1. Nikhef/Bonn LepCol meeting
June 2017 testbeam in Bonn
Fred Hartjes
NIKHEF
Nikhef/Bonn LepCol meeting
May 8, 2017

2. Questions Beam parameters? Beam control What do we want to measure?
Kind: electrons
Energy: ** GeV??
Minimum rate: 20 kHz??
Profile: ** x ** mm??
Time structure?
Beam control
Are we main user on June 8 and 9?
How much time to interrupt the beam?
Minimum number of people required while running?
What do we want to measure?
Which track angles ??
Which rates ??
How many tracks per run?

3. Time schedule Preparatory visit to beam area Installation start
Friday May 12, noon – 16:00
Installation start
????
Installation end
???? (we need at least 8 hours)
Data taking start
Thursday, June 8, 12:00
Data taking end
Saturday, June 10, 8:00

4. Organisation Who will go from Nikhef? Who will attend from Bonn?
Fred
Harry?
Kees?
Kevin
…….?
Who will attend from Bonn?
Jochem?
……..?
Transport of equipment
One car will be sufficient
Safety issues
Dosimeter
Safety course / instructions?
Organisation

5. Overall setup Support for detector
Platform/table to put things on
X-Z stage
Manual or remote?
Rotary stage
Using remote stage of Harry?
Support for Xylinx board and stiff ribbon cables
Office table for 2 PCs (DAQ + services)

6. Setup in beam area Gas system
Bottle premixed at Nikhef
bar
T2K (iC4H10/CO2/Ar 2/3/95) non flammable
Installed in the vicinity of the detector
In leak tray (may not needed)
Pipes: 1/8”, almost completely SS
Flow ~ 5 ml/min
Regulated / measured by mass flow controller / meter
Controlled by Labview
Already used at CERN (5X) and DESY (2X) (for flammable DME/CO2)
Approved by CERN/DESY gas safety officers

7. High voltage Using Nikhef miniHVs Range: 0 to -1000 V Current 0 – 5 µA
Grid
Guard
Field
Range: 0 to V
Current 0 – 5 µA
Stability ~0.1 nA
Sophisticated ramping and trip protection
Controlled/supplied by CAN bus
Ethernet cables for data transport and power supply
SHV cables to detector
Controlled by Labview

8. DAQ Triggering Event synchronisation with existing telescope
Scintillators from Bonn?
NIM electronics
Dead time blocking
Event synchronisation with existing telescope
Data is collected on two different machines
No good agreement in registered time
Synchronizing by single pulse at start data taking?
Other/better solutions?
Gain calibration
Best: use value obtained with laser setup (single electron hits on pixels)
Use same gas bottle
Make correction for atmospheric pressure and temperature