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January 5, 2004S. A. Pande - CAT-KEK School on SNS
1
100 MeV Injector Linac forIndian Spallation Neutron
Source
S. A. PANDE
The Spallation Neutron Source
Ion Source RFQ Linac
1 GeV Proton
Synchrotron
Spallation target
50 keV 4.5 MeV 100 MeV
January 5, 2004S. A. Pande - CAT-KEK School on SNS
3
Synchrotron Parameters
Injection energy 100 MeVExtraction energy 1.0 GeVCircumference 212.4 mRadio Frequency 1.21 – 2.47 MHzRepetition rate 25 HzBeam power 100 kWNo of protons/pulse 2.5x1013
January 5, 2004S. A. Pande - CAT-KEK School on SNS
4
Requirements From Injector Linac
Output energy 100 MeVParticles H–
Pulse current 20 maPulse length 500 sRepetition rate 25 Hz
January 5, 2004S. A. Pande - CAT-KEK School on SNS
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Layout of the Linac
Ion Source
LEBT & Chopper
RFQ MEBT DTL
HEBT + Long. & Trans. Phase Space Painting
1 GeV
Proton
Synchrotron
50 keV 4.5 MeV 100 MeV
January 5, 2004S. A. Pande - CAT-KEK School on SNS
6
Low Energy Beam Transport (LEBT) Required for the following.• Phase space matching of the beam
from ion source to RFQ• Putting diagnostics after the ion
source• Vacuum pumping provision• Additionally, LEBT will house the
chopping system in our case
January 5, 2004S. A. Pande - CAT-KEK School on SNS
7
The Chopper System Why it is required to chop the beam?• The 500 sec beam pulse will be
sufficient to wrap ~302 times around the synchrotron
• With harmonic no.(h)= 2, there will be 2 RF buckets.
Bucket heightE
Synch. RF Period
January 5, 2004S. A. Pande - CAT-KEK School on SNS
8
The Chopper (Contd.)
• The RF bucket height decreases at the ends (shown by yellow circles in the last slide) and particles falling in these regions will be lost
• These lost particles form a considerable amount of the injected beam (at 100 MeV!)
• Why not stop this beam being injected into the synchrotron or in the linac itself.
January 5, 2004S. A. Pande - CAT-KEK School on SNS
9
Chopper (Contd.)
• This is done using the chopper system
• The chopper will be an electrostatic deflector assembly sweeping the beam across a circular aperture
• ~34% of the beam will be stopped and 66% will be transmitted through the linac
January 5, 2004S. A. Pande - CAT-KEK School on SNS
10
The Chopper (Contd.)
Synch. RF Period
Injected InjectedChopped
120 of RF Period
January 5, 2004S. A. Pande - CAT-KEK School on SNS
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Radio Frequency Quadrupole (RFQ)
Choice of Parameters – main considerations
January 5, 2004S. A. Pande - CAT-KEK School on SNS
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Choice of Parameters - RFQ
Main considerations will be- To control the emittance growth Less power loss in the structure to enable
efficient removal of heat Higher transmission efficiency to reduce
the risk of structure activationChoice of Structure
Higher efficiency, simplicity in heat removal
Four Vane Cavity Structure
January 5, 2004S. A. Pande - CAT-KEK School on SNS
13
Input/output Energy
Input energy can be anywhere from 30 to 100 keV
Higher output energy is preferred from injection point of view in the following accelerator
The RFQ output energy range from 3 MeV to 7 MeV for similar projects around the world
The output energy chosen is 4.5 MeV
January 5, 2004S. A. Pande - CAT-KEK School on SNS
14
The Design Frequency
Major factor – Availability RF Power Source Higher power conversion efficiency f1/2
Choice of higher frequency Dimensional tolerances f-1/2
Power dissipation capability of the accelerator structure f-1
Choice of lower frequencyConsidering CW operating mode, machining andalignment tolerances, we chose f = 350 MHz
January 5, 2004S. A. Pande - CAT-KEK School on SNS
15
Inter-vane Voltage Higher inter-vane voltage preferred for
Better transverse focusing and better beam characteristicsBetter transmission efficiencyHigher acceleration efficiency & in turn shorter accelerator length
Lower inter-voltage is preferred forLower power loss in the structureLess probability of sparking
January 5, 2004S. A. Pande - CAT-KEK School on SNS
16
Inter-vane Voltage (Contd.)Power dissipation in the structure V2
Acceleration or energy gain V Being a CW accelerator, the last point is
of crucial importance. The inter-vane voltage between 65-90 kV
should be a good choice.We generated RFQ designs withInter-voltages of 65, 70, 75, 80 and 85 kVThe design with 65 kV is selected
January 5, 2004S. A. Pande - CAT-KEK School on SNS
17
Radio Frequency Quadrupole (RFQ) Frequency 350 MHz Energy 4.5 MeV Beam current 25 mA Inter vane voltage 65 kV Particle H+/H– Total length 6.52 m Transmission efficiency 96.3 % Total power loss(structure) 428 kW Beam power 111.25 kW Max. surface E field (Emax) 26 MV/m Kilpatrick 1.4
January 5, 2004S. A. Pande - CAT-KEK School on SNS
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RFQ – Design Parameters Modulation Parameter (m) 1 – 1.915 Average radius (r0) 3.30 mm
Synchronous phase (s) -90 - -30 Transmission efficiency () 96.3 % Input emitt. t,rms(n) 0.20 m.rad
Output emitt. t,rms(n) 0.20 m.rad
Output emitt. z,rms(n) 0.10 deg.MeV
Quality factor (Q0) 9000
January 5, 2004S. A. Pande - CAT-KEK School on SNS
19
RFQ – Design Parameters
Modulation Parameter (m) 1 – 1.915 Average radius (r0) 3.30 mm
Synchronous phase (s) -90 - -30 Transmission efficiency () 96.3 % Input emitt. t,rms(n) 0.20 m.rad
Output emitt. t,rms(n) 0.20 m.rad
Output emitt. z,rms(n) 0.10 deg.MeV
Quality factor (Q0) 9000
January 5, 2004S. A. Pande - CAT-KEK School on SNS
20
RFQ Cavity Characteristics
Four vane structure Transverse cross
section optimized with SUPERFISH
Power loss = 656 W/cm Power density 6 W/cm2
3D Study with MAFIA is in progress to decide about joining the multiple sections.
January 5, 2004S. A. Pande - CAT-KEK School on SNS
21
100 MeV DTL as injector for SNS DTL is designed for 50 mA with a view to
inject more current into synchrotron with increased injection energy.
A 50 mA RFQ is redesigned with 85 kV intervane voltage, Length = 5.5 m.
Beam dynamics design is performed with PARMILA.
Beam available from RFQ is traced through DTL
MEBT design and matching through DTL is studied with TRACE3D
January 5, 2004S. A. Pande - CAT-KEK School on SNS
22
Matched beam through DTL
10.000 mm X 50.000 mrad
30.000 Deg X 300.00 keV
10.000 mm X 50.000 mrad
30.000 Deg X 300.00 keV
NP2= 1670
10.00 mm (Horiz) 30.0 Deg (Long.)
10.00 mm (Vert)
NP1= 1
Length= 74150.16mm
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H A= -1.2875 B= 0.13660 V A= 1.6027 B= 0.18408
Z A= 3.95600E-02 B= 0.45346
BEAM AT NEL1= 1
H A=-1.38384E-03 B= 0.87687 V A=-1.25605E-03 B= 1.7475
Z A=-2.31389E-02 B= 3.32246E-02
BEAM AT NEL2= 1669 I= 50.0mA W= 4.5000 100.4984 MeV
FREQ= 350.00MHz WL= 856.55mm EMITI= 22.620 22.420 1167.00 EMITO= 4.669 4.628 1167.18
N1= 1 N2= 1669 PRINTOUT VALUES PP PE VALUEMATCHING TYPE = 8
DESIRED VALUES (BEAMF) alpha beta x 0.0004 1.6142 y 0.0005 0.8072 MATCH VARIABLES (NC=4)
MPP MPE VALUE 1 1496 39.92440 1 1501 -39.74996 1 1504 39.73440 1 1509 -39.89799
CODE: TRACE3D v67LY FILE: nd50-12.t3d DATE: 01/19/2004 TIME: 00:17:06
January 5, 2004S. A. Pande - CAT-KEK School on SNS
23
Beam transmission through DTL*** 100 MeV 350 MHz DTL AS INJECTOR FOR INDIAN SNS ***
-1.0
0.
1.0
-13 125 262 400
x (cm) vs. cell no.
-1.0
0.
1.0
-13 125 262 400
y (cm) vs. cell no.
-1.0
0.
1.0
-13 125 262 400
w-ws (MeV) vs. cell no.
100 MeV DTL - Parameters Energy 100 MeV Beam current 50 mA Average E0 1.8 – 2.2 MV/mm Synchronous phase -60 – -30 Length 74 meters Number of Tanks 7 Tank diameter 52 – 50 – 48 cm Total power 6.76 MW Focussing lattice FODO Input Tr (n,rms) 0.2 mm mrad
Output Tr (n, rms) 0.28 mm mrad
Long (n, rms) 0.197 deg.MeV Energy spread (100%) 450 keV Phase spread (100%)16.6 rms radius at O/P 1.27 mm
January 5, 2004S. A. Pande - CAT-KEK School on SNS
25
Beam at the Output*** 100 MeV 350 MHz DTL AS INJECTOR FOR INDIAN SNS ***
ncell = 327 plot#= 343 Zposition= 7400.961
-.015
-.008
0.
.008
.015
-1.000 -.500 0. .500 1.000Xp vs. X -.015
-.008
0.
.008
.015
-1.000 -.500 0. .500 1.000Yp vs. Y
ngood= 9607
-1.000
-.500
0.
.500
1.000
-1.000 -.500 0. .500 1.000Y vs. X -1.000
-.500
0.
.500
1.000
-90.0 -45.0 0. 45.0 90.0E-Es vs. Phi-Phis
Es= 100.498 Ps=-30.0