HKS SiPM test

h1. Wiki

h3. List of equipement from Japan

# SiPM 3ch Box    Qty.4

# Special 30m LAN cable    Qty.4

# Raspberry Pi5     Qty.1

# 7 inch Monitor     Qty.1

# USB-LAN connector      Qty.1

# Standard LAN cable      Qty.2

# NIM EASIROC     Qty.1

# TTL-NIM-TTL 8ch module    Qty.1 (https://www.kagaku.com/hoshin/n002.html,  1ch TTLtoNIM, 4ch NIM-TTL will be used)

# 2ch Gate&Delay Module    Qty.2 (http://www.tcnland.co.jp/archives/product_type/gatedelaygenerator_n-tm_307,  4ch G&D will be used)

# 4ch logic fan I/O    Qty.1 (http://www.tcnland.co.jp/archives/product_type/fanin%EF%BC%8Ffanout_n-tm_102,  2ch will be used)

The SiPM is 3ch SiPM Box x 4 = 12 ch total. All SiPM can be handled by the adobe items.

For 8.~10., please arrange for spare modules in case the modules sent from Japan are defective. Equivalent products are fine.

We were unable to handle the detector well due to the effects of noise and crosstalk from TTL with standard cat.7 LAN cables or ECL Flat cables. We will provide a cable with an additional shield on the cat.7 cable.

h3. Old map of Hall A for previous SBS experiment

# https://userweb.jlab.org/~efuchey/SBS_BB/Pictures/GlobalPlanHallAFloor_lowBBangle.pdf

# https://redmine.jlab.org/documents/118

h3. How to operate new-firmware EASIROC and RaspberryPi

# Access to RaspberryPi

* IP address : 129.57.193.11

* Password : Please ask Ken

* Can access via JLab hall-gateway

* RasbberryPi controls EASIROC, edits EASIROC parameter files, saves aquired data by EASIROC, and outputs TTL signal for LED.

# Turn on LED in SiPM Boxes

* Each SiPM box has LED so that we can see 1p.e. level signal clearly.

* LEDs flash by sending TTL signal from RaspberryPi via BNC cable at 200Hz. This TTL signal is also used for DAQ trigger.

* Execute @python gpio_led.py@ to start sending TTL and turning on LED. While executing @gpio_led.py@, you can see TTL signal on oscilloscope ch1.

* Execute @python gpio_pedestal.py@ to take ADC pedestal data. While executing @gpio_pedestal.py@, you cannot see TTL signal on oscilloscope.

* LED emission intensity is very sensitive to width and amplitude of TTL signal. Ken has already adjusted it, so please don't touch NIM gate& delay generator and variable register. 

* You can edit @GPIO.py@ script and select @Pedestal mode@/ @LED mode@. In @Pedestal mode@, you will aquire only pedestal data (without 1p.e. signal), while in @LED mode@, you will aquire 1p.e. data. 

# Boot EASIROC 

* Confirm power supply to NIM crate, RaspberryPi is OK

* Once power is supplied to EASIROC correctly, LED1 at the bottom of EASIROC module turns red

* Main directory of EASIROC operation files on RaspberryPi

  @cd ~/EASIROC@ : main directory

  @Controller.rb@ : EASIROC controller script

  @GPIO.py@ : TTL signal for LED

  @yaml@ : EASIROC parameter files. @RegisterValue.yaml@ is the only parameter file we need to edit.

  @data@ : Data files (both .dat & .root). Once DAQ is completed, both rawdata(.dat) and decoded root file(.root) are output automatically in this directory. 

* Boot EASIROC (IP: @192.168.10.21@ )

  @./Controller.rb [IP address]@

# Command to operate EASIROC

* @./Controller.rb [IP address]@ will open interactive EASIROC controller.

* @help@ command will show available interactive commands

* Basic commands we will use are:

<pre>

 setHV [bias voltage] : Set SiPM HV as [bias voltage] value.

 statusHV : Show HV & current value on SiPMs.

 slowcontrol : Reflect changes on slow-controller setting (every time after you edit RegisterValue.yaml ).

 tdc on/off : TDC data taking ON/OFF. You can basically set as "ON".

 adc on/off : ADC data taking ON/OFF. You can basically set as "ON".

 scaler on/off : Scaler data taking ON/OFF. You can basically set as "ON".

 read [EventNumber] [Filename] : Start data taking. Data taking will go at 200Hz and EventNum around 10000-50000 looks fine. Filename is currently like "test000x.dat". 

</pre> 

* Caution0: EASIROC is ASIC module and is very weak for example against over-current caused by your wrong HV operation. Please be careful when you operate EASIROC not to break it, and please ask Ken if you have something unclear before doing it.  

* Caution1: When setting SiPM HV, you should increase SIPM HV gradually like 0V->20V->40V->50V->53V->54.5V. You can see 1p.e. signals from SiPM at 53V. If you cannot see the signals at 53V, you have some mistakes or troubles like HV line is not connected correctly. Also, be careful not to set  SiPM HV larger than 56V. Please check your input value every time you use @setHV@ command. HV will be enough at around 54.5V or 55.0V. Please check HV & current status frequently with @statusHV@ command.

* Caution2: Every time before disconnecting HV line or shutting down EASIROC, you should decrease SiPM HV gradually with @setHV@ command. Don't cut off HV suddenly.

* Caution3: Sometimes, EASIROC interactive mode may unexpectedly and suddenly closed while you are operating it. Basically, EASIROC is designed to decrease HV gradually in even such cases not to damage SiPM and EASIROC itself. So, you don't worry about it too much, but please let Ken know if some troubles happen.

# Edit EASIROC parameter file

* By editing @RegisterValue.yaml@, you can change some shaping parameter in EASIROC. However, only you need to change may be EASIROC channel you want to monitor signal with oscilloscope.

<pre>

HG Channle 1 : [channel number] : Output channel of HG Out 1 from the front panel of EASIROC module. HG Out 1 is set so that you can monitor Slow-sheper analog output from each channel.

Probe 1 : [channel number] : Output channel of Probe 1 from the front panel of EASIROC module. Probe 1 is set so that you can monitor Fast-sheper analog output from each channel.

</pre>

* For example, when checking signal of Box2, you can edit @RegisterValue.yaml@ as @HG Channle 1 : 4@ and @Probe 1 : 4@ to monitor fast/slow shaper analog signal from channel 4 (=MPPC4) with oscilloscope. Don't forget @slowcontrol@ command to reflect the change.

h3. Signal line & HV line connection 

* We have 4 SiPM boxes and 

!connection1.png!

h3. Check signals with oscilloscope

# How SiPM signals are processed inside EASIROC

* EASIROC is ASIC-based stand-alone DAQ module. It can amp.&shaping SiPM raw analog signal, and it extracts TDC, ADC, Scaler data inside itself(stand-alone). Already processed 64-bit(?) data is sent from EASIROC to RaspberryPi.

!signal1.png!

# 4ch oscilloscope  is assigned as followed:

<pre>

ch1: (50ohm impedance, 1V/div.) TTL signal from RaspberryPi -> use oscilloscope trigger

ch2: (1Mohm impedance, 50mV/div.) Fast-shaper analog output from EASIROC 

ch3: (1Mohm impedance, 50mV/div.) Slow-shaper analog output from EASIROC

ch4: (50ohm impedance, 1V/div.) Hold timing signal

As for orizontal scale, around 200ns/div will be good.  

</pre>

# Expected osciilloscope image w/o SiPM HV

!expected_oscilloscope.png!