Test Beam May

TILT SETTINGS

Default telescope configuration

In arm 1: plane 2 is rotated by 90 degrees

In arm 2: the entire arm itself is rotated, and in addition plane 5 is rotated 90 degrees.

Tilting planes

In principle, any plane could be tilted. However, it does not make sense to tilt plane 2 and plane 5, since they are rotated, you would tilt in the large pixel direction. Therefore, when tilting is applied, is only done in plane 1, plane 3 for ARM1 and plane 4, plane 6 for ARM2.

0° tilt

No changes. See the "Default telescope configuration" to understand the planes configuration/rotations.

15° tilt

To understand why not all the planes are tilted please read the “Tilting planes” section, before going ahead.

ARM1:

Plane1 is tilted 15 degrees (to the first screw) following the beam direction.

Plane3 is tilted 15 degrees (to the first screw) against the beam direction.

ARM2:

Plane4 is tilted 15 degrees (to the first screw) following the beam direction.

Plane6 is tilted 15 degrees (to the first screw) against the beam direction.

30° tilt

To understand why not all the planes are tilted please read the “Tilting planes” section, before going ahead.

ARM1:

Plane1 is tilted 30 degrees (to the second screw) following the beam direction.

Plane3 is tilted 30 degrees (to the second screw) against the beam direction.

ARM2:

Plane4 is tilted 30 degrees (to the second screw) following the beam direction.

Plane6 is tilted 15 degrees (to the first screw) against the beam direction. Note: Mechanically not possible to tilt 30 degrees

QUADRUPOLE SETTINGS

The are two quadrupoles before our area, by modifying the current of both the beam can be tuned.

ALIGNMENT SETTINGS

Here the alignment interventions are summarized. All of them were taken with the first beam, and keep it the same for all the tilt configurations.

DISTANCES SETTINGS

DAILY ACHIVEMENTS - Notes

Wednesday 13th May

1. The telescope was commissioned and properly working before leaving the lab.
2. The telescope was succesfully installed in the H8 PPE158 (just in front the magnet).
3. The safety check was passed without any problems. Experiment&responsable form(see in attachments) needs to be on the door, as well as electrical, magnet... cautions paper.
4. The telescope was aligned while installation with the Geneva laser.
5. After the installation, the telescope was commissioned from the control room with CalibGui. Digital and analog scans were performed for all the planes.

Thrusday 14th May

1. During a period without a beam the telescope was tunned using the SBM primlist "/home/testbeam/AIDA/primlists/SBM_fast_tune_3000e_2500e_9tot_16ke.pl". Note that the telescope should be tuned before coming to the testbeam. From the tune you will get a proper top configuration to be used in the CosmicGui.

2. The current of the quadrupoles located in front of us was set in a way to allows us to have a wider the beam spot.

3. The telescope was well align and centered to the beam. Holes have not been drilled from the telescope baseline to the aluminum table, since we needed to higher up only one of the arms.

4. It has turned out that not all planes are perfectly aligned/centered (to be fixed in the next testbeam-->increase/decrease the spacer). We are triggering on all six modules with AND logic (using HB1 and HB2), which means that you only see events with hits in ALL six modules. Due to the rotations, not all modules cover the same area and this results in what you can see in the attached plot (in a first view it looks like a kind of “mask”). However, as we are pretty much centered, the effect is the minimum to live with.

(Example plot: Plane 1 for 0 degrees tilted)

Friday 15th May

1. Data have been taken for the following configurations: 0 degrees tilt, 15 degrees tilt and 30 degrees tilt. Bellow you can see a plot of plane 1 in the three configurations mentioned before respectively. As you can see, as much a you tilt as much dead area (less overlapping area between planes) you get.

LOGBOOK

https://docs.google.com/spreadsheets/d/1KtN1rqetlRT-OfM_vzDGWIztM02PboU_Il0DC9bCKyE/edit#gid=0

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-- SoniaFernandez - 2015-05-15