1. VELO Thermal Control System
(VTCS)
Tertiary System Layout at VELO
VTCS Left Local Control Box
Test-Connection
Tertiary vacuum
Secondary vacuum
TL-VL06
TL-VL03
Vapor mixture return
Insulated concentric tube
TL-BD01
TL-PT01
TL-PT02
TL-FL2
Liquid in
(45)
(47)
Left
TL-VL01
TL-BD02
(46)
TL-FL1
TL-VL02
TL-VL04
TL-HX28
(48)
TL-PT03
TL-PT08
TL-VL07
TL-VL05
TL-VL09
TL-PT04
TL-HX1
(01) = Tx-TT01
(02) = Tx-TT02 ……
(48) = Tx-TT48
Temperature sensor labeling:
Primary vacuum
Shielding wall
Secondary Vacuum
TL-BD03
TRL-VL01
Left Tertiary vacuum control
TL-HX27
TRL-VL02
Right Tertiary vacuum control
TR-HX1
TR-HX27
TR-PT04
50 meter
TR-VL09
Secondary Vacuum
TR-BD03
TR-BD02
TR-PT03
TR-VL05
TR-VL07
Vapor mixture return
(48)
TR-HX28
TR-VL08
TR-BD01
TR-PT01
TR-PT02
TR-VL04
Right
Liquid in
(45)
(47)
TR-VL01
TR-FL1
(46)
Insulated concentric tube
TR-VL02
TR-FL2
VTCS Right Local Control Box
TR-VL06
TR-VL03
VELO Detector
Test-Connection

2. Tertiary Vacuum Control
8 x 50 pins Electrical
Vacuum feed through connectors
VTCS sensor and actuator overview per VELO half
Tx-FL01
(47)
Tertiary vacuum
(36)
(48)
Tx-BD03
4x Mounting Board (Capacity = 20x PT100 & 2x Heater (2A) per board
(34)
Tx-PT02
(33)
Tx-PT04
Tertiary Vacuum Control
(35)
Local Control Box
Tx-PT03
Heater group Tx-HT01 (6x Watlow K010030c500000)
Heater group Tx-HT03 (6x Watlow K010030c500000)
Tx-VL02
Tx-VL09
(91)
(93)
(37,87)
(39,89)
(46)
Tx-PT01
(41)
CO2 in
and outlet
Tertiary vacuum connection to secondary vacuum
(42)
(45)
(38,88)
(40,90)
Electrical Connector
Type: 6 pin LEMO (FGG.OB.306.CLAD52)
(92)
Heater group Tx-HT02 (6x Watlow K010030c500000)
Heater group Tx-HT04 (6x Watlow K010030c500000)
(94)
(04)
(01)
(18)
(15)
(32)
(29)
Electrical
Bulkhead Connector Type: 6 pin LEMO (EEG.OB.306.CLL)
(02)
(16)
(30)
(07)
(08)
(09)
(10)
(11)
(12)
(13)
(14)
(17)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
(28)
(31)
(01) = Tx-TT01
(02) = Tx-TT02 ……
(48) = Tx-TT48
Temperature sensor labeling:
(03)
(05)
(06)
TL-HX1
TL-HX2
TL-HX3
TL-HX4
TL-HX5
TL-HX6
TL-HX7
TL-HX8
TL-HX9
TL-HX10
TL-HX11
TL-HX12
TL-HX13
TL-HX14
TL-HX15
TL-HX16
TL-HX17
TL-HX18
TL-HX19
TL-HX20
TL-HX21
TL-HX22
TL-HX23
TL-HX24
TL-HX25
TL-HX26
TL-HX27
(43)
(44)
Tx = TL for left detector half and TR for right detector half

3. Acronyms bverlaat@nikhef.nl
Px- = Primary Cooling System (6-12°C Water)
Sx- = Secondary Cooling system (R404a chiller)
SA = Secondairy A
SB = Secondairy B
Tx- = Tertiary Cooling System (CO2 system)
TL = Tertiary Left
TR = Tertiary Right
AC = Accumulator
PT = Pressure Transmitter
BD = Burst Disc
HX = Heat Exchanger
HT = Heater
FT = Flow Transmitter
LT = Liquid Level Transmitter
TT = Temperature Transmitter
FL = Filter
PM = Pump
VL = Valve
HPL = High Pressure Liquid
LPG = Low Pressure Gas
SLV = Saturated Liquid Vapor Mixture

4. VTCS control integration for 1 VELO half
Cooling connector
Connector onto Evaporator
Evaporator
Outdoor T-sensors
to dummy rep. board
Heater repeater board 2
Cooling repeater board 1
VTCS local control box
Tertiary vacuum control
2x3 P-sensors
2x12 T-sensors
Evaporator into Module base
Evaporator sensors to connector board
2x4 Heaters
2x36 T-sensors
Heaters and T-sensors to connector board
Module base
Cooling plant and control on RB-84 platform
T-sensor signal wires
P-sensor signal wires
Heater power wires
Installation direction
Connection to bake-out control
RF-Box

5. VTCS Schematic at VELO VELO Cave (View from tunnel) bverlaat@nikhef.nl
Concentric Transfer tube
VTCS Local control boxes
VTCS Sensor boards
(Dummy repeater)
Removable tubing
Left Evaporator Connection
Right Evaporator Connection
Left Detector
Right Detector
Tertiary Vacuum Control

6. VTCS Cabling logic at VELO
4x P-sensors TxPT01-TxPT04
4x Shielded cables 6 wire
SCEM
Direct on P-sensor
(Rigth half shown seen from LHCb into tunnel)
VTCS Local Control Box
Heater Repeater Board
4x Heater TxHT01-TxHT04
4x Shielded cables 4 wire
SCEM
4x 2 pin (2A) connector on R-Bd
4x T-Sensor
TxTT45-TxTT48
1x shielded cable 16 wire
SCEM??????????
1x 16 pin connector on R-Board
12x T-sensors TxTT37-TxTT48
1x Shielded cables 50 wire
SCEM
1x 50 pin connector on R-Board
4x HeaterTxHT01-TxHT04
Via kapton cable
8x T-Sensor TxTT37-TxTT44
Via kapton cable
36x T-Sensor TxTT01-TxTT36
Via kapton cable
Cooling repeater Board
VTCS Cabling logic at VELO
36x T-sensors TxTT01-TxTT36
3x Shielded cables 50 wire
SCEM
3x 50 pin connector on R-board
Quantities for 1 detector half
T-sensor signal wires
P-sensor signal wires
Heater power wires

7. INTERFACE BOARD LAYOUT

8. Right Detector half bverlaat@nikhef.nl Cooling Repeater
Heater Repeater

9. Temperature sensors on evaporator

10. Finished evaporator with cabling

11. Evaporator Cabling details

12. Evaporator Sensor Locations

13. Evaporator Slow Control
Evaporator Temperature sensor cabling situation in side the secondary vacuum
Evaporator Slow Control

14. bverlaat@nikhef.nl Cooling connectors Flexible in and outlet lines
Capillary and
T-Sensor channel
PT100 cables
PT100 Interface board
Vapor outlet
Cooling vacuum feed trough
Liquid inlet
Evaporator Slow Control

15. bverlaat@nikhef.nl Details behind kapton flat cables Cooling repeater
Evaporator Slow Control

16. Specific Sensor Functions
Sensor TT36 Dew-point monitoring
Sensor TT33/34 2-phase return monitoring
Specific Sensor Functions
Sensor TT(3,5-14,17,19-28,31) Dry-out control
Evaporator Slow Control

17. Evaporator Slow Control Interface Board Layout
Cable 4 longest
Cable 3
Cable 2
Cable 1 Shortest
TT30
TT25
Free
TT35
TT10
TT05
TT20
TT15
TT29
TT24
Free
TT34
TT09
TT04
TT19
TT14
TT28
TT23
Free
TT33
TT08
TT03
TT18
TT13
TT27
TT22
Free
TT32
TT07
TT02
TT17
TT12
TT26
TT21
TT36
TT31
TT06
TT01
TT16
TT11
Free
Free
Free
Free
Evaporator Slow Control

18. Evaporator Slow Control
PT100 Cable lengths
Cable lengths are from TT sensor to soldering patch on interface board. Over length is included
All shown lengths are similar for the left and right detector. Shown are the sensors of 1 detector half. Every sensor need to be fabricated 2 times.
Sensor ID TT37 – TT48, will be cut to length when assembled. Pre made length for all will be 1500 mm
Evaporator Slow Control

19. bverlaat@nikhef.nl Code Part number Functionality
Temperature range (°C)
Function
TR-TT01
PT100
TL-HX01
Liquid inlet
-50 / 40
Educational
TR-TT02
block 1
TR-TT03
Dry-out monitoring
Monitoring
TR-TT04
Vapor outlet
TR-TT05
TL-HX02
TR-TT06
TL-HX03
TR-TT07
TL-HX04
TR-TT08
TL-HX05
TR-TT09
TL-HX06
TR-TT10
TL-HX07
TR-TT11
TL-HX08
TR-TT12
TL-HX09
TR-TT13
TL-HX10
TR-TT14
TL-HX11
TR-TT15
TL-HX12
TR-TT16
TR-TT17
TR-TT18
TR-TT19
TL-HX13
TR-TT20
TL-HX14
TR-TT21
TL-HX15
TR-TT22
TL-HX16
TR-TT23
TL-HX17
TR-TT24
TL-HX18

20. bverlaat@nikhef.nl Code Part number Functionality
Temperature range (°C)
Function
TR-TT25
PT100
TR-HX21
Dry-out monitoring
-50 / 40
Monitoring
TR-TT26
TR-HX24
TR-TT27
TR-HX25
TR-TT28
TR-HX26
TR-TT29
TR-HX27
Liquid inlet
Educational
TR-TT30
block 1
TR-TT31
TR-TT32
Vapor outlet
TR-TT33
Vapor return
TR-TT34
TR-TT35
Manifold
TR-TT36
Bellow flange
TR-TT37
TR-HT01
Control
Control loop
TR-TT38
TR-HT02
TR-TT39
TR-HT03
TR-TT40
TR-HT04
TR-TT41
Module base
TR-TT42
TR-TT43
RF-Foil
TR-TT44
TR-TT45
Transfer tube liquid outlet
TR-TT46
Local control box liquid inlet
TR-TT47
Capillaries inlet
TR-TT48
Local control box vapor outlet

23. Temperature sensors and heaters on the module base

24. Module base thermostatic heating schematics
30 Volt DC
Watlow K010030c500000
52.3Ω, 15 Watt max
Watlow K010030c500000
52.3Ω, 15 Watt max
Watlow K010030c500000
52.3Ω, 15 Watt max
Per heater assembly:
Vmax=30 Volt
R=8.7 Ω
Qmax=34.8 Watt
Imax=2 A
Earth
30 Volt DC
Watlow K010030c500000
52.3Ω, 15 Watt max
Watlow K010030c500000
52.3Ω, 15 Watt max
Watlow K010030c500000
52.3Ω, 15 Watt max
Earth
Heater Assembly #
Controlled by T-Sensor #:
Tx-HT01
Tx-TT37
Tx-HT02
Tx-TT38
Tx-HT03
Tx-TT39
Tx-HT04
Tx-TT40
Module Base Slow Control

25. Heater locations on Module Base39 92 89 42 91 87 37 40 90 94 41 88
Right side in figure 93 38
Middle in figure
Left side in figure
Heater locations on Module Base
Module Base Slow Control

26. Module Base Slow Control
Access holes
Interface Board
Module Base Slow Control

27. Module Base Slow Control Interface Board Layout
Not read out by repeater
Cable 4 longest
Cable 3
Cable 2
Cable 1 Shortest
Read out by repeater
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
TT93
TT41
TT94
TT42
TT91
TT43
TT92
TT44
TT89
TT37
TT90
TT38
TT87
TT39
TT88
TT40
HT01
HT02
HT03
HT04
Module Base Slow Control

28. Thermal model includes:
No heaters
(T~-13°C )
Homogeneous heating
(Q=25W)
Thermal model includes:
Invisible nodes of the module thermal model (from EN-05-01) & Evaporator connection
Radiation to environment
HT03=5W
4 Group heating
HT01=3W
Thermal model of a nominal case
Qdetector= 552 W
Tcooling=-30°C
Tenvironement= 30°C
HT04=8W
HT02=8W