# Presentation: 232998

## NuMI Beam StartupS. Childress, 3 Nov.’04

- NuMI beam system readiness at conclusion of current shutdown:
- Extraction and Primary beam ready for initial beam startup by
-      3 December
- Hadron Absorber ready for initial beam startup by 3 December
- Target Hall can accept low intensity beam in target out mode by
-     3 December. Full beam readiness in 2nd half January ’05
- A high priority is to understand / resolve any significant NuMI extraction and primary transport issues while accelerator systems are still in start-up mode, and before pbars are stored in Recycler. NuMI extraction components and a major part of primary transport are in the MI / Recycler tunnel interlock region.
**Requested NuMI low intensity beam start-up beginning**
** ****Friday, 3 December**

## NuMI Startup Constraints

- All MI interlock area tunnel work complete including downstairs check-out prior to shutdown completion
- This is going well, and is on track to accomplish this
- Power supply start-up for MI region to be conducted  in evenings and week-ends once MI secure. Ongoing now on week-ends in Pretarget.
- Only one power supply / load combination not checked out before shutdown – HV101 (Here pre-shutdown load was 2 magnets which had fringe field shields for Recycler in place then. Now all 6 magnet shields are complete, and system is ready for full PS checkout)
- Kickers pulsing at full current now
- Detailed pre-beam commissioning  to be conducted in period immediately after shutdown ends.
- MI extraction bump setup and sensitivity to NuMI Lambertsons field measured before shutdown
- Recheck during early MI running,  plus measure Recycler sensitivity to full shielded HV101 string

## NuMI Startup Constraints (cont)

- Establish stable MI beam orbits
- Initial run plan to preclude significant radiation of target hall chase and components
- Radioactive component handling checkout still needed after initial beam operation
- MARS runs have been done to set integral beam flux parameters, and preclude radiation of target hall chase (beyond low levels already present in shielding steel)
- Completion of SAD, ARR and all readiness approvals
- Approval process ongoing now (N. Grossman ldr. for NuMI)
- Desire to limit schedule impact on ongoing target Hall Work
- Schedule NuMI beam time near week-end
- Essential need for support staff personnel during initial beam start-up
- Schedule first beam effort during normal hours (Friday)

## Schedule & Intensity Details

**Schedule: **
- Request NuMI** **beam cycle in timeline for a total of four 12 hour shifts – one shift on each of Friday 3 Dec., Saturday 4 Dec. and two shifts on weekend of 10-12 Dec.
- Specific request for first period is
- Friday 3 Dec. 0900 – 2100
- Saturday 4 Dec. 0900 – 2100
- A meeting to review start-up plans with AD experts is scheduled for 11 Nov.
**Intensity:**
- Based on MARS results plan for integral NuMI intensity of < 1E14 protons in a 48 hour period
- Operation for first weekend at 3E11 protons/pulse, with one NuMI cycle in a supercycle of 180 seconds
- Will then control beam switch for NuMI to transport beam only after previous pulse understood

## Pre (NuMI beam) commissioning

**We can – and will – establish readiness of systems for primary beam ****prior to ****first extracted beam pulses.**
- These include:
- Magnet function & connection polarities
- Power supply function / ramp parameters
- Kicker & power supply function
- Recycler shielding from EPB fringe fields
- Instrumentation function and readout polarities
- Beam Permit System [ establish & test 1st limits for all but NuMI BLM’s]
- Control timing
- Verify documentation capability – Profiles,BPM’s,BLM’s, Intensity
- Main Injector beam suitable for extraction

## Initial Beam Priorities

**Know that the basics work**
- Establish beam to the Hadron Absorber
- Verify kicker system function
- Verify instrumentation function
- Verify appropriate beam optics
- Verify alignment with beam
- Quads for acceptable corrector currents
- Limiting apertures for beam loss control
- Radiation safety verification for levels from first low intensity operation
- Understand any problems which can need tunnel access, and plan for solutions
- As part of initial commissioning process, fully utilize and verify function for beam permit and beam control systems
- 2nd weekend run plan priorities will utilize feedback from first weekend efforts including option for some higher intensity pulses with limit ~ 1.5 E12 for a small number of cycles.
- Once beam established to hadron absorber using minimum number of pulses (at 3e11), initiate a controlled effort to understand problems and parameters:
- Hardware function
- Optics
- Alignment
- Emittance
- Aperture problems
- Intensity effects (3e11 to 1.2e12)
- Access requests as needed for repair
- Use time between the two weekend beam periods to carefully plan needs and efforts for 2nd weekend beam. Goal – understand what needs addressing before we can transport > e13 / pulse in January.

## Contingency Planning

-    The plan for a total of four beam shifts from 3 December to
-    12 December should give us a good idea of NuMI extraction and primary transport function, in preparation for extensive NuMI beam operation beginning in January ’05.
-    In the event of significant issues which need addressing prior to high intensity operation, our requests will clearly adapt accordingly