Losses

41
Proton Synchrotron Power Supplies

• Field Regulation

42
Proton Synchrotron Power Supplies

• Phase Regulation

43
Proton Synchrotron - Pulse Power Supplies

• Power Supplies for Injection Magnets

44
Proton Synchrotron - Pulse Power Supplies

• Power Supplies for Extraction Magnets

45
Proton Synchrotron - Pulse Power Supplies

• Schemes
• Vertical dipole magnet p/s Bumper magnet p/s
• Extraction kicker magnet p/s

46
Proton Synchrotron RF System

• Parameters

47
Proton Synchrotron RF System

• RF Cavity
• Geometrical Parameters

48
Proton Synchrotron RF System

• RF Cavity
• Schematic

49
Proton Synchrotron RF System

• RF Cavity
• Operating Characteristics

50
Proton Synchrotron RF System

• RF Power Source
• Operating Parameters of RF Power Amplifier

51
Proton Synchrotron Vacuum System

• 1 x 10-8 mbar
• Cross Section
• Plan view dipole chamber

52
Proton Synchrotron Vacuum System

• Selection of Material

• Metallic ?
• Epoxy resin or plastic ?
• Glass ?
• Ceramic ?

53
Proton Synchrotron Vacuum System

• Simulated pressure distribution in half unit
  cell

54
Proton Synchrotron Vacuum System

• Summary of Components

55
Proton Synchrotron Beam Diagnostics

• Components...
• Beam current transformers
• Beam position monitors
• Tune measurement system
• Moving wire scanner
• Faraday cups
• Beam loss monitoring system

56
Proton Synchrotron Target System

• Proton stopping length in the material used in
  the design.
• Neutron absorption has to be minimum so that more
  neutrons can penetrate through to the blanket
• Neutron distribution is axi-symmetric and as
  uniform as possible over the length of the core
  to simplify core management issues.
• Neutron spectrums to be appropriate to
  efficiently initiate a fission chain and drive a
  sub-critical assembly.
• To minimize beam power requirements the target
  needs to have high production efficiency.
• The yield gt25 neutrons per proton are suitable.

57
Calculated values of total leakage neutrons Y,
from various bare targets as a function of proton
energy. Sub 15 MeV neutron means that high energy
neutrons are not included. A cylindrical target,
10 cm in diameter and 32 cm in length is assumed
with a cylindrical proton beam profile of 4.7 cm
in diameter.
58
Proton Synchrotron Target System

• Parameters

59
Proton Synchrotron Building

• Linac and RF Equipment Gallery

60
Proton Synchrotron Building

• Proton Synchrotron

61

• Thank You!