1. Project planning and status (May 2018)
PANDA pellet tracking
Project planning and status (May 2018)
Ongoing: Multi-camera r/o, control, monitoring and analysis developments.
Preparation of a “generator” tracking chamber that can house four measurement levels. All hardware details for the chamber are ready for assembly in June.
Time line: Tests of a measurement level module (DM) prototype were done 2016.
Tests of the “generator” tracking section start in autumn
Design of the “dump” tracking section. It depends on mechanical design of the target dump area and on experience from cluster-jet tests at COSY.
To be able to prepare the complete system with two tracking sections, additional funding is needed. Then it may take only a few years if some of our expert personnel (and infrastructure) is still available.
Risks: Evaluation done (Autumn 2013 (TDR), Feb 2015 (SG) ).
Funding: Consumables and running: Almost zero HPH2020 application will be submitted 2018 …. (?)
Equipment: CTS grant (20k€) New application was submitted.
Multi-cam s-w slow progress due to lack of manpower.
SG 2015 comment still valid: “Funding remains an open problem”. The pellet tracking project is not in the PANDA cost book and it is not a Swedish FAIR in-kind contribution. It can therefore not get part of the dedicated SRC support for PANDA. We see therefore no possibility for substantial financing at present. The special problem with funding should be well known since many years by the PANDA management.
CTS = Carl Tryggers Stiftelse (a private foundation), SRC = Swedish Research Council, HPH = Hadron Physics Horizon,
DM = Detection Module

2. Tests of “Pellet Tracking” with PANDA Cluster-jet at COSY
The PTR system will provide jet (x,y) position, shape and detailed variations on different time scales, possibly down to 20 microsec.
Some differences between cluster-jet and pellet-stream that the system has been adapted for:
1) size at accelerator pipe about 13 mm compared to 3 mm
2) time structure continuous on the scale of microseconds
3) optical properties i.e. light reflection and transmission
Also to some extent how to treat the camera image information.
The present UPTS tracking chamber with two measurement levels will be used together with ....
... two DMs each equipped with one LS-camera and one STR-laser at 90 degrees, both with modified optics to cover the jet completely.
Compared to a monitoring system based on a standard laser and CCD camera, the PTR system provides possibility to record data at higher rate and the intense illumination gives possibility to use shorter exposure times. This in turn allows studies of time structures and time correlations on a shorter time scale.
Time variations down to a few ten microseconds time scale could be studied.
If 10 microsec cycles can be used, the jet speed might be measured with some per cents accuracy (for v=200m/s and dt=10 microsec), by studying suitable disturbances. ”If”, refers mainly to light yield and data-taking/handling capacity.
The laser beam must be orthogonal to the camera line of sight (for technical reasons), since a wide laser beam that covers the whole jet, requires the big windows.
DM = Detection Module. Integrated module with cameras and lasers fixed on a common plate, i.e. not individually as in this photo.
Time plan: Spring - Summer – assemble and prepare the setup in Uppsala. All h-w details are ready.
Summer service period w25 – install the PTR chamber at COSY.
Autumn – install the DMs and carry out tests.

3. PTR chamber and maybe cabling* together with installation of the dump.
Installation of the Pellet tracking system at the COSY beam region, in steps:
PTR chamber and maybe cabling* together with installation of the dump.
Two DMs with cameras and lasers just before a test with the cluster-jet.
The cluster-jet test vacuum chambers at COSY. Photo of the installed scattering chamber, April The PTR chamber will sit just below the COSY beam.
The PTR DM plates will stick out from the chamber mm in different directions.
Some space for mounting is also needed around the chamber.
Maybe need for some radiation shielding of the LS-cameras.
We have no experience of running the LS-cameras in a radiation environment.
It may be needed some radiation shielding of the cameras. One should be prepared for this (just in case ...)
*) Cabling:
CamLink cables 10 meter long between camera and W7 PC with frame grabber (FG) cards.
2) Power distribution box(es). At least one which is possible to switch on/off from Cosy eye.
3) Laser control USB cable 10 meter long between laser intensity control box (Moxa) and W7 PC.
DM = Detection Module. Integrated module with cameras and lasers fixed on a common plate (next slide).
PTR chamber sent from Uppsala 24/5.
Size = 30x30x30 cm
Total weight = 22 kg

4. For the cluster-jet setup, 1 camera and 1-2 lasers will be used.
Preparation and installation of the Pellet tracking system at COSY .
The DMs should be pre-aligned in a desktop setup and installed just before the test. Its alignment should then be checked and fine tuned with the cluster-jet after the installation.
The photo shows a DM with two cameras and three lasers in a desktop setup for alignment of the cameras and lasers. From left to right camera A, lasers B, C, A and camera B. The alignment target is normally placed at the cross in the center.
For the cluster-jet setup, 1 camera and 1-2 lasers will be used.
DM = Detection Module. Integrated module with cameras and lasers fixed on a common plate.
.From “Test of the Pellet TRacking (PTR) system in a Cluster-jet setup” (hc170428).

5. ”Uppsala CCD camera monitoring systems” A and B.
System-A with DMs mounted on the PTR chamber. In this case also a std CCD camera can be mounted opposite to the LS-camera (photo from UPTS).
System-B is w/o the LS-camera DMs. SNF-lasers and std CCD cameras are mounted in separate holders as it was on the WaC pellet pipe (left photo). A monitor image of 2.5 mm wide pellet stream in PTR chamber at UPTS (right photo).
System-A is based on line-scan (LS) cameras and part of the PTR project (for PANDA). It has very good prospects for detailed monitoring but is for the moment out of question for initial tuning of the cluster-jet, and this for many reasons.
System-B is based on standard CCD cameras and “tv”-monitors and it was used for pellet target tuning in WaC. It should be reasonably (very) easy to get into operation and hopefully work also for the cluster-jet target.
System-B will be used for the initial cluster-jet tests this summer.