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11th TREX meeting [ALFA & TOTEM/CT-PPS plans for TS1 2016, BRAN prototype]
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Europe/Zurich
874/1-011 (CERN)
NOTES from 11st TREX meeting (12/05/2016)
- 1- ALFA plans in TS1
Slides. Marzia asked if 1 day is enough, Sune answered that it should be, as there are no problems foreseeen for pumps. At most, 1 extra-day could be needed if there are problems in electronics.
it was agreed with ATLAS that 10% of the luminosity in stable beams could be accepted
It will go out after 600 bunches time qualification, no run for HL.
J. Baechler asked wheteher AFP can participate in the intensity ramps. This should be discussed with MPP and develop a procedure fr injection. In any case, the intent is to stop after this "600 bunches limit".
- 2- BRAN plans in TS1
Slides. BRAN pototype is performing good, there are just some readouts routinary of RadMons to be performed.
- 3- TOTEM & CT-PPS plans in TS1
Slide 1- Currently working on mechanical and vacuum.
Slide2- Ion pump needed in Q5. Theres's no need of ECR if the volume in the tunnel remains unchanged (an example of this is an exchange of a detector as silicon technology to a new one), but safety and vacuum activities are to be kept in mind. Discussions with M. Bernardini to prepare TS1 will follow.
G. Bregliozzi pointed that for him, if the equipment touches the beam an ECR is preferred.
A.L. Perrot informed that an independent ECR describing the "detector exchange" will be issued. In any case, the ECR's need to be approved quickly, as the activities are scheduled for June.
Slide 6, bullet 1 It is the only new detector that it is not an exchange, as there are no detectors there now.
Slides about mounting pieces. Box will be attached to the cable tray, which should be ok but still need to specify weight and foresee air circulation (work is ongoing) .
New cables will be installed by external colleagues (livermore)
G. Canale's team will start on tuesday.
M. Lamont asked wether the cable damage could be due to rush, J. Baechler pointed that the reason was the non respect of the instructions that G. Canale gave.
1012 particles reached, so don't want to risk the strips. Two main options are:
- change the whole detector package
- move up& down the Si strip position (which could break the RF fingers
After discussions with G. Bregliozzi the proposal is to do the X-ray test during TS1 and move it during TS2, but the request is that this opration will be monitored by LHC.
A.L Perrot asked wheter there's any concern for impedance. See slide 22 (new design circular, which is used now in timing detectors)
Plans for ferrite. If not ok, the need is to bakeout at 1100 C, which could be done inside CERN (new oven operating).
Preparation EYETS- Practice in Bd20 to check wether it is possible to do it without need to take the full element, which would imply the need of baking a whole Q5-Q6 sector for restablishing vacuum. This needs an ECR.
Slide 18. M. Bernardini questioned if the the routing of the cabling is validated an accepted by integration (Y. Muttoni). The current proposal needs access to the bottom of the QRL side, which requires an authorization from T. Otto.
On a side note, she informed that the TS1 could be extended to 8 days because LHC beam dump leak.
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