# Presentation: 132797

## LARP Phase II Secondary Collimator RC1

- Collimator Test Program

## LARP Phase II Secondary Collimator RC1Collimator Test Plan

- Near term
- Jaw/Cooling Tube Joint Development
- Single Jaw Thermal Tests
- Later this year......
- Design and fab hardware for Mechanical Prototype Tests

## Jaw/Cooling Tube Joint DevelopmentPurpose: determine appropriate joint configuration & fabrication methods

- In process.. target completion date
- Square hollow magnet conductor for first test ~ 9 mm x 9 mm
- Copper jaw and mandrel
- Cu-Au braze
- After first braze, machine coil o.d. for correct fit to jaw i.d.
- After second braze, section assy to inspect coverage
- Round tubing with grooved (?) mandrel is next

- May 9th
**                 ****Cooling Tube  **
**     ****Jaw                              Center Mandrel**

- ~100 mm

- ~70 mm
- dia

- ~100 mm dia

## Development/Test Lab

| Item | availability |
| --- | --- |
| Chiller | existing |
| Vacuum equip’t | SLAC misc? |
| Heater controller | select/buy |
| Gantry | select/buy |
| Tools, table | select/buy |
| Instrumentation | select/buy |
| Power/water | to be installed |

## Single Jaw Thermal Test

- Purpose: measure cooling effectiveness and thermal deformations
- Current focus: purchase long lead items concurrently with FEA predictions and mechanical design of required test hardware.
- Next Milestones: Copper Jaw...  target is mid June
-                             Experiment hardware & test set-up...target early is July
- Internal helical cooling tube
- Collimator midpoint stop and flexible end supports
- Commercial electric resistance heaters, coupled with thermal grease
- SS power ~10 kW, evenly distributed
- No transient testing
- FE model test => validation of simulations
- No Jaw rotation
- Perform test under inert gas, insulated in air, or under vacuum...TBD

## Single Jaw Thermal Test setup

**Reference bar, water cooled to maintain straightness (radiation shield ?)**

**Standoffs fix jaw distance to reference bar at center**

**Capacitive proximity sensors at ends**

**Flexible end mounts**

**2 x 5 kW heaters, coupled with thermal grease**

**Orientation: may be rotated 90****o,**** or 180****o**** or on end**

**Thermocouples measure temperature distribution**

**Water cooling**

## Single Jaw Test Thermocouple Locations

**Thermocouples recessed into Jaw slightly below the surface **
**Spaced along Heater length and around Jaw circumference**
**Should yield the Jaw heating profile predicted by the FE analysis**

**12 x Thermocouples**

**2 x 5kW Heaters**

## RC1 Mechanical Prototype Test

- Purpose: bench top testing of the jaw actuating mechanism in CERN orientations
- Current Focus: Preliminary engineering definition, system analysis & sizing of components. Target completion ..... mid June
- Next Milestone: Engineering drawings/detailed design. Target.. Dec
- CERN adjustment mechanism used
- Add’l CERN Phase 1 components as appropriate
- Vacuum tank with easy access
- Realistic cooling water feed-throughs and flexible connections
- Simplistic control system for jaw aperture and rotation
- Minimal instrumentation connections for position, temperature, etc.
- Probably no heat loading

## RC1 Mechanical Prototype

**FY08, RC2**

**FY07**
**RC1 consists of jaws, tank & actuators - evaluated for horizontal (shown), vertical (90****o****) and skew (+/- 45****o****) orientations.**

**Variant: use CERN vac tank, dummy jaws of correct weight**