# Presentation: 612473

## MICE Cooling Channel Magnets:	•	Spectrometer Solenoid Procurement	•	RF Module Coupling Coil Proposal

**Steve Virostek**
- Lawrence Berkeley National Lab

- NFMCC 07 @ UCLA
-  January 31, 2007

## MICE Cooling Channel Layout

**Spectrometer**
**Solenoid 1**

**AFC Module 1**

**AFC Module 2**

**RFCC Module 1**

**RFCC Module 2**

**Spectrometer**
**Solenoid 2**

**AFC Module 3**

## Spectrometer Solenoid Overview

**Order for two spectrometer solenoid magnets was placed with Wang NMR by LBNL in June ‘06**
**Design review was held by Wang on Sept 6, 2006**
- Complete design package book provided to LBNL
**Detailed magnet design is now complete**
**Superconducting wire was provided by LBNL (IIT)**
**First machined coil former completed last week**
**Coil winding will begin within two weeks**
**First magnet scheduled to be shipped end Aug 07**

## The spectrometer solenoids provide a uniform field for the scintillating fiber tracker & match the uniform field section into the rest of MICE
The long center coil with its two short end coils are designed to generate a 4 T field
Field uniformity is better than 0.3% over a 1000 mm long, 300 mm diameter region
Uniformity is better than 0.1% over most of the region

**The long center coil with its two short end coils are designed to generate a 4 T field**
- Field uniformity is better than 0.3% over a 1000 mm long, 300 mm diameter region
- Uniformity is better than 0.1% over most of the region

**Purpose of the Spectrometer Solenoids**

## MICE Field on Axis in the Flip Mode

**Spectrometer Solenoid**
**on Axis Field**

**MICE Field on Axis in the Flip Mode**

## Spectrometer Solenoid Cold Mass

**End Coil 2**

**Center Coil**

**Match Coil 1**

**End Coil 1**

**Match Coil 2**

**Coil Cover**

**Liquid Helium Space**

**490 mm**

**690 mm**

**2544 mm**

**Coil Spacer**

**Spectrometer Solenoid Cold Mass**

## First Completed Coil Winding Form

**First Completed Coil Winding Form**

## Spectrometer Solenoid Conductor 

**1.00 mm**

**1.65 mm**

**41 ********m Nb-Ti**
**222 Filaments**

**RRR > 70 @ 4.2 K**

**Spectrometer Solenoid Conductor **

**Cu/SC = 3.9 ± 0.4**
**Twist pitch: 19±3 mm**
**121.5 km purchased**

## Design Overview (coil construction)

**Each layer wet wound using Stycast 2850 FT**
**2.5 mil thick fiberglass between winding layers**
**Aluminum coil banding will provide hoop force support and ensure coils are tight after cooldown**
**Conductor joints are to be lapped by at least 24” to minimize the I****2****R losses**
**Passive quench protection will be provided by a system of diodes ****&**** resistors**

**Design Overview (coil construction)**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Cold Mass Support System (50 T axial force)

**300 K Support End**

**60 K Support Intercept**

**Support Band**

**4 K Support End**

**Cold Mass Assembly**

**Cold Mass Support System (50 T axial force)**

## Lead Neck

**Lead Neck**

**He Gas Pipe**

**4.2 K Coolers**

**Condenser Tank**

**Liquid Pipe**

**Cold Mass**

**4K End**

**60K Intercept**

**300K End**

**Cold Mass Support**

## Design Overview (coil cooling)

**Baseline design will use two cryocoolers but will allow mounting of a third cooler, if necessary**
**High T****C**** leads will be accessible by means of a removable cover plate**
**60K (or less) thermal shield is conductively cooled using the first stage of the cryocoolers**
**Thermal shield copper mass will protect the high T****C**** leads ****and**** provide extra cooling margin**

**Design Overview (coil cooling)**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## He Filler Neck

**He Filler Neck**

**Lead Neck**

**Cold Mass Support**

**PMT Iron Shield**

**Space for Radiation Shield**

**Support Stand**

**Cooler Neck**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Design Overview (PV’s & supports)

**He vessel will contain two relief paths for safety**
**Unidirectional S-2 fiberglass cold mass supports using race-track shaped links (safety factor of 4)**
**304 SS support design derived from LBNL/Oxford**
**Cold mass support design allows cold shipping**

**Design Overview (PV’s ****&**** supports)**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## MICE Scintillating Fiber Tracker Module

**The Blue rings are the tracker scintillating fiber planes. Plane spacing: 150mm, 180mm, 200mm and 470mm.  All fiber planes are in the magnet good field region.**

******B/B = ±0.105% at R=0, L=1050 mm**
******B/B = ±0.262% at R=150 mm, L=1050 mm**

**MICE Scintillating Fiber Tracker Module**

## Estimated Heat Loads

**The magnets can be cooled with a pair of 1.5 W pulse tube coolers**
**The temperature of the cooler first stage is about 52 K instead of 60 K**
**Given the temperature margin, the magnets can operate at 4.5 K**
**The peak field at the cooler rotary slide valve is about 0.05 T**

**Estimated Heat Loads**

## Magnet Coil Load Lines

**Margin @ 4.2 K:**
**M1 = ~1.7 K**
**M2 = ~ 1.9 K**
**E1 = ~ 1.6 K**
**C = ~ 2.0 K**
**E2 = ~1.5 K**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Quench Protection & Power Supply Hookup 

**Quench Protection ****&**** Power Supply Hookup **

## Pulse Tube Cryocoolers

**Magnetic field at the cooler rotary valve motors is ~0.05 T (no iron shielding needed on the valve motors)**
**Cryocoolers (up to three) can be installed and removed without breaking cryostat vacuum**
**Coolers connected to He liquid bath w/a thermal siphon heat pipe to reduce ********T between coil ****&**** cooler 2****nd**** stage**
**Four Cryomech 1.5 W pulse tube coolers ordered by IIT – first unit shipping to Wang on February 19th**

**Pulse Tube Cryocoolers**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Magnet Power Supplies

**Three power supplies of +300 A at ±10 V for the center and two match coils (shared for 2 magnets)**
- two quadrant power supply
- current regulation of < ±0.01% from 50 A to 275 A
**Four power supplies of ±50 A at ±5 V for the two end coils (2 per magnet)**
- four quadrant power supply
- current regulation of < ±0.03% from 5 A to 45 A
**Power supply specification is complete**
**Lead time is 3 months – order to be placed soon**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Schedule Summary

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Summary

**1****st**** coil former arriving at Wang this week**
**High T****C**** leads will arrive early February**
**Cryomech cryocoolers (4 each) on order**
**Power supply spec is complete – order soon**
**First magnet to be shipped by end Aug 07**
**Second magnet to follow 1 month later**

**Summary**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## MICE Coupling Coil Fabrication Plan Proposal

- Lawrence Berkeley National Laboratory (LBNL)
- Institute of Cryogenic & Superconductivity Technology (ICST)
- at the Harbin Institute of Technology

## Progress towards LBNL/ICST Collaboration

**Scope: design, fabricate and test one MuCool coil and two MICE coupling coils**
**Preliminary discussions began last year**
- Mike Green visit to ICST 4/06 and at MICE CM15 & CM16
** ****LBNL visit to ICST at Harbin in December ‘06**
- Attendees: M. Zisman, D. Li, S. Virostek, M. Green
- ICST presented preliminary coupling coil designs
**Design work is continuing by ICST engineers**
**Unresolved issues: level and sources of funding**

## MICE Cooling Channel

## MICE RF Cavity & Coupling Coil Module 

**Coupling**** Coil**

**MICE RF Cavity ****&**** Coupling Coil Module **

## RFCC Module Cross Section

**RFCC Module Cross Section**

**RF Cavities**

**8” Cryopump**

**Pulse Tube **
**Cryocooler**

**Coupling Coil**

**Vacuum**
**Manifold**

**RF Cavity**
**Vacuum**
**Vessel**

**Notes:**
Highlights 
* UHV
Tunable
Windows, or grids

## Goals of the ICST/LBNL Collaboration

**Develop a coupling coil design for MICE, MuCool**
- Preferably one design that meets both project’s needs
** ****Fabricate and test three coupling coils at ICST**
- Coil for MuCool is needed as soon as possible
- Two MICE coils can follow later (if appropriate)
**Integrate the coil design with the requirements of the MICE RF/Coupling Coil Module**
- Issues: RF vacuum vessel, RF couplers, tuners, forces

## LBNL Role in the Coil Development

**Develop engineering concept ****&**** initial analysis**
**Specification of coil parameters ****&**** requirements**
**Provide project oversight and design approval**
**Procurement of superconductor, cryocoolers, leads, power supplies, etc. for all three coils**
**Funding to ICST for added cost of MuCool coil**
- Additional material: coil winding form, cryostat, coil vacuum vessel, MuCool coil support structure

## ICST Role in the Coil Development

**Perform engineering analyses and detailed design of the MICE/MuCool coupling coil**
**Fabricate ****&**** test one MuCool coil with funding, material and components provided by LBNL**
**Provide effort and material to complete the fabrication and testing of the two MICE coils**
**Contribute to the collaboration by reporting progress at MICE meetings and in publications**

## Coupling Coil Specification (LBNL)

**General system description**
**Applicable codes and standards**
**Coil parameters and requirements**
**Inspection and testing plans**
**Packing, shipping and handling**
**List of LBNL furnished materials**
**Quality assurance requirements**
**Conceptual design drawings**

## Coupling Coil Design Review

**Coupling coil design review to be held by ICST**
- Attendees: LBNL, MICE collaborators, other experts
- Complete design package documentation to be provided
- Follow up on issues & actions items identified in review
**Present engineering analyses and calculations**
**All fabrication drawings ready for review**
**Fabrication and assembly plans and procedures**
**Coil test plans: electrical, thermal, mechanical**
**Quality assurance and process control plans**

## ICST Coupling Coil CAD Model

**ICST Coupling Coil CAD Model**

**Cryo-cooler**

**Helium vessel**

**Vacuum vessel**

**LHe piping**

**Cool-down supply piping**

**Supports**

**VHe piping**

**Cool-down return piping**

**Vacuum port**

**Bayonets**

**Leads**

**Recondenser**

## Coupling Coil Components (ICST)

**Cryo-cooler**

**Winding form**

**Support band**

**Insulation**

**Thermal Shield**

**He vessel cover**

**Coil windings**

**Vacuum vessel**

**Cold mass supports**

**Leads**

## Cooling Circuit Details (ICST)

**Cooling Circuit Details (ICST)**

**Cryo-cooler**

**LHe piping**

**Cool-down return piping**

**VHe piping**

**Cool-down supply piping**

**Bayonets**

**Leads**

**Recondenser**

## Cryocooler and Condenser Details (ICST)

## Helium Vessel Thermal Analysis (ICST)

**6061-T6 Al**

**6061-T6 Al**

**4.2K**

- The coil is cooled by conduction with liquid helium.

## Helium Vessel Stress Analysis (ICST)

**25mm thk**
**aluminum**

**Supports**

**Radial, longitudinal and gravity forces and 4 bar internal pressure. **

## Coupling Coil Magnetic Field Analysis (ICST)

**B****max**** = 6.58T (ICST analysis), B****max**** = 6.51T (MICE conceptional design)**

## MICE Channel Magnetic Field (ICST)

**Flip Mode (Case1)**

## ICST Proposed Coil Winding Facility

## Project Deliverables from ICST

**Design package containing fabrication drawings**
**One MuCool coil with dedicated support (ASAP)**
**Two coupling coils for the MICE Project**
**Fabrication process documentation**
**Magnet testing documentation**
**Coupling coil project final report**

## Timeline – Early MuCool Coil Delivery

## Proposed Fabrication Plan Summary

**LBNL to provide design concept ****&**** specification**
**ICST to develop detailed coupling coil design**
- Engineering analyses and design drawings
- Design review to be held prior to fabrication
**LBNL will supply some components and material**
- Superconductor, cryocoolers, power supplies, etc.
**ICST will fabricate and test the coupling coils**
**LBNL will oversee the design and fabrication**