absorber r&d and test results cm16 at ral, oct 8-11, 2006 shoji suzuki & shigeru ishimoto...
TRANSCRIPT
![Page 1: Absorber R&D and Test Results CM16 at RAL, Oct 8-11, 2006 Shoji Suzuki & Shigeru Ishimoto KEK](https://reader031.vdocuments.net/reader031/viewer/2022032308/56649cfa5503460f949ccbbe/html5/thumbnails/1.jpg)
Absorber R&D and Test Results
CM16 at RAL, Oct 8-11, 2006
Shoji Suzuki & Shigeru Ishimoto
KEK
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1) Absorber Test Cryostat
2) Instrument and DAQ
3) H2 Cooling Test Results
4) He Cooling Test Results
5) 20 L Absorber Cooling Test Results
6) Summary
OUTLINE
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Absorber Test Cryostat & Test Absorber
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LH2/He Level Sensor
KF40 + 48 pin Feedthrough
KF40 L=100
Extension Tube
CX-1050-SDX5
(serial)
CX-1050-SDX1 calibrated
(4 wires)
2 cm
2 cm
2 cm
2 cm
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1st stage
Heat Exchanger HEAT EXCHANGER ~60K
H2 or He GASINLET Cryocooler
Condenser
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Mini-Flange Test
Mini Rotation Flange Mini-Flange
S-S
Aluminum
KF16
1mm dia. Indium
KF Flanges + Helicoflex
Condenser
48 Pin
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Instrument and DAQ
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LakeShore 218S
Keithley 2700 DMM
Cernox x8
MKS 0-2000 Torr
Level #1-5
VAC. Gauge . . .
MONITOR (LabView)
LakeShore 218 Keithley 2700 DMM
Absorber DAQ System
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Wiring diagram of DAQ
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Software front panel for data-logger
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Software front panel for Cernox readout
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Software front panel for data-logger
Cernox LH2 level indication
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A part of software block diagram (data-logger)
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A part of software block diagram (Cernox readout)
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H2 Cooling Test
G-H2 was supplied to the Cryocooler from the 2 m3 tank at 1.3~1.0 atm.
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L-H2; 0.368 l/h (w/o) 0.973 l/hr
(MICE 20 l ; 57 hr 22 hr )
Improvement by the Heat Exchanger
2,000 l Tank
-0.193 l/hr ~1.7 W
0.973 l/hr
~8.6 W
COOLING STOP
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L-H2 Level Sensor Test
IN LIQUID(#2)
IN LIQUID(#1)
IN GAS(#5)
IN GAS(#4)
IN GAS(#3)
(#2)
(#1)
(#3)
(#4)
(#5)
48 PIN
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L-H2 Level Sensor Test
RTH
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L-H2 Level Sensor Test
RTH
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LHe Cooling Test
G-He was supplied to the Cryocooler directly from a cylinder at 1.4 atm.
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He ~3.7K
~ 0.6 atm
He ~4.6K
~ 1.4 atm
VAC; 10-7 ~10-8 Torr (No Leak)
LHe 4 K Leak Test
(Mini-Flanges and 48 Pin Feedthrough)
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LHe Condensation and Evaporation Speed
ID=4cm
2cm
2cm
LHe 1.5 atm; 0.207 l/h (MICE 20 l ; 97 hr)
48 PIN
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LHe Level Sensor Test
RTH
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Calibrated Cernox vs. LHe Vapor Pressure
dT=10 mK
He Condensation
~ 4.6 K (1.4 atm)
Tmin~ 3.7 K (0.6 atm)
CX-1050SD-1.4D
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Absorber Cooling Test 20 L Absorber was filled ~1.4 L L-H2.
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20 l Absorber cooling test at KEK
(1) Assemble*Level sensors at bottom, 2 Cernox and 1 PtCo on body*Lead wires pass through at the LH2 condenser *window seal; d=1 mm Indium (1 loop)*8 G10 (t=5) supports*MLI set; Al-Mylar 9x5 + Nylon Mesh x6 1 layer on windows and G10 supports 4 layers on body ~2 layers on flexible pipes.
(2) Vacuum and Leak Test*Leak at 300K disassemble found pinhole at a Helicoflex KF25 changed recovered*vacuum; 3 x 10^(-6) Torr after 3 days, 300K
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(3) Cooling Test #1 Sep-14, ‘06*cryocooler cooling 82 hrs; 300 20K *solid air blocking at the 1st stage heat exchanger
H2 impurity after 2 years operation for LH2 target
changed gas-H2 1.5 atm in the 2,000 L tank
(4) Cooling Test #2 (same assemble) Sep-22, ‘06*restart with LN2 pre-cooling
leak from N2 to vac. at ~200K stop LH2 filling*restart cryocooler w/o LN2 from 230K, takes 60 hrs from 230K to 20K*liquefied ~1.5 l H2 ( 1.5 0.9 atm 2,000 L tank)*measured H2 condensation and evaporation speed
20 l Absorber cooling test at KEK(continued)
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Temperature sensors inside 20 l Absorber
Level (5 Cernoxes)
Cernox calibrated
Cernox abs.1Cernox abs.2
& PtCo
LH2 outlet
LN2(LHe) inlet
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Level (5 Cernoxes)
5
4
3
2
1
Cernox calibrated
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Attachment for Cernox abs.2 & PtCo
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20 l Absorber assembled
LH2 inlet LH2 outlet
LN2(LHe) outlet
LN2(LHe) inlet
G10support
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20 l Absorber MLI wrapped
MLI --- 1 layerAl-Mylar 9x5 + Nylon Mesh x6
Window 1 layer
Body 4 layers
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CryocoolerTop flange
and warm bore
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20 l Absorber inserted to warm boreand piping
LN2(LHe) outlet
LH2 inletLN2(LHe) inlet
LH2 outlet
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Bottom view of H2
condenserLH2 supply LH2 return
LN2(LHe)return
LN2(LHe) supply
Kyocera 48 pin
From LH2 supply line (from Absorber)
To Bendix 18 pin
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Insert toVacuum Chamber
Pipes withMLI ~2 layers
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20 l Absorber H2 liquefaction test at KEK(LH2 1.425 l liquefied)
H2 Press. (Torr)
CX REF. 2nd.(ohm)
CX REF. 1st. (ohm)
CX0-calib. (K) *10
LH2 Temp_P. (K) *10
PtCo Abs. (K)*10
L-H2 in bodyL-H2 in pipe
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20 l Absorber H2 liquefaction test at KEK
LH2
GH2
<Question>
Level sensors In LH2
at same time?
G10 support was turned down?
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Cernox vs. H2-pressure
In LH2 Condenser
Temperature measurements by H2 pressure is possible
within error.
Cernox vs. H2-pressure
In Absorber
Temperature by H2 pressure
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Liquefaction and Vaporization of LH2 in 20 l Absorber
0.30 l / h , 2.6 W 1.33 l / h , 11.7 W
2000 l tank
Cooling stopLH2 1.43 l
68 hrs to fill 20 l
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(1) Cooling time (300K 20K)> 82 hrs by cryocooler only (not yet tested with LN2 pre-cooling)
Needs LN2 pre-cooling
(2) Condensation speed; 0.30 l / h , 2.6 W 68 hrs to fill 20L Needs better insulation to obtain shorter filling time
(3) Evaporation speed ~ heat leak; 1.33 l / h , 11.7 W (2)+(3) = 14.3 W ; net cooling power at absorber
LHe absorber required QL(heat leak) < 1.5 [email protected] LHe Absorber needs additional L-He supply ?
Summary 1/2(Absorber Cooling Test)
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(1) Cooling test with LN2 pre-cooling> Cold leak test and fix the LN2 channel> Open the window and check the level sensors repair if it needs> Add PtCo thermometer on the dummy bore and in the
condenser
(2) Improvement of absorber insulation> design G-10 support, MLI ....
* Until QL < 1.5 [email protected] for the LHe absorber, if possible ? * Larger cooling power margin makes shorter filling time and easier operation for the LH2 absorber.
Summary 2/2(Future Plan)
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Thank you