1. Pixel Ladder QA manual Setup Testing Disassembly R. Akimoto, A. Shaver. July 2010

2. Check List 1 Interlock – Temperature of NOVEC Check if the difference from the value in the RIKEN QA is less than 5° C – Humidity inside test box Check if the difference from the value in the RIKEN QA is less than 5% Relative Humidity (R.H.) Power supply – Voltage and current of the power supply for the SPIRO and LADDER are at the operational values. SPIRO: Check that the difference of the current from the value of the same SPIRO is less than.1 A LADDER: Check the difference of the current from the value in the RIKEN QA is less than.1 A – Bias voltage and leakage current at 5 V increments Check the difference in the leakage current from the value in the RIKEN QA is less than.3 μA 2

3. Check List 2 DAC value – SPIRO S/N Confirm that the SPD FEM is reading the correct S/N value – Reference voltage (DAC_REF_VDD, DAC_MID, and GTL_REF) Check the difference from the value of the same SPIRO is less than 2 – Threshold value for each chip Check the difference from the value in the RIKEN QA is less than 10 – Mask pixel Check if there are differences from the results in the RIKEN QA β source testing Check the difference in the dead area against the RIKEN QA 3

4. SETUP FOR QA TESTING 4

5. Connected SPIRO board (with test adapter) 5

6. (Left) Ladder connection and Setup 6

7. Supporting the Ladder fixture We used this book to support ladders coming out of and going into the test box. 7

8. Supporting the Ladder in fixture with Hex (Allen) wrench Note the position of the wrench supporting the stave

9. Useful Tools Minor divisions are ~ 1mm Plastic-Sheathed Eyeglass Screwdriver: Safely lifts data connection from ladder 5/64” Hex (Allen) Wrench: Supports Ladder for NOVEC tube attachment/detachment 9

10. Test Box Setup 1 Setup procedures must be done very carefully 1.Remove the top cover and bottom acrylic plate – It is helpful to place across the test box something to support the stave above the box until you’re ready to lower the stave into the box. This is also useful during disassembly (See book in the previous slide) 2.Attach tubes for NOVEC – Silicon grease is used to smoothly attach and detach the tubes. It is applied to the inside of the tubes – Use a ~ 5/64” or 2 mm hex (Allen) wrench to support the Ladder in its fixture (see picture) – Secure the tube to the white plastic attachment point underneath the ladder Be gentle in this connection, but make sure that the connection is well made. 3.Attach power connections – Attach the Red 3.5 VDD leads from the Ladder to the VDD connection on the bus – Attach the Black GND leads from the Ladder to the GND connection on the bus – Attach the (white taped) Bias leads from the bus to the Bias connection on the Ladder. – Each of the leads can fit into multiple positions within the associated connection. The specific position within the connector doesn’t matter. 10

11. Test Box Setup 2 4.Attach Data connections – Use canned/compressed air to blow out dust on the connectors Block or otherwise direct the air such that it doesn’t blow across the sensor chips (so dust doesn’t land on them) – Line up the connectors on the Bus and Ladder – Be Careful! When properly aligned, firmly press the connectors together. There may be some feeling of connectors snapping together. Make sure a good connection is formed, but remember that these parts are very fragile! 5.Lower the ladder into the test box. – Consider holding the corners of the aluminum ladder support and lowering straight down. 6.Close up the box, flow dry N 2 and begin Interlock sequence 11

12. Ladder Connections 12 Data Connectors

13. Bus Connections Data Connection (Under-side) Power connections Top Left: GND (ground) Bottom Left: VDD (Ladder 3.5V) Right: Bias (0-50V) 13 Bus Under-side

14. Interlock System Before powering the Ladder and Bias, you must pass Interlock system checks. The interlock system will check the humidity inside the test bench, the NOVEC temperature, and the NOVEC flow rate. It also includes valve control and monitoring for the NOVEC flow. Colors correspond to the diagram on the following slide 1.Turn on the Power to the Interlock System. 2.With the N 2 flow, the humidity in the box should be decreasing. – When the ladder is chilled we need to prevent condensation, so the humidity must be sufficiently low 3.After the humidity reaches its threshold, 0% Relative Humidity (R.H.) and the check is passed, start the pump and refrigeration. – When a check is passed, the LED on the Interlock will change from red to green. – For each check you must confirm that the LED has changed. 4.Open the valves on the chiller and open the valve on the Interlock Control; Turn on pumps and refrigeration. – Confirm that the interlock system is measuring a flow by its associated LED 5.When the temperature reaches the threshold temperature (17.5° C for testing) begin to power-up the low voltage equipment 14

15. Interlock system Valve control: Open Close Interlock power Relative Humidity: measured threshhold Temperature reading (here, of the NOVEC, as no temp. sensor is on the staff) System Checks: green light indicates check passed, red light indicates check failed Valve, Output, Humidity, Temp, Flow Humidity sensor reading 15

16. Chiller Chiller power To Start/Stop pump and refrigeration: First press Pump Then press Run/Stop

17. Low Voltage After interlock checks are all passed (LEDs are green) begin powering voltages to SPIRO board, chips (Ladder / VDD), and silicon (Bias) in that order 1.SPIRO: Turn on power supply, output 5 V to the SPIRO board – Should be 5V, and approximately 1.8 A 2.VDD: 1.Turn on power supply, confirm that the minimum voltage is set 2.Output the minimum voltage to the VDD 3.At a rate of approximately.1 [V/sec], increase the voltage to 3.5 V The current may rise steeply between approximately 1.5 V and 3V Do not allow the current to exceed 5 A If the current is quickly approaching 5 A, pause for a moment (~5 sec), and the system will equilibrate somewhat, and then continue at a slower pace. The current will be approximately 4.4-4.6A when the voltage reaches 3.5 V 3.Bias: 1.There are some modules which cannot operate with the bias voltage of 50 V due to large leakage current or a continuously increasing leakage current. You must check the proper operational bias voltage before supplying voltage. 2.Turn up the voltage slowly (approx. the same rate as above) from 0 V to 50 V 3.If the current is anomalously large compared to the value from the RIKEN QA test, it may indicate some problem. 17

18. Low Voltage Setup Right Half-LadderLeft Half-Ladder SPIRO Power Supplies RHL VDD Power Supply LHL VDD Power Supply 18

19. QA TESTING 19

20. Data acquisition Data is sent from the SPIRO boards to the FEM via optical fibers and read from the FEM through a USB cable. Ops system is used for data acquisition. User name and password of DAQ PC is -User name : pixel -Password : pixel*3186 20

21. 1. Select USB mode. 2. Check the HS channels which you are using. 3. Push “RST” button. 4. Push “GO” button. 1 3 2 4 21

22. Set proper values for taking data at some registers. -ADDR=0x4, 0x14, 0x24 : select the chips where FastOR signals (self trigger signal) are accepted. ✓ If you use readout channel of 0-3 and accept all FastOR signal from them, you have to set 0x4, 0x14=0xff and 0x24=0x0. ✓ DATA Hex: Consider all chips a series of binary digits. Convert that binary value to hex. (e.g. Selecting the First, Third – Fifth, and Eighth chips: 10011101=0x9d; select no chips: 0x00, select all chips: 0xff) -ADDR=0x60, 0x61 : set the maximum trigger rate ✓ 0x60=0x20 and 0x61=0x0 means the maximum rate is 32Hz -ADDR=0x62, 0x63 : set trigger mode. (external trigger mode or self trigger mode) ✓ External trigger mode : 0x62=0x0 and 0x63=0x0 ✓ Self trigger mode : 0x62=0x1 and 0x63=0x1 (Ladder QA is carried out in self trigger mode.) 22

23. Set DAC values (DAC_VDD, DAC_MID, GLT_REF) of analog pilot. -Set the HS channel which you intend to set DAC values via “HS Channel Number” panel and set proper DAC values via “Set Analog Pilot DACS” panel. -The DAC values are optimized so that the reference voltage be proper values. ✓ The proper reference voltages are DAC_REF_VDD=1.8V, DAC_REF_MID=0.955V, GTL_REF=0.8V Following slide shows measurement locations ✓ The reference voltage can be measured at tester adapters. -The above values are stored for each SPIRO board in a spreadsheet. The FEM should read off the proper S/N automatically, but you should confirm that the S/N matches each time you power up the FEM. 23

24. SPIRO tester board guide 24 3 1 GTL

25. SPIRO tester board guide 25 3 1 GTL Fast-OR A3 A2 A1 A0 e.g. A2=Bus A, Chip 2 GTL_REF A Bus B Bus A DAC_REF_VDD A DAC_REF_MID A Fast-OR B3 B2 B1 B0 GTL_REF B DAC_REF_MID B DAC_REF_VDD B

26. Set trigger latency Set threshold values for each chip Set mask and test bits 26

27. Set threshold values Threshold values have to be optimized. -You can this optimization by checking FastOR signals which are triggered by noise. FastOR signal can be checked via tester adapters. -Setting larger number means setting lower threshold. -You can find the pixels which have to be masked. The pixels whose threshold is higher than the other pixel at the same chip have to be masked. 27

28. Set mask and test bits 1. Select the chip which has the pixel(s) you want to mask (send test pulse). 2. Select the pixel position. 3. Set mask (test) bit(s). - ALL : Set all the pixels in the chip. - COL : Set all the pixels in the column. - BIT : Set the pixel in the column and the row. 4. You can save and read the bit information. 1 3 2 4 28

29. Two dimensional hit map for each chip is shown Take data with external or self trigger Take data with force trigger (Automatic Pulse Test) Convert data to an EXCEL file 29

30. DAQ rate is shown Start data taking with external or self trigger Stop data taking - Write file: Writes data to a file - Graph Display: Displays a hit map. If you display a hit map, DAQ rate decrease. It is better not to display when you intend to store data for analysis. Clear hit maps This button will begin an Automatic Pulse Test. This takes data with a forced trigger. 30

31. DISASSEMBLY 31

32. Disassembly notes 1 In general, proceed through the assembly procedures in reverse Power-Down – Gradually decrease Bias voltage at approximately.1 [V/sec] – Turn off output of Bias power supplies, and power-off Bias power supplies. – Decrease VDD voltage at ~.1 [V/sec], turn off power supply output, and power-off VDD power supplies – Turn off SPIRO power supply output, and power-off SPIRO power supplies Thermalize – Turn off pump and refrigeration – Close the valves on the chiller and close the valve on the Interlock system – Wait until the temperature reading rises to the 17.5° C threshold to prevent condensation when you open the test box 32

33. Disassembly notes 2 Open the test box, lift out the Ladder and support it Carefully disconnect the NOVEC tubes: – Use the Hex(Allen) wrench to support the ladder in its fixture again. – Twisting back and forth, slowly pull off the NOVEC tube Using a plastic sheathed eyeglass screwdriver (as pictured in the useful tools slide #9),slide the screwdriver end between the two connections on the data connector and carefully pry the bus data connection off the ladder. – See following picture – Plastic sheathing is important to prevent damage to the ladder or bus. Disconnect the VDD and GND wires from the bus; Disconnect the Bias from the Ladder. Tilt the ladder to drain the remaining NOVEC Return Ladder fixture to case and secure the case. 33

34. Removing Data Connector

35. APPENDIX 35

36. Bus and SPIRO connection It is convenient to just keep the bus connected to a SPIRO board throughout QA testing procedure, but if you need to attach/detach: Attaching the Bus to the SPIRO – Line up the bus connection to the SPIRO or SPIRO test board, and press together – NOTE: these are pinned connections, be very careful about bending pins on the SPIRO connection. The connection should go on fairly smoothly without excessive resistance Detaching the bus and SPIRO – Rock the connection back and forth while gently pulling the bus off of the SPIRO board 36

37. Spiro connection on Bus

38. Bus connection on SPIRO Test Boards