**4.2.15 Target Hall Instrumentation**

Instrumentation of the target hall is described in this section. The
instrumentation consists of environmental sensors, beam synchronous
sensors and motion control devices. They are summarized according to the
three categories in **Table 4.2-17**, below. A detailed instrumentation
list is shown in **Table 4.2-18**.

Environmental sensors are used to measure temperature, humidity and
pressure in various locations of the hall and on some of the beam line
elements. These sensors are connected to either a PLC or an Analog Entry
Box (AEB). The PLC digitizes input signals and transmits this data to
ACNET via an Ethernet connection. The AEB transmits signals to an MADC,
where signals are digitized and transmitted to ACNET via CAMAC. In
parallel, the AEB transmits data to a Process Channel Interface (PCI)
with output signals to the Beam Permit. If any specified AEB input
signal falls outside the allowed range the PCI signal will drop Beam
Permit. At this time there are five Beam Permit inputs: three baffle
temperature sensors, one air supply temperature sensor and one air
supply fan differential pressure sensor. A block diagram of the signal
paths is shown in **Figure 4.2-1**.

Beam-synchronous sensors are used to measure the horn current pulse, the
horn magnet fields (with "Bdot" pickup coils), beam on target (Budal
monitor) and residual radiation into the Beam Loss Monitors (BLMs). The
BLMs will be used with low-intensity beams to locate the optimal beam
path through the horns. They may also be used for beam timing
measurements. All signals from beam-synchronous sensors are connected to
AEB inputs.

Note: The timing of the beam as derived from Budal or BLM signals will
be compared to the timing of the pulsed horn, as derived from the B-dot
detectors or the transducer output from the horn power supply system. In
the event the relative timing changes significantly (\>1% field decrease
from maximum) an ACNET alarm will be set. This translates to a
133-microsecond window of coincidence (beam starts 76.5 μsec before
maximal horn current or beam starts 66.5 msec after maximal horn
current: 143-μsec window).

Horn 1 and the baffle/target positions are adjustable via motor
controls. All motors are located on top of the modules, shielded from
the primary radiation. Vertical and horizontal angle and position will
be adjustable for horn 1 and target/baffle. In addition, target/baffle
has 100 inches of longitudinal motion (along the beamline) to facilitate
changes to the neutrino beam energy. Limit switches, including those for
longitudinal motion, are placed on top of the modules. Position readback
will be obtained with precision LVDTs, also located on top of the
modules. Motion parameters are summarized in **Table 4.2-19**. ACNET is
used for motion control via ethernet-VME-ACS communication, as shown in
**Figure 4.2-2**.

Note: Motion of the target/baffle must be interlocked so that it is not
possible for the target to collide with the horn.

**Table 4.2-17**. Instrumentation Summary

  --------------------- ------------ --------- -- ---------- ----------------- -------------- -- ------------- ----------
  **ENVIRONMENT**                                            **Synchronous     **Input**         **MOTION      
                                                             with Beam**                         Controls**    

  Readout frequency\~   **Input                   Measured                     **Channels**      **and         **ACS**
  0.1Hz                 Channels**                during                                         Readback**    
                                                  beam spill                                                   

                        **AEB**      **PLC**                                   **AEB**                         

  **Temperature**                                            **Budal Monitor**                   **Motor       Quantity
                                                                                                 Control**     

  [Baffle: also to Beam 3                                    Target (x, y)     2                 Tgt mod;      4
  Permit]{.underline}                                                                            trans & angle 

  Baffle/Target Carrier              2                       **Total**         **2**             Tgt/baffle    1
                                                                                                 motion in Z   

  Horn #1 Module                     4                                                           Hrn #1 mod    4
  support                                                                                        trans&angle   

  Horn #1 Carriage                   2                       **Bdot**                            **Total**     **9**

  Horn #1 Body                       6                       Hrn #1 Field      3                               

  Horn #2 Module                     4                       Hrn #2 Field      3                               
  support                                                                                                      

  Horn #2 Body                       6                                                                         

  Target pile shielding              6                       **Total**         **6**                           

  Air Temp(pile         1            2                                                                         
  supply/return)                                                                                               

  Fan Temp                           2                                                           **LVDT**      
  (inlet/outlet)                                                                                               

  **Total**             **4**        **34**                                                      Tgt mod;      4
                                                                                                 trans & angle 

                                                             **Horn Currents**                   Hrn #1 mod    4
                                                                                                 trans&angle   

  **Pressure**                                               Striplines        4                 Tgt/baffle    1
                                                                                                 motion in Z   

  Filter bank in/out                 2                       Sum of striplines 1                 **Total**     **9**
  differential                                                                                                 

  [Fan i/o diff ; Beam  1            1                       **Total**         **5**                           
  Permit]{.underline}                                                                                          

  Evaporator coil                    1                                                                         

  **Total**             **1**        **4**                                                                     

                                                                                                               

  **Target Pressure**                                        **Beam Loss                         **Limit       
                                                             Monitor**                           Switch        
                                                                                                 Circuits**    

  Pirani Vacuum Gauge   1                                    Horn 1            1                 Tgt module    10

  He Pressure Gauge     1                                    Horn 2            1                 Hrn #1 module 8

  **Total**             **2**                                **Total**         **2**             **Total**     **18**

                                                                                                 (Note: Limit  
                                                                                                 switches      

  **Humidity**                                                                                   may be        
                                                                                                 doubled up    
                                                                                                 for           

  Air (supply/return) &              3                       **Timing**                          redundancy)   
  Tgt hall                                                                                                     

  **Total**                          **3**                   Bdot & Budal,     1                               
                                                             possibly more                                     

                                                             Budal, Stripline  0                 **Interlock   **1**
                                                             Current                             switch**      

  **Other**                                                  **Total**         **1**             or more       

  Fan Current                        1                                                                         

  Target - Ground       1                                                                                      
  Impedance                                                                                                    

  **Total**             **1**        **1**                                                                     

                                                                                                               

  **Subtotal: Channel   **7**        **42**                  **Subtotal:       **16**                          
  Count**                                                    Channel Count**                                   
  --------------------- ------------ --------- -- ---------- ----------------- -------------- -- ------------- ----------

**Table 4.2-18** Detailed List of Instrumentation

  --------------- --------------- --------------- ---- ------------ ----------- ----------- ----------- --------------
                  11/13/2002                      \#   **Detail**   **ACNET**   **Range**   **Error**   **ACNET**
                  Draft: R.L.T.                                                                         

                                                                    **Alarm**                           **Readout/**

  **Component**   **Quantity**    **Device**                                                            **Control**

                                                                                                        

  **Target Pile** Pre-filter,     Pressure        2                 **A**       3\"         0.25%       PLC/ethern
                  High-eff.       differential                                                          
                  filter                                                                                

                  Fan in/out      Pressure        1    **Permit**   **A**       13\"        0.25%       AEB
                                  differential                                                          

                  Fan in/out      Pressure        1                 **A**       13\"        0.25%       PLC/ethern
                                  differential                                                          

                  Humidity,       Rel Humidity    2                             100%                    PLC/ethern
                  Supply/Return   Transmitter                                                           

                  Humidity,       Rel Humidity    1                             100%                    PLC/ethern
                  Target Hall     Transmitter                                                           

                  Evaporator coil Pressure        1                                                     PLC/ethern

                  Fan Curent      Transducer      1                             100%                    PLC/ethern

                  Pit             Thermocouple    6                 **A**       50˚C        1˚C         PLC/ethern
                  Temperatures                                                                          

                  Air Temp        Thermocouple    1    **Permit**   **A**       50˚C        1˚C         AEB
                  (supply to pile                                                                       
                  )                                                                                     

                  Air Temp        RTD             1                 **A**       30˚C        0.25˚C      PLC/ethern
                  (supply to pile                                                                       
                  )                                                                                     

                  Air Temp        RTD             1                 **A**       30˚C        0.25˚C      
                  (return from                                                                          
                  pile)                                                                                 

                  Fan Inlet       RTD             1                 **A**       30˚C        0.25˚C      PLC/ethern
                  Temperature                                                                           

                  Fan Discharge   RTD             1                 **A**       30˚C        0.25˚C      PLC/ethern
                  Temp                                                                                  

                                                                                                        

  **Baffle**      Temperature     Thermocouple    3    **Permit**   **A**       50˚C        1˚C         AEB
                                  (2 + 1 spare)                                                         

                                                                                                        

  **Target**      Beam on target  Budal Monitor;  2    1X, 1Y                                           AEB
                                  current                                                               

                  Target-ground   To be decided   1                 **A**                               AEB
                  impedance                                                                             

                  Vacuum          Pirani Gauge    1                 **A**                               AEB

                  He Pressure     Pressure Gauge  1                 **A**                               AEB

                                                                                                        

  **Tgt/Bffl      Temperature     Thermocouple    2                 **A**       50˚C        1˚C         PLC/ethern
  Carrier**                                                                                             

                                                                                                        

  **Target**      Space Frame     Motor Control   4    2X, 2Y                   \*          \*          ACS
                  angle                                                                                 

  **Module**      and transverse  LVDT (pos\'n    4    2X, 2Y                   \*          \*          ACS
                  motion          readback)                                                             

                                  Limit Switch    8                             \*          \*          ACS
                                  Circuits                                                              

                  Target Motion - Motor Control   1    Z only                   \*          \*          ACS
                  Z axis                                                                                

                                  Scaled-motion   1                             \*          \*          ACS
                                  LVDT                                                                  

                                  Z-Limit Switch  2                             \*          \*          ACS
                                  Circuits                                                              

                  Motion          Limit Switch    1                                                     
                  Interlock                                                                             

                                                                                \*          \*          

  **Horn 1        Horn angle and  Motor Control   4    2X,2Y                    \*          \*          ACS
  Module**                                                                                              

                  Transverse      LVDT (pos\'n    4    2X,2Y                    \*          \*          ACS
                  Motion          readback)                                                             

                                  Limit Switch    8                             \*          \*          ACS
                                  Circuits                                                              

                  Support         Thermocouple    4                 **A**       50˚C        1˚C         PLC/ethern
                  temperature                                                                           

                  Carriage        Thermocouple    2                 **A**       50˚C        1˚C         PLC/ethern
                  temperature                                                                           

  Shielding Block Horn alignment  Beam loss       1                                                     AEB
                                  monitor                                                               

                                                                                                        

  **Horn 2        Suport          Thermocouple    4                 **A**       50˚C        1˚C         PLC/ethern
  Module**        temperature                                                                           

  Shielding Block Horn Aligment   Beam loss       1                                                     AEB
                                  monitor                                                               

                                                                                                        

  **Horn 1**      Magnetic Field  Bdot coil       3                 **A\'**                 0.40%       AEB

                  Temperature     Thermocouple    6                 **A**       50˚C        1˚C         PLC/ethern

                                                                                                        

  **Horn 2**      Magnetic Field  Bdot coil       3                 **A\'**                 0.40%       AEB

                  Temperature     Thermocouple    6                 **A**       50˚C        1˚C         PLC/ethern

                                                                                                        

  **Power         Stripline       Summing Module  4                                                     AEB
  Supply**        Currents                                                                              

                  Total Current   Summing Module  1                                                     AEB

                                                                                                        

                                                                                                        

  **Timing**      Horn Current/   Bdot coil &     1                 **A\'**     200 us      10 us       AEB
                  Beam Spill      Budal Monitor                                                         

                  or              BLM &Stripline                                200 us      10 us       AEB
                                  current, etc                                                          
  --------------- --------------- --------------- ---- ------------ ----------- ----------- ----------- --------------

**Table 4.2-19** Motion Control

a)  to ACNET via AEB & MADC

b)  to Beam Permit via PCI

c)  to ACNET via the PLC

![](media/image1.wmf){width="6.5in" height="3.8333333333333335in"}

**Figure 4.2-****47** Instrumentation Readout Paths

![](media/image2.wmf){width="6.5in" height="3.8055555555555554in"}

**Figure 4.2-****48** Instrumentation Readout Paths Motor Controls