Large-Acceptance Multi-Particle Spectrometer Samurai(7)

Large-Acceptance Multi-Particle Spectrometer Samurai(7)

Large-Acceptance Multi-Particle Spectrometer
Samurai(7)
Superconducting Analyser for Multi particles from RadioIsotope Beams
with 7Tm of bending power
Kobayashi T.
(Tohoku Univ.)
Contact person:
T. Kobayashi (Tohoku Univ.)
Collaborators:
K. Summerer (GSI)
T. Murakami (Kyoto Univ.)
T. Teranishi (Kyushu Univ.)
A. Tamii (Osaka Univ.)
J. Murata (Rikkyo University)
N. Aoi, S. Bishop, N.Fukuda, T. Gomi, T. Ichihara, K. Ikegami, T. Kubo, K. Kusaka,
T. Motobayashi, J. Ohnishi, T. Ohnishi, H. Okuno, H. Otsu, K. Sekiguchi, .
N. Sakamoto,
S. Takeuchi, K. Yoneda, Y. Yano (RIKEN)
T. Nakamura , Y. Satou (Tokyo Inst. of Technology)
T. Kawabata, Y. Maeda, K. Suda, H. Sakai, T. Uesaka, K. Yako (Univ. of Tokyo)
S. Kubono (CNS, Univ. of Tokyo)
T. Kajino (NAO, Univ. of Tokyo)
N. Chiga, N. Iwasa, H. Okamura (Tohoku Univ.)
[1] Physics Subjects
(1) Electromagnetic Dissociation (EMD)
with Invariant-mass method
virtual photon
(target)
(2) p,d,!-induced Scattering/Reaction
tagging
the decay of residual nucleus
p,d,! target
(missing-mass method)
(3) Polarized deuteron-induced Reaction
few-nucleon systems
polarized d beam
large momentum acceptance
(4) Multi Fragmentation
EOS studies
large magnetic volume
N>>Z
N<<Z
(with Invariant-mass method)
[2] Required Measurements
groups, range, accuracy
Target
H, !
"(Pb/U)
RI Beam
PID
Energy
position/direction
time-zero
Magnetic Field
Neutron
angle:
velocity:
efficiency:
[range]
±10o
0.62
±15%
>70% (1n)
Rmax/Rmin ~2-3
Proton
angle:
~several mrad
#$ /$ % 0.5%
＋multiple neutron
Light particle (p,d,!...)
"-ray
momentum:
[accuracy]
250MeV/A A/Z=3
Heavy Proj. Fragment
0.7GeV/c
±15%
±5o
#p/p < 1/100
momentum:
~few mrad
[range]
[accuracy]
angle:
charge:
velocity:
R<2.2 GeV/c
±few%
< fewo
< 50
0.62
#R/R < 1/700
#p/p < 1/1000 (d )
<few mrad
#Z ~ 0.2
#$ /$ ~ 10-3
[range]
[accuracy]
[2-1] Particle Identification (PID)
PID: mass A, charge(atomic number) Z
charge:
Z
energy loss:
dE dx " (Z !)
momentum (Magnetic Rigidity):
R=P/Z
magnetic analysis:
P Z " B#
velocity:
!
Time of Flight:
T "1 !
2
+additional limitation: Q=Z (fully stripped) + primary beam energy
RI beam energy: < 250 - 350 MeV/A
Mass number:
< 100
Mass identification
$A
A
$A
A
=
=
2
% 2 $!(
%$R (
'
* + '+
*
& R )
! )
&
0 .2
100
,
1
500
2
%$ (
+' Z *
& Z )
2
magnetic rigidity
velocity
or
energy
charge
$A
=
A
1
$R
R 700
$!
1
! 1100
1
$E
400
E
$ Z , 0. 2
2
2
2
% + $E (
%$R (
%$ (
'
* +' Z * +'
*
& R )
& Z )
&+ + 1 E )
@R = 2.2 GeV/c (A / Z = 3, 250MeV/A)
$ T , 50 psec @ L = 10 m
for Etot=30GeV (0.3GeV/A x 100)
! , 0.6
[2-2] Momentum Analysis
Matrix: A/Z=3, 250 MeV/A (2.2GeV/c)
D ) 2.0cm /%
D' ) 7.9mrad /%
( x ! ) ) 0.32cm /% (! ! ) ) 0.12
Deff = (! ! )D * (x ! )D' ) *2.3cm /%
Momentum Resolution:
2
(Xt,Yt)
2
2
& # ( x | !)
& # " (x ) &
# " p & # (! | ! )
T
exit window：
% ( =%
(
" (xD )( + %
" (x' D ) ( + %
D
p
D
D
$
'
'
'
$
$
'
$
eff
eff
eff
100-300µm Kapton+Kevlar
(Xd,Yd)
(!d,!d)
BL= 7 Tm
50deg bend
"(x D ) ) 0.3mm,
"(x' D ) ) 1mrad,
"(x T ) ) 0.5mm
"p
1
)
770
p
minimum requirements
2
[3] Magnet Design
method
Requirements
Experimental side
(1) Large field integral :
high precision momentum analysis
(2) Large magnet gap :
large vertical acceptance for neutrons
(3) No coil link :
large acceptance (space) in the horizontal direction
(4) Small fringing field :
detectors in the target region & tracking detectors
(5) Flexibility :
various experimental configuration
(6) Large momentum acceptance : heavy fragment & protons in coincidence
Built in vacuum chamber
Field cramp
Rotatable base
(Hole in return yoke)
(7) High Momentum resolution : <1/700 with broad-range spectrometer
<1/3000 for d-induced reactions
Q3D option
Magnet construction
(1) Simple structure :
(2) Cryostat similar to SRC :
proved/existing technology
(3) Utilize available superconductor :
reduce cost
(4) Utilize avalilable system :
TCF30 cryogenics
H-type superconducting magnet with round pole/coil (similar to HISS)
starting point : H-type round pole magnet w/o field cramp ~HISS (gap=1m)
Diam 2 m, Gap 0.8 m
3 T @3.6 MAT
28 MJ
7 Tm
~500 ton
~650 t(w/o coil link)
3
Field Map
B(13kG)
B(20kG)
B(25kG)
B(30kG)
2
Bz [T]
Pole:
Field:
Stored E:
BL:
Weight:
Vertical F.:
1
3.0m
Pole
0
1.2m
1.2m
0
Yoke
1
2
3
Radius [m]
0.8
6.2m
Fringing Field
0.6
B(13kG)
B(20kG)
B(25kG)
B(30kG)
0.8m 4.2m
0.8m
Bz [kG]
1.2m
0.4
0.2
2.1m
1.2m
0.0
-0.2
2
3
Radius [m]
4
Magnet Gap
Vertical Force [ton]
(1) Vertical force
(2) Expansion force
200 ton/m
self support possible
500
g=0.8m
g=0.6m
0
0.0
1.0
B [T]
2.0
3.0
no coil link
for large horizontal acceptance
(3) Utilize gap
built-in vac. chamber, by welding
cramp
coil
pole
0.8 m
±5o
Return Yoke Thickness
Fringing Field : Yoke thickness dep.
Weight
800
1.2 + !
700
B= 3.0T
Weight [ton]
600
500
400
300
200
100
0
0
+ 20cm
1.3m+!
Y
1.2m+!
10
20
30
Thickness [cm]
40
50
Field Cramp
Fringing Field : Field cramp thickness/height dep.
@B= 3.0T
Bz 0/0/0
Bz 25/50/660
Bz 50/50/660
800
600
600
no cramp
Bz [G]
Bz [G]
Bz 0/0/0
Bz 25/50/520
Bz 25/70/520
800
400
200
no cramp
400
200
T=25cm
T=25cm H=50cm
0
0
T=50cm
T=25cm H=70cm
200
250
300
R [cm]
350
400
200
250
300
R [cm]
T=25cm H=70cm
Cramp
Yoke
H
Coil
T
Bz < 30 G
350
400
Magnetic Field
@B= 3.0T
Mid plane (z=0)
Vertical pos.(z) dep.
4
3 10
3.5 10
xy=00 w/o cramp
xy=00 w/ w cramp
2.5 10
4
xy=0,0
xy=0,10
xy=0,20
xy=0,30
4
3 10
4
2.5 10
4
4
2 10
4
1.5 10
2 10
Bz [G]
B [G]
w/o cramp
4
w cramp
4
1 10
4
1 10
Cramp
Pole
5000
1.5 10
z=0cm
z=10cm
Cramp
z=20cm
4
5000
Yoke
0
z=30cm
0
-5000
0
50
100
150
200
250
300
0
50
Y [cm]
100
Y[cm]
Cramp
Yoke
Coil
40cm
150
200
Fringing Field : Bmax dep.
100
BL (2.0<Y<3.0)= 0.002 Tm @B=3.0T
!bend < 0.3 mrad
B=3.0T
B=2.5T
B=2.0T
B=1.3T
Bz [G]
50
0
-50
200
250
Position
detectors
300
Y [cm]
350
400
Spectrometer Magnet：
parameters
Pole:
2m diam., 0.8m gap
Field:
3 T @3.6 MAT
Turns/current:
396x2 turns / 4600 A
Field integral BL: 7 Tm
Stored energy:
28 MJ
Vertical force:
650ton
Weight:
611 ton +coil/cryostat
built-in vacuum chamber
6.6m
3.0m
Field Cramp
0.8m
Setup for (!,n) reaction
plan view
ZT=-4m
wall
Pit
Rotatable
base
Beamline
Triplet Q
neutron hodoscope
magnet
target
+10o
+5o
RI beam
Beam line
detectors
-5o
tracking
detector
Vacuum
chamber
-10o
-15o
TOF
-5m
0m
charged particles
250MeV/A
0o, ±2.5o, ±5o
5m
A/Z=1
A/Z=2
0.73GeV/c 1.45GeV/c
10m
A/Z=3
2.2GeV/c
15m
Setup for (!,n) reaction
side view
ZT=-4m
roof
wall
Beamline
Triplet Q
tracking
detector
target
neutron hodoscope
+5o
RI beam
Beam line
detectors
-5o
TOF
Rotatable
base
Pit
-5m
0m
5m
10m
15m
Experimental Setup : various Configurations
PPAC
neutron
detector
!
detector
PPAC
dc
H target
Si-strip
Pb target
IC
hod
proton
heavy
fragment
TPC
Q Triplet
H/He target
beam dump
dc
hod
p
"+
"-
d
dc
hod
dc
IC
hod
heavy
fragment
EOS measurement
Pol. d-induced reaction
PPAC
IC
dc
hod
heavy
fragment
polarimeter
proton
detector
proton
PPAC
!
detector
neutron
Pb target
(p,p'), (p,2p) etc.
(!,p) reaction: proton-rich side
(!,n) reaction: neutron-rich side
hod
IC
[4-1] Rigidity Analysis
(1) Basic setup
1 mrad (rms) angular resolution
(Xt,Yt)
vac. exit window
Downstream tracking detectors
PPAC
or
LP-KDC
(Xd,Yd)
(!d,!d)
●
good position resolution
" # 200µm
●
thin
L
$3
# 10
LR
●
large incident-angle variation
cell with rotational sym.
Drift chamber with hexagonal (square) cell
number of wires : minimum
field :
6-13mm
rotational symmetry
x 7.0
x 3.3
He-based gas mixture
low-mass / Z :
x 8.0
He+CH4
He+C2H6
reduce multiple Coulomb scattering
Ar+C2H6
Hexagonal D.C. (He+50%C2H6 @1atm)
Position Resolution
µ
Efficiency [%]
(1) Minimum Ionizing particles (µ)
Efficiency
4:6
9:1
6mm cell
HV [V]
(2) Heavy Ions @250-300MeV/A : 2MIPxZ2
200
200
150
z=9
Rms position resolution [ m]
100
50
0
100
150
z=5
z=7
z=13
Downstream D.C.
Hex DC (1 0. 5m m cell)
Hex DC ( 6m m cell)
z=17
Hex structure
xx'xx'xx'yy'yy'yy'
100
z=31
with shield planes
50
L
"4
(wire + window) ! 1.7 ×10
LR
0
100
z=17
80
L
"4
(gas25cm) ! 4 ×10
LR
60
z=5
Efficiency [%]
20
MIP
(beta)
z=9
z=7
60
40
z=31
80
z=13
multiplicity=1
mult iplicit y = 1
40
20
0
0
1
1.2
1.4
1.6
1.8
2
1
High Voltage [kV]
1.5
2
2.5
3
Possible improvements : Hexagonal D.C. at low pressure
(1) avoid thick exit window :
Kapton/Kevlar 200-300µmt (L/Lr~10-3)
operation in vacuum chamber
(2) reduce mass
gas(He+C2H6) > wire (average thickness) @1atm
(3) increase number of control parameters :
HV --> HV & pressure (gas gain & drift field)
Preliminary test for MIP with pure C2H6
100
80
Efficiency [%]
beam
vector
e_x2_700
e_x2_600
e_x2_500
e_x2_400
e_x2_300
e_x2_200
fragment
vector
vacuum
chamber
momentum
analysis
60
300torr
Beamline target
vacuum
700torr
40
z&A
identification
magnet
20
0
1.2
1.4
1.6
1.8
HV [KV]
2
2.2
2.4
2.6
vacuum
window
Rigidity Analysis
(2) Optional upstream detectors to improve momentum resolution
Ultra-thin detectors in vacuum
(MIP-sensitive)
(Xt,Yt)
(Xd,Yd)
(!d,!d)
Low-Pressure Cathode-Readout DC
7mm
P
A
5mm
vac. exit window
5mm
w - Kx - Ay - K - Ax - Ky -w
500
L/Lr=0.08x10-3
rms resolution [µm]
C2H6
250torr
i-C4H10
50torr
150torr
150torr
50torr
0
0.4
0.8
250torr
20torr
1.2
0.4
HV [KV]
0.8
1.2
300MeV/A Kr
[4-2] Particle Identification : velocity measurement
Total internal reflection Cherenkov
n(! )," (!)
n! =1 $
1
(n# )2
n = 1.4
n = 1.53
# th =
TAFD30(n=1.92) @250MeV/A
300
# th =
1
n 2 $1
200
2mmt TAFD30
1 mmt TAFD30
40Ar beam
150
A_peak [ch]
200
150
total
data
100
RI beam: Z=30-34
&E(Si)
250
A_peak [ch]
1
n
100
78Ge
76Ga
50
50
0
25
%/peak [%]
%/peak [%]
0
20
15
10
5
0
150
200
250
Ein [MeV/A]
300
350
Cherenkov ADC
20
15
10
5
0
100
150
200
250
Ein [MeV/A]
300
350
promising as non-stopping detector
[4-3] Particle Identification : total-energy measurement
!E [Si / Ion Chamber] + E [NaI(Tl)] with momentum tagging(~0.1%)
78Ge
z=34 83
Se
z=33
81As
"E
# 0.15% for
E
80As
!E(Si)
z=32
78Ge
z=31
76Ga
6390(14.5)
77Ge
77Ge
75Ga
6480(17.8)
TOF
NaI (Tl)
NaI (Tl) ADC
Problems :
non-uniformity / position dependence
PMT operated at very low HV
Covering large area :
NaI(Tl) : 37cm x 37cm x 5cm
viewed by 16 x 3"square PMT
CsI(Tl)+PD
78
Ge @290MeV/A
[4-4] Budget for tracking/PID detectors
(1) Beam tracking detectors :
7,080K JPY
2 x Cathode-readout DC (128mm x 128mm)
(2) Optional upstream tracking detectors :
9,620K JPY
2 x Cathode-readout DC (256mm x 256mm)
(3) Downstream chamber for heavy fragments :
58,800K JPY
2 x Hexagonal-cell DC (100cm x 60cm)
(4) Total-energy detectors :
7,000K JPY
NaI(Tl) (37cm x 37cm x 5cm) + 16PMT's
(5) Ion chamber
4,360K JPY
Segmented ion chamber (37cm x 37cm x 6 readout)
Man power
Kobayashi T, ChigaN
~87M JPY
2-3 graduate stufents (Tohoku Univ.)
Still need several detector R&D : scheduled in Dec. 2005 @HIMAC
Low-Pressure Hexagonal D.C.
NaI(Tl), CsI(Tl) for total-E measurement
[5] Neutron Detector NEBULA for (!,n)-type measurements
NEutron-detection system for Breakup of Unstable Nuclei with Large Acceptance
Invariant mass spectroscopy
by measuring core fragment + neutrons in coincidence
Giant Resonance (Soft Resonance, Pigmy resonance)
Low-lying discrete states at drip lines (1st 2+ state etc.)
Unbound ground states (25-28O, ‘4n’ etc.)
Features
Large acceptance (require a large gap of SAMURAI)
Good energy resolution
Multi-neutron detection
Flexibility of setup configuration
[5-2] Configuration
NEBULA
1 module :
12cm(H) x 12cm(D) x 180cm(H) plastic scintillator coupled to 2 PMT s
1 stack :
veto scintillators + 60 (30 x 2) modules
4 stacks :
~1m thick
4th stack
3rd stack
2nd stack
1s t stack
1.8m
3.6m
VETO
Scintillators
[5-1] Typical Setups
1n + core fragment
1-stack configuration
NEBULA
4n + core fragment
4-stack configuration
3.6m
~1m gap
10 m
[5-3] Acceptance
NEBULA
Acceptance is dictated by neutron
Basic setup :
Horizontal ±10o, Vertical ±5o
40%
1n acceptance
10MeV
2n acceptance
[5-4] Efficiency & Resolution
efficiency
NEBULA
resolution
~60%
~1m
12cmx12cm dimension is o.k.
In terms of the timing resolution
(for 2n separation, 6cmx6cm dimension
is significantly better than 12cmx12cm)
NEBULA
[5-5] Multi-neutron detection
Kinematical condition with the setup composed of spatially-separated stacks
➡　Nearly perfect rejection of crosstalk events
Need of veto for each stack:
for high energy neutrons > 200MeV,
to remove cross-talks from recoil protons
1s t stack
2nd stack
β1 ≤ β 2
Finite timing resolution ➡　ΔL should be about 1m for 12cmx12cm
(Non-distinguishable events ~ 2%)
(For 6cm x 6cm dimension
ΔL could be about 0.7m)
[5-6] NEBULA
Budget
Plastic scintillators
~100M JPY
Photomultiplier Tubes
~ 60M JPY
Electronics
~ 50M JPY
~210M JPY
Man Power
T.Nakamura, Y.Satou (Tokyo Inst. of Tech.)
K.Yoneda, T.Motobayashi (RIKEN)
Postdoc (1)
Ph.D Students (2)
[6] (!,p)-type measurement in the proton-rich side
Physics :
nuclear structure of proton unbound states in the proton-rich region
(!,p) radiative capture reactions for astrophysics
Method : Invariant mass method
via Coulomb dissociation,
proton-breakup reactions by p/d/" targets,
knockout reactions
Requirements :
Angular acceptance :
< ±60 mrad @Erel=1MeV
Momentum acceptance :
Pmax/Pmin ~ 2-3
Erel resolution :
0.1 MeV (rms) @1MeV
Angular resolution :
2 mrad
Momentum resolution :
0.5%
>
⇔
0.2% for mass identification
[6-1] High resolution mode
protons
DC+plastic
DC: 2m x 0.8m
(!,p)
A/Z=2
DC+IC+plastic
γdetectors
2×PPAC
γ
6×SSD
0.9m
4.5m
Si-Strip : XYU + XYU for protons & heavy ions
thickness :
100µm
pitch:
0.2mm
distance:
150mm
MCS:
1.7mrad(p), 1.0mrad(HI)
DC: 1m x 0.8m
[6-2] exclusive measurement mode
(!,p)
DC+plastic
protons
+ useful for (p,2pn)-type
- no mass separation
for A>30
A/Z=2
γdetectors
DC+IC+plastic
2×PPAC
γ
Decay ! tagging
DALI-II or GRAPE
Additionall device necessary for proton-rich side
RF deflector
6×SSD
4.0m
[6-3] Cost Estimate & Man power
(!,p)
Cost Estimate
(1) (RF deflector ):
(100M JPY)
(2) Si-strip detector :
15.8M JPY
(3) Drift Chamber for protons :
35M JPY
50.8M JPY
Man Power
Iwasa (Tohoku)
Suemmerer (GSI)
Bishop, Gomi, Motobayashi, Takeuchi, Yamada, Yoneda (RIKEN)
2-3 graduate students (Tohoku, Rikkyo)
[7] Pol. d Experiment
● pol. d beam : Ed = 500-880MeV
( pd = 1.4 GeV/c — 2.0 GeV/c)
● Physics Subjects :
Study of Three Nucleon Forces via Few Nucleon System
dp elastic/breakup reactions
dp →3He + ! radiative capture
Short-Range Part of the NN Tensor Interactions
3He(d,p)4He
● Observables :
Analyzing powers
Polarization transfer coefficients (double scattering measurement)
Spin correlation coefficients
Pol. d
[7-1] Experimental Conditions
3
dp → H e ＋ !
d" /d# ,Analyzing Powers
3
4
R eaction
dp elasticscattering
M easured O bservables
d" /d# ,Analyzing powers
d" /d# (c.m .)
〜 50m b/sr
〜10nb/sr
〜 5m b/sr
AngularR ange ($ c.m .)
160°− 180°
130°− 180°
0°− 1.6°
AngularR ange ($ lab .)
0°− 5°
0°− 7°
0°− 1°
H e(d ,p) H e
Spin correlationscoefficients
880 M eV (2.0 G eV/c)Polarized D euterons
Beam
t
t
3
Target
CH 2 (3m m )
Liq.H ydrogen (5m m )
Polarized H e gastarget
D etected Particles(D P)
proton
3
proton
K ineticEnergy ofD P
800 M eV
380 M eV 〜440 M eV
870 M eV
M om entum ofD P
〜 1.5 G eV/c
1.5 G eV/c 〜 1.6 G eV/c
〜 1.6 G eV/c
M om entum R atio : P beam /[P (D P)/Q ]
〜 1.4
2.4 〜 2.7
〜 1.3
M om entum R esolution p/% p
1600
600
1000
AngularR esolution (d $lab.)
0.5°
0.5°
0.5°
&E~1 MeV
to keep
reasonable S/N ratio
He
large solid angle
necessary
background rejection
Q1 : - 1.0 T
Q2 : - 1.1 T
Q3 : 1.3 T
SAMURAI : 3 T
• Dispersion
2.25 m
• Bending Angle
53.6°
• Magnification
(x|x)
(x|x) = ‐0.48, (y|y) = 15.7
• Angular acceptance
(
(h,v) = (±20 mrad,
mrad, ±90 mrad)
mrad)
• Momentum Resolution p/dp ∼ 3000
• Angular resolution dθ = 0.5 °
[including detector resolutions]
Detectors
MWDC
- Volume : 70cmW×120cmH×50cmD
(to cover Δp/p ±4%)
Plastic scintillator hodoscope
- Size : 70cmW×120cmH×1cmT, 2 layers
05.11.17
Beam Dump
Fe (40cmT) + Concrete Blocks
- Volume : 72 m3 (4mD×4.5mW×4mH)
- Movable & Rotary
Magnetic field is changed and a beam dump is
moved correspondingly to maintain the good
5
resolution at the focal plane.
[7-3] Other requirements
Pol. d
● beam line which connect between the RRC and SRC but skips the IRC
● beam monitoring devices for light ions (Z=1) at Big RIPS
● beam line polarimeter installed downstream of the SRC
● beam line polarimeter installed on the beam line which directly connect the RRC and the SRC
Schedule
FY2006
detector studies and R&Ds
FY2007
Construction ofbeam tuning devices
beam line polarimeter : detector & target system
and installation of beam dump at SAMUDAI
scattering chamber & target system for SAMURAI Q3D-mode
Polarized deuteron beam acceleration at RIBF
Calibration of deuteron beam-line polarimeter
dp elastic measurements with beam line polarimeter system
FY2008
dp breakup measurements with beam line polarimeter
Constuction of detector systems at SAMURAI
FY2009
Experiments at SAMURAI with polarized deuteron beams
Construction of focal plane polarimeter system at SAMURAI (upgrade)
[7-4] Budget
Pol. d
(1) Detectors @SAMURAI
1. MWDC :
10M JPY
2. Hodoscope :
4.8M JPY
3. Holder :
5M JPY
4. Electronics :
3.5M JPY
(2) Beam minitor
7.0M JPY
(3) Beam Dump
25M JPY
(4) chamber/target for Q3D
3M JPY
(5) Beam line polarimeter
5M JPY
64M JPY
[8] Time Projection Chamber (TPC) for EOS studies
Requirements for magnet
● large
magnetic volume :
● precise
TPC with 1.5m x 1.0m x 0.6m (similar to EOS TPC)
field map at B=1.5T
Requirements for TPC
● Detection
of p, !+, !- in the presence of projectile fragments &
intermediate-mass fragments (IMF)
● two-track
separation of 3.6cm for M=80
(12mm x 8mm) x 15360 pads : EOS TPC
● !+,
!- yield with 1% accuracy
p, !+ separation important
Required R&D
● mechanics
● pad
layout
of TPC vessel
detector performance
[9] Summary
1,000MY
75.5MY
11.4MY
210.MY
50.8MY
63.3MY
70.MY
1481MY
[10] remaining ...
(1) Magnet
still expensive
large ambiguity on cost estimate
large exit window + safety
field map measurement (?)
⇔
momentum resolution
new design ?
(2) Tracking & PID detectors
much progress last year :
OK for small prototypes
high-rate capability ?
total E detector
(3) Decay !-ray tagging for invariant mass spectroscopy
high-efficiency segmented detector
Readout electronics for MWPC/DC
high rate : ~ electronics with high gain
method1
method2
LRS2735 PC/DC
MWPC/DC
(Sasaki)PreAMP
conversion
card
Analog
ECL
20pair
twist
17pair
twist
+ 6V (6mA)
-12V (60mA)
MWPC/DC
method3
+5.0V (0.52A)
-5.2V (0.68A)
Vth (0-7.5V)
ATLAS ASD chip
LVDS
17pair
twist
64ch VME TDC
AMSC
+3V (0.28A)
-3V (0.07A)
Vth (<±0.6V)
CAMAC TDC
LRS4290
LRS3377
Readout electronics
100
2735 5V
PA+2735 5V
ASD80 0.5V
Efficiency [%]
80
LRS2735
PA + LRS2735
!-ray
ASD(80n/16n)
60
６角Cell
330V
x 21
40
20
0
Pulse Height [mV]
100
Pulse Height [mV]
X-ray
10
x 2 / 75V
1
1.2
1.4
1.6
1.8
HV [KV]
2
2.2
gain
x 20
low-power
LVDS
compact
stable
ASD :
2 types
X-ray signal
CF= 1pF
Sasaki(ATLAS) != 16 nsec
Tanimori != 80 nsec