Installation of bottom T sensors

ProtoDUNE-SP ITI meeting19/10/2017

M. Antonova, A. Cervera, P. Fernández, M.A. García, A. Izmaylov, M. Sorel, P. Novella, P. Bernabeu, J.V. Civera, P. Leon

IFIC - (CSIC & Univ. Valencia)

• 12 high precision sensors mounted on the bottom pipes (T)

• 12 standard sensors on the floor (F)

• Cables run attached to the pipes all the way to port 9.1 (prev. 9.3)

Bottom sensors2

9.3

T

T

T

T

TT TT TT TTF

F

F

SIDE view

FT TT T

9.1

F FF

F

F

F

F

F

F

F

F

TOP viewPipes in purple, cables in white

9.1

New pipe and port• Given the final C-shape of the LAr

return pipe we have estimated that using the GAr purge pipe could be better to route the cables

• We have agreed with the camera people in exchanging ports 9.1 and 9.3

3

9.1 9.3

cable support: vertical pipes• A U-shaped support with 31 grooves

• Cable can be introduced laterally

• The idea is to use a loop to hold the cable such that the cable can be kept tight at room temperature and at the same time allow for shrinkage (< 2cm/m)

4

• Cable bundle with 24 cables from port 9.1 to first support at vertical pipe, from where cables are routed individually

• We probably need another support at a higher level to hold the cable bundle

5

bottom sensor/cable supports• We have put special care in guarantying that

the cable does not touch any metallic element to avoid grounding loops in the case the outer teflon jacket is broken

6

teflon teflon

SS

FR4 support with two sensors

24 cm

100 cm

standard sensor on the floor

Cable supports: horiz. pipes7

6472

mm

2460

mm

2460

mm

3

3

3

3

2 2

2 2

1 2

1 2

3

3

3

3

2 3

2 3

1 2

1 2

3

3

3

3

2 3

2 3

1 2

1 2

3

3

3

3

2 2

2 2

1 2

1 2

33

3

3

6

6

6

6

6 6

6 6

3

3

3

3

cable supportfloor sensorpipe sensor

56 single (3 cables) 8 double (6 cables)

Cable lengths• Precision sensors (pipes):

• compute lengths based on 3D model with cable routing

• Add a bit of extra length ( 1m ?)

• Cut cables and make the cable-connector assembly in Valencia

• Standard sensors (floor): two options 1. Cut cables at CERN • Send 200 m of continues cable to CERN

• Sold sensor to the cable end (outside the cryostat), fully route the cable and cut it once outside the chimney

• Repeat the operation for the 12 sensors 2. Cut cables in Valencia based on 3D model with cable routing

8

Sensor support• Precision sensors: intermediate connector. Safer for the sensor, more

time for calibration

9

V+

V-

I+

I-

cable

IDC-4 female connector

IDC-4 male connector

epoxy

FR4 plate FR4 support

• Standard sensors: epoxied to membrane, studying the option of having a small FR4 support to give some mechanical strength to the system

Installation procedure 10

pipe SS split clamp

FR4 plate

SS elements to hold FR4 plate on split clamp

teflon plate to hold support

teflon plate to hold cable

Schedule• In principle installation foreseen for second week of November (6th)

• cable/sensor supports and cables

• Floor sensors

• Precision sensors will be installed later when the false floor is removed • This gives us more time for calibration

11

backup

Elements• Cable: available

• Split clamps for pipes: ready, including the new ones for gas pipe

• Cable supports: • horizontal pipes: ready

• vertical pipes: new prototype exists. Production next week

• Cable lengths: Pablo Leon is adding the cables and supports into the 3D model, lengths will be available next week

• Bolts: must be silver platted. We have identified a company that does it. To be done next week

• Small sensor supports and cable-connector assembly: final prototype ready tomorrow. Production next week

• Big sensor supports: depends on small support. Prototype and production next week (it is just an FR4 plate with few holes)

13

Sensor/cable labeling14

P2P1

P3

P5P4

P6

P8P7

P9

P11P10

P12

F1

F2

F3

F4

F5

F6

F7

F8

F9

F10

F11

F12

F1 - F12: floor sensorsP1 - P12: pipe sensors

Small sensor support• We need to produce 22 units for the 22 sensors we have. 12 will be

chosen based on the calibration

15

new design

current design

V+

V-

I+

I-