# Presentation: 004635

## PD Magnets Update050505

** ****Organization****	**
** ****Requirements/specifications/decree****	****s**
** ****Draft Plan****	**
** ****Overview**
** ****Solenoids**
** ****Quadrupoles**
** ****Magnetic Measurements**
** ****Cold Test Systems**

## Organization

**Task structure (approximate)**
**Lead Engineer – TBD**
**Integration desperately needed!**
**Solenoids – I. Terechkine, Va. Kashikhin**
**Quadrupoles – Vl. Kashikhin**
**3D Magnetic Design – TBD (Vadim over committed) **
**Magnetic Measurements – J. DiMarco, C. Ginsburg**
**Cold Test Engineering – (C. Sylvester)**
**Technician – TBD**
**Design/drafter – TBD**

## Organization, cont.

**Meetings**
**Typically Tuesdays 10:00 am (almost weekly) but dependent on local schedule chaos**
**Meeting materials, minutes, supporting documents, etc.**
**\\TDSERVER1\project\8GeVLinac\PD Magnets**
**Menu: **_**[PD Magnet ](file:///PD%20Magnet%20Meetings.html)**__**[Meetings.html](file:///PD%20Magnet%20Meetings.html)**_
**Project related issues**
**Specifications are changing**
**Parameter List (March 2005) is obsolete**
**Some modestly more formal coordination, integration and tracking mechanism is needed **
**Budget codes for procurements needed**

## Specifications, Requirements, etc

**Magnet Specifications from G. Romanov****050419**

## Specifications, Requirements, etc, cont.

**Strength**
**TBD (assume “loose” ******** ~per cent ?)**
**Field Quality**
**“****Loose” ******** ~per cent**
**Needs some additional scrutiny**
**Note: for iron dominated magnets (quadrupoles) strength and field uniformity should be very manageable**
**Dipole Trims**
**TBD (no applicable requirements to date)**
**Alignment**
**TBD (no applicable requirements to date)**

## Specifications, Requirements, etc., cont.

**Stray Field**
**<10********T is ‘challenging’ ******** shielding required**
**Present cold solenoid design constraints do not have a magnetic solution that meets all requirements simultaneously...**
**SSR section solenoid does not have sufficient margin (****≤****10%)**
**Alternative approach would use Nb****3****Sn insert (inner coil) **
**More challenging technology**
**Schedule uncertain, definitely longer**
**Cost increase**
**Structure more complicated**
**RT solenoid specs have changed(?) – design needs review; higher field requirement implies margin will change**

## Draft Plan

**Overview**
_***Short term plan (a)***_**:**** RT solenoid (less difficult)- design, fabricate and test – to verify technology before SSR solenoid (6T) (more difficult) for use in SMTF commissioning test**
_***Short term plan (b)***__***:***_*** *****design, fabricate and test quadrupole (15T/m) for use with triple spoke and higher beta cavities**
**Short term plans are for a period of about one year – 16months, starting now**
_***Long term:***_**	****	****115(156) quadrupoles - 4/5 configurations (TBD)****	****53 solenoids – 3 configurations**** **

## PD Magnets – Solenoid Plan

**Solenoid Design, Prototype (Iouri) **
**Study wire and winding properties; insulation; impregnation; build ‘engineering study’ solenoid model to determine design parameters**
**Develop full magnetic and mechanical design that meets the specifications and allows convenient assembly and stress management.  Key to this is the choice of wire and insulation system.**
**Define assembly technology and method of applying pre-stress**
**Make stress calculations for all stages of assembly and thermal cycling.**
**Start magnet and tooling design.**

## PD Magnets – Quadrupole Plan

**Quadrupole Design, Prototype (Vladimir)**
**Study wire and winding properties; insulation; impregnation; build ‘engineering study’ quadrupole  model to determine design parameters**
**Define quadrupole prototype specification.**
**Develop quadrupole conceptual design, including 2D magnetic, mechanical, thermal calculations, quench protection, power supply parameters.**
**Superconductor choice and specification.**
**3D quadrupole end field calculations with ferromagnetic shields.**
**Quadrupole prototype and tooling drawings.**
**Purchase parts and superconductor. **
**Assemble 2 prototypes.**

## Magnetic Measurement Plan

**Magnetic Measurement Activities**
**Field Strength/Field Quality**
**Solenoids:**
**Develop small form factor 3-D Hall array with fixturing, drive system, etc.**
**Calibration techniques (reference magnets)**
**Develop reconstruction/analysis code for solenoid field evaluation**
**Axis measurement with SSW(?) – studies needed**
**Quadrupoles:**
**Determine coil availability to meet aperture and length requirements**
**Evaluate fixtures needed for SSW measurements**
**For both:  evaluate warm measurement possibilities – current limits, sensitivities, AC/pulsed powering schemes.**

## Magnetic Measurement Plan, cont.

**Low Field Magnetic Measurements**
**Measurements in the μT range**
**Stray field limits 1 – 10μT ******** small compared to background (earth’s field ~50μT)**
**Devices – at least two approaches (systems)**
_***Fluxgate magnetometers:***_**commercially available as systems ~10k$**
_***Magnetoresistive sensors:***_**sensors available Philips, Honeywell; systems costs ~10k$; local experience K. Carlson (AD) electronics; H. Glass, measurements**

## Cold Test Systems Plan

**Cold Test Systems**
**Short term - modifications to Stand 3 dewar**
**Modify top plate**
**Presently being modified for Tevatron corrector test**
**WBT port for measurement access**
**HTS current leads ~800A (max?); use ‘conning tower’ for Tev correctors in short term (?)**
**Instrumentation wiring – quench heaters(?), quench protection voltage taps(‘center tap’ for noise reduction), etc.**
**Use corrector power supply system (400A max)**
**Long term – test cryostat for Stand 2?**

## Magnetic Shielding

**Background fields **
**Earth’s field**
**Local structures (iron in the vicinity)**
**Mu-metal**
**‘****Standard’ for room temperature applications**
**“****Cryoperm”**
**Mu-metal for low temperature use**
**Vendor information (from C. Sylvester)**
**Cryoperm is specially processed mu-metal**
**Cryoperm is costs more (considerably?)**
**Mu-metal, in layers, can be used at low temperature**

## JLab Shielding Example