Sector Test Meeting 7th December 2005

Present:  Helmut Burkhardt, Verena Kain, Brennan Goddard, Roger Bailey, Mike Lamont (chair), Jan Uythoven, Stephen Jackson, Rhodri Jones, Roberto Saban, Katy Foraz, Esther Barbero Soto.

ML presented a brief summary of the issues of the sector test vis a vis hardware commissioning and installation.

Schedule

Near test milestones

More details here

Installation

Full list here

Installation – what needn’t be there

Given the list above there is little room for reduction on the installation front

• Q6 and associated DFBM: only if there’s a problem
• Transfer line collimators and absorbers
• TCDD
• Possible to live without a subset of beam instrumentation (BLMs) but not ideal.
  

Installation – what can’t be there

The temporary installation of the dump in IR7 implies the following constraints for the injection test:

• D4 not installed
• 4 primary collimators and 3 scrapers between D3 and D4 not installed
• D3 may be installed
• Ventilation doors for collimator enclosure not installed

Installation – temporary installation

Restricted to point 7:

• Dump
• Shielding
• Temporary vacuum pipe
• BCT

Installation - ongoing in the rest of ring

The main impact of the test on installation is its effects on ongoing installation elsewhere. The test will limit:

• Transport through 7-8 (if required) during preparation, test with beam and the recovery phase.
• Access to 6-7 during test
• Access through IR7.R after test which will most likely be a supervised zone for sometime after the test.
  

Installation afterwards

Given the removal of the temporary access gates, the TED etc. the main knock-on effect will be the declaration of the zone around the dump position and the injection region as supervised areas. Supervised areas imply:

• Between 1 mSv/year and 6 mSv/year
• Category B radiation worker to pass through
• Registered
• Medical every 2 years
• Personal dosimeter
• Followed the courses

Hardware commissioning

The required hardware and circuits are described here

Given the assumed schedule it is clear that the nominal 3 months of power tests requested for full hardware commissioning of sector 7-8 will be severely squeezed if the sector test is to take place as planned.

A discussion of about the possibilities of staging the HWC to meet the direct requirements of the sector test took place. It was noted that:

• Not all circuits are required for the test
• We will mainly power to the injection level
• Any cycling of the magnets could certainly be to below the 7 TeV level. It was agreed that 30% of nominal would be a reasonable target for the circuits concerned. Since confirmed by the magnet group (Luca Bottura).

Action: The hardware commissioning team will establish the minimum possible time required to commissioned the required hardware to the necessary levels.

Also noted:

• Cool-down of triplet-D1-D2-Q4-Q5: given that 8-1 should be full installed and cold, this should not longer be an issue - to be checked.
• Any shortening of the QPS controls commissioning should be compatible with the plans to deliberately quench some magnets with beam.

Hand over to operations

Also discussed was the potential handover of the sector to the operations group for machine checkout and access control.

It's clear that the test will remain a collaborative effort throughout the test with support of the HWC required for the duration. However, because of safety issues etc. a formal handover of responsibilities will be required. It was also noted that a dedicated machine checkout  period is necessary; coordinated by operations from the CCC. Exact dates to be established.