The DM-Ice Test Detector

Transcription

The DM-Ice Test Detector
Detector Concept
Mechanical Assembly
Vessel Options
Logistics Considerations
Schedule
Karsten Heeger, Univ. of Wisconsin
UW, June 3, 2010
IceCube cable
DM-Ice Test Detector
IceCube cable breakout
Conceptual Overview
mechanical suspension
below DOM 60
breakout cable
15-20m
penetrator
stainless or titanium cylinder
height of the photopeak is used to derive the light output of
the system in photoelectrons per keV (pheikev).
main electronics boards for
reflector type
the surface of the lightguide was varied; the
2 ofPMTs
results are depicted in Figure 3.
HV boards
copper plate (2”?)
encap.
backfilled with nitrogen
silica
lightguide
(ijT0
cry~tsl
20cm
5” PMT
HV cable
Figure 2 System simulated for investigation
reflectance and reflector type
1.6
light guides
i
, , ,
1.4 .................
,
,
II
I
,
,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
:.......................................................
of lightguide
,
,
,
,
I
................
:
1
:.. .............. ::................
0-
Teflon mechanical supports
--internal.refbtieh
for
NAIAD crystals+light
0
.....................
guide+PMT
assembly
...ospeculai
,.2
NAIAD detector package
light guides
...............................
..i.....................
1
y
0.8
............... i.............. ..j.................. .................
0.6 -... .......
....................
0 diffuse i
5” PMT
HV cable
0.2
111. MONTE-CARLO
SIMULATION
UW, June
2010
A Monte-Carlo
(MC) 3,
code,
designated 'idlscintMC', has
been written and used to investigate light collection from
-
" " " " " " " " " " " "
75
Figure I: Proto-NAIAD rig.
1
.!.. ............................
0.4 . . . . . . . . . . . :~...........................................................................
,
no
85
90
95
IOD
retlectivity Of lightguide sulfate(%)
Figure 3: Results from MC investigation of lightguide reflectance
and reflector type (statistical error bars are hidden by plot
symbols).
ectrons per keV (pheikev).
NAIAD Detector
encap.
silica
lightguide
(ijT0
cry~tsl
Detectors
20cm
Figure 2 System simulated
investigation
of light
lightguide
existingfor
detectors
(PMTs,
guide,
reflectance and reflector
type from previous experiment, will
crystal)
1.6
i
, , ,
1.4 .................
,.2
1
0.8
,
be
retrieved
,
, ,
, , , from
,
, Boulby
,
, , ,mine
,
, in UK
July
II inIcmdiffusesfrlp
specu/arwilh
,
I
I
I
:.......................................................
................
:
1
will need to replace optical coupling
...............................
grease..i..................... :.. .............. ................
0::
--internal.refbtieh
y
will integrate detectors into new
housing
design0for
deployment
- ............... i..............
..j..................
.................
..................... with
IceCube strings 79 or 80.
0.6 -... .......
...ospeculai....................
0.4 . . . . . . . . . . . :~...........................................................................
0 diffuse i
0.2
1
.!.. ............................
-
" " " " " " " " " " " "
75
no
85
90
95
IOD
D rig.
FigureUW,
3: Results
from MC investigation of lightguide reflectance
June 3, 2010
•
design and integration effort in progress
•
model of simple housing scaled up from radio work
•
simple model of NAIAD detector
•
will model several options until we have design
decision
2 mainboards, 2 HV
Boards and
connections
Fig: Glen Gregerson
UW, June 3, 2010
Components
Weight
1 suspension system
???
1 or more penetrators + cable
???
2x mainboards
of
3.
2x HV boards
negligible
reflector type of the surface
results are depicted in Figure
encap.
the lightguide was varied; the
silica
lightguide
(ijT0
cry~tsl
copper shielding as required
~100 lbs
20cm
2x 5” PMTs ,
2x light guides
1 NAIAD
crystal
1.6
i
, , ,
1.4 .................
,.2
1
,
,
II
I
,
, ,
,
, ,
, ,
I
of lightguide
,
,
Icmdiffusesfrlp
specu/arwilh
:.......................................................
...............................
..i.....................
,
,
I
................
:
1
:.. .............. ::................
0-
--internal.refbtieh
0.6 -... .......
...ospeculai....................
.....................
0 diffuse i
111. MONTE-CARLO
SIMULATION
-
1 stainless or Ti pressure housing
~500-900 lbs for stainless
options
" " " " " " " " " " " "
75
A Monte-Carlo (MC) code, designated 'idlscintMC', has
typical crystal-lightguide-PMT systems, including protoNAIAD and a lOkg NAIAD module. The code can simulate the
random generation and propagation of photons through a
1
.!.. ............................
0.4 . . . . . . . . . . . :~...........................................................................
0.2
~20 lbs
y
............... i.............. ..j..................0 .................
0.8
,
no
85
90
95
IOD
symbols).
Comparing results for different types of reflection, one can
yields June 3, 2010
clearly see that specular reflection of 295% reflectivityUW,
greater light collection than total internal reflection, while
~325-585 lbs for Ti options
•
Suspension
– suspended from steel cables below DOM 60
– in addition or instead of weight stack at bottom of string
– weight may range from 500-1000 lbs based on design choice
•
Electrical Connections
– special device connector at breakout 30 above DOM 59
– 8pin + ground
– signal to be transmitted into ICL via surface junction box
– connect to dor card in ICL
UW, June 3, 2010
Test Detectors for Feasibility Study
• 2 identical detectors, strings 79 and 80
13
Figure 7:
Layout
ofofthe
full IceCube array showingUW,
location
the strings and IceTop tanks color coded by the
Karsten
Heeger,
Univ.
Wisconsin
June 3,of
2010
year of installation. Orange circles show the location of the planned string deployment for 2010/11 IceCube
DM-Ice Test Detector Housing
Options Under Consideration
Option C
“cylinder+DOM”
with mainboard waveform digitizer
Option A
“mushroom”
ht of the photopeak is used to derive the light output of
ystem in photoelectrons per keV (pheikev).
Option B
“straight cylinder”
reflector type ofheight
the surface
the lightguide
varied;the
thelight output of
of the of
photopeak
is usedwas
to derive
3.
results are depicted
in Figure
the system
in photoelectrons
per keV (pheikev).
encap.
reflector type of the surface of the lightguide was varied; the
silica
lightguide
(ijT0
cry~tsl
encap.
(ijT0
20cm
1.6
i
, , ,
1.4 .................
,
,
II
I
,
,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
:.......................................................
of lightguide
,
,
,
,
I
,
................
:
1
0.8
...............................
..i.....................
:.. .............. ::................
0-
--internal.refbtieh
y
0.6 -... .......
...ospeculai....................
0.4 . . . . . . . . . . . :~...........................................................................
0 diffuse i
0.2
e I: Proto-NAIAD rig.
111. MONTE-CARLO
SIMULATION
0.8
-
no
85
90
95
,
,
II
I
,
encap.
,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
:.......................................................
...............................
..i.....................
,
,
,
I: Proto-NAIAD rig.
Figure 3: ResultsFigure
from MC
investigation of lightguide reflectance
symbols).
111. MONTE-CARLO
SIMULATION
I
20cm
................
y
no
85
, , ,
0.8
90
95
,
,
II
I
,
,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
,
:.......................................................
...............................
..i.....................
:.. ..............
--internal.refbtieh
y
- ............... i.............. ..j..................0................
0.6 -... .......
-
...ospeculai....................
.!.. .....................
0.4 . . . . . . . . . . . :~.............................................................
0 diffuse
" " " " " " " " " " " "
75
i
1.4 .................
1
1
.!.. ............................
0.4 . . . . . . . . . . . :~...........................................................................
0.2
1.6
,.2
- ............... i.............. ..j..................0......................................
...ospeculai....................
(ijT0
,
:
0 diffuse i
IOD
,
silica
lightguide
cry~tsl
of lightguide
1
:.. .............. ::................
0-
--internal.refbtieh
0.6 -... .......
" " " " " " " " " " " "
75
,.2
1
.!.. ............................
i
, , ,
1.4 .................
1
- ............... i.............. ..j..................0......................................
reflector type of the surface of the lightguide w
20cm
1.6
1
,.2
silica
lightguide
cry~tsl
IOD
Figure
I: Proto-NAIAD
rig.
retlectivity
Of lightguide
sulfate(%)
Figure 3: Results from MC investigation
lightguide reflectance
111. ofMONTE-CARLO
SIMULATION
symbols).
Monte-Carlo (MC) code, designated 'idlscintMC', has
typical crystal-lightguide-PMT systems, including protowritten and used to investigate light collection from
NAIAD and a lOkg NAIAD module. The code can simulate the
and used
lightcancollection from
for different
typestoof investigate
reflection, one
Comparing been
resultswritten
al crystal-lightguide-PMT systems, including protofor
different
types ofand
reflection,
oneof can
Comparing
results
random
generation
propagation
photons through a
systems,yields
including protoclearly see thattypical
specularcrystal-lightguide-PMT
reflection of 295% reflectivity
cylindrically-symmetric
system. It canyields
model specular, internal
AD and a lOkgKarsten
NAIAD module.
The code can
simulate
clearly see that specular reflection
of 295% reflectivity
Heeger,
Univ.
oftheWisconsin
UW,
June
3,the2010
NAIAD and a lOkg NAIAD module. The
code can
simulate
and diffuse (using the Lamhertian model) reflectivities.
om generation and propagation of photons through a greater light collection than total internal reflection, while
random
generation
propagation
of photons through a greater light collection than total internal reflection, while
lightguides
resultand
in poor
light collection.
drically-symmetric system. It can model specular, internal diffuse-reflecting
diffuse-reflecting lightguides result in poor light collection.
0.2
" " " " " " " " " "
75
no
85
90
9
retlectivity Of lightguide sulfate(%
Figure 3: Results from MC investigation of lightgui
and reflector type (statistical error bars are hi
symbols).
Comparing results for different types of reflec
clearly see that specular reflection of 295% refle
greater light collection than total internal refl
diffuse-reflecting lightguides result in poor lig
However, several sources ([41,[5J) have reporte
increase in collection efficiency when a thin (-lc
specular lightguide is coated with diffuse reflector
•
Option A
“mushroom”
ht of the photopeak is used to derive the light output of
ystem in photoelectrons per keV (pheikev).
Mechanical Suspension
•
–
Attach to end of IceCube string below last DOM.
–
15-20m below end of string
–
Suspend from end of IceCube cable with stainless cable or chains
Electronics and Cabling
–
encap.
One special breakout cable from end of Icecube cable to DM-Ice
detector.
silica
lightguide
( i j–TOnly
0one penetrator into DM-Ice pressure vessel.
cry~tsl
20cm
–
of lightguide
Use IceCube
mainboard for waveform capture and HV board
1.6
i
, , ,
,
,
II
1.4 .................
,.2
1
0.8
I
,
,
,
–
,
, ,
, ,
•
,
,
,
I
..i.....................
–
................
1
.............. ::................
0-
y
Shield radioactive background of electronics from detectors with
0
.....................
copper plate
(~2”)
1
- ............... i.............. ..j..................
...ospeculai....................
,
:
:..
Housing
--internal.refbtieh
0.6 -... .......
I
:.......................................................
...............................
,
All
, HV is internal to pressure vessel.
Icmdiffusesfrlp
specu/arwilh
.................
.!.. ............................
–
Backfill
with
nitrogen for humidity and moisture control.
0 diffuse i
–
reduce diameter of long cylinder to save weight and material
–
No neutron detector, just NAIAD crystal
0.4 . . . . . . . . . . . :~...........................................................................
0.2
" " " " " " " " " " " "
75
e I: Proto-NAIAD rig.
111. MONTE-CARLO
SIMULATION
no
85
90
95
IOD
symbols).
Monte-Carlo (MC) code, designated 'idlscintMC', has
written and used to investigate light collection from
al crystal-lightguide-PMT systems, including protoAD and a lOkg NAIAD module. The code can simulate the clearly see that specular reflection of 295% reflectivity yields
through
om generationKarsten
and propagation
of photons
Heeger,
Univ.
of aWisconsin
UW, June
drically-symmetric system. It can model specular, internal diffuse-reflecting lightguides result in poor light collection.
However,
several sources ([41,[5J) have reported a resulting
iffuse (using the Lamhertian model) reflectivities.
3, 2010
Option B
he system in photoelectrons per keV (pheikev).
•
same considerations as Option A except straight
cylinder for ease of fabrication and simplicity
encap.
silica
lightguide
(ijT0
cry~tsl
20cm
1.6
•i
, , ,
1.4 .................
,.2
1
0.8
,
of lightguide
,
slightly
I
, heavier because of material used in
pressure housing
,
I
I
,
,
,
,
, ,
, ,
I
,
,
Icmdiffusesfrlp
specu/arwilh
:.......................................................
...............................
..i.....................
,
I
1
:.. .............. ::................
0-
--internal.refbtieh
y
- ............... i.............. ..j..................0......................................
0.6 -... .......
...ospeculai....................
0 diffuse i
0.2
-
" " " " " " " " " " " "
75
111. MONTE-CARLO
SIMULATION
1
.!.. ............................
0.4 . . . . . . . . . . . :~...........................................................................
,
................
:
no
85
90
95
IOD
symbols).
ypical crystal-lightguide-PMT systems, including protoclearly see that specular reflection of 295% reflectivity yields
NAIAD and aKarsten
lOkg NAIAD module.
The
code
can
simulate
the
Heeger, Univ. of Wisconsin
UW, June
andom generation and propagation of photons through a greater light collection than total internal reflection, while
cylindrically-symmetric system. It can model specular, internal diffuse-reflecting lightguides result in poor light collection.
3, 2010
•
Option C
“cylinder+DOM”
Mechanical Suspension
•
–
Attach to end of IceCube string below last DOM.
–
15-20m below end of string
–
Suspend from end of IceCube cable with stainless cable or chains
–
Use DOM sphere to house mainboards
–
One special breakout cable from end of Icecube cable to DOM
–
Multiple penetrators in and out of DOM sphere
encap.
silica
lightguide
( i j T 0–
cry~tsl
HV boards could be in DOM sphere (requires HV through
penetrator) or in detector cylinder
20cm
1.6
i
, , ,
1.4 .................
,.2
1
0.8
,
,
II
I
,
,
,
of lightguide
,
• , Housing
– Backfill with nitrogen for humidity and moisture control.
,
, ,
, ,
I
,
,
Icmdiffusesfrlp
specu/arwilh
:.......................................................
...............................
..i.....................
,
I
1
:.. .............. ::................
0-
--internal.refbtieh
y
–
- ............... i.............. ..j..................0......................................
0.6 -... .......
...ospeculai....................
0 diffuse i
0.2
–
111. MONTE-CARLO
SIMULATION
no
85
90
95
No neutron detector, just NAIAD crystal
IOD
symbols).
clearly see that specular reflection of 295% reflectivity yields
However, several sources ([41,[5J) have reported a resulting
increase in collection efficiency when a thin (-lcm) strip of a
specular lightguide is coated with diffuse reflector. The strip is
A . Inifial Light Collection Simulations
-
reduce diameter of detector cylinder to save weight and material
" " " " " " " " " " " "
75
cylindrically-symmetric system. It can model specular, internal
1
.!.. ............................
0.4 . . . . . . . . . . . :~...........................................................................
,
................
:
UW, June 3, 2010
Comparison
Option A
“mushroom”
height of the photopeak is used to derive the light output of reflector type of the surface of the lightguide was varied; the
height of the photopeak is used to derive the light output of reflector type of the surface of the lightguide was varied; the
in Figure
theresults
systemare
in depicted
photoelectrons
per 3.
keV (pheikev).
encap.
Option C
(“cylinder+DOM”
ijT0
silica
lightguide
encap.
(ijT0
cry~tsl
20cm
i
, , ,
1.4 .................
,
,
II
I
, ,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
:.......................................................
of lightguideFigure 2
System simulated for investigation
,.2
1
0.8
...............................
,
,
,
,
I
1.6
................
i
, , ,
1.4 .................
:
..i.....................
--internal.refbtieh
:.. .............. ::................
0-
,
,
II
I
,
,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
:.......................................................
...ospeculai....................
.!.. ............................
0 diffuse i
0.2
,.2
1
0.8
1
-
75
no
85
90
95
...............................
..i.....................
,
,
,
,
I
(ijT
,
20cm
Figure 2 System simulated for
................
:
...ospeculai....................
,.2
0 diffuse i
1
1
.!.. ............................
0.4 . . . . . . . . . . . :~...........................................................................
IOD
1.6
0.8
-
no
, , ,
,
,
II
I
85
90
95
..i...............
--internal.refbtieh
- ............... i.............. ..j..........
...ospeculai.................
0.4 . . . . . . . . . . . :~..............................
0.2
" " " " " "
75
no
85
retlectivity Of ligh
Figure 3: Results from MC investigati
and reflector type (statistical erro
symbols).
111. MONTE-CARLO
SIMULATION
Comparing results for different
clearly see that specular reflection
greater light collection than total
diffuse-reflecting lightguides resul
However, several sources ([41,[5J
increase in collection efficiency wh
specular lightguide is coated with d
believed to disrupt the formation of
photons within the lightguide. Ou
to agree with this result, and sugg
from specular reflecting lightguides
of a diffuse strip.
– compact mechanical design
– more feedthroughs and penetrators
– minimum number of feedthroughs and
penetrators
– multiple objects, handling possibly
more complicated
'
– ease of handling,
single object
,
IOD
Figure 3: Results from MC investigation of lightguide reflectanceand reflector type (statistical error bars are hidden by plot
and reflector
type (statistical error
bars are hidden by plotsymbols).
111. MONTE-CARLO
SIMULATION
111. MONTE-CARLO
SIMULATION
symbols).
A Monte-Carlo (MC) code, designated 'idlscintMC', has been written and used to investigate light collection from
been written and used to investigate light collection from typical crystal-lightguide-PMT systems, including protoComparing results for different types of reflection, one can
typical crystal-lightguide-PMT systems, including proto- NAIAD
lOkgspecular
NAIAD reflection
module. The
canreflectivity
simulate the
295%
yields
clearlyand
seea that
of code
greater
light collection than total internal reflection, while
NAIAD and a lOkg NAIAD module. The code can simulate the random
through while
a
and propagation
photonsreflection,
greatergeneration
light collection
than total ofinternal
random generation and propagation of photons through a cylindrically-symmetric
system. Itresult
can model
specular,
lightguides
in poor
light internal
collection.
cylindrically-symmetric system. It can model specular, internal anddiffuse-reflecting
diffuse (using the Lamhertian model) reflectivities.
increase in collection efficiency when a thin (-lcm) strip of specular
a
lightguide is coated with diffuse reflector. The strip is
A .specular
Inifial lightguide
Light Collection
is coated Simulations
with diffuse reflector. The strip is
believed to disrupt the formation of standing waves which trap
believed
to disrupt
the formation
of standing
which
Initial MC
simulations
investigated
the waves
influence
of trap
photons within the lightguide. Our MC investigations appear
Initial MC simulations investigated the influence of specific
MC collection.
investigations
appear
photons
within the
lightguide.
physical
properties
uponOur
light
These
to agree with this result, and suggest that the light collection
specific physical properties upon light collection. These included
to agree
withand
thismagnitude
result, and
that the light
collection
of from specular reflecting lightguides can be doubled through use
type
of suggest
surface reflectance,
shape
included type and magnitude of surface reflectance, shape of lightguide,
refractive
index lightguides
of lightguide,
of use
of a diffuse strip.
from specular
reflecting
canattenuation
be doubledlength
through
of crystal, crystal wrapping. Presented here
shape
lightguide, refractive index of lightguide, attenuation length of lightguide,
of a diffuse
strip.
2) Influence of lightguide shape
lightguide, shape of crystal, crystal wrapping. Presented here are a selection of the results from these simulations'
are a selection of the results from these simulations'
In this investigation a two-sided system consisting of a
I ) Influence of type and magnitude of lightguide reflectance
x 50mm encapsulated crystal coupled to two 75mm
In this investigation a two-sided system consisting of 50mm
a
simplecoupled
system,toshown
in phototubes by 95% specular reflecting air-filled lightguides
The MC
was used
to model acrystal
50mm
x 50mm
encapsulated
two 75mm
of specular
an encapsulated
NaI
crystal lightguides
75mm was simulated. The shapes of the lightguides were varied;
2 , consisting
phototubes
by 95%
reflecting
air-filled
The MC was used to model a simple system, shown in Figure
diameter
x
2Smm
height
coupled
to
a
75mm
flat
PMT
via
a
cylinders,
flared cones and tapered cones were modelled (see
Figure 2 , consisting of an encapsulated NaI crystal 75mm was simulated. The shapes of the lightguides were varied;
silicaand
lightguide.
The were
reflectance
and (see
Figure 4). The taperedcone half-angle 6 was also varied and
diameter x 2Smm height coupled to a 75mm flat PMT via a cylindrical
cylinders,200mm
flared cones
tapered cones
modelled
the effect upon light collection noted.
cylindrical 200mm silica lightguide. The reflectance and Figure 4). The taperedcone half-angle 6 was also varied and
Cylindrical lightguides and flared cones were found to yield
the The
effect
upon light
collection
noted. in the simulations
following
values
were assumed
similar collection efficiencies (within -2%) while tapered
described in this paper.
Refractive
index:cones
glasswere
1.55;
perspex
lightguides
and flared
found
to yield
The following values were assumed in the simulations 1.49; Cylindrical
mineral oil 1.47; Nal 1.85; silicone 1.40. Attenuation cones resulted in poor (-4 x worse) light collection (see Figure
similar
collection efficiencies (within -2%) while tapered
described in this paper. Refractive index: glass 1.55; perspex length:
glass 2m; perspex 4m; mineral oil 4m; NaI Im; silicone
5 ) . The variation of light collection with 6 can be explained
1.49; mineral oil 1.47; Nal 1.85; silicone 1.40. Attenuation 5m.
cones resulted in poor (-4 x worse) light collection (see Figure
length: glass 2m; perspex 4m; mineral oil 4m; NaI Im; silicone
5 ) . The variation of light collection with 6 can be explained
'
,
, ,
Icmdiffusesf
specu/arwi
:..............................
...............................
0.6 -... .......
" " " " " " " " " " " "
75
i
1.4 .................
y
- ............... i.............. ..j..................0......................................
0.6 -... .......
silica
lightguide
cry~tsl
:.. .............. ::................
0-
--internal.refbtieh
0.2
" " " " " " " " " " " "
encap.
1
y
0.4 . . . . . . . . . . . :~...........................................................................
,
- ............... i.............. ..j..................0......................................
0.6 -... .......
reflector type of the surface of the
of lightguide
1
Option B
20cm
1.6
silica
lightguide
cry~tsl
Initial MC simulations investigated the influence of
specific physical properties upon light collection. These
included type and magnitude of surface reflectance, shape of
lightguide, refractive index of lightguide, attenuation length of
lightguide, shape of crystal, crystal wrapping. Presented here
are a selection of the results from these simulations'
In this investigation a two-sid
50mm x 50mm encapsulated crys
The MC was used to model a simple system, shown in phototubes by 95% specular refl
Figure 2 , consisting of an encapsulated NaI crystal 75mm was simulated. The shapes of th
diameter x 2Smm height coupled to a 75mm flat PMT via a cylinders, flared cones and tapered
cylindrical 200mm silica lightguide. The reflectance and Figure 4). The taperedcone half-a
the effect upon light collection note
Cylindrical lightguides and flare
The following values were assumed in the simulations
described in this paper. Refractive index: glass 1.55; perspex similar collection efficiencies (w
1.49; mineral oil 1.47; Nal 1.85; silicone 1.40. Attenuation cones resulted in poor (-4 x worse)
length: glass 2m; perspex 4m; mineral oil 4m; NaI Im; silicone
5 ) . The variation of light collectio
'
– lightest option (370 lbs)
– heavier (tot weight 550-950 lbs)
5m.
149
5m.
149
Authorized licensed use limited to: University of Wisconsin. Downloaded on March 12,2010 at 13:56:23 EST from IEEE X
149
Authorized licensed use limited to: University of Wisconsin. Downloaded on March 12,2010 at 13:56:23 EST from IEEE Xplore. Restrictions apply.
Authorized licensed use limited to: University of Wisconsin. Downloaded on March 12,2010 at 13:56:23 EST from IEEE Xplore. Restrictions apply.
UW, June 3, 2010
with multichannel analyzer
encap.
silica
lightguide
(ijT0
cry~tsl
20cm
1.6
i
, , ,
1.4 .................
,.2
1
0.8
111. MONTE-CARLO
SIMULATION
I
,
,
,
,
, ,
Icmdiffusesfrlp
specu/arwilh
,
, ,
I
:.......................................................
..i.....................
,
,
,
,
I
,
................
:
1
:.. .............. ::................
0-
--internal.refbtieh
y
- ............... i.............. ..j..................0......................................
...ospeculai....................
0.4 . . . . . . . . . . . :~...........................................................................
0.2
1
.!.. ............................
0 diffuse i
-
" " " " " " " " " " " "
75
,
II
...............................
0.6 -... .......
•
,
of lightguide
no
85
90
95
IOD
–
One special breakout cable from end of Icecube cable to DM-Ice detector.
–
Only one penetrator into DM-Ice pressure vessel.
symbols).
specular lightguide is coated with diffuse reflector. The strip is
believed to disrupt the formation of standing waves which trap
Karsten
Heeger,
Univ.
of
Wisconsin
UW, June
Initial MC simulations investigated the influence of photons within the lightguide. Our MC investigations
appear
specific physical properties upon light collection. These to agree with this result, and suggest that the light collection
–
Use commercial MCA with modem for data taking and communication
3, 2010
Logistics of DM-Ice Detector
•
Shipment
– by air from Madison by Oct 22, 2010
– special shipping box, expected total weight ~ 800-1000 lbs per detector
– constrains on shipping box (pallet size)
•
Storage
– on surface, do not worry about cosmic activation for feasibility study
– temperature variations from +30 to -40 deg C OK
•
Pre-deployment tests at Pole
– unpacking from shipping box and visual inspection of outside
– suspend detector from lifting eyes or set up in stand
– HV electrical test and readout of detectorʼs PMT signal in test station
•
Handling at Pole
– forklift with boom for positioning
– frame or crate with wheels for easy of movement
– winch inside tents for pre-deployment tests and for deployment?
•
Anticipated deployment date
– Dec 15, 2010
UW, June 3, 2010
Special Equipment for DM-Ice Detector Deployment
•
Equipment Needs for Transport and Handling
– watertight shipping and storage box
– frame with wheels for handling and positioning
– boom for forklift?
– frame or winch in test tent for detector handling during pre-deployment
tests
– frame or winch in TOS for detector handling during deployment activities
•
Equipment Needs for Pre-Deployment Tests
– power supply
– DAQ
– computer setup at Pole
– can we use existing facilities for predeployment tests?
• ICL
• OML
UW, June 3, 2010
Logistics of DM-Ice Detector
•
Assumptions in planning transport and handling of detector for
feasibility study
– ensure mechanical integrity of detector
– maximize integration and testing time in Madison to minimize risk
of failure
– do not worry about cosmogenic activation during air shipment for
this feasibility study
– allow pre-deployment functionality tests at Pole
– minimize storage time on ice (as much as reasonably possible)
UW, June 3, 2010
Schedule Overview
Overview
22 weeks until shipment
design decisions
by end of June
ready for
integration in Sep
shipment by
Oct 22, 2010
UW, June 3, 2010
Schedule Details
Design Phase
to be completed by end of June
design decisions
by end of June
UW, June 3, 2010
Schedule Details
Procurement
FabricationPhase
July/August
ready for
integration in Sep
UW, June 3, 2010
Schedule Details
Integration Phase
September/October
shipment by
Oct 22, 2010
UW, June 3, 2010

The DM-Ice Test Detector

Transcription

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