# Presentation: 587752

## Status Report on Collaboration Work 17 April-2008

- Meeting : April 17 2008
- RRCAT Indore

- A M Puntambekar

- EB welding fixture
- Further planning for 1.3 GHz Single cell cavity
- RRR measurement ( Initial test results)

## Value Engineering Concept

- Electron Beam Welding fixture- ‘Slip Ring Concept”

- Fixture proposed for EB welding of SC cavities.
- May significantly (10%) lower the cost.
- Control of welding distortion possible.

## Design of Welding fixture completed .

- Machining of Fixture is completed at RRCAT workshop.

- Principle applicable for Dumbell as well as Half cell to Beam Pipe welding
- Proof of principle planned on dummy set up  using available turn table

## Completed EB welding fixture 

- Completed EB welding fixture

- Principle seems workingFixture under Trials

- Other fixtures for Single cell cavity under fabrication at RRCAT workshop

## Welding fixture movie

## Rolled Pipes of dummy Aluminum sheetCylindricity achieved 0.6 mm as rolled Desired tolerances achievable at matching faces for welding after machining

- Rolled Pipes of dummy Aluminum sheetCylindricity achieved 0.6 mm as rolled Desired tolerances achievable at matching faces for welding after machining

- Dedicated sheet bending machine for making beam pipe for single cell cavity

- Pipe rolling machine

## Model of Single cell TESLA shape cavity

- End Flange

- Half Cells

- Fixture ring

- Beam Pipe

- Further Planning for Single cell cavity Fabrication- discussions

- Eliminated

- Required tooling getting ready at RRCAT
- 1. Half cell Forming tools & Machining fixtures.
- 2. EB welding fixtures.
- 3. Beam Pipe rolling machine.

## It is proposed that the Necessary forming, machining & welding tooling developed at RRCAT can be used. 

- Raw Material ( Nb & Nb-Ti) for components to be arranged by FNAL.
- Support for forming, machining & welding using facility available with FNAL needed.

- Other supporting stages/ agencies involved
- Cleaning & Rinsing ( A0 – station )
-  Intermediate Frequency measurement ( Timer)
-  Pre weld Etching – MDTL facility
- Other handling fixtures
- Any other missing links ??

- Feasibility of the proposal  ? ,Time schedule- ?
- Availability of time slot wrt existing commitment  ?

## RRR measurement on Niobium samples

- As part of development programme we are in the process of establishing a RRR test facility for Niobium at RRCAT.
- The facility is similar to the facility at FNAL. It uses a dip stick holding the sample & inserting it in to standard LHe Dewar.
- This facility is for measurement of bulk resistivity mainly aimed for gross qualification of vendor material.
- The RRR defined here is the ratio of the resistances at room temperature (300 K) and just above the super- to normal-conducting transition ~10 K.
- In order to calibrate the test set up some reference samples taken from FNAL & CERN were measured again.
- The test results are compared with that of measurements done at RRCAT.
- The test results are summarised in the next slide.

## Slide 10

## This is a beginning of the learning process.

| SUMMARY & COMPARISION OF TEST RESULTS |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
|   |   |   |   |   |   |   |
| S.NO. | source | SAMPLE ID | REPORTED  | RRCAT RESULTS |  | DEVIATION%  |
|   |   | CODE | RRR | TEST 1 | TEST 2 | OBSERVED |
|   |  |  |  |  |  |   |
| 1 | FNAL | Nb/FNAL/Dec-07/15 | 339 | 335 | 323 | 4.70% |
|   |   |   |   | 4-Apr-08 | 7-Apr-08 |   |
| 2 | FNAL | Nb/FNAL/Dec-07/16 | 342 | 352 |   | 2.90% |
|   |   |   |   | 8-Apr-08 |   |   |
| 3 | CERN | Nb/CERN/July-04/05 | 182 | 175 | 170 | 7% |
|   |   |   |   | 30-Jul-04 | 8-Jul-05 |   |
| 4 | CERN | Nb/CERN/July-04/10 | 190 | 185 | 187.7 | 2.60% |
|   |   |   |   | 27-Jul-04 | 29-Jul-04 |   |
| 5 | NFC | Nb/NFC/IC-1/A | * | 34 |   |   |
|   |   |   |   | 11-Apr-08 |   |   |

## Thanks