Transcript Diapositiva 1 - Istituto Nazionale di Fisica Nucleare

Solid state laser system
for the SPES RIB project
(classic and novel approaches)
Daniele Scarpa
INFN-LNL
SPES Target Group
Overview
-Introduction
- The SPES layout & devices
- TIS R&D activities
-Laser R&D activities
- Final remarks.
SPES Target Group
SPES Infra-structures Phases
Phase a
Cyc & ISOL
Facility
Phase b
Beam Selection &
Post Acceleration
Phase g d
Applications
Facility
50 x 50 m2
25 x 50 m2
Level 0
Level -1
Artistic View of the facility
SPES Target Group
The SPES main devices
Driver:
‘Commercial’ cyclotron
Production Target:
NEW CONCEPT
(Multi-foil UCx target)
Post Accelerator:
Piave- Alpi existing
complex
ALPI
RIB manipulation stage
- Mass Separator (WF)
- Beam Couler
- HRMS
- Charge Breeder
- RFQ
Target-Ion Source Complex:
- optimized for 8kW beam power
- Eproton = 40 MeV for RIB
- 1013 fission/s.
SPES Target Group
PIAVE
The TIS R&D activities
SPES Target Group
The TIS SPES Laboratories
HT LNL Lab
Carbide Chemistry LNL Lab
Test Bench LNL Lab
Laser PAVIA Lab
SPES Target Group
UCx Chemistry PADOVA Lab
New ‘class A’ LNL Lab
The SPES off-line Front end
40 kV platform
SPES Target Group
RIB ionization methods:
Selective method
Not extracted
Surface Ion source
Very selective method
Surface Ionization Method
1
H
3
Laser beam
Li
B
12
19
K
Ca
Cs
Plasma Ion source
39
56
88
Ra
22
Ti
Y
Ba
87
Sc
38
Rb Sr
55
21
V
57
Ac
41
72
104
Rf
25
42
73
Ta
105
74
W
106
Db Sg
26
Mn Fe
43
Nb Mo Tc
Hf
89
24
Cr
40
Zr
La
23
28
Co Ni
45
Re
107
76
46
77
Os Ir
108
78
Pt
109
29
30
Cu Zn
Ru Rh Pd
75
110
47
48
80
Au Hg Tl
111
14
49
15
P
32
112
Main fission (p-> 238U) fragments
81
Pb
83
Bi
Ne
Cl
Se
35
52
53
84
54
Xe
85
At
36
Kr
I
Po
18
Ar
Br
Te
10
17
34
51
82
F
S
Sb
9
16
33
50
Sn
8
O
Ga Ge As
Ag Cd In
79
7
N
Si
31
Bh Hs Mt
SPES Target Group
C
Al
27
44
6
13
Plasma Ionization Method
20
37
Fr
5
Be
Na Mg
nonselective method
He
Photo Ionization Method
4
11
Laser with SIS
2
86
Rn
Target and Ion Sources
> The Surface Ion Source (SIS) adopted for the SPES facility
support
ionizing cavity
plate
connector
thermal screen
Hot cavity:
- Optimized for Surface Ionization (Re inner surface)
- Optimized for Laser Ionization (Ta, naked)
SPES Target Group
Target and Ion Sources
> The Plasma Ion Source (PIS) adopted for the SPES facility
Starting configuration
Hybrid MK5 (CERN) – EBPIS (ORNL)
SPES Target Group
SPES ROAD MAP
1) Commissioning
2015: Delivery of infrastructure
2015-2016 Commissioning of subsystem
2) Operational-> 2017 : 40 MeV Cyclotron
- 2017 I = 5 μA,
- 2018 I= 50 μ A,
- 2019 I= 150 μ A,
UCx (13 mm) ;
SiC (40 mm full scale);
UCx (40 mm full scale);
SPES Target Group
(SIS) : Rb e Cs
(PIS-LIS): Al
(LIS):
Sn
Pavia Dye Laser Laboratory
Aluminum laser ionization
Two step, one color ionization path: Al [308.216;308.216 e−] Al+
Second step:
Non – resonant
towards
continuum
same wavelength
λ =308,216 nm
Typical transition linewidth
λ
λ
First step:
Resonant λ =308,216 nm
SPES Target Group
Combination of laser beam
For off-line facilities or where
typical laser system – hot cavity distance is ≈ 1-5 m
a possible solution: Fiber optics
Each laser enters in 200 um core fiber
+
SMA-SMA connection:
3 x 200 um into 1 x 600 um
Optical fiber 3 in 1:
optimal spatial overlap
Easy final alignment
Up to 1mJ in each 200um. fiber (pulse 15 ns.)
Bad final beam collimation (but ok for short distance)
SPES Target Group
WP03
Laser test at LNL with excimer
Aluminum ionization with a single wavelength
LPX200 XeCl
excimer laser
Pulse. 15 ns
λ=308 nm
Al photo
ionization
Laser beam
Hot Cavity
Laser beam
(phosphorescence
on plastic dump)
The laser beam shape is focalized into hot cavity
of 3 mm. diameter and 6 m. far away
SPES Target Group
Beam for SPES
According with the letters of intent
So far, 24 LoI’s received for reaccelerated RIB
SPES Target Group
SPES ROAD MAP
1) Commissioning
2015: Delivery of infrastructure
2015-2016 Commissioning of subsystem
2) Operational-> 2017 : 40 MeV Cyclotron
- 2017 I = 5 μA,
- 2018 I= 50 μ A,
- 2019 I= 150 μ A,
UCx (13 mm) ;
SiC (40 mm full scale);
UCx (40 mm full scale);
SPES Target Group
(SIS) : Rb e Cs
(PIS-LIS): Al
(LIS):
Sn
Tin in other facilities
Power and wavelength considerations:
λ
CERN
E(banco)[uJ] E(target)[uJ]
λ
OAK-RIDGE
E(banco)[uJ] E(target)[uJ]
λ
Leuven
E(banco)[uJ] E(target)[uJ]
E0
300,9
21
4,5
286,42
1
0
254,7
0
0
E1
811,4
85
15
811,62
150
0
454,9
0
0
E2
823,5
250
50
823,67
150
0
0
0
0
T Target
Frip
Distanza
Φ Target
2300 °C
10 kHz
15 m
3 mm
1700 °C
10 kHz
7m
3 mm
2000 °C
200 Hz
Contaminants considerations:
Hot cavity high temperatures provides high rates of contaminants at
first mass separator for 132Sn due to 132Cs.
=> Lower temperature for hot cavity
rephot
ratecavity materials
Doubling
=>Doubling
Engineering
(work functions)Doubling
(@
same pulse
ion current
efficiency
=> Higher
laserenergy)
repetition rate
SPES Target Group
Target and Ion Sources
> New Laser Ion Source Developments
Laser ionization system requirements:
Reference element: for Tin
Possible requirements:
Bandwith:
Base:
5 GHz (< 0,2 cm-1) ;
Narrow:
1 GHz (< 0,04 cm-1)
Energy per Pulse:
> 50 uJ (UV < 300 nm) ;
> 500uJ (fond)
Pulse duration:
20 < t < 30 ns
Freq Rip:
20 kHz
SPES Target Group
Target and Ion Sources
> New Laser Ion Source Developments
Laser ionization system requirements:
Reference element: Al
Possible requirements:
Bandwith:
Base:
5 GHz (< 0,2 cm-1) ;
Narrow:
1 GHz (< 0,04 cm-1)
Energy per Pulse:
> 50 uJ (UV < 300 nm) ;
> 500uJ (fond)
Pulse duration:
20 < t < 30 ns
Freq Rip:
20 kHz
SPES Target Group
Company custom proposal for SPES TiSa laser system
Master Oscillator + Power Amplifier (MOPA)
Ti:Sa tunable laser. Proposed specification.
Repetition rate:
20 kHz
Wavelength:
690 – 950 nm
Output energy:
0.5 mJ
Pulse duration:
15 ns
Pulse jitter:
<1 ns
Linewidth:
5-10 GHz
Narrow line option: 1 GHz
SPES Target Group
Company alternative proposal for SPES laser system
Master Oscillator + Power Amplifier (MOPA)
OPG Power Amplifier
In all cases where shorter pulses are accepted,
(range < 1 nsec), the OPG concept may represent a
valid practical approach: spectral properties are
defined by the narrow band low power seeder and
the beam quality is reasonably preserved by the
OPG stage.
SPES Target Group
Conclusion
SPES Target Group
Current status and overview
 Letter of Intents: under discussion to select first-day-exp.
 ISOL Target and Ion Source: working in off-line laboratory.
 Layout for pre-acceleration: defined.
 Authorizations ready for cyclotron operation.
 Contract for cyclotron: signed November ‘10, final design
accepted (June ’11), cyclotron under machining.
 Building project: ready, financed (June ‘12), bid on the way.
 Phase β and γ partially financed (July ‘12)
 Starting of Laser System R&D
 Expected ground breaking March 2013.
SPES Target Group
Meanwhile…..
New off-line laser lab in LNL under construction..
SPES Target Group
Meanwhile…..
New off-line laser lab in LNL under construction..
Estimated end of works: March ‘13
SPES Target Group
Laser R&D at LNL
- Beginning 2013:
- Build of a new off-line solid state laser lab in LNL
- 2013 – 2017:
- Measure and tests with solid state solutions at 20
kHz rep rate
- 2017:
- First SPES beam laser ionization on-line
SPES Target Group
Thank you!
SPES Target Group
Pavia Laser Laboratory Setup
Complete laser photoionization system structure
1 Pump Laser:
• Quanta System G.Y.L 101/102
 Nd:YAG laser
 Impulse Energy up to 300mJ
 Repetition rate max 10Hz
Since April 2010: the 3 tuneable laser are ON
3 Tuneable Dye Laser :
• Lambda Physik FL3002E and Lambda
Physik LPD3002E
 Bandwidth 0,2 cm-1
 Repetition rate according to pump
complete 3λ ionization scheme
SPES Target Group
Target and Ion Sources
> Possible Italian partner for laser system developments
Bright Solutions S.r.l was founded in 1998 by
group of laser scientists and industry experts with
significant experience in diode-pumped solid state
laser engineering.
From the origin the Company’s activity was
oriented towards the development of the state-ofthe-art DPSS laser sources with a goals of
superior efficiency, compactness and reliability.
SPES Target Group
Company custom products brief history
Possible portfolio baseline for SPES laser project
2010 CZMIL US Program
(Coastal Zone Mapping and Imaging Lidar)
Development of a custom laser source with 6mJ pulse
energy in 2ns (3 MW) at 10 kHz.
Two collinear laser beams, 35W at 532nm and 25W at
1064nm, are provided at laser output. The beam at
532nm detects the sea bottom, radiation at 1064nm
detects the sea surface.
Several rugged units have been delivered, accumulating hundreds of flight hours each.
2010 Widely Tunable
Ti:Sa
750-900 nm
10 kHz ; 10 ns
0.5 – 1 W
Application: In Vivo
Medical
Diagnostics
(University of Arkansas
for Medical Sciences).
SPES Target Group