1. Tertiary Vacuum Control
8 x 50 pins Electrical
Vacuum feed through connectors
VTCS sensor and actuator overview per VELO half
Tx_FL001
Tertiary vacuum
(036)
(048)
(047)
Tx_BD003
4x Mounting Board (Capacity = 20x PT100 & 2x Heater (2A) per board
(034)
Tx_PT002
(033)
Tx_PT004
Tertiary Vacuum Control
(035)
Local Control Box
Tx_PT003
Heater group Tx_HT001
Heater group Tx_HT003
Tx_VL02
Tx_VL009 _ +
(046) _ +
(037)
(039)
Tx_PT001
CO2 in
and outlet
Tertiary vacuum connection to secondary vacuum
(041)
(42) _ + _ +
(038)
(040)
Electrical Connector
Type: 6 pin LEMO (FGG.OB.306.CLAD52)
Heater group Tx_HT002
Heater group Tx_HT004
(004)
(001)
(018)
(015)
(032)
(029)
Electrical
Bulkhead Connector Type: 6 pin LEMO (EEG.OB.306.CLL)
(02)
(016)
(030)
(01) = Tx_TT01
(02) = Tx_TT02 ……
(48) = Tx_TT48
Temperature sensor labeling:
(007)
(008)
(009)
(010)
(011)
(012)
(013)
(014)
(017)
(019)
(020)
(021)
(022)
(023)
(024)
(025)
(026)
(027)
(028)
(031)
(003)
(005)
(006)
TL_HX001
TL_HX002
TL_HX003
TL_HX004
TL_HX005
TL_HX006
TL_HX007
TL_HX008
TL_HX009
TL_HX010
TL_HX011
TL_HX012
TL_HX013
TL_HX014
TL_HX015
TL_HX016
TL_HX017
TL_HX018
TL_HX19
TL_HX021
TL_HX23
TL_HX024
TL_HX025
TL_HX026
TL_HX027
TL_HX20
TL_HX22
(043)
(044)
Tx = TL for left detector half and TR for right detector half

2. VELO Thermal Control System
(VTCS)
Tertiary System Layout at VELO
VTCS Left Local Control Box
Test_Connection
Tertiary vacuum
Secondary vacuum
TL_VL006
TL_VL003
Vapor mixture return
S.15
Insulated concentric tube
TL_BD001
TL_PT001
TL_VL002
TL_PT002
TL_FL002
Liquid in
S.06
(046)
S.08
(047)
S.09.28
Left
S.05
S.07
TL_BD002
TL_VL001
TL_FL001
TL_VL004
S.10.01
S.10.27
TL_HX105
TL_HX028
TL_VL007
S.13
(048)
S.12.28
S.14
TL_VL008
TL_BD003
TL_PT003
(001) = Tx_TT001
(002) = Tx_TT002 ……
(048) = Tx_TT048
(xxx) = Internal rod sensor
Temperature sensor labeling:
S.11.01
S.11.27
TL_VL009
TL_PT004
Primary vacuum
Shielding wall
Secondary Vacuum
TL_BD004
TLR_VL001
Left Tertiary vacuum control
TL_HX001
TL_HX027
TLR_VL002
Right Tertiary vacuum control
S.01 = Tx_S.01
S = Tx_S.16.01
SB_S.0 labeling:
TR_HX001
TR_HX027
TR_VL009
TR_PT004
Secondary Vacuum
50 meter
TR_BD004
S.11.01
S.11.27
TR_BD003
TR_PT003
Vapor mixture return
TR_VL007
S.14
S.13
(048)
S.15
TR_HX028
TR_VL008
TR_BD001
TR_PT001
TR_PT002
TR_BD002
S.12.28
S.10.01
Right
S.10.27
Liquid in
S.06
(046)
(047)
S.09.28
S.05
TR_VL001
S.07
TR_FL001
S.08
TR_VL004
TR_VL002
TR_FL002
TR_HX105
Insulated concentric tube
VTCS Right Local Control Box
TR_VL006
TR_VL003
VELO Detector
Test_Connection
Tx = TL for left detector half, TR for right detector half, TLR for combined hardware

3. Tertiary VTCS schematics at RB84 plant
(101) = Tx_TT101
(102) = Tx_TT102 ……
(125) = Tx_TT125
(xxx) = Internal rod sensor
Temperature sensor labeling:
Tertiary VTCS schematics at RB84 plant
S.01 = Tx_S.01
S = Tx_S.16.01
Section labeling:
Vapor mixture from concentric tube
Liquid to concentric tube
Liquid to concentric tube
Vapor mixture from concentric tube
TL_LT101
TL_FL101
S.05
S.05
TR_FL101
TR_LT101
TL_BD103
TL_PT102
TR_PT102
TR_BD103
(101)
S.15
TL_VL113
TR_VL113
(101)
S.15
TL_VL101
(120)
(120)
TR_VL101
(109)
(109)
S.21
TL_BD101
S.16
TR_BD101
S.21
TL_BD107
TLR_VL111
S.16
TR_BD107
SA_HX107 /
TL_HX103
S.04
S.04
SA_HX108 /
TR_HX103
TL_VL112
TR_VL112
(108)
TLR_VL110
(108)
SB_HX107 /
TL_HX104
TL_VL102
TL_VL111
TL_HT103
TL_HT103
TR_VL111
TR_VL102
SB_HX108 /
TR_HX104
TL_AC101
(123)
(123)
TR_AC101
(125)
S.17
S.17
TL_PT104
(125)
TL_HT105
S.03
TLR_VL109
S.03
TR_PT104
TR_HT105
TL_PT101
TR_PT101
TL_BD102
TL_BD106
TR_BD106
TR_BD102
(107)
TL_VL109
TR_VL109
S.12.29
TL_HT104
S.09.29
S.09.29
TR_HT104
(118)
(116)
S.02
(116)
S.12.29
(107)
(103)
(124)
(117)
S.02
(117)
(124)
(118)
(104)
TL_VL110
TL_FL102
TLR_VL115
TR_FL102
TR_VL110
(103)
(104)
TLR_S.01
TL_VL108
TR_VL108
Tambient
SB_HX103 /
TL_HX102
TLR_VL107
TR_VL115
TL_VL115
(115)
(102)
(119)
TL_S.01
(102)
(119)
S.20
TL_HT101
(111)
TR_S.01
TR_HT101
TL_VL107
TR_VL107
(121)
(115)
S.20
TLR_HT102
(115)
(121)
SA_HX105 /
TR_HX101
SA_HX103 /
TL_HX101
(122)
(114)
(114)
S.23
TL_HT102
(114)
(122)
TR_HT102
SB_HX105 /
TR_HX102
S.18.02
(113)
(122)
(113)
(113)
S.23
(105)
TL_PT103
TR_PT103
(105)
(106)
S.18.01
(106)
TLR_PT103
S.18.01
S.18.02
S.22
TL_PM101
TL_VL103
(112)
TLR_PM101
(112)
TR_HX105
(112)
TR_PM101
S.22
TR_VL103
TL_BD104
TL_VL114
TL_VL106
TLR_S.20
TR_VL106
TR_VL114
TR_BD104
(110)
S.19
TLR_VL114
(110)
TL_VL105
S.19
TL_VL104
TR_VL104
TLR_VL105
TLR_VL101
Tertiary VTCS Left Detector (TL)
Tertiary VTCS Right Detector (TR)
Tx = TL for left detector half, TR for right detector half, TLR for combined hardware

4. Secondary VTCS main chiller (A)
(101) = SA_TT101
(102) = SA_TT102 ……
(122) = SA_TT122
(xxx) = Internal rod sensor
Temperature sensor labeling:
Secondary VTCS main chiller (A)
SA_PT102
SA_FL101
SA_SG102
S.01 = SA_S.01
S = SA_S.10.01
Section labeling:
3/8”
SA_S.06
3/8”
1/2”
SA_PT103 /
SA_TT109
SA_S.02
12ºC
SA_S.12.01
1/2”
3/8”
SA_HX101
(PA_TT102)
(120)
SA_S.12.05
SA_SG103
(105)
6ºC
SA_S.03
SA_SG105
SA_VL103/
129
SA_HX102
SA_S.07.05
SA_VL104
3/8”
(PA_TT101)
(102)
(114)
SA_VL107
SA_HX106
(103)
S.09.01
SA_VL127
3/8”
S.11.01
SA_S.04
SA_VL102
(119)
(108)
5/8” ½”
SA_VL108
SA_HX103 /
TL_HX101
3/8”
3/8”
SA_S.05
SA_VL117/130
SA_VL101
SA_S.11.05
SA_VL122/131
(106)
(107)
(104)
SA_PT105/
SA_TT116
SA_PT104 / SA_TT113
S.07.01
SA_VL106
S.08.01
SA_PT106/
SA_TT118 ½”
SA_HX108/
TR_HX103
SA_VL126 ½”
1/2”
7/8”
SA_AC102
SA_S.12.02
1/2”
SA_PT101
SA_HX107/
TL_HX103
SA_S.10.03
SA_S.10.04
SA_SG104
1/2”
SA_VL116
SA_VL121
SA_HX104
SA_S.01
(101)
SA_VL115
SA_VL120
3/8”
SA_VL111
SA-S.13
3/8”
SA_S.09.03
SA_S.09.04
S.09.02
S.11.02
SA_S.15
(112) ½”
SA_VL124/132
SA_PM101
(115)
SA_S.08.03
SA_S.08.04
(117)
SA_VL112
SA_HX105 /
TR_HX101
SA_PT107
3/8”
3/8”
SA_AC101
(122)
SA_VL114
SA_VL119
(110)
S.07.02
(111)
SA_VL110
S.08.02
SA_VL128
7/8”
3/8”
3/8”
SA_VL125/133
(121)
SA_VL123
SA_S.14
SA_PT108
Sx = SA for Water cooled chiller, SB for back-up air-cooled chiller

5. Secondary VTCS back-up chiller (B)
(101) = Sx_TT101
(102) = Sx_TT102 ……
(122) = Sx_TT122
(xxx) = Internal rod sensor
Temperature sensor labeling:
Secondary VTCS back-up chiller (B)
SB_SG102
SB_FL101
S.01 = SB_S.01
S = SB_S.10.01
Section labeling:
3/8”
SB_S.06
SB_PM102
SB_PT102
5/8”
SB_SG105
SB_HX101
SB_HX106 ½”
SB_S.07
(114)
(TT_PB101)
SB_PT109
(119)
(102
5/8”
SB_S.12
5/8”
3/8”
3/8” ½”
(105) ½”
SB_S.11.03
SB_S.04
SB_PT103
SB_TT109
SB_PT104
SB_TT113
SB_S.11.01
SB_S.11.02
SB_VL104
SB_S.11.04
SB_VL117/130
SB_VL122/131 ½” ½”
SA_VL127 ½”
SB_PT105
SB_TT116
SB_PT106
SB_TT118 ½”
SB_HX108/
TR_HX104
SB_VL108
SB_VL112
SB_S.01
SB_S.10.03
SB_S.10.04
5/8”
SB_HX107/
TL_HX104
SB_S.05
SB_VL107
SB_S.09.01
SB_VL111
SB_S.09.02
(104)
SB_VL116
SB_VL121
SB_AC102
(101)
SB_VL115
SB_VL120
SB_HX103/
TL_HX102
SB_HX105/
TR_HX102
SB_S.09.03
SB_S.09.04
SB_S.15
(107)
(111)
SB_PM101
SB_VL124/132
(115)
3/8”
3/8”
(117)
3/8”
SB_S.08.01
SB_S.08.02
(121)
3/8”
SB_S.08.03
SB_S.08.04
SB_S.13
SB_VL110
SB_VL125/133
SB_VL106
(122)
SB_VL114
SB_VL119
3/8”
3/8”
3/8”
3/8”
SB_PT108
Sx = SA for Water cooled chiller, SB for back-up air-cooled chiller

6. Acronyms bverlaat@nikhef.nl Px = Primary Cooling System (6-12°C Water)
PA= Primary A (6-12°C Water)
PB=Primary B (Ambient air)
Sx = Secondary Cooling system (R404a chiller)
SA = Secondary A
SB = Secondary 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
LT = Liquid Level Transmitter
TT = Temperature Transmitter
FL = Filter
PM = Pump/Compressor
VL = Valve
SG = Sight glass