1. VELO Thermal Control System
(VTCS)
Tertiary System Layout at VELO
VTCS Left Local Control Box
Tertiary vacuum
Secondary vacuum
Vapor mixture return
Insulated concentric tube
TL-PT01
TL-PT02
TL-VL01
TL-FL1
Liquid in
Left
TL-HX28
TL-PT03
TL-VL02
TL-PT04
TL-BD01
TL-HX1
Primary vacuum
Shielding wall
Left Tertiary vacuum control
TL-HX27
Right Tertiary vacuum control
TR-HX1
TR-HX27
TR-VL02
TR-PT04
TR-BD01
50 meter
TR-PT03
Vapor mixture return
TR-HX28
Right
Liquid in
TR-PT01
TR-PT02
Insulated concentric tube
TR-VL01
TR-FL1
VTCS Right Local Control Box
VELO Detector

2. Tertiary VTCS schematics at RB84 plant
Vapor mixture from concentric tube
Liquid to concentric tube
Liquid to concentric tube
Vapor mixture from concentric tube
TL-LT01
TR-LT01
TL-BD02
TL-PT06
TR-PT06
TL-VL03
TL-VL16
TR-VL16
TR-VL03
TR-BD02
TRL-VL18
SA-HX05 /
TL-HX31
SA-HX06 /
TR-HX31
TL-PT05
TR-PT05
TRL-VL17
SB-HX05 /
TL-HX32
SB-HX06 /
TR-HX32
TL-VL15
TR-VL15
TL-AC01
TR-AC01
TL-HT05
TR-HT05
TRL-VL12
TL-HT06
TL-VL14
TL-PT07
TR-PT07
TR-VL14
TR-HT06
TL-VL13
TR-VL13
TL-VL09
TR-VL09
SB-HX03 /
TL-HX30
SA-HX04 /
TR-HX29
TL-VL08
TRL-VL11
TR-VL08
SB-HX04 /
TR-HX30
SA-HX03 /
TL-HX29
TL-PM01
TR-PM01
TL-VL04
TRL-PM01
TR-VL04
TL-VL07
TR-VL07
TL-VL06
TL-VL05
TR-VL05
TR-VL06
TRL-VL10
Tertiary VTCS Left Detector (TL)
Tertiary VTCS Right Detector (TR)

3. Tertiary Vacuum Control
8 x 50 pins Electrical
Vacuum feed through connectors Type: #
VTCS sensor and actuator overview per VELO half
Tx-FL01
Tertiary vacuum
(44)
Tx-BD01
4x Mounting Board (Capacity = 20x PT100 & 2x Heater (2A) per board
(48)
(47)
(37)
Tx-PT02
(36)
Tx-PT04
Tertiary Vacuum Control
Local Control Box
Tx-PT03
Tx-VL02
Heater group Tx-HT01 (6x Watlow K010030c500000)
Tx-PVL01
Heater group Tx-HT03 (6x Watlow K010030c500000)
(46)
Tx-PT01
(38)
(40)
CO2 in
and outlet
Tertiary vacuum connection to secondary vacuum
(45)
(39)
(41)
Electrical Connector
Type: 6 pin LEMO (FGG.OB.306.CLAD52)
Heater group Tx-HT02 (6x Watlow K010030c500000)
Heater group Tx-HT04 (6x Watlow K010030c500000)
(27)
(24)
(31)
(28)
(35)
(32)
Electrical
Bulkhead Connector Type: 6 pin LEMO (EEG.OB.306.CLL)
(25)
(29)
(33)
(26)
(30)
(34)
(04)
(05)
(06)
(07)
(08)
(09)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(01) = Tx-TT01
(02) = Tx-TT02 ……
(48) = Tx-TT48
Temperature sensor labeling:
(01)
(02)
(03)
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
(42)
(43)
Tx = TL for left detector half and TR for right detector half

4. VTCS control integration for 1 VELO half
Cooling connector
Connector onto Evaporator
Evaporator
Outdoor T-sensors to dummy rep. board
Dummy repeater board
VTCS local control box
Tertiary vacuum control
2x3 P-sensors
Evaporator into Module base
Evaporator sensors to connector board
2x4 Heaters
2x48 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. Quantities for 1 detector half
4x P-sensors TxPT01-TxPT04
4x Shielded cables 6 wire
SCEM
VTCS Local Control Box
Dummy Repeater Board
T-Sensor
TxTT45-TxTT48
48x T-sensors TxTT01-TxTT48
4x Shielded cables 50 wire
SCEM
37x T-Sensor
TxTT01-TxTT37
7x T-Sensor
TxTT38-TxTT44
T-Sensor
TxTT38-TxTT44
4x Heater
TxHT01-TxHT04
VTCS Cabling logic at VELO
4x Heater TxHT01-TxHT04
4x Shielded cables 4 wire
SCEM
Quantities for 1 detector half
T-sensor signal wires
P-sensor signal wires
Heater power wires

7. Module base thermostatic heating schematics
48 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:
48 Volt
34.8 Ω
66 Watt
1,37 A
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-TT38
Tx-HT02
Tx-TT39
Tx-HT03
Tx-TT40
Tx-HT04
Tx-TT41

8. INTERFACE BOARD LAYOUT

9. Evaporator temperature sensor layout at interface board
TT01
TT06
TT11
TT16
TT21
TT26
TT31
TT36
TT02
TT07
TT12
TT17
TT22
TT27
TT32
TT37
TT03
TT08
TT13
TT18
TT23
TT28
TT33
Free
TT04
TT09
TT14
TT19
TT24
TT29
TT34
Free
TT05
TT10
TT15
TT20
TT25
TT30
TT35
Free
Free
Free
Free
Free

10. Detector support sensor and heater layout at interface board
TT38
TT43
Free
Free
Free
Free
Free
Free
TT39
TT44
Free
Free
Free
Free
Free
Free
TT40
Free
Free
Free
Free
Free
Free
Free
TT41
Free
Free
Free
Free
Free
Free
Free
TT42
Free
Free
Free
Free
Free
Free
Free
HT01
HT02
HT03
HT04

11. 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