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Minutes of the PS-SPS Users Meeting held on 31 March 2022
Beam Sharing between PBS and PS users (E.Barbara Holzer)
The sharing aim for 2022 is:
- 40% to ISOLDE
- 1.66E12 p/s to nTOF
- 1 out of 10 cycles to IRRAD / CHARM
- 1 out of 20 cycles to T9 target
- 1 out of 20 cycles to T10/T11 target
These targets are ambitious. Whenever you do not need the beam (for 15 minutes), please inform the PS operators, so that it can be re-assigned to other user! We have to avoid that beam is dumped (unless required e.g. for set-up or muons beams), to limit the activation and to achieve the sharing targets.
Supercycle length of around 40 basic periods are desirable. But the next 4 weeks will be scrubbing and commissioning in the SPS. Frequent supercycle changes are to be expected. The 2022 “Basic Super-Cycles” are being worked on.
PS Machine Report (Alexandre Lasheen)
Start of physics for PS Users (TOF, EAST) in week 13.
The machine availability during the week was good with downtime due to issues with the DTL in Linac4, which will be investigated during the beam stop Friday 10:00-11:30.
The TOF beam is delivered for physics with excellent beam quality. This achievement required an important rework of the cycle settings and was obtained from the excellent communication between the user/operation/beam physicists.
Major efforts are also invested in the EAST beam to fine tune the beam quality, reproducibility, spill quality. More cycles can possibly be accomodated in the supercycle depending on the activity. Notably the beam was produced on request for EAST_T9 for LDMX setup.
Next items are the intensity ramp-up for the SFTPRO/MTE and AWAKE beams in PS.
SPS Machine Report (Giulia Papotti)
SAFETY (Evelyne Dho, James Devine & Letizia Di Giulio)
East Area users tour de table
EA beams status (D. Banerjee / B. Rae / J. Bernhard)
Commissioning of T09 and T10 beam lines have been completed and the beam lines are ready for physics since March 28th. The beam on T11 has also been checked with the CLOUD detectors and it has been tuned. The current limits on the power converters have been updated by EPC to reach the design maximum momentum of 3.5 GeV/c in T11. In T09 a 16 GeV/c beam has also been checked. Various pressure scans are ongoing with the XCETs at different momenta during the evenings in T09 while the LDMX setting up is ongoing during the coming days.
T8: IRRAD and CHARM (F. Ravotti & G. Pezzullo / S. Danzeca)
End of last week and the weekend was mostly used by the beam operation to optimize our EAST_T8 beam with short access slots in IRRAD/CHARM to debug problems and inspections. Monday morning we performed a combined T8.BCT / Al-foils calibration run (using EAST_FAST_T8) that showed that the T8 beam extraction and transmission significantly improved since 2021 (from >25% losses, down to <10% - preliminary results, to be confirmed by the Al-foils analysis still ongoing). From the afternoon we started alignment and calibration measurements in the various IRRAD positions and on the CHARM target. Since yesterday evening, the calibration/verification of the CHARM radiation field with the different facility configurations started. We needed stop the beam overnight for solving a problem with the remote control of some of our movable equipment. This problem was solved early this morning and the beam restarted. We will continue running our calibrations with standard beam condition and intensity until Monday when we will request another access (to be communicated with usual e-group) .
T9: LDMX (B. Echenard)
The prototype has been fully assembled and installed in the test beam area last Friday (the new portable crane in the hall was very convenient for the work. The prototype is currently 85% cabled - one of the six front-end electronics board needs to be repaired - but the system is sufficiently complete to perform all commissioning activities. The faulty board should be fixed early next week and installed within a few hours afterward.
The readout electronics, including the RCE DAQ system, NIM logic and front-end electronics (based on the CMS HGCROC), is being commissioned. The firmware of the RCE DAQ system has been upgraded, and the system is now operational. We can read data from the detector SiPMs using the beam trigger signal, and we are now working on adjusting the pedestals and calibrating the scintillator response. Additional upgrades of the DAQ system to further increase the readout rate are planned.
We can read beam instrumentation data (Cherenkov detectors and beam trigger scintillator) and the white rabbit signal. Effort to finalize the integration of all the data streams into the DAQ software (EUDAQ) is on-going. An online analysis pipeline has been set-up to let us visualize the detector response in real time, and we are further developing tools to correlate the trigger data with the fiber tracker data recorded by the DIP server.
Since the front part of the prototype already became ready over the weekend, and the person that built it is just here this week, we got some beam yesterday. The safety inspection was therefore done last Tuesday and on short notice (many thanks!), and we received the safety clearance. We collected a significant early data sample with this detector part.
We continue the commissioning of the whole system to be ready in time. During that commissioning period it could be useful with some limited beam, when the other beamlines are not using all their cycles.
We express our thanks to the CERN staff Dipanwita, Aboubakr, Bastien, Inaki and their colleagues for their excellent help.
T10: ATLAS HGTD (speaker)
Telescope & Infrastructure (Andre)
ACONITE was set up in T10 and it is operational. Nitrogen, rack, tables, DESY table, etc. were provided. TLU2/EUDAQ2 setup progressing well; telescope only tested successfully with beam after safety clearance. Issue: Julabo chiller used for cold box was damaged during transport; followed up (incient report https://edh.cern.ch/Document/9184967 ) and workarounds pursued.
HGTD specific (Lucia, Djamel)
n_TOF (Michael Bacak)
Physics start on Monday - running successfully.
Observed pre-pulses Thursday last week & informed PS. Team from PS made a huge effort Thursday afternoon - Friday afternoon. Fixed Friday afternoon; one of the cleanest beam we ever observed. Big thanks!
COMPASS (Stefano Levorato)
The COMPASS commisioning is progressing well. After the target material loading on 22nd
of March the target has been cooled down reaching 4K on the 28nd. The Target loadin platform has been removed an the beam telescope platform installed. The Beam traker is beeing moved to it nominal position for the first preliminary survey on April the 1th
. The Spectrometer preparaion is progressing according to schedule.
NA64mu (Vladimir Poliakov)
The preparation of April beam run is ongoing. Commissioning of the detectors were started.
Supercycles, Wobbling, Target intensities
AOB
Minutes by the respective speakers, edited by E.B. Holzer
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