Proposal for the Barrel Alignment Upgrade. Bencze György, Béni Noémi, Szillási Zoltán , Ujvári Balázs. (ATOMKI, RMKI ). the Hardware Barrel Alignment Group. This project is supported by Hungarian Research Fund (OTKA) NK 81447. Outline. Two bigger topics:.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Proposal for the Barrel Alignment Upgrade
Bencze György, Béni Noémi, Szillási Zoltán, Ujvári Balázs
(ATOMKI, RMKI )
the Hardware Barrel Alignment Group
This project is supported by Hungarian Research Fund (OTKA) NK 81447 .
Two bigger topics:
Two minor items:
And a wish…
Barrel Alignment – Upgrade proposal2
Barrel Alignment – Upgrade proposal3
Schematicview of the Barrel Alignment
light sources (LED)
Barrel Alignment – Upgrade proposal4
Sectors 4 and 10 are measured at the –phi side only (by 4 MABs)
Chambers in sectors 13 and 14 are measured at the +phi side only (by 2 MABs)
Barrel Alignment – Upgrade proposal5
What is measured (sect 13,14):
What is expected:
Fair results in X and Z at MB+/-1,2, weak in rot_Z, therefore also in Y (depending on the chamber orientation), very weak in general for YB0.
Barrel Alignment – Upgrade proposal6
Mean and Max errors (COCOA-errors only but real measurement data):
In X (all chambers, micrometer)2661
In Z (YB0 excluded, micrometer)2334
In rot_Z (YB0 excluded, mrad)1.92.0
Other rotations (all chambers): <0.3 mrad
In X: 61 micrometer;In Z: 2770 micrometer(!)In rot_Z: 13 mrad (!)
As expected but here we have the numbers
Barrel Alignment – Upgrade proposal7
Put a MiniMAB with 2 cameras at the joint region looking inside the wheel.
The cameras can observe the LEDs (already installed but not used so far).
The MiniMABs can fix the DTs wrt. each other.
Barrel Alignment – Upgrade proposal8
Cameras identical to those used for chimney-chamber regions
top and bottom
Carbon-fiber plate (5mm thickness)
Camera distance „d”:
Sector 13Sector 14
368 mm457.4 mm
Barrel Alignment – Upgrade proposal9
Barrel Alignment – Upgrade proposal10
Barrel Alignment – Upgrade proposal11
18 carbon-fiber platesto be bought (cheap)
36 video-sensorsavailable from spares
36 lensesfrom spares (f=20mm)
36 camera-housesto be fabricated
4 board-PCsfrom spares*
2 CAEN A3006 LV modulesto be bought (~12kCHF)
2 power distrib.+eth.switch parts (switch,
connectors, box) to be
bought, assembly needed
Camera-box assembly, calibration
Installation is possible during the next long shut-down when the barrel is opened.
Free spaces for LV modules and 1U distrib. modules are OK
* New BPC are to be installed only on YB±1. Otherwise use free ports of existing ones.
Barrel Alignment – Upgrade proposal12
Barrel Alignment – Upgrade proposal13
Easiest solution is to put distance meters on the wheels and read them out through the BoardPC. (since it would require the least cabling work)
Barrel Alignment – Upgrade proposal14
Sticks out -- vulnerable
Barrel Alignment – Upgrade proposal15
≥ 1300 CHF/pc !!!
Barrel Alignment – Upgrade proposal16
MAB volume (or close to it) is a good candidate
Barrel Alignment – Upgrade proposal17
Min 50kCHF (or rather above)
We propose to abandon this project
To tell the truth, we plan to be involved in a similar closing sensor, but:
Barrel Alignment – Upgrade proposal18
Barrel Alignment – Upgrade proposal19
This is a minor item, but having large impact…
Barrel Alignment – Upgrade proposal20
It would be nice to measure all 6 dof of a MAB, but it is impossible measure at least one point of it:
These points are surely seen from outside
Barrel Alignment – Upgrade proposal21
Barrel Alignment – Upgrade proposal22
Barrel Alignment – Upgrade proposal23
We would like to design and install a small device on BPC to solve it
This item is very small, but also requires access to MABs…
Barrel Alignment – Upgrade proposal24
Barrel Alignment – Upgrade proposal25
DT Calibration in ISR…
Barrel Alignment – Upgrade proposal26
Alignment measurements in UXC…
Tmeas ≠ Tcalib distance of alignment passages change APE gets worse
(αAl = 23.1 μm/K …might be 100 μm/K on MB4!!)
Barrel Alignment – Upgrade proposal27
Latest APE calculations σXlocal ~ 500μm (wrt. PG)
We belive that APE could be reduced if actual chamber temperature could be used.
(αAl = 23.1 μm/K …might be 100 μm/K on MB4)
Barrel Alignment – Upgrade proposal28
We have four items and would like to get the consent of the DT:
Institutes could be involved:
Probably all of these modifications could be made in 2013.
Barrel Alignment – Upgrade proposal29