# Presentation: 142414

## LQ R&D Plans (focused on Magnet Structure) Giorgio Ambrosio

_**LQ R&D Plans **_**(focused on Magnet Structure)**** *****Giorgio Ambrosio***

***Long Quad Magnet Structure Review ***
***Nov. 28-29, 2007  ***

- OUTLINE:
-  LQ support structure plans
-  LQ coil fabrication plans
-  Risk analysis
-  Schedule and budget

## Advantages of each structure

**Each TQ structure has unique advantages:**
**Partial list of features that could benefit to the LQ plan**
**Shell-based structure:**
- - TQS02 exceeded the 200 T/m goal with ~10% margin (4.5 K)
- - Very short magnet assembly/disassembly time
- Attractive features for LQ01
**Collar-based structure:**
- - All TQC models reached 200 T/m
- - Can provide short-term test of long Nb3Sn coil alignment
- Attractive for LQ02/3

- Nb3Sn Technology Scale-up for LARP

## Plan Overview

**LQ01 with ****shell-based structure**
- Achieve LQ target gradient with structure allowing quick exchange of coils (if needed)
**LQ02 with ****collars-based structure****, with LQ01 coils**
- Demonstrate more accelerator magnet features with long Nb3Sn coils
- Significant savings by reusing LQ01 coils
**LQ03 with ****shell-based structure ****if LQ01 will be successful**
- Demonstrate reproducibility using new coils

- Nb3Sn Technology Scale-up for LARP

## Plan - I

**LQ01 (****shell-based structure****) plan:**
- Structure design, fabrication, assembly with dummy coils at LBNL
- Test at LN with dummy coils of short model (LBNL), or whole structure (BNL) - (FY08 contingency)
- LQ01 assembly at BNL (FY08 cont. or FY09)
- LQ01 test at 4.5 K at BNL
- Shipment of LQ01 to FNAL
- Possible test at 2.5 K (1.9 K) at FNAL
- Presently has low probability
- Disassembly at FNAL

- FY08

- FY09

- Nb3Sn Technology Scale-up for LARP

## Plan - II

**LQ02 (****collar-based structure****) plan:**
- Long-lead items procurement at FNAL (FY08)
- Structure procurement at FNAL (FY08 contingency)
- Assembly using LQ01 coils at FNAL
- Test at 4.5 K and 2.5 K, (1.9K) at FNAL
**LQ03 plan:**
- Structure will depend on LQ01 (LQ02) results
- New coils

- FY08

- FY09

- Nb3Sn Technology Scale-up for LARP

## Coil Fabrication Plans

**I would like 8 coils available for LQ01 **
- Spare set in case of damage to 1st set during magnet assembly or operation (QP failure)
- Spare coils available in case of LQ limited by poorly performing coil(s)
**Two coil fabrication lines (at least Rect&Imp)**
- Avoid risk of long delays in case of equipment failure or reduced availability
- Build larger flexibility for LARP magnet R&D

- Nb3Sn Technology Scale-up for LARP

## Coil Fabrication Plans - II

**$5M cap FY08 plan:**
- 6 coils: Wind&Cure at FNAL
- 4 coils: React&Impr at FNAL
- 2 coils: React&Impr at BNL
- 1 Practice coil at FNAL, 1 Practice coil at BNL
**$1.5M contingency: **
- Use will be considered for Q3 and Q4
- Coils 7 and 8

- Nb3Sn Technology Scale-up for LARP

## Advantages of Proposed Plan

**Larger probability of success**** within FY09 by developing both structures**
- See risk management
**We are building a ****large and unique set of expertise and experimental data**** for the design of the structure for the LHC ****phase-II upgrade**
**All 3 labs are strongly involved with this plan**
-  the best intellectual contribution from all experts
-  very high level of internal scrutiny

- Nb3Sn Technology Scale-up for LARP

## Risk Analysis - I

**The shell-based structure (LQ01) has some  modifications and new features with respect to TQS models. Risks and probability:**
- Failure:		 	Low
- Large experience and expertise with shell-structures and the LRs
- Test with dummy coils (FY08 contingency)
- Limited performance: 	Medium
- Modifications are mainly on the cross-section, and we have a good understanding 2D FEM analysis
- Possible unexpected scale up issues
- Delays:			Medium-High
- Schedule is tight, there are new parts, and some assembly procedures are different from those used for LRS02 and the TQS

- Nb3Sn Technology Scale-up for LARP

## Risk Analysis - II

**LQ02 will use a collar-based structure, TQC models have not exceeded 200 T/m. Risks and probability:**
- Failure:			Low
- Same design and procedures of TQC models
- Limited Performance:	Medium
- All TQC models reached 200 T/m
- The introduction of coil alignment features increases this risk (successful test in future TQCs may reduce it)
- Delays:			Medium-Low
- Same parts and procedures used for TQC models, applied to long coils

- Nb3Sn Technology Scale-up for LARP

## Risk Analysis - III

**The plan to use LQ01 coils in LQ02 has some risks because coils could be damaged or degraded**
- Limited performance: 	Medium-low
- The possibility of TQSTQC coil exchange was successfully proven by TQC01b and TQC02E
- Modifications TQSLQS structure should reduce the risk of permanent degradation (high stress in outer layer)

- Nb3Sn Technology Scale-up for LARP

## Risk Management Features - I

**Collar-based structure**** available by the end of FY08**
- When making plans for FY09 we will be able to assess the status of the shell-based structure and adjust plans in case of large delays
**Availability of ****4 spare coils**** by LQ01 test date provide options in case of limited performance of LQ01:**
- Replace limiting coils and repeat the test
- If limited performance due to some coils
- Move to LQ02 with new coils
- If limited performance due to structure/assembly

- Nb3Sn Technology Scale-up for LARP

## Risk Management Features - II

**Use of coil-alignment features in LQ02 will be ****based on performance**** of LQ01 and future TQC models**
- In case of successful LQ01 we can take more risks with LQ02, otherwise we will be very conservative
**Choice of LQ03 structure will be ****based on LQ01 performance****  **

- Nb3Sn Technology Scale-up for LARP

## Notes

**The LARP magnet R&D has some delays**
- LQ practice coils will be completed in March 08
- No TQ03 series
** ****we still want to meet the 2009 deadline**
****** ****need to invest ****“more” resources**** in the LQ**
- Implemented through the risk management features of the proposed plan
**The “proposed plan” allowed us to start FY08 with a plan**
- We have developed detailed budget, schedule, task sheets

- Nb3Sn Technology Scale-up for LARP

## Schedule & Budget

- FY08 budget (without contingency): $3.4M

-   |          2008               |            2009            |

- Nb3Sn Technology Scale-up for LARP

## Extra slides

- Nb3Sn Technology Scale-up for LARP

## FY08 Long Quad Organization

**LQ raised to L2 area**
**LQ should be a “****projectized task****”**
- Weekly conf-calls to check progress, and discuss problems and next steps
- Task sheets used as MOU between LARP and the Labs.
- Tasks made of sub-tasks with start/end dates, budget, and resources
- Budget officer will generate expected spending profile (M&S and labor at each lab), and compare monthly expenses

- Nb3Sn Technology Scale-up for LARP

## LQ Task Sheets

- Nb3Sn Technology Scale-up for LARP