Clermont works during the April expert week CERN (2014 April - - PowerPoint PPT Presentation

Clermont works during the April expert week CERN (2014 April 14-15)

Romeo Bonnefoy and François Vazeille

• Deported HV system:

Implementation in the Building 175

• Mechanics: Comments
• Next expert week ?

1

Deported HV system

• Implementation in the Building 175

HV Prague HV Crate DCS HV bus

4 Long HV cables 4 Short HV cables 4 Round Connectors

2

Electronics room Module area HV Crate HV Bus boards and HV cables

Present option for the tests

3

HV output #16

Prague HV Power Supply in Building 175

4

DCS monitoring in Building 175

5

 HV crate back to Clermont-Ferrand for repairs !  Improvement of the connector mounting.  System fully operational for the next tests with the Chicago/Stockholm readout for the investigation of noise levels with 20 m and 100 m long cables. Too hard Clamping on Short cable #2

6

2 wrong channels  Bad round connector mounting

• OK with  meter test.
• Not OK with HV test

 Short circuit destroying the 2 Zener diodes (channels 12, 24) of Opto card by using the Clermont-Fd HV Power Supply (and not the Prague HV).

• Other comments

▪ Clermont-Fd making of a “load system” easy to connect replacing missing Mini-Drawers (1 to 4)

in order to suppress the “under current protection" of the HV Prague source.

▪ Two additional difficulties to solve

• Center-to-center distance in between the HV Bus fixation holes.

HV Bus card □ 78 mm on the Clermont-Ferrand drawings (given more than 1 year ago.) □ 80 mm on the Barcelona drawings and Mini-Drawers. 78 mm

• Present Patch Panel, not only too big for the Clermont-Fd Slider,

but not enough space to slip the connectors through its hole  To machine holes close to the edge as foreseen by Clermont-Fd.

7

Comments on mechanics

• Barcelona Patch Panel and Service tools

not compatible with Clermont-Fd tools (Not new today!).

• No bearing screw on the Barcelona Slider

 Strength fully on the Girder Rings

Strongly screwed Clermont-Ferrand proposition (Several times explained)

8

9

Next expert week

• New delivery of the deported HV system ready to work,

supposing Patch Panel difficulties overcame

• Participation to the readout tests using this HV system,

with comparisons with 20 m long and 100 m long cables, and also with the other system.

• Discussions strongly expected (before) about the mechanics.