HIRADMAT tungsten powder experiment Presented by Ottone Caretta Presented by Ottone Caretta

Tunnel layout and Optics Nikos to comment..

LEDs Soon to come test of the LEDs to determine the best layout in the rig. We would like to test the CERN HSV camera with the LEDs and the windows in the rig to see if they produce enough light and/or generate reflections

Translation stage The translation stage to swap between the 3 experiments has been purchased and commissioned including also a test 150m cable to simulate losses in the wiring

5 160mm Visible trough length (all toughs) Trough with re-setter 2 x open troughs divided by glass barrier Enclosed samples LDV calibration piezo crystal 15mm Enclosed sample length Sweeper/experiment layout

6 Updated layout – Feb 2015 Field of view – high-def. camera Field of view – high-speed camera LDV spots Electrical feedthrough

HiRadMat powder leveller Powder troughs Proposed powder levelling device 7

Constraints Physical constraints: The powder trough is approximately 20mm wide, with a sweeper paddle/brush of matching diameter. In the current design there is ~12mm of available space above the trough for a linear stage or worm drive to propel the sweeper and rotate it. There My be scope to enlarge this gap slightly, but it should be kept as small as possible. There is a large area of 165mm long x 111mm wide x 46mm deep’ up-stream of the target for drive motors, gears and mounting components. There is also a space of ‘57mm long x 111 wide’ x 46mm deep’ for mounting components at the down-stream of the sample. The stroke length of the sweeper is ~160mm. Refer to further dimensions on the following pages Electrical constraints: The controller will be operated by a user in a control room, some 150m away from the linear stage itself The 150m control/power cable is limited to 50v and 3A 22 electrical pins are available through the electrical feedthrough Environment: The trough will be exposed to short pulses of radiation, which affect the choice of materials and the electrical control. Electronics should be avoided, and a simplistic analogue electrical system is preferred Use of plastics, rubbers and lubricants should be agreed before use. In general, metallic components are preferred. 8

Draft Specification Please quote for the following: –Linear and rotary drive, independently controlled, to fit within the allowed envelope –All motors, gears, bushes and bearings –Controller to control linear drive between two end stops (limit switches). Speed control preferable. –Controller to control rotary motion of sweeper. Note – the sweeper shall be capable of rotating both when the liner drive is in operation, and when it has stopped. –Limit switches set up for one-off adjustment Other information: –Linear and rotating drive shall be of sufficient torque to allow sweeper to perform it’s function (to be discussed in more detail). –Materials should be “reasonably” radiation hard (for further discussion – note – these components will only be subject to radiation for a duration of ~1 week) –Linear drive speed – not critical – can sacrifice speed for torque on a smaller motor. Ideally linear speed adjustable from half a full stroke/minute – 2 full strokes/minute –Rotary motion speed adjustable from 60 – 250 rpm –Design may vary dramatically from that of the concept outlined, provided it fits within the specified envelope. Motor (for linear motion) Guide rods Motor (for rotary motion) Lead-screw (linear motion) Worm screw (rotary motion) Worm gear Sweeper brush/paddle Guide rods 9

10 Inner container modifications re-set trough, re-setter and electrical feedthrough all mounted to a removable side plate

11 Side plate assembly/envelope and ideas Linear and rotary drive motors Linear stage with rotating head Resettable trough with glass sides Electrical feedthrough Approximate envelope (see following slide for details and dimensions)

12 Sweeper envelope

Sweeper tests Brass or nylon brushes work well and any of the “gun cleaning” shapes seems effective. Surface of the tungsten is as flat as could be expected on a hand-held test and possibly good enough to reset the experiment. Would nylon survive the dose we are expecting? Not much time left to finalise/purchase the mechanical stage.

Project task list & schedule

Questions -Laser time stamp -Mirrors and windows reflections in HSV and LDV -Does the LDV have an aiming camera?! -LDV test with piezo in the box?