Category Archives: general

sample environment

PEARL will have a small OxfordInstruments cryostat available from day-1 of operation. It’s expensive to run the cryostat (consumption of He) and a CCR is to be ordered soon. Besides that, sample environment will grow gradually as the instrument is being used over the years. The instrument allows for a 400mm radius sample environment.

The first Vanadium sample can laser-welded to a Ti-V flange. If vacuum-tight, more can will go into production.

The first Vanadium sample can laser-welded to a Ti-V flange. If vacuum-tight, more can will go into production. Special thanks to Esteban, Rien and Raymon!

5 detector banks installed

we have 640 pixels operational at the moment, so we are doing prelimenary tests with those, comparing PEARL to other instruments, the original simulations of 2010, etc, etc. The remaining 6 pixel banks should be ready in the next few weeks. We should soon have a good estimate on how close we are to the transition “building -> running PEARL”.

bank 1 wired

Next week the bank on the right will be tested with neutrons. In the meantime, Fred is soldering and wiring the remaining 10.

Next week the bank on the right will be tested with neutrons. In the meantime, Fred is soldering and wiring the remaining 10.

PE shielding done

neutron shielding for the detector

neutron shielding for the detector

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detector with complete set of pixels

This week we align the 1408 detector pixels, the banana-shaped light tight box and the shielding, all centered on the sample position.

All 11 pixel banks inside the banana-shaped box.

All 11 pixel banks inside the banana-shaped box.

first detector bank installed

The first 128 pixel bank installed in the detector housing. Still 10 banks to go, but we now can already test the background levels due to light leaks of the detector housing.

Top picture: The first 128 pixel bank installed in the detector housing. Still 10 banks to go, but we now can already test the background levels due to light leaks of the detector housing.

Bottom picture: the detector housing closed for testing its light-tightness.

detectorClosed

detector housing in position

today we placed the "banana shape" detector at its final location around the sample position. You can see an illuminated monochromator "well" in the concrete shielding, the Leica distance laser on the sample position at the alu table and then since this afternoon the "banana box" with the 11 connector plates for the pixel banks.

today we placed the “banana shape” detector at its final location around the sample position. You can see an illuminated monochromator “well” in the concrete shielding, the Leica distance laser on the sample position at the alu table and then since this afternoon the “banana box” with the 11 connector plates for the pixel banks (and Ernst celebrating this joyful event).

fiber art

Raymons months of fiber encoding in one snapshot, by Kees and Piet.

Raymons months of fiber encoding in one snapshot, by Kees and Piet.

PEARL “in the lift”

A Dutch expression “in de lift zitten”, could be losely translated as “a rising star”. Fred is moving the detector banks from the lab to the instrument: we will install the detector mechanics+shielding this week. Next week we foresee to have half of the detector banks installed, with the other half being installed in March. In the mean time we have been working on the commissioning of the instrument: background reduction, monochromator crystal alignment and some first (promising) measurements diffraction patterns.

One of the 11 detector banks ready for installing in the PEARL detector.

One of the 11 detector banks ready for installing in the PEARL detector.

detector assembly

light-tight detector 'banana' installed in the shielding (of which the roof and front are missing in this picture).

light-tight detector ‘banana’ installed in the shielding (of which the roof and front are missing in this picture).