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Minutes of the PS-SPS Users Meeting held on 24 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 (B. Salvant)
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MTE: Setting up
- Core only ready with 200E10 p/p, sent to SPS with 50E10 p/p
- 5-turn extraction ready with 1400E13 p/p
-
FTN line: new optics commissioning (Y. Dutheil) following FTN line modifications during YETS
- Goal: increase vertical beam size on target
- TOF cycle with ~850E10 p used during end of week
- Converging towards an agreed compromise between losses and beam size between SY-STI and RP:
- 30 mm H & 13 mm V at 850E10 ppp on the SEM grid
- Perform a radiation survey in FTN after about a month of stable high intensity TOF operation (sometime around end of April, after 30 h of cool-down).
-
Preparation of EAST FAST and slow extracted beams
- Beam sent to T8/9 and EAST N targets
- HL knobs and logicals created for automatic scaling of extraction and transfer line
- New YASP configuration for T8 using EA special BPMs prepared
- Optimiser on magnet currents for fast extracted beam: improved from 70% to 93% transmission.
- Optimiser to find best septum position/angle: ongoing.
-
AD cycle set up for FTA line commissioning (started Tuesday)
- Even and odd (up to 5) number of bunches
- Hot spot confirmed in F16 (BLM248): optimizer has not found a suitable configuration yet. Being followed up with high priority.
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LHC25ns cycle delivered at 1.75E11 p for SPS scrubbing
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 the beam lines is going on. We have seen beams in all the T09, T10 and T11 lines with very good progress on the T09 and T10 beams, achieving same or better quality compared to 2021. T10 is limited to 10 GeV/c asn an upper momentum for the moment due to an optimisation on the main power supplies, T09 can go up to 15 GeV/c (design value). For T11, CLOUD is still installing their new detectors and we can start with the beam commissioning from Friday, March 25th. The access procedure for the XCETs has been accepted and the detectors can be operated at 15 bars.
T8: IRRAD and CHARM (F. Ravotti & G. Pezzullo / S. Danzeca)
In parallel to the T8 beam commissioning at the PS we are using the EAST_FAST_T8 beam to (1) commission/check the BI (and associated signals) both in T8 and in our irradiation areas, (2) test new software tools (integate the IRRAD-BPMs into CCC applications, etc.) and (3) finally perform an intensity calibration run with the T8-FBCT and activation-foils (now scheduled next Monday morning). We require a few accesses until the end of the week to complete the commissioning of our irradiation control and monitoring systems (see planning e-mail). Next Monday afternoon we plan to start the dosimetry, aligment and calibration of the standard EAST_T8 (slow extracted) beam. In parallel we are preparing the first experiments aiming to start user operation on April 6th. In the IRRAD system we have already 9 requests for experiments (some requiring very long irradiations). In the CHARM calendar, 12 experiments are alredy scheduled for installation in the mixed-field area, until the beginning of July.
T9: LDMX (T. Akesson)
A contingent of collaborators has arrived on site to work on the test beam setup. We have started the assembly of the support structure and the detector planes in the staging area. The support structure and all vertical planes should be ready to be craned inside the test beam zone Friday morning, then we will add the remaining horizontal planes and the trigger scintillator system (the horizontal planes are not strongly fastened to the support structure, so it is more efficient to install them once the setup has been craned into its final position). We plan to have the prototype fully cabled by the end of the weekend. In parallel, we are installing and commissioning the electronics and the DAQ system. The new HGCROC boards have been powered and first indications are that they work as expected, we are now moving forward with testing and commissioning this system. Steady progress on the RCE-based DAQ system are made (firmware and software development), and we are improving the data analysis software and monitoring tools so that we can quickly understand the detector response. Patrol / CESAR training has also been organized.
T10: ATLAS HGTD (speaker)
Telescope & Infrastructure (Andre)
ACONITE has been packaged and transport will take place today 14:00 from H6A. Movement with crane within EA unclear yet (DESY table; alignment; telescope on DESY table; rack; additional two tables and support; two pallettes with material; two chillers) but most likely all together Monday afternoon. Depending on transport the installation and commissioning will start latest Monday afternoon and continue on Tuesday (probably early afternoon). If it works out earlier and if there is access it might start earlier. Gas installation (N2) scheduled for today by David JAILLET.
HGTD specific (Lucia, Djamel)
- Material to be installed in the area: FEI4, SiPM, MCP-PMT, 4 HV power supplies: up to 600 V for LGADs + 2.5 kV for MCP time reference + LV, 2 oscilloscopes, slow control computer, frames for DUTs, Temperature sensors and control (arrived at CERN)
- work on the acquisition with eudaq2/TLU2 during the first couple of days and install the old eudaq1/TLU1 as backup.
- perform as soon as possible measurements with irradiated LGADs: performance measurements. First batch of sensors to be delivred on Monday.
n_TOF (Nikolaos Patronis)
For the n_TOF we had first beam on 14/3 and we are ready to start physics on 28/3. During LS2 a new experimental area was constructed just a few meters away from the lead spallation target. First approved measurement of the new experimental is already covering the full beam-time of this year and most probably will be extended to the 2023 campaign.
For EAR1 the first physics measurement is the 79Se(n,g) cross section measurement. In this measurement the i-TED detector will be used for the first time.
For EAR2 the first physics case is the 94Nb(n,g) cross section measurement. Also in this measurement a new detection system will be used for the first time: the segmented C6D6 sTED detector.
For the newly built NEAR station neutron capture cross section measurements will take place as to benchmark the technique of neutron energy shaping into a Maxwellian spectrum.
For the n_TOF facility it is very important to solve the problem of the observed pre-pulses.
COMPASS (Stefano Levorato)
The COMPASS commisioning preliminary planning is presented. The readiness status of the COMPASS apparatus is briefly discussed.
The 2021 polarized target accident fixing is illustrated as well as the improvements for the PT operation.
The current planning for the 2022 restart sketched.
Supercycles, Wobbling, Target intensities
AOB
Minutes by the respective speakers, edited by E.B. Holzer
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