1. Status of the Mechanics at Ciemat.
Enrique Calvo Alamillo
Double Chooz collaboration meeting at Oxford

2. Double Chooz collaboration meeting at Oxford
Index
Status of the tools being built at ciemat.
Fully equipped PMT pressure test.
Lastest proposal of the PMT mechanical support.
Last distribution of the PMTs on the Buffer.
Next steps.
Double Chooz collaboration meeting at Oxford

3. Double Chooz collaboration meeting at Oxford
Status of the tools being built at ciemat (1).
Manufacture of the following tools is in progress at CIEMAT workshops (according to the drawings supplied by Patrick Perrin, J.François Millot and Loris Scola)
One tool unit for the gamma catcher.
Two rotation tools units.
Will be ready in a couple of weeks. Expected
to be delivered to Saclay by end of October.
Ready. To be delivered to
Saclay by end of October.
Preassembly and verification of these tools is planned at CIEMAT during the first week of October. Engineers from Saclay will participate in this process.
Double Chooz collaboration meeting at Oxford

4. Double Chooz collaboration meeting at Oxford
Status of the tools built at ciemat (2).
Three tool units for the target.
One tool unit for the transport.
Will be ready by end of November or beginning of December.
And delivered to Saclay during January.
Will be ready by end of November or beginning of December.
And delivered to Saclay during January.
Double Chooz collaboration meeting at Oxford

5. Double Chooz collaboration meeting at Oxford
Status of the tools built at ciemat (3).
Photos of the status of the different tools:
-Tool unit for the gamma catcher.
Double Chooz collaboration meeting at Oxford

6. Double Chooz collaboration meeting at Oxford
Status of the tools built at ciemat (4).
Photos of the status of the different tools:
-Tool unit for the gamma catcher.
Double Chooz collaboration meeting at Oxford

7. Double Chooz collaboration meeting at Oxford
Status of the tools built at ciemat (5).
Photos of the status of the different tools:
-Rotation tools units.
Double Chooz collaboration meeting at Oxford

8. Double Chooz collaboration meeting at Oxford
Plans of the pressure test (1).
Infrastructure needed will be ready by the end of September.
Double Chooz collaboration meeting at Oxford

9. Double Chooz collaboration meeting at Oxford
Plans of the pressure test (2).
We are planning to do tests with a PMT, fully assembled with mechanical support structure and magnetic shielding, inside a box which we will fill with oil. In this box we will provide enough pressure to simulate the conditions that the system will have in Double Chooz.
The level of pressure, in the worst case at the detector will be aprox 0,5 kg/cm2, which we will obtain by using an oil column of 7 meters high.
The box will have an acrylic transparent door so that we can observe if there are any effects.
We plan to verify the PMT´s with different orientations (5 are foreseen).
And maybe perform a long term test.
We should be able to appreciate deformations, or movements, of the supports at the level of milimeters by simply having some reference marks in the walls of the box.
Suggestions to make other tests with this system are welcome.
Double Chooz collaboration meeting at Oxford

10. Lastest proposal of the PMT supports (1).
This proposal is in agreement with the concentrator and shielding requirements.
-Magnetic Shielding Ø 300 mm.
-Distance from the top of the PMT to the Magnetic Shielding is 55 mm.
One prototype is under fabrication in the workshop and will be ready on next week (will be used in the pressure test).
Double Chooz collaboration meeting at Oxford

11. Lastest proposal of the PMTs support (2).
Double Chooz collaboration meeting at Oxford

12. Lastest proposal of the PMTs support (3).
Double Chooz collaboration meeting at Oxford

13. Double Chooz collaboration meeting at Oxford
Lastest distribution of the PMTs on the Buffer.
This picture summarized the lastest distribution of the PMTs studied with the MC simulation.
From the point of view of the integration this distribution have interference problem on those three positions.
This imply that it is necessary move the theoretical position of the PMTs on those point as minimum as possible.
Double Chooz collaboration meeting at Oxford

14. Double Chooz collaboration meeting at Oxford
Next steps.
With the optimal PMT distribution from MC simulation, finalize the PMTs support structure on the Buffer.
Design of the mechanical devices to permit machine/weld the different fixation points on the buffer with the acceptable tolerance.
Optimize the fabrication process of the different mechanical PMT support pieces.
Detailed step by step Cleaning Procedure for the PMT mechanical support pieces, following the TDR.
Define the assembly procedure for the PMTs support pieces.
Define installation process of the PMTs on the buffer.
Define the tooling necessary for those Jobs.
Define the Space Requirements to do the previous task.
Pressure test at Ciemat during October.
Double Chooz collaboration meeting at Oxford