hardware update - cires1.colorado.educires1.colorado.edu/jimenez-group/usrmtgs/usersmtg... ·...
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![Page 1: Hardware Update - cires1.colorado.educires1.colorado.edu/jimenez-group/UsrMtgs/UsersMtg... · Cryopump Temp Test 1 - Pump from vent condition Cryopump on from start Test 2 - Cryopump](https://reader035.vdocument.in/reader035/viewer/2022071605/614133d783382e045471ef32/html5/thumbnails/1.jpg)
Hardware Update
John Jayne5th AMS User’s Meeting
10/11/04
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Hardware • TOF – AMS• Light Scattering module• Short chamber• Beam Width Probe• High pressure lens for larger size particles• Rigid critical aperture holder • Cryopump• New Vaporizer…
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18 mm
450 mm
403 mm
378 mm
140 mmPivot point
Channel skimmer1 mm ID x 25.4 L
Channel aperture3.8mm ID x 20 mm L
Channel aperture3.8mm ID x 10 mm L
0.15”(3.8mm) OD Heater
Distances and Aperturesfor 255-xxx AMS Chamber
395 mm
178 mm
Chopper
353 mmBeam Probe
Aug. 2003
New chamber is 10 cm shorter, series 215-xxx
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Lens For larger particle transmission~0.3 – 3 umUnit: mm
d1=0.75 d2=0.65 d3=0.55 d4=0.45 d5=0.37 d6=0.31 d7=0.25
2.5
15
0.2
0.25
1.0
20D
10D
0.4
240
2
Sevenlenses
Sevenlenses
Freeflight
Targetplate
Particleinjection
Gasinlet
Schreiner at al. (1999) Zhang et al. (2002)
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VCO Style Critical Aperture
Holder
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The orientation of the pinhole is important
“Pimple” effect
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Possible Design for Improved Critical Aperture Holder
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Current HTP w/Critical Aperture and Valve Body
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Current Standard Lens w/Critical Aperture and Valve Body
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Ricor MicroStarTM Cryopumpfast pump out / background reduction in ARI Aerosol Mass
Spectrometer ionizer chamberhttp://www.ricor.com
•1000 Ls-1 pumping speed for water• 17 kg (38 lbs)• 400 Watts start-up at 50 VDC
(~200W normal load)
• Cryoshiled surrounds ionizer• Mounted between P5 (V301) and chamber
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Comparison of Mass Spec with and without Cryopump
102
103
104
105
106
107
Ion
Rat
e (H
z)
100908070605040302010AMU
Normal Background Background with Ricor Pump
120K
Water vapor drops ~15x; organics drop between 2 and 10x
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Ricor Microstar Cryopumpperformance in AMS
102
103
104
105
106
107
Ion
Sig
nal (
Hz)
6:20 PM9/18/2003
6:45 PM
dat
9:00 AM9/24/2003
10:00 AM
dat
400
350
300
250
200
150
100
50
Cryopum
p Temp, K
10:00 AM9/26/2003
12:00 PM
dat
Water (m18) Organic (m55+m57) Cryopump Temp
Test 1 - Pump from vent condition Cryopump on from start
Test 2 - Cryopump on after 4 days of 'normal' pumping
Test 4 - Ionizer off overnight, turbos on Cryopump on later
Ionizer on
Cryopump on
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Current Vaporizer Design
Nov. 17, 2000John Jayne
Scale 1" = .25"
Aerodyne Research, Inc.45 manning Road Billerica, MA 01821(978)663-9500 (x233)[email protected]
Note A
Notes:
A- Two heater leads.
B- make one heater using 80% dense molybdenum and one heater using 50% dense molybdenum (radius of curvature on cone angles < ~ .015)
One lead attached to ID of thermally isolating support
0.285" 0.150"
60 DegNote B
0.15
0"
0.400"
Thermally isolating support
Thermocouple
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30 Deg
0.137"
20 Deg
0.198"
40 Deg
0.084"
Oven Angle
1) 180 - 2) 3) 180 - 54) 5
N relative to beam axis
Specular reflectionsN incoming on beam axis
N 1st reflectionN 2nd reflection
N 3rd reflection5) 180 - 9N 4th reflection6) 9N 5th reflection
25 Deg
0.157"
0.15
0"
Minimum No. of Collisions length20 4 .19825 3 .15730 3 .13740 2 .084
Oven Angle
Cone Shaped Oven Heater Design to maximize partic le collisions and minimize cone length
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Particle trapping type vaporizer
Svane et al, 2004Pettersson Sweden
• Will effect temporal profile of vapor plume and resolution of particle size measurement.• Will be physically larger, or will reduce collection angle.• Temperature gradients…
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Digital interface for control electronics??
-eliminate toggle switches-enable data logging of pumps stats and vaporizer,
etc.-enable computer control of pumps, vaporizer,
chopper, etc.
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Discussion of hardware failures
Wire fatigue problem on chopper assembly
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Air Beam and Ionization Efficiency
• Ionization efficiency, IE (ions/molecule)– Sample a particle of known size (no. of
molecules) and measure the number of ions produced. Typically a few ions generated from 106 molecules.
• Air Beam, AB (Hz, ions / second)– The signal at N2 (or O2), use signal strength
as a measure of instrument sensitivity.Typically a few million ions per second.
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Variability in Ionization Efficiency and Air Beam
• Position of filament with respect to slit in ion reference region. IE/AB constant
• Multiplier collection efficiency. IE/AB constant• Pressure in TOF chamber (small internal leaks
can have a measurable effect on AB intensity). IE/AB larger
• Positioning of vaporizer inside ionizer volume IE/AB smaller
• Machining imperfections in skimmer channel. AB could be off-axis. IE/AB larger
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Summary of AMS Performance at Time of DeliveryHigh efficiency ionizer
High performance quad
12x106
8
4
0
Air B
eam (H
z)
Cal
tech
BC
-Lab
AR
I IU
MIS
TU
C-T
oohe
yS
UN
YA
SU
CE
HM
PI
AR
I II
U. T
okyo
UM
IST
Flig
htN
OA
AE
nv C
anU
C-J
imen
ezJu
lich
DO
E -
G1
NIE
SJC
AP
Uta
hU
MR
Wyo
mm
ing
Mai
nz S
ampl
ing
DO
E G
1S
AN
YU
JAR
IE
nvC
anII
Mai
nz-T
OF
UN
HN
OA
A P
ME
LC
U A
stro
Bio
TO
FA
RI T
OF
IIIN
OA
A-P
3
12x10-6
8
4
0
Ioni
zatio
n E
ffici
ency
2.0x10-12
1.5
1.0
0.5
0.0
IE/A
B
Cal
tech
BC
-Lab
AR
I IU
MIS
TU
C-T
oohe
yS
UN
YA
SU
CE
HM
PI
AR
I II
U. T
okyo
UM
IST
Flig
htN
OA
AE
nv C
anU
C-J
imen
ezJu
lich
DO
E -
G1
NIE
SJC
AP
Uta
hU
MR
Wyo
mm
ing
Mai
nz S
ampl
ing
DO
E G
1S
AN
YU
JAR
IE
nvC
anII
Mai
nz-T
OF
UN
HN
OA
A P
ME
LC
U A
stro
Bio
TO
FA
RI T
OF
IIIN
OA
A-P
3
Group
Average Value = 0.77(+/-0.30) x 10-12
AMS_PerformanceSummary
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CH3O+ = 31
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Converging nozzle to improve collection of micron size particles
A fabrication challenge…
•Two nozzles have been made (not quite to spec).• Measurement results not as expected, no improvement in large particle transmission
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Adjustable Inlet with Micrometer heads