Upgrade news and Proposed interventions during YETS

for the Muon Barrel Alignment

Szillási Zoltán, Béni Noémi

(ATOMKI )

This project is supported by Hungarian Research Fund (OTKA) NK 81447 .

for the Hardware Muon Alignment Group

Outline

Short glimpse on the upgrade plans:

• Reinforcement of measurements in Sector 13 & 14

• Additional PG targets/redesign PG targets on MABs

• Programming extension to BoardPCs instead

• Bringing out BoardPCs from the gaps

Proposal for the YETS intervention*:

• Partial upgrade of the external reference measurement

• Intervention plans wrt. Wheels opening options

Barrel Alignment – Intervention and Upgrade proposal 22011. 10. 13.

* Don’t forget the Link Alignment as well!

Quick overview of the Upgrade Plan

Barrel Alignment – Intervention and Upgrade proposal 32011. 10. 13.

Upgrade plans – Reinforcement of measurements in Sector 13 & 14

• The reconstruction error for rotZ of MB4 twin chambers are higher than the other MB4 chambers.Reason: those chambers can seen only from one side

• Solution: install “Mini MAB” to those chambers. Very similar to the MAB, but it houses only 2 camera.

• The proposed positions are seen on the drawing below. Due to several reasons (blocking electronic and cooling cables) it is impossible to put Mini MAB to every twin chamber.

• Results of simulation calculation of errors are on the tables. The position calculations shows the worst case, where the chamber can be seen though two other chamber.

• With the Mini MABs the alignment precision for these chambers will be better.

Sector 13

Sector 14

Sector 4

Sector 10

X

rot_Z error:

Sect 13

Sect 13 Sect 4 Sect 4

Wheelw/out MM

with MMs

w/out MM

with MMs

mrad mrad mrad mrad2 0.13 0.046 0.11 0.0461 0.11 0.058 0.14 0.0580 0.48 0.056 0.48 0.055-1 0.11 0.046 0.14 0.046-2 0.13 0.046 0.11 0.046

Position error for YB0_sect13:

w/out MM with MMsmicrometer micrometer

phi 27.4 20.4R 1423.8 166.2Z 1511.2 90.1

rot_Z error:

Sect 14

Sect 14

Sect 10

Sect 10

Wheelw/out MM

with MMs

w/out MM

with MMs

mrad mrad mrad mrad2 0.13 0.046 0.11 0.0461 0.11 0.046 0.14 0.0460 0.48 0.045 0.48 0.045-1 0.11 0.046 0.14 0.046-2 0.13 0.046 0.11 0.046

Position error for YB0_sect14:

w/out MM with MMsmicrometer micrometer

phi 27.4 7.5R 1423.8 135.2Z 1511.2 70.1

Results of simulation

Cameras identical to those used for chimney-chamber regions

d

Carbon-fiber plate (5mm thickness)

Mini MAB

YB+2 YB+1 YB0 YB-1 YB-2

S4

Proposed MiniMABarrangement:

MAB

MiniMAB

S13

S10

S14

Barrel Alignment – Intervention and Upgrade proposal 42011. 10. 13.

Upgrade plans - Additional photogrammetry targets/redesign photogrammetry targets on MABs

• Motivation:– There was a discrepancy between the track-based and the

hardware alignments both in Z (2mm, scaling?) and phi-like torsion (3mm)

– So far we have only indirect ways to test where it comes from– Torsion has gone, but was not solved by muon hardware

alignment! We need a direct external measurement possibility.

• What to do?– Install additional photogrammetry target to MABs– These targets are viewable for photogrammetry

measurements, when the detector is already closed.– Only those targets are measurable, which are marked with

solid line. There is a slight chance to measure those target which are marked with dashed line. Impossible to make photogrammetry measurements in those places which are not marked.

• How?– Survey group could measure Z coordinates of them (or at

least Z distance)– Precision is around 70 microns (discrepancy, we had ~ 2mm!)– Maybe they can measure phi position as well ? answer for

torsion…– If Z-scaling found, its value can be used as a correction later.

Barrel Alignment – Intervention and Upgrade proposal 52011. 10. 13.

Map of Survey points in UXC

September TS -- Visual inspection has been done on the possibility on the MAB visibility and mounting of new Survey brackets on the UXC wall

Barrel Alignment – Intervention and Upgrade proposal 62011. 10. 13.

UXC Near side

PositiveNegative

X1

X0

X2

X3

X4

X5

+1/11-1/11-3/11

+3/1-1/1-3/1

-3/1

+3/11

YB-2 YB-1 YB0 YB+1 YB+2

Green – measurableOrange – difficult to measure, but not impossible

Barrel Alignment – Intervention and Upgrade proposal 72011. 10. 13.

UXC Near side

NegativePositive

X1

X0

X2

X3

X4

-3/7

+3/5 +2/6

+2/6

-3/5

-2/8+2/8 -1/9+1/9 -3/9

+3/7

YB+2 YB+1 YB0 YB-1 YB-2

Green – measurableOrange – difficult to measure, but not impossible

Barrel Alignment – Intervention and Upgrade proposal 82011. 10. 13.

YB0 -

-1/1

-1/3

-1/5

-1/7

-1/9

-1/11

Viewable MABs are for Survey measurements

YB+2

+3/1

+3/3

+3/5

+3/7

+3/9

+3/11

YB-2

-3/1

-3/3

-3/5

-3/7

-3/9

-3/11

YB0 +

+1/1

+1/3

+1/5

+1/7

+1/9

+1/11

YB+1

+2/2+2/4

+2/6

+2/8 +2/10

+212

YB-1

-2/2-2/4

-2/6

-2/8 -2/10

-212

Green – measurableOrange – difficult to measure, but not impossible

• Total Barrel length measurement at Sectors 1,5,11• Partial Barrel length measurement at Sectors 8,11

Barrel Alignment – Intervention and Upgrade proposal 92011. 10. 13.

Summary of "Investigation of Survey needs for the Barrel Alignment Upgrade" work package

Good positions:YB+1 X1 near, to measure +1/11 MAB -- OKYB-1 X1 near, to measure -1/11 MAB only bottom -- OKYB-2 X1 near, to measure -3/11 MAB -- One fix point need to install on the wallYB+2 X3 near, to measure +3/1 MAB -- One fix point need to install on the wall (holes are already on the wall)YB-1, YB0 X3 near, to measure -1/1 MAB -- OKYB-2 X3 near, to measure -3/1 MAB -- One fix point need to install on the wallYB-2 X4 near, to measure -3/1 MAB -- X4N25 rack is blocking, but it is still empty. One fix point need to install on the wall.

YB+2 X4 far, to measure +3/5 MAB -- One fix point need to install on the wallYB+1 X4 far, to measure +2/6 MAB -- One fix point need to install on the wallYB+1 X3 far, to measure +2/6 MAB -- One fix point need to install on the wallYB-2 X4 far, to measure -3/5 MAB -- One fix point need to install on the wallYB-1 X1 far, to measure -2/8 MAB -- One fix point need to install on inclined wall below the fire extinguisherYB0 X1 far, to measure -1/9 MAB -- One fix point need to install on inclined wallYB+1 X1 far, to measure +2/8 MAB -- OKYB-2 X1 far, to measure -3/9 MAB -- One fix point need to install on inclined wall

Not very good positions:YB+2 X1 near, to measure +3/11 MAB -- 2 fix point needed or 1 fix point on the wall (cables are on the wall)YB-2 X3 far, to measure -3/7 MAB -- difficult to measure (due to cooling pipe near to the wall) and one fix point need to installYB+2 X3 far, to measure +3/7 MAB -- difficult to measure (due to cooling pipe near to the wall), but it is possible to install a small bracket to inclined wall at X2 far

Barrel Alignment – Intervention and Upgrade proposal 102011. 10. 13.

Status of the Upgrade

Upgrade plans:

• Reinforcement of measurements in Sector 13 & 14 design has been started

• Additional PG targets/redesign PG targets on MABs prototypes production started survey of the external viewing possibilities done next: starting to mount external Survey brackets for external Wheels

• Programming extension to BoardPCs instead

• Bringing out BoardPCs from the gaps Nov TS: survey of possible places tomorrow: long cable check in ISR (promising!)

Barrel Alignment – Intervention and Upgrade proposal 112011. 10. 13.

Proposal for the YETS intervention

Barrel Alignment – Intervention and Upgrade proposal 122011. 10. 13.

Pending issues wrt. opening scenarios:

Repair of the bad fixation of MAB +3/5. This might take 2 hours and would require a scissor lift.

We would like to add extra photogrammetric targets to the following MABs: +3/1, +3/5, +3/7, +3/11, -3/1, -3/5, -3/7, -3/11. This is the feasilbility test of the upgrade.

Installation of extra Survey posts on UXC walls (close to final design in November)

Problems with the FrameLocker card of MAB -3/7. It should be replaced and be sent for diagnosis/repair. Depending on diagnosis, it might happen that the others are to be touched as well.

If MABs are to be (re)moved, survey after replacement and Link adjustment are necessary.

If chambers are to be moved as well, survey on chambers is also needed.

Opening EndCaps only

Barrel Alignment – Intervention and Upgrade proposal 132011. 10. 13.

Pending issues wrt. opening scenarios:

Problems with the FrameLocker card of MAB -2/10. It should be replaced and be sent for diagnosis/repair.

If MABs are to be (re)moved, survey after replacement is necessary.

If chambers are to be moved as well, survey on chambers is also needed.

Opening EndCaps + YB±2

Barrel Alignment – Intervention and Upgrade proposal 142011. 10. 13.

Pending issues wrt. opening scenarios:

Reload F/W of all MABs on YB0+ (would solve problems of MAB +1/9, too since May 2010)

Problems with the FrameLocker card of MAB +1/7. It should be replaced and be sent for diagnosis/repair.

If MABs are to be (re)moved, survey after replacement is necessary.

If chambers are to be moved as well, survey on chambers is also needed.

Opening EndCaps + all wheels

Barrel Alignment – Intervention and Upgrade proposal 152011. 10. 13.