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Topic: Carlo Petrone's Personal Meeting Room
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- Factory Acceptance Test (FAT) on two ordered expected at warm conditions before the end of 2026 if components arrive at GSI by early December; otherwise, FAT will shift to January 2027.
- The first cooldown of the anti-crash assembly cannot take place in 2026 due to prioritizing test facility capacity for reworked Quadrupole Doublet Modules (QDM) needed for tunnel installation; cold testing a single component requires 1 month, and only 1 feed box is currently available.- PI Stretched Wire System Delivery, Calibration, and Hardware Stability
- The PI contract and contracted services must conclude in 2026, with 2D measurement services required in the first two weeks of December 2026 and payment targeted for mid-December 2026.
- The system must be mounted on the support frame, tested, and operational by the second week of November 2026.
- Applying 2D calibration factors alters stage trajectory diagonally to correct vertical misalignments, which could slightly change field measurement paths.
- Factors can be uploaded or disabled in the controller software at any time without blocking immediate use.
- Zero/baseline reference measurements must be completed before applying correction factors, requiring an on-site reference magnet at GSI for revalidation.
- The resonance frequency search issue during sag measurement was resolved by increasing the stage acceleration limit.
- Low-frequency noise was observed in measurements; verify that stage locking screws on the rails are properly tightened to eliminate low-frequency shaking. - Validation of Stretched Wire FFMM Scripts (AC and DC)
- Multipole and centering measurement scripts were successfully validated for both AC and DC modes.
- Stage movements along both axes were verified; moving one axis at a time (X or Y) provides higher precision and produces identical results.
- Repeatability tests confirmed consistent flux amplitude and multipole coefficient measurements. - Power Supply Limitations and Configuration Strategy
- The current built-in EA/Tektronix power supply is a 2-quadrant supply limited to DC up to 30 A (due to a faulty cooling fan under warranty) and cannot output negative voltage/current for AC mode.
- A Kepco bipolar power supply (±20 A) is available at GSI with analog input; options discussed include using it or procuring a GPIB-driven digital power converter capable of AC/DC sine wave generation. - DCCT Procurement Requirements
- The current DCCT only measures true RMS and cannot measure bidirectional AC current needed for FFMM post-processing.
- An updated version of the DCCT model currently used by CERN will be procured for GSI to enable proper AC measurements. - Rotating Coil Probe Development at GSI
- PCB production and mechanical layout contracts have been initiated.
- Mechanical drawings are scheduled to be sent out by mid-November 2026 to assess manufacturing capacity and receive quotes.
- PCB production lead time is quoted at 10 weeks, with efforts underway to negotiate faster turnaround.
- Axon wiring and connectors are largely available; manual assembly of cable harnesses will proceed in parallel with mechanical fabrication. - Long-Term Plans and System Improvements
- Hardware Integration and Upgrades:
- Installing a PI motor controller unit located in Building 311 into a CERN system (confirmed compatible with Stretched Wire 7).
- Considering replacing the PXI crate with a setup utilizing a Multifunction I/O (MIO) DAQ, requiring PC and component replacements.
- Noted hardware requirements for implementing vibrating and oscillating wire modes in the GSI system.
- Software Developments:
- Priority to integrate post-processing into the AC multipole script to eliminate dependency on external Python scripts.
- Continuous Acquisition R&D:
- Moving from static step-by-step acquisition to continuous acquisition along circular trajectories in DC multipole mode to reduce run duration.
- Concerns regarding dynamic wire oscillation stabilization and the requirement for stage triggering points. - System Delivery and Transportation to GSI
- Validation and Timelines:
- 1–2 weeks remaining to finalize DC mode measurements before transport.
- Full validation of the DC mode is the highest priority so GSI can use it directly upon arrival.
- Transport Logistics:
- Logistics must ensure direct delivery to the test facility, bypassing intermediate storage.
- Purchase and install shock sensors on shipping crates.
- Coordination between CERN and GSI transport procedures will be managed by Daryl and Anna with logistics contacts. - Tension Sensor Procurement
- Procurement Issues:
- Contact lost with the US-based provider of the tension sensor; delivery has not arrived and supplier communication is unresponsive.
- Standard 26-week lead time; sensor is sensitive to radial movements.
- Action Plan:
- Obtain direct contact from previous purchases to acquire multiple spare units for both CERN and GSI setups.
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