Acting Physics Coordinator
6.8. - 12.8. Martin Jaekel
13.8. - 21.8. Paolo Martinengo
22.8. - 7.9. Martin Jaekel
8.9. - 11.9. Paolo Martinengo
| Date | dedicated MDs | ECN3 access |
|---|---|---|
| 10 August | Crystal shadowing from LSS4 (needs beam to North Area targets) | no access |
| 17 August | Splitting efficiency and lossless transport in TT20 (needs beam to North Area targets) | no access |
| 31 August | Barrier bucket transfer | access possible, tbd |
| 12 Sept | COAST for crab cavities and source/RFQ tests (during cooldown before injector Technical stop) | access possible |
| 15 Sept | COLDEX run (24h after injector technical stop) | access possible |
| 21 Sept | source/RFQ tests, then TT20 optics | potentially no access |
| 28 Sept | COAST for crab cavities | access possible |
| 5 Oct | crystal shadowing from LSS4 | access possible |
| 2 Nov | Slow extraction with multipoles | potentially no access |
Downtime:
Improvements
Physics:
Excellent proton beam delivery in the last week.
T9:STORM taking data. There were some minor issues in the control of the installed magnet for STORM but this has been solved thanks to the CESAR team and EPC’s support.
T10: No user, few tests for beam composition and new software.
T11: No user.
Weekly access went well. Beam was stopped at 6am (rather than 3am as requested) but due to the nature of the activities in both areas, the reduced cool-down time did not have an impact on the access. Conenctivity check on IRRAD9 table (all other experiments continue) and exchange of user in CHARM (CAEN/Wiener componets out and setup from BE-CEM in). Beam was good all along the week. We continue until next Wednesday for the access prior the high duty cycle week.
Outgoing week: very smooth installation of the experimental setup, which required also the positioning of a bending magnet. The plan of the measurement included the characterization of several PbWO4 crystals coupled to SiPMs and the study of the performances of an Active Photon Converter. The entire schedule has been fullfilled without delay. No problems to report.
Ingoing week: smooth installation, with few changes with respect to the previous setup. Currently there are no problems to report.
We will arrive at CERN on Aug 16 and we will start to move our stuff to B157 waiting to have the access to the beam area on Aug 17. Our set-up is very simple: we have just one table (assembled with Bosch-shape aluminum bars) with light instruments on the top. We do not have any HV voltage supply (i.e. no PMT) and the maximum current on low-voltage power is low (e.g. we do not have any specific hazard instrument). I am not sure to attend to this meeting since I have a limited internet connection in these days.
T4: Wobbling change to 400 GeV/c in P42 / -120 GeV/c in H6 / -300 GeV/c in H8. Will stay for the week.
H6: -120 GeV/c beam checked after the wobbling change. As the rate is lower for the negative beam compared to the positive the collimators were further opened to recover the rate for EP Pixel at the cost of larger beam sizes. The first test of EP Pixel required larger beam so this was ok. The smaller beam configuration will be checked today and if needed some optimisation will be done.
H8: Difficulties to set up 300 GeV/c electrons, low purity (as in the past).
Checked steering on T10 target after wobbling change, all ok. K12 TAX cooling pump failure, automatic switch to auxiliary pumps, so no downtime.
No issues except one quad fault which was due to two diode fault on the 30V of the electronic card. This was fixed by the first line.
No installation was needed, since it had been already performed during the previous week (STORM). The plan of the measurement has been changed on the fly, with respect to the original schedule, due to the absence of the run coordinator and other technical issues from our side. In the end, the schedule defined for the previous week for the STORM experiment has been carried out: a complete characterization of the e.m. shower development in two oriented PbWO4 samples (4.6 X0). No problems to report in terms of the data taking.
We had a minor issue related the control room (887-1-B21), in which a faulty temperature sensor triggers a power cut. This didn’t affect the data taking in any major way and we’ve been already informed that a solution is promptly on its way.
We continue the commissioning of the detectors and calibration this week. We calibrated the 4 HCAL modules with muons and hadrons, the ECAL and perform alignment of the trigger counters and trackers. Yesterday, during the MD, additionnal vacuum parts were introduced and detector elements from beam monitorig were removed. We observed after that that our trigger rate has increased by 9%, obtaining ~85% coincidences. We would like to thank the BE-EA department for performing this.
We plan to finish commissionning in the coming days and start data taking on Saturday.
Parallel user with EP Pixel this week. Will start today with installation of new sample and data-taking.
Tuning of beam settings for negative polarity by Dipanwita on Wednesday early evening. We started with testing Timepix3 iLGAD assembly. For this we use a relatively wide beam with 2E6 / spill in scintillator 532 (limited by radiation levels). Will change to small-area DPTS device and narrow beam during low-intensity period on Friday and keep these settings until next Wednesday.
Minutes by the respective speakers, edited by M. Jaekel and M. Schwinzerl