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 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 * Don’t forget the Link Alignment as well!

Quick overview of the Upgrade Plan Barrel Alignment – Intervention and Upgrade proposal

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 4 Wheel w/out MM with MMs w/out MM with MMs mrad Position error for YB0_sect13: w/out MMwith MMs micrometer phi R Z rot_Z error: Sect 14 Sect 10 Wheel w/out MM with MMs w/out MM with MMs mrad Position error for YB0_sect14: w/out MMwith MMs micrometer phi R Z Results of simulation Cameras identical to those used for chimney-chamber regions d Carbon-fiber plate (5mm thickness) Mini MAB YB+2YB+1YB0YB-1YB-2 S4 Proposed MiniMAB arrangement: MAB MiniMAB S13 S10 S14 Barrel Alignment – Intervention and Upgrade proposal

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

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

UXC Near side PositiveNegative X1 X0 X2 X3 X4 X5 +1/11-1/11-3/11 +3/1-1/1-3/1 +3/11 YB-2YB-1YB0YB+1YB+2 Green – measurable Orange – difficult to measure, but not impossible Barrel Alignment – Intervention and Upgrade proposal

UXC Near side NegativePositive X1 X0 X2 X3 X4 -3/7 +3/5 +2/6 -3/5 -2/8+2/8-1/9+1/9-3/9 +3/7 YB+2YB+1YB0YB-1YB-2 Green – measurable Orange – difficult to measure, but not impossible Barrel Alignment – Intervention and Upgrade proposal

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 +1/1 1 YB+1 +2/2 +2/4 +2/6 +2/8 +2/ YB-1 -2/2 -2/4 -2/6 -2/8 -2/ Green – measurable Orange – 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

Summary of "Investigation of Survey needs for the Barrel Alignment Upgrade" work package Good positions: YB+1 X1 near, to measure +1/11 MAB -- OK YB-1 X1 near, to measure -1/11 MAB only bottom -- OK YB-2 X1 near, to measure -3/11 MAB -- One fix point need to install on the wall YB+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 -- OK YB-2 X3 near, to measure -3/1 MAB -- One fix point need to install on the wall YB-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 wall YB+1 X4 far, to measure +2/6 MAB -- One fix point need to install on the wall YB+1 X3 far, to measure +2/6 MAB -- 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 wall YB-1 X1 far, to measure -2/8 MAB -- One fix point need to install on inclined wall below the fire extinguisher YB0 X1 far, to measure -1/9 MAB -- One fix point need to install on inclined wall YB+1 X1 far, to measure +2/8 MAB -- OK YB-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 install YB+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

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

Proposal for the YETS intervention Barrel Alignment – Intervention and Upgrade proposal

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

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

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